[OLINGO-713] Proposal Tutorial - System Query Option $filter
This commit is contained in:
Christian Holzer
parent
74fe42e54e
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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>my.group.id</groupId>
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<artifactId>DemoService-QueryOptions-F</artifactId>
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<packaging>war</packaging>
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<version>0.0.1</version>
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<name>${project.artifactId} Webapp</name>
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<build>
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<finalName>DemoService</finalName>
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</build>
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<properties>
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<javax.version>2.5</javax.version>
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<odata.version>4.0.0-beta-03</odata.version>
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<slf4j.version>1.7.7</slf4j.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>servlet-api</artifactId>
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<version>${javax.version}</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.olingo</groupId>
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<artifactId>odata-server-api</artifactId>
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<version>${odata.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.olingo</groupId>
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<artifactId>odata-server-core</artifactId>
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<version>${odata.version}</version>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.olingo</groupId>
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<artifactId>odata-commons-api</artifactId>
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<version>${odata.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.olingo</groupId>
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<artifactId>odata-commons-core</artifactId>
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<version>${odata.version}</version>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-simple</artifactId>
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<version>${slf4j.version}</version>
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<scope>runtime</scope>
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</dependency>
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</dependencies>
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</project>
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@ -0,0 +1,125 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package myservice.mynamespace.data;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Locale;
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import myservice.mynamespace.service.DemoEdmProvider;
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import myservice.mynamespace.util.Util;
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import org.apache.olingo.commons.api.data.Entity;
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import org.apache.olingo.commons.api.data.EntityCollection;
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import org.apache.olingo.commons.api.data.Property;
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import org.apache.olingo.commons.api.data.ValueType;
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import org.apache.olingo.commons.api.edm.EdmEntitySet;
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import org.apache.olingo.commons.api.edm.EdmEntityType;
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import org.apache.olingo.commons.api.http.HttpStatusCode;
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import org.apache.olingo.server.api.ODataApplicationException;
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import org.apache.olingo.server.api.uri.UriParameter;
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public class Storage {
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private List<Entity> productList;
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public Storage() {
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productList = new ArrayList<Entity>();
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initSampleData();
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}
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/* PUBLIC FACADE */
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public EntityCollection readEntitySetData(EdmEntitySet edmEntitySet)throws ODataApplicationException{
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// actually, this is only required if we have more than one Entity Sets
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if(edmEntitySet.getName().equals(DemoEdmProvider.ES_PRODUCTS_NAME)){
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return getProducts();
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}
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return null;
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}
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public Entity readEntityData(EdmEntitySet edmEntitySet, List<UriParameter> keyParams) throws ODataApplicationException{
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EdmEntityType edmEntityType = edmEntitySet.getEntityType();
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// actually, this is only required if we have more than one Entity Type
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if(edmEntityType.getName().equals(DemoEdmProvider.ET_PRODUCT_NAME)){
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return getProduct(edmEntityType, keyParams);
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}
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return null;
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}
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/* INTERNAL */
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private EntityCollection getProducts(){
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EntityCollection retEntitySet = new EntityCollection();
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for(Entity productEntity : this.productList){
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retEntitySet.getEntities().add(productEntity);
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}
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return retEntitySet;
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}
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private Entity getProduct(EdmEntityType edmEntityType, List<UriParameter> keyParams) throws ODataApplicationException{
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// the list of entities at runtime
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EntityCollection entitySet = getProducts();
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/* generic approach to find the requested entity */
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Entity requestedEntity = Util.findEntity(edmEntityType, entitySet, keyParams);
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if(requestedEntity == null){
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// this variable is null if our data doesn't contain an entity for the requested key
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// Throw suitable exception
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throw new ODataApplicationException("Entity for requested key doesn't exist",
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HttpStatusCode.NOT_FOUND.getStatusCode(), Locale.ENGLISH);
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}
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return requestedEntity;
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}
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/* HELPER */
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private void initSampleData(){
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// add some sample product entities
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productList.add(new Entity()
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.addProperty(new Property(null, "ID", ValueType.PRIMITIVE, 1))
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.addProperty(new Property(null, "Name", ValueType.PRIMITIVE, "Notebook Basic 15"))
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.addProperty(new Property(null, "Description", ValueType.PRIMITIVE, "Notebook Basic, 1.7GHz - 15 XGA - 1024MB DDR2 SDRAM - 40GB")));
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productList.add(new Entity()
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.addProperty(new Property(null, "ID", ValueType.PRIMITIVE, 2))
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.addProperty(new Property(null, "Name", ValueType.PRIMITIVE, "1UMTS PDA"))
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.addProperty(new Property(null, "Description", ValueType.PRIMITIVE, "Ultrafast 3G UMTS/HSDPA Pocket PC, supports GSM network")));
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productList.add(new Entity()
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.addProperty(new Property(null, "ID", ValueType.PRIMITIVE, 3))
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.addProperty(new Property(null, "Name", ValueType.PRIMITIVE, "Ergo Screen"))
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.addProperty(new Property(null, "Description", ValueType.PRIMITIVE, "19 Optimum Resolution 1024 x 768 @ 85Hz, resolution 1280 x 960")));
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}
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}
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@ -0,0 +1,153 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package myservice.mynamespace.service;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import org.apache.olingo.commons.api.ODataException;
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import org.apache.olingo.commons.api.edm.EdmPrimitiveTypeKind;
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import org.apache.olingo.commons.api.edm.FullQualifiedName;
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import org.apache.olingo.commons.api.edm.provider.CsdlAbstractEdmProvider;
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import org.apache.olingo.commons.api.edm.provider.CsdlEntityContainer;
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import org.apache.olingo.commons.api.edm.provider.CsdlEntityContainerInfo;
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import org.apache.olingo.commons.api.edm.provider.CsdlEntitySet;
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import org.apache.olingo.commons.api.edm.provider.CsdlEntityType;
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import org.apache.olingo.commons.api.edm.provider.CsdlProperty;
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import org.apache.olingo.commons.api.edm.provider.CsdlPropertyRef;
