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Abstract Jackson2 Set and List Deserializers

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hyunmin0317 2024-08-22 22:45:47 +09:00 committed by Josh Cummings
parent 2dc787a573
commit fee79ccb51
3 changed files with 92 additions and 45 deletions
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77
core/src/main/java/org/springframework/security/jackson2/AbstractUnmodifiableCollectionDeserializer.java Normal file
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@ -0,0 +1,77 @@
/*
* Copyright 2024 the original author or authors.
*
* Licensed 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
*
* https://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 org.springframework.security.jackson2;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.Set;
/**
* Abstract base class for deserializers that create unmodifiable collections from JSON data.
* Subclasses like {@link UnmodifiableListDeserializer} and
* {@link UnmodifiableSetDeserializer} should implement the method to define the
* specific collection type and handle the deserialization logic.
*
* @param <T> the type of the unmodifiable collection, such as {@link List} or {@link Set}.
* @author Hyunmin Choi
*/
abstract class AbstractUnmodifiableCollectionDeserializer<T> extends JsonDeserializer<T> {
@Override
public T deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
ObjectMapper mapper = (ObjectMapper) jp.getCodec();
JsonNode node = mapper.readTree(jp);
return createUnmodifiableCollection(node, mapper);
}
/**
* Creates an unmodifiable collection from the given JSON node.
*
* @param node the JSON node containing the data to be deserialized.
* @param mapper the {@link ObjectMapper} used to deserialize JSON data.
* @return an unmodifiable collection with the deserialized elements.
* @throws IOException if an error occurs during deserialization.
*/
protected abstract T createUnmodifiableCollection(JsonNode node, ObjectMapper mapper) throws IOException;
/**
* Adds elements from the JSON node to the provided collection.
*
* @param node the JSON node containing the elements to add.
* @param mapper the {@link ObjectMapper} used for deserialization.
* @param collection the collection to which elements are added.
* @throws IOException if an error occurs during deserialization.
*/
protected void addElements(JsonNode node, ObjectMapper mapper, Collection<Object> collection) throws IOException {
if (node instanceof ArrayNode arrayNode) {
for (JsonNode elementNode : arrayNode) {
collection.add(mapper.readValue(elementNode.traverse(mapper), Object.class));
}
} else if (node != null) {
collection.add(mapper.readValue(node.traverse(mapper), Object.class));
}
}
}

31
core/src/main/java/org/springframework/security/jackson2/UnmodifiableListDeserializer.java
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@ -16,43 +16,28 @@
package org.springframework.security.jackson2;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
/**
* Custom deserializer for {@link UnmodifiableListDeserializer}.
* Custom deserializer for {@link UnmodifiableListMixin}.
*
* @author Rob Winch
* @author Hyunmin Choi
* @since 5.0.2
* @see UnmodifiableListMixin
*/
class UnmodifiableListDeserializer extends JsonDeserializer<List> {
class UnmodifiableListDeserializer extends AbstractUnmodifiableCollectionDeserializer<List> {
@Override
public List deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
ObjectMapper mapper = (ObjectMapper) jp.getCodec();
JsonNode node = mapper.readTree(jp);
protected List createUnmodifiableCollection(JsonNode node, ObjectMapper mapper) throws IOException {
List<Object> result = new ArrayList<>();
if (node != null) {
if (node instanceof ArrayNode arrayNode) {
for (JsonNode elementNode : arrayNode) {
result.add(mapper.readValue(elementNode.traverse(mapper), Object.class));
}
}
else {
result.add(mapper.readValue(node.traverse(mapper), Object.class));
}
}
addElements(node, mapper, result);
return Collections.unmodifiableList(result);
}

29
core/src/main/java/org/springframework/security/jackson2/UnmodifiableSetDeserializer.java
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@ -16,43 +16,28 @@
package org.springframework.security.jackson2;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
/**
* Custom deserializer for {@link UnmodifiableSetMixin}.
*
* @author Jitendra Singh
* @author Hyunmin Choi
* @since 4.2
* @see UnmodifiableSetMixin
*/
class UnmodifiableSetDeserializer extends JsonDeserializer<Set> {
class UnmodifiableSetDeserializer extends AbstractUnmodifiableCollectionDeserializer<Set> {
@Override
public Set deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
ObjectMapper mapper = (ObjectMapper) jp.getCodec();
JsonNode node = mapper.readTree(jp);
protected Set createUnmodifiableCollection(JsonNode node, ObjectMapper mapper) throws IOException {
Set<Object> resultSet = new HashSet<>();
if (node != null) {
if (node instanceof ArrayNode arrayNode) {
for (JsonNode elementNode : arrayNode) {
resultSet.add(mapper.readValue(elementNode.traverse(mapper), Object.class));
}
}
else {
resultSet.add(mapper.readValue(node.traverse(mapper), Object.class));
}
}
addElements(node, mapper, resultSet);
return Collections.unmodifiableSet(resultSet);
}