Introduction to XPath

2016-06-08 23:13:45 +02:00 · 2016-06-08 23:13:45 +02:00 · a156fa8590
parent 9be037e24f
commit a156fa8590
6 changed files with 480 additions and 1 deletions
--- a/pom.xml
+++ b/pom.xml
@ -66,7 +66,7 @@
        <module>spring-thymeleaf</module>
        <module>spring-zuul</module>
        <module>jsf</module>
-
+        <module>xml</module>
    </modules>

 </project>
--- a/xml/pom.xml
+++ b/xml/pom.xml
@ -0,0 +1,139 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung</groupId>
+    <artifactId>xml</artifactId>
+    <version>0.1-SNAPSHOT</version>
+
+    <name>xml</name>
+
+    <dependencies>   
+    	  <!-- utils -->
+
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.4</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>4.0</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+    	
+    
+        <!-- test scoped -->
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-core</artifactId>
+            <version>${org.hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-library</artifactId>
+            <version>${org.hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>${mockito.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <finalName>xml</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${maven-surefire-plugin.version}</version>
+            </plugin>
+
+        </plugins>
+
+    </build>
+
+   <properties>
+        <!-- persistence -->
+        <hibernate.version>4.3.11.Final</hibernate.version>
+        <mysql-connector-java.version>5.1.38</mysql-connector-java.version>
+
+        <!-- marshalling -->
+        <jackson.version>2.7.2</jackson.version>
+
+        <!-- logging -->
+        <org.slf4j.version>1.7.13</org.slf4j.version>
+        <logback.version>1.1.3</logback.version>
+
+        <!-- various -->
+        <hibernate-validator.version>5.1.3.Final</hibernate-validator.version>
+
+        <!-- util -->
+        <guava.version>19.0</guava.version>
+        <commons-lang3.version>3.4</commons-lang3.version>
+
+        <!-- testing -->
+        <org.hamcrest.version>1.3</org.hamcrest.version>
+        <junit.version>4.12</junit.version>
+        <mockito.version>1.10.19</mockito.version>
+
+        <httpcore.version>4.4.1</httpcore.version>
+        <httpclient.version>4.5</httpclient.version>
+
+        <rest-assured.version>2.9.0</rest-assured.version>
+
+        <!-- maven plugins -->
+        <maven-compiler-plugin.version>3.5.1</maven-compiler-plugin.version>
+        <maven-war-plugin.version>2.6</maven-war-plugin.version>
+        <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
+        <maven-resources-plugin.version>2.7</maven-resources-plugin.version>
+        <cargo-maven2-plugin.version>1.4.18</cargo-maven2-plugin.version>
+
+    </properties>
+
+</project>
+
--- a/xml/src/main/java/com/baeldung/xml/DefaultParser.java
+++ b/xml/src/main/java/com/baeldung/xml/DefaultParser.java
@ -0,0 +1,193 @@
+package com.baeldung.xml;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.Iterator;
+
+import javax.xml.namespace.NamespaceContext;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpressionException;
+import javax.xml.xpath.XPathFactory;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.xml.sax.SAXException;
+
+public class DefaultParser {
+    
+    private File file;
+
+    public DefaultParser(File file) {
+        this.file = file;
+    }
+
+    public NodeList getFirstLevelNodeList() {
+        NodeList nodeList = null;
+        try {
+            FileInputStream fileIS = new FileInputStream(this.getFile());
+            DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
+
+            DocumentBuilder builder = builderFactory.newDocumentBuilder();
+
+            Document xmlDocument = builder.parse(fileIS);
+
+            XPath xPath = XPathFactory.newInstance().newXPath();
+
+            String expression = "/Tutorials/Tutorial";
+
+            nodeList = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET);
+
+        } catch (SAXException | IOException | ParserConfigurationException | XPathExpressionException e) {
+            e.printStackTrace();
+        }
+        return nodeList;
+    }
+
+    public Node getNodeById(String id) {
+        Node node = null;
+        try {
+            DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
+
+            DocumentBuilder builder = builderFactory.newDocumentBuilder();
+
+            Document xmlDocument = builder.parse(this.getFile());
+
+            XPath xPath = XPathFactory.newInstance().newXPath();
+
+            String expression = "/Tutorials/Tutorial[@tutId=" + "'" + id + "'" + "]";