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import org.apache.olingo.commons.api.edm.provider.CsdlSchema;
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public class DemoEdmProvider extends CsdlAbstractEdmProvider {
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// Service Namespace
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public static final String NAMESPACE = "OData.Demo";
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// EDM Container
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public static final String CONTAINER_NAME = "Container";
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public static final FullQualifiedName CONTAINER = new FullQualifiedName(NAMESPACE, CONTAINER_NAME);
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// Entity Types Names
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public static final String ET_PRODUCT_NAME = "Product";
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public static final FullQualifiedName ET_PRODUCT_FQN = new FullQualifiedName(NAMESPACE, ET_PRODUCT_NAME);
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// Entity Set Names
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public static final String ES_PRODUCTS_NAME = "Products";
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@Override
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public CsdlEntityType getEntityType(FullQualifiedName entityTypeName)
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throws ODataException {
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// this method is called for one of the EntityTypes that are configured in the Schema
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if(ET_PRODUCT_FQN.equals(entityTypeName)){
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//create EntityType properties
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CsdlProperty id = new CsdlProperty().setName("ID").setType(EdmPrimitiveTypeKind.Int32.getFullQualifiedName());
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CsdlProperty name = new CsdlProperty().setName("Name").setType(EdmPrimitiveTypeKind.String.getFullQualifiedName());
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CsdlProperty description = new CsdlProperty().setName("Description").setType(EdmPrimitiveTypeKind.String.getFullQualifiedName());
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// create PropertyRef for Key element
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CsdlPropertyRef propertyRef = new CsdlPropertyRef();
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propertyRef.setName("ID");
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// configure EntityType
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CsdlEntityType entityType = new CsdlEntityType();
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entityType.setName(ET_PRODUCT_NAME);
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entityType.setProperties(Arrays.asList(id, name, description));
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entityType.setKey(Collections.singletonList(propertyRef));
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return entityType;
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}
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return null;
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}
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@Override
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public CsdlEntitySet getEntitySet(FullQualifiedName entityContainer,
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String entitySetName) throws ODataException {
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if(entityContainer.equals(CONTAINER)){
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if(entitySetName.equals(ES_PRODUCTS_NAME)){
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CsdlEntitySet entitySet = new CsdlEntitySet();
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entitySet.setName(ES_PRODUCTS_NAME);
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entitySet.setType(ET_PRODUCT_FQN);
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return entitySet;
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}
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}
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return null;
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}
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@Override
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public CsdlEntityContainerInfo getEntityContainerInfo(
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FullQualifiedName entityContainerName) throws ODataException {
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// This method is invoked when displaying the service document at e.g. http://localhost:8080/DemoService/DemoService.svc
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if(entityContainerName == null || entityContainerName.equals(CONTAINER)){
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CsdlEntityContainerInfo entityContainerInfo = new CsdlEntityContainerInfo();
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entityContainerInfo.setContainerName(CONTAINER);
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return entityContainerInfo;
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}
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return null;
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}
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@Override
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public List<CsdlSchema> getSchemas() throws ODataException {
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// create Schema
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CsdlSchema schema = new CsdlSchema();
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schema.setNamespace(NAMESPACE);
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// add EntityTypes
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List<CsdlEntityType> entityTypes = new ArrayList<CsdlEntityType>();
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entityTypes.add(getEntityType(ET_PRODUCT_FQN));
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schema.setEntityTypes(entityTypes);
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// add EntityContainer
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schema.setEntityContainer(getEntityContainer());
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// finally
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List<CsdlSchema> schemas = new ArrayList<CsdlSchema>();
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schemas.add(schema);
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return schemas;
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}
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@Override
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public CsdlEntityContainer getEntityContainer() throws ODataException {
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// create EntitySets
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List<CsdlEntitySet> entitySets = new ArrayList<CsdlEntitySet>();
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entitySets.add(getEntitySet(CONTAINER, ES_PRODUCTS_NAME));
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// create EntityContainer
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CsdlEntityContainer entityContainer = new CsdlEntityContainer();
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entityContainer.setName(CONTAINER_NAME);
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entityContainer.setEntitySets(entitySets);
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return entityContainer;
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}
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}
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@ -0,0 +1,134 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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||||||
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* or more contributor license agreements. See the NOTICE file
|
||||||
|
* distributed with this work for additional information
|
||||||
|
* regarding copyright ownership. The ASF licenses this file
|
||||||
|
* to you under the Apache License, Version 2.0 (the
|
||||||
|
* "License"); you may not use this file except in compliance
|
||||||
|
* with the License. You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
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*
|
||||||
|
* Unless required by applicable law or agreed to in writing,
|
||||||
|
* software distributed under the License is distributed on an
|
||||||
|
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
||||||
|
* KIND, either express or implied. See the License for the
|
||||||
|
* specific language governing permissions and limitations
|
||||||
|
* under the License.
|
||||||
|
*/
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package myservice.mynamespace.service;
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import java.io.InputStream;
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||||||
|
import java.util.Iterator;
|
||||||
|
import java.util.List;
|
||||||
|
import java.util.Locale;
|
||||||
|
|
||||||
|
import myservice.mynamespace.data.Storage;
|
||||||
|
|
||||||
|
import org.apache.olingo.commons.api.data.ContextURL;
|
||||||
|
import org.apache.olingo.commons.api.data.Entity;
|
||||||
|
import org.apache.olingo.commons.api.data.EntityCollection;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmEntitySet;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmEntityType;
|
||||||
|
import org.apache.olingo.commons.api.format.ContentType;
|
||||||
|
import org.apache.olingo.commons.api.format.ODataFormat;
|
||||||
|
import org.apache.olingo.commons.api.http.HttpHeader;
|
||||||
|
import org.apache.olingo.commons.api.http.HttpStatusCode;
|
||||||
|
import org.apache.olingo.server.api.OData;
|
||||||
|
import org.apache.olingo.server.api.ODataApplicationException;
|
||||||
|
import org.apache.olingo.server.api.ODataRequest;
|
||||||
|
import org.apache.olingo.server.api.ODataResponse;
|
||||||
|
import org.apache.olingo.server.api.ServiceMetadata;
|
||||||
|
import org.apache.olingo.server.api.processor.EntityCollectionProcessor;
|
||||||
|
import org.apache.olingo.server.api.serializer.EntityCollectionSerializerOptions;
|
||||||
|
import org.apache.olingo.server.api.serializer.ODataSerializer;
|
||||||
|
import org.apache.olingo.server.api.serializer.SerializerException;
|
||||||
|
import org.apache.olingo.server.api.serializer.SerializerResult;
|
||||||
|
import org.apache.olingo.server.api.uri.UriInfo;
|
||||||
|
import org.apache.olingo.server.api.uri.UriResource;
|
||||||
|
import org.apache.olingo.server.api.uri.UriResourceEntitySet;
|
||||||
|
import org.apache.olingo.server.api.uri.queryoption.FilterOption;
|
||||||
|
import org.apache.olingo.server.api.uri.queryoption.expression.Expression;
|
||||||
|
import org.apache.olingo.server.api.uri.queryoption.expression.ExpressionVisitException;
|
||||||
|
|
||||||
|
public class DemoEntityCollectionProcessor implements EntityCollectionProcessor {
|
||||||
|
|
||||||
|
private OData odata;
|
||||||
|
private ServiceMetadata serviceMetadata;
