spring security UnmodifiableListDeserializer 源码
spring security UnmodifiableListDeserializer 代码
文件路径：/core/src/main/java/org/springframework/security/jackson2/UnmodifiableListDeserializer.java
/*
* Copyright 2002-2018 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 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}.
*
* @author Rob Winch
* @since 5.0.2
* @see UnmodifiableListMixin
*/
class UnmodifiableListDeserializer extends JsonDeserializer<List> {
@Override
public List deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
ObjectMapper mapper = (ObjectMapper) jp.getCodec();
JsonNode node = mapper.readTree(jp);
List<Object> result = new ArrayList<>();
if (node != null) {
if (node instanceof ArrayNode) {
ArrayNode arrayNode = (ArrayNode) node;
for (JsonNode elementNode : arrayNode) {
result.add(mapper.readValue(elementNode.traverse(mapper), Object.class));
}
}
else {
result.add(mapper.readValue(node.traverse(mapper), Object.class));
}
}
return Collections.unmodifiableList(result);
}
}
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