+
+            node = (Node) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODE);
+
+        } catch (SAXException | IOException | ParserConfigurationException | XPathExpressionException e) {
+            e.printStackTrace();
+        }
+        return node;
+    }
+    
+    public NodeList getNodeListByTitle(String name) {
+        NodeList nodeList = null;
+        try {
+            DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
+
+            DocumentBuilder builder = builderFactory.newDocumentBuilder();
+
+            Document xmlDocument = builder.parse(this.getFile());
+
+            this.clean(xmlDocument);
+
+            XPath xPath = XPathFactory.newInstance().newXPath();
+
+            String expression = "//Tutorial[descendant::title[text()=" + "'" + name + "'" + "]]";
+
+            nodeList = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET);
+
+        } catch (SAXException | IOException | ParserConfigurationException | XPathExpressionException e) {
+            e.printStackTrace();
+        }
+        return nodeList;
+    }
+
+    public NodeList getElementsByDate(String date) {
+        NodeList nodeList = null;
+
+        try {
+            DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
+
+            DocumentBuilder builder = builderFactory.newDocumentBuilder();
+
+            Document xmlDocument = builder.parse(this.getFile());
+
+            this.clean(xmlDocument);
+
+            XPath xPath = XPathFactory.newInstance().newXPath();
+
+            String expression = "//Tutorial[number(translate(date, '/', '')) > " + date + "]";
+
+            nodeList = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET);
+
+        } catch (SAXException | IOException | ParserConfigurationException | XPathExpressionException e) {
+            e.printStackTrace();
+        }
+        return nodeList;
+    }
+
+    public NodeList getAllTutorials() {
+        NodeList nodeList = null;
+        try {
+            DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
+            builderFactory.setNamespaceAware(true);
+            DocumentBuilder builder = builderFactory.newDocumentBuilder();
+
+            Document xmlDocument = builder.parse(this.getFile());
+            
+            this.clean(xmlDocument);
+
+            XPath xPath = XPathFactory.newInstance().newXPath();
+            
+            xPath.setNamespaceContext(new NamespaceContext() {
+
+                @Override
+                public Iterator getPrefixes(String arg0) {
+                    return null;
+                }
+
+                @Override
+                public String getPrefix(String arg0) {
+                    return null;
+                }
+
+                @Override
+                public String getNamespaceURI(String arg0) {
+                    if ("bdn".equals(arg0)) {
+                        return "http://www.baeldung.com/full_archive";
+                    }
+                    return null;
+                }
+            });
+
+            String expression = "/bdn:Tutorials/bdn:Tutorial";
+
+            nodeList = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET);
+
+        } catch (SAXException | IOException | ParserConfigurationException | XPathExpressionException e) {
+            e.printStackTrace();
+        }
+        return nodeList;
+    }
+
+    private void clean(Node node) {
+
+        NodeList childs = node.getChildNodes();
+
+        for (int n = childs.getLength() - 1; n >= 0; n--) {
+            Node child = childs.item(n);
+            short nodeType = child.getNodeType();
+
+            if (nodeType == Node.ELEMENT_NODE)
+                clean(child);
+            else if (nodeType == Node.TEXT_NODE) {
+                String trimmedNodeVal = child.getNodeValue().trim();
+                if (trimmedNodeVal.length() == 0)
+                    node.removeChild(child);
+                else
+                    child.setNodeValue(trimmedNodeVal);
+            } else if (nodeType == Node.COMMENT_NODE)
+                node.removeChild(child);
+        }
+    }
+
+    public File getFile() {
+        return file;
+    }
+
+    public void setFile(File file) {
+        this.file = file;
+    }
+
+}
--- a/xml/src/test/java/com/baeldung/xml/DefaultParserTest.java
+++ b/xml/src/test/java/com/baeldung/xml/DefaultParserTest.java
@ -0,0 +1,83 @@
+package com.baeldung.xml;
+
+import static org.junit.Assert.*;
+
+import java.io.File;
+
+import org.junit.Test;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+
+/**
+ * Unit test for simple App.