|
||||||
|
private Storage storage;
|
||||||
|
|
||||||
|
public DemoEntityCollectionProcessor(Storage storage) {
|
||||||
|
this.storage = storage;
|
||||||
|
}
|
||||||
|
|
||||||
|
public void init(OData odata, ServiceMetadata serviceMetadata) {
|
||||||
|
this.odata = odata;
|
||||||
|
this.serviceMetadata = serviceMetadata;
|
||||||
|
}
|
||||||
|
|
||||||
|
public void readEntityCollection(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType responseFormat) throws ODataApplicationException, SerializerException {
|
||||||
|
|
||||||
|
// 1st: retrieve the requested EntitySet from the uriInfo (representation of the parsed URI)
|
||||||
|
List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
|
||||||
|
UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0); // in our example, the first segment is the EntitySet
|
||||||
|
EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();
|
||||||
|
|
||||||
|
// 2nd: fetch the data from backend for this requested EntitySetName and deliver as EntitySet
|
||||||
|
EntityCollection entityCollection = storage.readEntitySetData(edmEntitySet);
|
||||||
|
|
||||||
|
// 3rd: Check if filter system query option is provided and apply the expression if necessary
|
||||||
|
FilterOption filterOption = uriInfo.getFilterOption();
|
||||||
|
if(filterOption != null) {
|
||||||
|
// Apply $filter system query option
|
||||||
|
try {
|
||||||
|
List<Entity> entityList = entityCollection.getEntities();
|
||||||
|
Iterator<Entity> entityIterator = entityList.iterator();
|
||||||
|
|
||||||
|
// Evaluate the expression for each entity
|
||||||
|
// If the expression is evaluated to "true", keep the entity otherwise remove it from the entityList
|
||||||
|
while (entityIterator.hasNext()) {
|
||||||
|
// To evaluate the the expression, create an instance of the Filter Expression Visitor and pass
|
||||||
|
// the current entity to the constructor
|
||||||
|
Entity currentEntity = entityIterator.next();
|
||||||
|
Expression filterExpression = filterOption.getExpression();
|
||||||
|
FilterExpressionVisitor expressionVisitor = new FilterExpressionVisitor(currentEntity);
|
||||||
|
|
||||||
|
// Start evaluating the expression
|
||||||
|
Object visitorResult = filterExpression.accept(expressionVisitor);
|
||||||
|
|
||||||
|
// The result of the filter expression must be of type Edm.Boolean
|
||||||
|
if(visitorResult instanceof Boolean) {
|
||||||
|
if(visitorResult != null && Boolean.FALSE.equals(visitorResult)) {
|
||||||
|
// The expression evaluated to false, so we have to remove the currentEntity from entityList
|
||||||
|
entityIterator.remove();
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
throw new ODataApplicationException("A filter expression must evaulate to type Edm.Boolean",
|
||||||
|
HttpStatusCode.BAD_REQUEST.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
} catch (ExpressionVisitException e) {
|
||||||
|
throw new ODataApplicationException("Exception in filter evaluation",
|
||||||
|
HttpStatusCode.INTERNAL_SERVER_ERROR.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// 4th: create a serializer based on the requested format (json)
|
||||||
|
ODataFormat format = ODataFormat.fromContentType(responseFormat);
|
||||||
|
ODataSerializer serializer = odata.createSerializer(format);
|
||||||
|
|
||||||
|
// and serialize the content: transform from the EntitySet object to InputStream
|
||||||
|
EdmEntityType edmEntityType = edmEntitySet.getEntityType();
|
||||||
|
ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build();
|
||||||
|
|
||||||
|
EntityCollectionSerializerOptions opts = EntityCollectionSerializerOptions.with().contextURL(contextUrl).build();
|
||||||
|
SerializerResult serializerResult = serializer.entityCollection(serviceMetadata, edmEntityType, entityCollection, opts);
|
||||||
|
InputStream serializedContent = serializerResult.getContent();
|
||||||
|
|
||||||
|
// 5th: configure the response object: set the body, headers and status code
|
||||||
|
response.setContent(serializedContent);
|
||||||
|
response.setStatusCode(HttpStatusCode.OK.getStatusCode());
|
||||||
|
response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
@ -0,0 +1,126 @@
|
||||||
|
/*
|
||||||
|
* Licensed to the Apache Software Foundation (ASF) under one
|
||||||
|
* or more contributor license agreements. See the NOTICE file
|
||||||
|
* distributed with this work for additional information
|
||||||
|
* regarding copyright ownership. The ASF licenses this file
|
||||||
|
* to you under the Apache License, Version 2.0 (the
|
||||||
|
* "License"); you may not use this file except in compliance
|
||||||
|
* with the License. You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
*
|
||||||
|
* Unless required by applicable law or agreed to in writing,
|
||||||
|
* software distributed under the License is distributed on an
|
||||||
|
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
||||||
|
* KIND, either express or implied. See the License for the
|
||||||
|
* specific language governing permissions and limitations
|
||||||
|
* under the License.
|
||||||
|
*/
|
||||||
|
package myservice.mynamespace.service;
|
||||||
|
|
||||||
|
import java.io.InputStream;
|
||||||
|
import java.util.List;
|
||||||
|
import java.util.Locale;
|
||||||
|
|
||||||
|
import myservice.mynamespace.data.Storage;
|
||||||
|
|
||||||
|
import org.apache.olingo.commons.api.data.ContextURL;
|
||||||
|
import org.apache.olingo.commons.api.data.Entity;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmEntitySet;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmEntityType;
|
||||||
|
import org.apache.olingo.commons.api.format.ContentType;
|
||||||
|
import org.apache.olingo.commons.api.format.ODataFormat;
|
||||||
|
import org.apache.olingo.commons.api.http.HttpHeader;
|
||||||
|
import org.apache.olingo.commons.api.http.HttpStatusCode;
|
||||||
|
import org.apache.olingo.server.api.OData;
|
||||||
|
import org.apache.olingo.server.api.ODataApplicationException;
|
||||||
|
import org.apache.olingo.server.api.ODataRequest;
|
||||||
|
import org.apache.olingo.server.api.ODataResponse;
|
||||||
|
import org.apache.olingo.server.api.ServiceMetadata;
|
||||||
|
import org.apache.olingo.server.api.deserializer.DeserializerException;
|
||||||
|
import org.apache.olingo.server.api.processor.EntityProcessor;
|
||||||
|
import org.apache.olingo.server.api.serializer.EntitySerializerOptions;
|
||||||
|
import org.apache.olingo.server.api.serializer.ODataSerializer;
|
||||||
|
import org.apache.olingo.server.api.serializer.SerializerException;
|
||||||
|
import org.apache.olingo.server.api.serializer.SerializerResult;
|
||||||
|
import org.apache.olingo.server.api.uri.UriInfo;
|
||||||
|
import org.apache.olingo.server.api.uri.UriParameter;
|
||||||
|
import org.apache.olingo.server.api.uri.UriResource;
|
||||||
|
import org.apache.olingo.server.api.uri.UriResourceEntitySet;
|
||||||
|
|
||||||
|
public class DemoEntityProcessor implements EntityProcessor {
|
||||||
|
|
||||||
|
|
||||||
|
private OData odata;
|
||||||
|
private ServiceMetadata serviceMetadata;
|
||||||
|
private Storage storage;
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
public DemoEntityProcessor(Storage storage) {
|
||||||
|
this.storage = storage;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
public void init(OData odata, ServiceMetadata serviceMetadata) {
|
||||||
|
this.odata = odata;
|
||||||
|
this.serviceMetadata = serviceMetadata;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
public void readEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType responseFormat)
|
||||||
|
throws ODataApplicationException, SerializerException {
|
||||||
|
|
||||||
|
// 1. retrieve the Entity Type
|
||||||
|
List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
|
||||||
|
// Note: only in our example we can assume that the first segment is the EntitySet
|
||||||
|
UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0);
|
||||||
|
EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();
|
||||||
|
|
||||||
|
// 2. retrieve the data from backend
|
||||||
|
List<UriParameter> keyPredicates = uriResourceEntitySet.getKeyPredicates();
|
||||||
|
Entity entity = storage.readEntityData(edmEntitySet, keyPredicates);
|
||||||
|
|
||||||
|
// 3. serialize
|
||||||
|
EdmEntityType entityType = edmEntitySet.getEntityType();
|
||||||
|
|
||||||
|
ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).suffix(ContextURL.Suffix.ENTITY).build();
|
||||||
|
// expand and select currently not supported
|
||||||
|
EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build();
|
||||||
|
|
||||||
|
ODataFormat oDataFormat = ODataFormat.fromContentType(responseFormat);
|
||||||
|
ODataSerializer serializer = this.odata.createSerializer(oDataFormat);
|
||||||
|
SerializerResult serializerResult = serializer.entity(serviceMetadata, entityType, entity, options);
|
||||||
|
InputStream entityStream = serializerResult.getContent();
|
||||||
|
|
||||||
|
//4. configure the response object
|
||||||
|
response.setContent(entityStream);
|
||||||
|
response.setStatusCode(HttpStatusCode.OK.getStatusCode());
|
||||||
|
response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
/*
|
||||||
|
* These processor methods are not handled in this tutorial
|
||||||
|
* */
|
||||||
|
|
||||||
|
|
||||||
|
public void createEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType requestFormat, ContentType responseFormat)
|
||||||
|
throws ODataApplicationException, DeserializerException, SerializerException {
|
||||||
|
throw new ODataApplicationException("Not supported.", HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ROOT);
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
public void updateEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType requestFormat, ContentType responseFormat)
|
||||||
|
throws ODataApplicationException, DeserializerException, SerializerException {
|
||||||
|
throw new ODataApplicationException("Not supported.", HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ROOT);
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
public void deleteEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo) throws ODataApplicationException {
|
||||||
|
throw new ODataApplicationException("Not supported.", HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ROOT);
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
|
@ -0,0 +1,147 @@
|
||||||
|
/*
|
||||||
|
* Licensed to the Apache Software Foundation (ASF) under one
|
||||||
|
* or more contributor license agreements. See the NOTICE file
|
||||||
|
* distributed with this work for additional information
|
||||||
|
* regarding copyright ownership. The ASF licenses this file
|
||||||
|
* to you under the Apache License, Version 2.0 (the
|
||||||
|
* "License"); you may not use this file except in compliance
|
||||||
|
* with the License. You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
*
|
||||||
|
* Unless required by applicable law or agreed to in writing,
|
||||||
|
* software distributed under the License is distributed on an
|
||||||
|
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
||||||
|
* KIND, either express or implied. See the License for the
|
||||||
|
* specific language governing permissions and limitations
|
||||||
|
* under the License.
