org.springframework.security.oauth2.client.jackson2.UnmodifiableMapDeserializer Maven / Gradle / Ivy
/*
* Copyright 2002-2020 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.oauth2.client.jackson2;
import java.io.IOException;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
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;
/**
* A {@code JsonDeserializer} for {@link Collections#unmodifiableMap(Map)}.
*
* @author Joe Grandja
* @since 5.3
* @see Collections#unmodifiableMap(Map)
* @see UnmodifiableMapMixin
*/
final class UnmodifiableMapDeserializer extends JsonDeserializer> {
@Override
public Map deserialize(JsonParser parser, DeserializationContext context) throws IOException {
ObjectMapper mapper = (ObjectMapper) parser.getCodec();
JsonNode mapNode = mapper.readTree(parser);
Map result = new LinkedHashMap<>();
if (mapNode != null && mapNode.isObject()) {
Iterable> fields = mapNode::fields;
for (Map.Entry field : fields) {
result.put(field.getKey(), mapper.readValue(field.getValue().traverse(mapper), Object.class));
}
}
return Collections.unmodifiableMap(result);
}
}