+ */
+public class DefaultParserTest {
+
+    final String fileName = "src/test/resources/example.xml";
+    
+    final String fileNameSpace = "src/test/resources/example_namespace.xml";
+
+    DefaultParser parser;
+
+    @Test
+    public void getFirstLevelNodeListTest() {
+        parser = new DefaultParser(new File(fileName));
+        NodeList list = parser.getFirstLevelNodeList();
+
+        assertNotNull(list);
+        assertTrue(list.getLength() == 4);
+    }
+
+    @Test
+    public void getNodeListByTitle() {
+        parser = new DefaultParser(new File(fileName));
+        NodeList list = parser.getNodeListByTitle("XML");
+
+        for (int i = 0; null != list && i < list.getLength(); i++) {
+            Node nod = list.item(i);
+            assertEquals("java", nod.getAttributes().getNamedItem("type").getTextContent());
+            assertEquals("02", nod.getAttributes().getNamedItem("tutId").getTextContent());
+            assertEquals("XML", nod.getFirstChild().getTextContent());
+            assertEquals("title", nod.getFirstChild().getNodeName());
+            assertEquals("description", nod.getChildNodes().item(1).getNodeName());
+            assertEquals("Introduction to XPath", nod.getChildNodes().item(1).getTextContent());
+            assertEquals("author", nod.getLastChild().getNodeName());
+            assertEquals("XMLAuthor", nod.getLastChild().getTextContent());
+        }
+    }
+
+    @Test
+    public void getNodeById() {
+        parser = new DefaultParser(new File(fileName));
+        Node node = parser.getNodeById("03");
+
+        String type = node.getAttributes().getNamedItem("type").getNodeValue();
+        assertEquals("android", type);
+    }
+    
+    @Test
+    public void getNodeListByDate(){
+        parser = new DefaultParser(new File(fileName));
+        NodeList list = parser.getNodeListByTitle("04022016");
+        for (int i = 0; null != list && i < list.getLength(); i++) {
+            Node nod = list.item(i);
+            assertEquals("java", nod.getAttributes().getNamedItem("type").getTextContent());
+            assertEquals("04", nod.getAttributes().getNamedItem("tutId").getTextContent());
+            assertEquals("Spring", nod.getFirstChild().getTextContent());
+            assertEquals("title", nod.getFirstChild().getNodeName());
+            assertEquals("description", nod.getChildNodes().item(1).getNodeName());
+            assertEquals("Introduction to Spring", nod.getChildNodes().item(1).getTextContent());
+            assertEquals("author", nod.getLastChild().getNodeName());
+            assertEquals("SpringAuthor", nod.getLastChild().getTextContent());
+        }
+    }
+    
+    @Test
+    public void getNodeListWithNamespace(){
+        parser = new DefaultParser(new File(fileNameSpace));
+        NodeList list = parser.getAllTutorials();
+        assertNotNull(list);
+        assertTrue(list.getLength() == 4);
+    }
+
+}
--- a/xml/src/test/resources/example.xml
+++ b/xml/src/test/resources/example.xml
@ -0,0 +1,32 @@
+<?xml version="1.0"?>
+<Tutorials>
+	<Tutorial tutId="01" type="java">
+		<title>Guava</title>
+		<description>Introduction to Guava</description>
+		<date>04/04/2016</date>
+		<author>GuavaAuthor</author>
+	</Tutorial>
+	<Tutorial tutId="02" type="java">
+		<title>XML</title>
+		<description>Introduction to XPath</description>
+		<date>04/05/2016</date>
+		<author>XMLAuthor</author>
+	</Tutorial>
+	<Tutorial tutId="03" type="android">
+		<title>Android</title>
+		<description>Introduction to Android</description>
+		<date>04/03/2016</date>
+		<author>AndroidAuthor</author>
+	</Tutorial>
+	<Tutorial tutId="04" type="java">
+		<title>Spring</title>
+		<description>Introduction to Spring</description>
+		<date>04/02/2016</date>
+		<author>SpringAuthor</author>
+		<sections>
+			<section name="core">Spring Core</section>
+			<section name="mvc">Spring MVC</section>
+			<section name="batch">Spring Batch</section>
+		</sections>
+	</Tutorial>
+</Tutorials>
--- a/xml/src/test/resources/example_namespace.xml
+++ b/xml/src/test/resources/example_namespace.xml
@ -0,0 +1,32 @@
+<?xml version="1.0"?>
+<Tutorials xmlns="http://www.baeldung.com/full_archive">
+    <Tutorial tutId="01" type="java">
+		<title>Guava</title>
+		<description>Introduction to Guava</description>
+		<date>04/04/2016</date>
+		<author>GuavaAuthor</author>
+	</Tutorial>
+	<Tutorial tutId="02" type="java">
+		<title>XML</title>
+		<description>Introduction to XPath</description>
+		<date>04/05/2016</date>
+		<author>XMLAuthor</author>
+	</Tutorial>
+	<Tutorial tutId="03" type="android">
+		<title>Android</title>
+		<description>Introduction to Android</description>
+		<date>04/03/2016</date>
+		<author>AndroidAuthor</author>
+	</Tutorial>
+	<Tutorial tutId="04" type="java">
+		<title>Spring</title>
+		<description>Introduction to Spring</description>
+		<date>04/02/2016</date>
+		<author>SpringAuthor</author>
+		<sections>
+			<section name="core">Spring Core</section>
+			<section name="mvc">Spring MVC</section>
+			<section name="batch">Spring Batch</section>
+		</sections>
+	</Tutorial>
+</Tutorials>