|
||||||
|
*/
|
||||||
|
package myservice.mynamespace.service;
|
||||||
|
|
||||||
|
import java.io.InputStream;
|
||||||
|
import java.util.List;
|
||||||
|
import java.util.Locale;
|
||||||
|
|
||||||
|
import myservice.mynamespace.data.Storage;
|
||||||
|
|
||||||
|
import org.apache.olingo.commons.api.data.ContextURL;
|
||||||
|
import org.apache.olingo.commons.api.data.Entity;
|
||||||
|
import org.apache.olingo.commons.api.data.Property;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmEntitySet;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmPrimitiveType;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmProperty;
|
||||||
|
import org.apache.olingo.commons.api.format.ContentType;
|
||||||
|
import org.apache.olingo.commons.api.format.ODataFormat;
|
||||||
|
import org.apache.olingo.commons.api.http.HttpHeader;
|
||||||
|
import org.apache.olingo.commons.api.http.HttpStatusCode;
|
||||||
|
import org.apache.olingo.server.api.OData;
|
||||||
|
import org.apache.olingo.server.api.ODataApplicationException;
|
||||||
|
import org.apache.olingo.server.api.ODataRequest;
|
||||||
|
import org.apache.olingo.server.api.ODataResponse;
|
||||||
|
import org.apache.olingo.server.api.ServiceMetadata;
|
||||||
|
import org.apache.olingo.server.api.deserializer.DeserializerException;
|
||||||
|
import org.apache.olingo.server.api.processor.PrimitiveProcessor;
|
||||||
|
import org.apache.olingo.server.api.serializer.ODataSerializer;
|
||||||
|
import org.apache.olingo.server.api.serializer.PrimitiveSerializerOptions;
|
||||||
|
import org.apache.olingo.server.api.serializer.SerializerException;
|
||||||
|
import org.apache.olingo.server.api.serializer.SerializerResult;
|
||||||
|
import org.apache.olingo.server.api.uri.UriInfo;
|
||||||
|
import org.apache.olingo.server.api.uri.UriParameter;
|
||||||
|
import org.apache.olingo.server.api.uri.UriResource;
|
||||||
|
import org.apache.olingo.server.api.uri.UriResourceEntitySet;
|
||||||
|
import org.apache.olingo.server.api.uri.UriResourceProperty;
|
||||||
|
|
||||||
|
public class DemoPrimitiveProcessor implements PrimitiveProcessor {
|
||||||
|
|
||||||
|
private OData odata;
|
||||||
|
private Storage storage;
|
||||||
|
|
||||||
|
public DemoPrimitiveProcessor(Storage storage) {
|
||||||
|
this.storage = storage;
|
||||||
|
}
|
||||||
|
|
||||||
|
public void init(OData odata, ServiceMetadata serviceMetadata) {
|
||||||
|
this.odata = odata;
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* In our example, the URL would be: http://localhost:8080/DemoService/DemoService.svc/Products(1)/Name
|
||||||
|
* and the response:
|
||||||
|
* {
|
||||||
|
* @odata.context: "$metadata#Products/Name",
|
||||||
|
* value: "Notebook Basic 15"
|
||||||
|
* }
|
||||||
|
* */
|
||||||
|
public void readPrimitive(ODataRequest request, ODataResponse response,
|
||||||
|
UriInfo uriInfo, ContentType responseFormat)
|
||||||
|
throws ODataApplicationException, SerializerException {
|
||||||
|
|
||||||
|
// 1. Retrieve info from URI
|
||||||
|
// 1.1. retrieve the info about the requested entity set
|
||||||
|
List<UriResource> resourceParts = uriInfo.getUriResourceParts();
|
||||||
|
// Note: only in our example we can rely that the first segment is the EntitySet
|
||||||
|
UriResourceEntitySet uriEntityset = (UriResourceEntitySet) resourceParts.get(0);
|
||||||
|
EdmEntitySet edmEntitySet = uriEntityset.getEntitySet();
|
||||||
|
// the key for the entity
|
||||||
|
List<UriParameter> keyPredicates = uriEntityset.getKeyPredicates();
|
||||||
|
|
||||||
|
// 1.2. retrieve the requested (Edm) property
|
||||||
|
UriResourceProperty uriProperty = (UriResourceProperty)resourceParts.get(resourceParts.size() -1); // the last segment is the Property
|
||||||
|
EdmProperty edmProperty = uriProperty.getProperty();
|
||||||
|
String edmPropertyName = edmProperty.getName();
|
||||||
|
// in our example, we know we have only primitive types in our model
|
||||||
|
EdmPrimitiveType edmPropertyType = (EdmPrimitiveType) edmProperty.getType();
|
||||||
|
|
||||||
|
|
||||||
|
// 2. retrieve data from backend
|
||||||
|
// 2.1. retrieve the entity data, for which the property has to be read
|
||||||
|
Entity entity = storage.readEntityData(edmEntitySet, keyPredicates);
|
||||||
|
if (entity == null) { // Bad request
|
||||||
|
throw new ODataApplicationException("Entity not found", HttpStatusCode.NOT_FOUND.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
|
||||||
|
// 2.2. retrieve the property data from the entity
|
||||||
|
Property property = entity.getProperty(edmPropertyName);
|
||||||
|
if (property == null) {
|
||||||
|
throw new ODataApplicationException("Property not found", HttpStatusCode.NOT_FOUND.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
|
||||||
|
// 3. serialize
|
||||||
|
Object value = property.getValue();
|
||||||
|
if (value != null) {
|
||||||
|
// 3.1. configure the serializer
|
||||||
|
ODataFormat format = ODataFormat.fromContentType(responseFormat);
|
||||||
|
ODataSerializer serializer = odata.createSerializer(format);
|
||||||
|
|
||||||
|
ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).navOrPropertyPath(edmPropertyName).build();
|
||||||
|
PrimitiveSerializerOptions options = PrimitiveSerializerOptions.with().contextURL(contextUrl).build();
|
||||||
|
// 3.2. serialize
|
||||||
|
SerializerResult serializerResult = serializer.primitive(edmPropertyType, property, options);
|
||||||
|
InputStream propertyStream = serializerResult.getContent();
|
||||||
|
|
||||||
|
//4. configure the response object
|
||||||
|
response.setContent(propertyStream);
|
||||||
|
response.setStatusCode(HttpStatusCode.OK.getStatusCode());
|
||||||
|
response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
|
||||||
|
} else {
|
||||||
|
// in case there's no value for the property, we can skip the serialization
|
||||||
|
response.setStatusCode(HttpStatusCode.NO_CONTENT.getStatusCode());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
/*
|
||||||
|
* These processor methods are not handled in this tutorial
|
||||||
|
* */
|
||||||
|
|
||||||
|
public void updatePrimitive(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType requestFormat, ContentType responseFormat)
|
||||||
|
throws ODataApplicationException, DeserializerException, SerializerException {
|
||||||
|
throw new ODataApplicationException("Not supported.", HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ROOT);
|
||||||
|
}
|
||||||
|
|
||||||
|
public void deletePrimitive(ODataRequest request, ODataResponse response, UriInfo uriInfo) throws ODataApplicationException {
|
||||||
|
throw new ODataApplicationException("Not supported.", HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ROOT);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
@ -0,0 +1,308 @@
|
||||||
|
/*
|
||||||
|
* Licensed to the Apache Software Foundation (ASF) under one
|
||||||
|
* or more contributor license agreements. See the NOTICE file
|
||||||
|
* distributed with this work for additional information
|
||||||
|
* regarding copyright ownership. The ASF licenses this file
|
||||||
|
* to you under the Apache License, Version 2.0 (the
|
||||||
|
* "License"); you may not use this file except in compliance
|
||||||
|
* with the License. You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
*
|
||||||
|
* Unless required by applicable law or agreed to in writing,
|
||||||
|
* software distributed under the License is distributed on an
|
||||||
|
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
||||||
|
* KIND, either express or implied. See the License for the
|
||||||
|
* specific language governing permissions and limitations
|
||||||
|
* under the License.
|
||||||
|
*/
|
||||||
|
package myservice.mynamespace.service;
|
||||||
|
|
||||||
|
import java.util.List;
|
||||||
|
import java.util.Locale;
|
||||||
|
|
||||||
|
import org.apache.olingo.commons.api.data.Entity;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmEnumType;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmType;
|
||||||
|
import org.apache.olingo.commons.api.http.HttpStatusCode;
|
||||||
|
import org.apache.olingo.server.api.ODataApplicationException;
|
||||||
|
import org.apache.olingo.server.api.uri.UriInfoResource;
|
||||||
|
import org.apache.olingo.server.api.uri.UriResource;
|
||||||
|
import org.apache.olingo.server.api.uri.UriResourcePrimitiveProperty;
|
||||||
|
import org.apache.olingo.server.api.uri.queryoption.expression.BinaryOperatorKind;
|
||||||
|
import org.apache.olingo.server.api.uri.queryoption.expression.Expression;
|
||||||
|
import org.apache.olingo.server.api.uri.queryoption.expression.ExpressionVisitException;
|
||||||
|
import org.apache.olingo.server.api.uri.queryoption.expression.ExpressionVisitor;
|
||||||
|
import org.apache.olingo.server.api.uri.queryoption.expression.MethodKind;
|
||||||
|
import org.apache.olingo.server.api.uri.queryoption.expression.UnaryOperatorKind;
|
||||||
|
|
||||||
|
public class FilterExpressionVisitor implements ExpressionVisitor<Object> {
|
||||||
|
|
||||||
|
private Entity currentEntity;
|
||||||
|
|
||||||
|
public FilterExpressionVisitor(Entity currentEntity) {
|
||||||
|
this.currentEntity = currentEntity;
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public Object visitMember(UriInfoResource member) throws ExpressionVisitException, ODataApplicationException {
|
||||||
|
// To keeps things simple, this tutorial allows only primitive properties.
|
||||||
|
// We have faith that the java type of Edm.Int32 is Integer
|
||||||
|
|
||||||
|
final List<UriResource> uriResourceParts = member.getUriResourceParts();
|
||||||
|
|
||||||
|
// Make sure that the resource path of the property contains only a single segment and a primitive property
|
||||||
|
// has been addressed. We can be sure, that the property exists because the UriParser checks if the
|
||||||
|
// property has been defined in service metadata document.
|
||||||
|
|
||||||
|
if(uriResourceParts.size() == 1 && uriResourceParts.get(0) instanceof UriResourcePrimitiveProperty) {
|
||||||
|
UriResourcePrimitiveProperty uriResourceProperty = (UriResourcePrimitiveProperty) uriResourceParts.get(0);
|
||||||
|
return currentEntity.getProperty(uriResourceProperty.getProperty().getName()).getValue();
|
||||||
|
|
||||||
|
} else {
|
||||||
|
throw new ODataApplicationException("Only primitive properties are implemented in filter expressions",
|
||||||
|
HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public Object visitLiteral(String literal) throws ExpressionVisitException, ODataApplicationException {
|
||||||
|
// To keep this tutorial simple, our filter expression visitor supports only Edm.Int32 and Edm.String
|
||||||
|
// In real world scenarios it can be difficult to guess the type of an literal.
|
||||||
|
// We can be sure, that the literal is a valid OData literal because the URI Parser checks
|
||||||
|
// the lexicographical structure
|
||||||
|
|
||||||
|
// String literals start and end with an single quotation mark
|
||||||
|
if(literal.startsWith("'") && literal.endsWith("'")) {
|
||||||
|
String stringLiteral = "";
|
||||||
|
if(literal.length() > 2) {
|
||||||
|
stringLiteral = literal.substring(1, literal.length() - 1);
|
||||||
|
}
|
||||||
|
|
||||||
|
return stringLiteral;
|
||||||
|
} else {
|
||||||
|
// Try to convert the literal into an Java Integer
|
||||||
|
try {
|
||||||
|
return Integer.parseInt(literal);
|
||||||
|
} catch(NumberFormatException e) {
|
||||||
|
throw new ODataApplicationException("Only Edm.Int32 and Edm.String literals are implemented",
|
||||||
|
HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public Object visitUnaryOperator(UnaryOperatorKind operator, Object operand)
|
||||||
|
throws ExpressionVisitException, ODataApplicationException {
|
||||||
|
// OData allows two different unary operators. We have to take care, that the type of the operand fits to
|
||||||
|
// operand
|
||||||
|
|
||||||
|
if(operator == UnaryOperatorKind.NOT && operand instanceof Boolean) {
|
||||||
|
// 1.) boolean negation
|
||||||
|
return !(Boolean) operand;
|
||||||
|
} else if(operator == UnaryOperatorKind.MINUS && operand instanceof Integer){
|
||||||
|
// 2.) arithmetic minus
|
||||||
|
return -(Integer) operand;
|
||||||
|
}
|
||||||
|
|
||||||
|
// Operation not processed, throw an exception
|
||||||
|
throw new ODataApplicationException("Invalid type for unary operator",
|
||||||
|
HttpStatusCode.BAD_REQUEST.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public Object visitBinaryOperator(BinaryOperatorKind operator, Object left, Object right)
|
||||||
|
throws ExpressionVisitException, ODataApplicationException {
|
||||||
|
|
||||||
|
// Binary Operators are split up in three different kinds. Up to the kind of the operator it can be applied
|
||||||
|
// to different types
|
||||||
|
// - Arithmetic operations like add, minus, modulo, etc. are allowed on numeric types like Edm.Int32
|
||||||
|
// - Logical operations are allowed on numeric types and also Edm.String
|
||||||
|
// - Boolean operations like and, or are allowed on Edm.Boolean
|
||||||
|
// A detailed explanation can be found in OData Version 4.0 Part 2: URL Conventions
|
||||||
|
|
||||||
|
switch (operator) {
|
||||||
|
|
||||||
|
// Arithmetic operations
|
||||||
|
case ADD:
|
||||||
|
/** Fall through **/
|
||||||
|
case MOD:
|
||||||
|
/** Fall through **/
|
||||||
|
case MUL:
|
||||||
|
/** Fall through **/
|
||||||
|
case DIV:
|
||||||
|
/** Fall through **/
|
||||||
|
case SUB:
|
||||||
|
return evaluateArithmeticOperation(operator, left, right);
|
||||||
|
|
||||||
|
// Logical operations
|
||||||
|
case EQ:
|
||||||
|
/** Fall through **/
|
||||||
|
case NE:
|
||||||
|
/** Fall through **/
|
||||||
|
case GE:
|
||||||
|
/** Fall through **/
|
||||||
|
case GT:
|
||||||
|
/** Fall through **/
|
||||||
|
case LE:
|
||||||
|
/** Fall through **/
|
||||||
|
case LT:
|
||||||
|
return evaluateLogicalOperation(operator, left, right);
|
||||||
|
|
||||||
|
// Boolean operations
|
||||||
|
case AND:
|
||||||
|
/** Fall through **/
|
||||||
|
case OR:
|
||||||
|
return evaluateBooleanOperation(operator, left, right);
|
||||||
|
|
||||||
|
case HAS:
|
||||||
|
// Has operation is not supported. We do not use enums in our service.
|
||||||
|
/** fall through **/
|
||||||
|
default:
|
||||||
|
throw new ODataApplicationException("Binary operation " + operator.name() + " is not implemented",
|
||||||
|
HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private Object evaluateBooleanOperation(BinaryOperatorKind operator, Object left, Object right)
|
||||||
|
throws ODataApplicationException {
|
||||||
|
|
||||||
|
// First check that both operands are of type Boolean
|
||||||
|
if(left instanceof Boolean && right instanceof Boolean) {
|
||||||
|
Boolean valueLeft = (Boolean) left;
|
||||||
|
Boolean valueRight = (Boolean) right;
|
||||||
|
|
||||||
|
// Than calculate the result value
|
||||||
|
if(operator == BinaryOperatorKind.AND) {
|
||||||
|
return valueLeft && valueRight;
|
||||||
|
} else {
|
||||||
|
// OR
|
||||||
|
return valueLeft || valueRight;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
throw new ODataApplicationException("Boolean operations needs two numeric operands",
|
||||||
|
HttpStatusCode.BAD_REQUEST.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@SuppressWarnings("unchecked")
|
||||||
|
private Object evaluateLogicalOperation(BinaryOperatorKind operator, Object left, Object right)
|
||||||
|
throws ODataApplicationException {
|
||||||
|
|
||||||
|
// All types in our tutorial supports all logical operations, but we have to make sure that the types are equals
|
||||||
|
if(left.getClass().equals(right.getClass())) {
|
||||||
|
// Luckily all used types String, Boolean and also Integer supports the interface Comparable
|
||||||
|
// TODO: Is this OK? Otherwise we can infer generic arguments after using an if statement
|
||||||
|
@SuppressWarnings("rawtypes")
|
||||||
|
int result = ((Comparable) left).compareTo(right);
|
||||||
|
|
||||||
|
if (operator == BinaryOperatorKind.EQ) {
|
||||||
|
return result == 0;
|
||||||
|
} else if (operator == BinaryOperatorKind.NE) {
|
||||||
|
return result != 0;
|
||||||
|
} else if (operator == BinaryOperatorKind.GE) {
|
||||||
|
return result >= 0;
|
||||||
|
} else if (operator == BinaryOperatorKind.GT) {
|
||||||
|
return result > 0;
|
||||||
|
} else if (operator == BinaryOperatorKind.LE) {
|
||||||
|
return result <= 0;
|
||||||
|
} else {
|
||||||
|
// BinaryOperatorKind.LT
|
||||||
|
return result < 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
} else {
|
||||||
|
throw new ODataApplicationException("Comparision needs to equal types",
|
||||||
|
HttpStatusCode.BAD_REQUEST.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private Object evaluateArithmeticOperation(BinaryOperatorKind operator, Object left,
|
||||||
|
Object right) throws ODataApplicationException {
|
||||||
|
|
||||||
|
// First check if the type of of both operands is numerical
|
||||||
|
if(left instanceof Integer && right instanceof Integer) {
|
||||||
|
Integer valueLeft = (Integer) left;
|
||||||
|
Integer valueRight = (Integer) right;
|
||||||
|
|
||||||
|
// Than calculate the result value
|
||||||
|
if(operator == BinaryOperatorKind.ADD) {
|
||||||
|
return valueLeft + valueRight;
|
||||||
|
} else if(operator == BinaryOperatorKind.SUB) {
|
||||||
|
return valueLeft - valueRight;
|
||||||
|
} else if(operator == BinaryOperatorKind.MUL) {
|
||||||
|
return valueLeft * valueRight;
|
||||||
|
} else if(operator == BinaryOperatorKind.DIV) {
|
||||||
|
return valueLeft / valueRight;
|
||||||
|
} else {
|
||||||
|
// BinaryOperatorKind,MOD
|
||||||
|
return valueLeft % valueRight;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
throw new ODataApplicationException("Arithmetic operations needs two numeric operands",
|
||||||
|
HttpStatusCode.BAD_REQUEST.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public Object visitMethodCall(MethodKind methodCall, List<Object> parameters)
|
||||||
|
throws ExpressionVisitException, ODataApplicationException {
|
||||||
|
|
||||||
|
// To keep this tutorial small and simple, we implement only one method call
|
||||||
|
if(methodCall == MethodKind.CONTAINS) {
|
||||||
|
// "Contains" gets two parameters, both have to be of type String
|
||||||
|
// e.g. /Products?$filter=contains(Description, '1024 MB')
|
||||||
|
//
|
||||||
|
// First the method visistMember is called, which returns the current String value of the property.
|
||||||
|
// After that the method visitLiteral is called with the string literal '1024 MB',
|
||||||
|
// which returns a String
|
||||||
|
//
|
||||||
|
// Both String values are passed to visitMethodCall.
|
||||||
|
if(parameters.get(0) instanceof String && parameters.get(1) instanceof String) {
|
||||||
|
String valueParam1 = (String) parameters.get(0);
|
||||||
|
String valueParam2 = (String) parameters.get(1);
|
||||||
|
|
||||||
|
return valueParam1.contains(valueParam2);
|
||||||
|
} else {
|
||||||
|
throw new ODataApplicationException("Contains needs two parametes of type Edm.String",
|
||||||
|
HttpStatusCode.BAD_REQUEST.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
throw new ODataApplicationException("Method call " + methodCall + " not implemented",
|
||||||
|
HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public Object visitTypeLiteral(EdmType type) throws ExpressionVisitException, ODataApplicationException {
|
||||||
|
throw new ODataApplicationException("Type literals are not implemented",
|
||||||
|
HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public Object visitAlias(String aliasName) throws ExpressionVisitException, ODataApplicationException {
|
||||||
|
throw new ODataApplicationException("Aliases are not implemented",
|
||||||
|
HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public Object visitEnum(EdmEnumType type, List<String> enumValues)
|
||||||
|
throws ExpressionVisitException, ODataApplicationException {
|
||||||
|
throw new ODataApplicationException("Enums are not implemented",
|
||||||
|
HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public Object visitLambdaExpression(String lambdaFunction, String lambdaVariable, Expression expression)
|
||||||
|
throws ExpressionVisitException, ODataApplicationException {
|
||||||
|
throw new ODataApplicationException("Lamdba expressions are not implemented",
|
||||||
|
HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public Object visitLambdaReference(String variableName)
|
||||||
|
throws ExpressionVisitException, ODataApplicationException {
|
||||||
|
throw new ODataApplicationException("Lamdba references are not implemented",
|
||||||
|
HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
@ -0,0 +1,120 @@
|
||||||
|
/*
|
||||||
|
* Licensed to the Apache Software Foundation (ASF) under one
|
||||||
|
* or more contributor license agreements. See the NOTICE file
|
||||||
|
* distributed with this work for additional information
|
||||||
|
* regarding copyright ownership. The ASF licenses this file
|
||||||
|
* to you under the Apache License, Version 2.0 (the
|
||||||
|
* "License"); you may not use this file except in compliance
|
||||||
|
* with the License. You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
*
|
||||||
|
* Unless required by applicable law or agreed to in writing,
|
||||||
|
* software distributed under the License is distributed on an
|
||||||
|
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
||||||
|
* KIND, either express or implied. See the License for the
|
||||||
|
* specific language governing permissions and limitations
|
||||||
|
* under the License.
|
||||||
|
*/
|
||||||
|
package myservice.mynamespace.util;
|
||||||
|
|
||||||
|
import java.util.List;
|
||||||
|
import java.util.Locale;
|
||||||
|
|
||||||
|
import org.apache.olingo.commons.api.data.Entity;
|
||||||
|
import org.apache.olingo.commons.api.data.EntityCollection;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmEntitySet;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmEntityType;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmPrimitiveType;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmPrimitiveTypeException;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmProperty;
|
||||||
|
import org.apache.olingo.commons.api.edm.EdmType;
|
||||||
|
import org.apache.olingo.commons.api.http.HttpStatusCode;
|
||||||
|
import org.apache.olingo.server.api.ODataApplicationException;
|
||||||
|
import org.apache.olingo.server.api.uri.UriInfoResource;
|
||||||
|
import org.apache.olingo.server.api.uri.UriParameter;
|
||||||
|
import org.apache.olingo.server.api.uri.UriResource;
|
||||||
|
import org.apache.olingo.server.api.uri.UriResourceEntitySet;
|
||||||
|
|
||||||
|
public class Util {
|
||||||
|
|
||||||
|
public static EdmEntitySet getEdmEntitySet(UriInfoResource uriInfo) throws ODataApplicationException {
|
||||||
|
List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
|
||||||
|
// To get the entity set we have to interpret all URI segments
|
||||||
|
if (!(resourcePaths.get(0) instanceof UriResourceEntitySet)) {
|
||||||
|
// Here we should interpret the whole URI but in this example we do not support navigation so we throw an exception
|
||||||
|
throw new ODataApplicationException("Invalid resource type for first segment.", HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(),Locale.ENGLISH);
|
||||||
|
}
|
||||||
|
|
||||||
|
UriResourceEntitySet uriResource = (UriResourceEntitySet) resourcePaths.get(0);
|
||||||
|
|
||||||
|
return uriResource.getEntitySet();
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
public static Entity findEntity(EdmEntityType edmEntityType, EntityCollection entitySet, List<UriParameter> keyParams) throws ODataApplicationException {
|
||||||
|
|
||||||
|
List<Entity> entityList = entitySet.getEntities();
|
||||||
|
|
||||||
|
// loop over all entities in order to find that one that matches all keys in request e.g. contacts(ContactID=1, CompanyID=1)
|
||||||
|
for(Entity entity : entityList){
|
||||||
|
boolean foundEntity = entityMatchesAllKeys(edmEntityType, entity, keyParams);
|
||||||
|
if(foundEntity) {
|
||||||
|
return entity;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return null;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
public static boolean
|
||||||
|
entityMatchesAllKeys(EdmEntityType edmEntityType, Entity rt_entity, List<UriParameter> keyParams)
|
||||||
|
throws ODataApplicationException {
|
||||||
|
|
||||||
|
// loop over all keys
|
||||||
|
for (final UriParameter key : keyParams) {
|
||||||
|
// key
|
||||||
|
String keyName = key.getName();
|
||||||
|
String keyText = key.getText();
|
||||||
|
|
||||||
|
// Edm: we need this info for the comparison below
|
||||||
|
EdmProperty edmKeyProperty = (EdmProperty) edmEntityType.getProperty(keyName);
|
||||||
|
Boolean isNullable = edmKeyProperty.isNullable();
|
||||||
|
Integer maxLength = edmKeyProperty.getMaxLength();
|
||||||
|
Integer precision = edmKeyProperty.getPrecision();
|
||||||
|
Boolean isUnicode = edmKeyProperty.isUnicode();
|
||||||
|
Integer scale = edmKeyProperty.getScale();
|
||||||
|
// get the EdmType in order to compare
|
||||||
|
EdmType edmType = edmKeyProperty.getType();
|
||||||
|
// if(EdmType instanceof EdmPrimitiveType) // do we need this?
|
||||||
|
EdmPrimitiveType edmPrimitiveType = (EdmPrimitiveType) edmType;
|
||||||
|
|
||||||
|
// Runtime data: the value of the current entity
|
||||||
|
// don't need to check for null, this is done in olingo library
|
||||||
|
Object valueObject = rt_entity.getProperty(keyName).getValue();
|
||||||
|
|
||||||
|
// now need to compare the valueObject with the keyText String
|
||||||
|
// this is done using type.valueToString
|
||||||
|
String valueAsString = null;
|
||||||
|
try {
|
||||||
|
valueAsString = edmPrimitiveType.valueToString(valueObject, isNullable, maxLength, precision, scale, isUnicode);
|
||||||
|
} catch (EdmPrimitiveTypeException e) {
|
||||||
|
throw new ODataApplicationException("Failed to retrieve String value",
|
||||||
|
HttpStatusCode.INTERNAL_SERVER_ERROR.getStatusCode(), Locale.ENGLISH, e);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (valueAsString == null) {
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
boolean matches = valueAsString.equals(keyText);
|
||||||
|
if (!matches) {
|
||||||
|
// if any of the key properties is not found in the entity, we don't need to search further
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
@ -0,0 +1,76 @@
|
||||||
|
/*
|
||||||
|
* Licensed to the Apache Software Foundation (ASF) under one
|
||||||
|
* or more contributor license agreements. See the NOTICE file
|
||||||
|
* distributed with this work for additional information
|
||||||
|
* regarding copyright ownership. The ASF licenses this file
|
||||||
|
* to you under the Apache License, Version 2.0 (the
|
||||||
|
* "License"); you may not use this file except in compliance
|
||||||
|
* with the License. You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
*
|
||||||
|
* Unless required by applicable law or agreed to in writing,
|
||||||
|
* software distributed under the License is distributed on an
|
||||||
|
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
||||||
|
* KIND, either express or implied. See the License for the
|
||||||
|
* specific language governing permissions and limitations
|
||||||
|
* under the License.
|
||||||
|
*/
|
||||||
|
package myservice.mynamespace.web;
|
||||||
|
|
||||||
|
import java.io.IOException;
|
||||||
|
import java.lang.Override;import java.lang.RuntimeException;import java.util.ArrayList;
|
||||||
|
|
||||||
|
import javax.servlet.ServletException;
|
||||||
|
import javax.servlet.http.HttpServlet;
|
||||||
|
import javax.servlet.http.HttpServletRequest;
|
||||||
|
import javax.servlet.http.HttpServletResponse;
|
||||||
|
import javax.servlet.http.HttpSession;
|
||||||
|
|
||||||
|
import myservice.mynamespace.data.Storage;
|
||||||
|
import myservice.mynamespace.service.DemoEdmProvider;
|
||||||
|
import myservice.mynamespace.service.DemoEntityCollectionProcessor;
|
||||||
|
import myservice.mynamespace.service.DemoEntityProcessor;
|
||||||
|
import myservice.mynamespace.service.DemoPrimitiveProcessor;
|
||||||
|
|
||||||
|
import org.apache.olingo.server.api.OData;
|
||||||
|
import org.apache.olingo.server.api.ODataHttpHandler;
|
||||||
|
import org.apache.olingo.server.api.ServiceMetadata;
|
||||||
|
import org.apache.olingo.server.api.edmx.EdmxReference;
|
||||||
|
import org.slf4j.Logger;
|
||||||
|
import org.slf4j.LoggerFactory;
|
||||||
|
|
||||||
|
public class DemoServlet extends HttpServlet {
|
||||||
|
|
||||||
|
private static final long serialVersionUID = 1L;
|
||||||
|
private static final Logger LOG = LoggerFactory.getLogger(DemoServlet.class);
|
||||||
|
|
||||||
|
|
||||||
|
@Override
|
||||||
|
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
|
||||||
|
try {
|
||||||
|
HttpSession session = req.getSession(true);
|
||||||
|
Storage storage = (Storage) session.getAttribute(Storage.class.getName());
|
||||||
|
if (storage == null) {
|
||||||
|
storage = new Storage();
|
||||||
|
session.setAttribute(Storage.class.getName(), storage);
|
||||||
|
}
|
||||||
|
|
||||||
|
// create odata handler and configure it with EdmProvider and Processor
|
||||||
|
OData odata = OData.newInstance();
|
||||||
|
ServiceMetadata edm = odata.createServiceMetadata(new DemoEdmProvider(), new ArrayList<EdmxReference>());
|
||||||
|
ODataHttpHandler handler = odata.createHandler(edm);
|
||||||
|
handler.register(new DemoEntityCollectionProcessor(storage));
|
||||||
|
handler.register(new DemoEntityProcessor(storage));
|
||||||
|
handler.register(new DemoPrimitiveProcessor(storage));
|
||||||
|
|
||||||
|
// let the handler do the work
|
||||||
|
handler.process(req, resp);
|
||||||
|
} catch (RuntimeException e) {
|
||||||
|
LOG.error("Server Error occurred in ExampleServlet", e);
|
||||||
|
throw new ServletException(e);
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
|
@ -0,0 +1,40 @@
|
||||||
|
<?xml version="1.0" encoding="UTF-8"?>
|
||||||
|
<!--
|
||||||
|
Licensed to the Apache Software Foundation (ASF) under one
|
||||||
|
or more contributor license agreements. See the NOTICE file
|
||||||
|
distributed with this work for additional information
|
||||||
|
regarding copyright ownership. The ASF licenses this file
|
||||||
|
to you under the Apache License, Version 2.0 (the
|
||||||
|
"License"); you may not use this file except in compliance
|
||||||
|
with the License. You may obtain a copy of the License at
|
||||||
|
|
||||||
|
http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
|
||||||
|
Unless required by applicable law or agreed to in writing,
|
||||||
|
software distributed under the License is distributed on an
|
||||||
|
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
||||||
|
KIND, either express or implied. See the License for the
|
||||||
|
specific language governing permissions and limitations
|
||||||
|
under the License.
|
||||||
|
-->
|
||||||
|
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||||
|
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
|
||||||
|
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
|
||||||
|
id="WebApp_ID" version="2.5">
|
||||||
|
|
||||||
|
<!-- Register the HttpServlet implementation -->
|
||||||
|
<servlet>
|
||||||
|
<servlet-name>DemoServlet</servlet-name>
|
||||||
|
<servlet-class>myservice.mynamespace.web.DemoServlet</servlet-class>
|
||||||
|
<load-on-startup>1</load-on-startup>
|
||||||
|
</servlet>
|
||||||
|
|
||||||
|
<!--
|
||||||
|
Our OData service can be invoked at
|
||||||
|
http://localhost:8080/DemoService/DemoService.svc
|
||||||
|
-->
|
||||||
|
<servlet-mapping>
|
||||||
|
<servlet-name>DemoServlet</servlet-name>
|
||||||
|
<url-pattern>/DemoService.svc/*</url-pattern>
|
||||||
|
</servlet-mapping>
|
||||||
|
</web-app>
|
||||||
|
|
@ -0,0 +1,24 @@
|
||||||
|
/*
|
||||||
|
* Licensed to the Apache Software Foundation (ASF) under one
|
||||||
|
* or more contributor license agreements. See the NOTICE file
|
||||||
|
* distributed with this work for additional information
|
||||||
|
* regarding copyright ownership. The ASF licenses this file
|
||||||
|
* to you under the Apache License, Version 2.0 (the
|
||||||
|
* "License"); you may not use this file except in compliance
|
||||||
|
* with the License. You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
*
|
||||||
|
* Unless required by applicable law or agreed to in writing,
|
||||||
|
* software distributed under the License is distributed on an
|
||||||
|
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
||||||
|
* KIND, either express or implied. See the License for the
|
||||||
|
* specific language governing permissions and limitations
|
||||||
|
* under the License.
|
||||||
|
*/
|
||||||
|
<html>
|
||||||
|
<body>
|
||||||
|
<h2>Hello World!</h2>
|
||||||
|
<a href="DemoService.svc/">OData Olingo V4 Demo Service</a>
|
||||||
|
</body>
|
||||||
|
</html>
|
||||||
Loading…
Reference in New Issue