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/*-
* ============LICENSE_START=======================================================
* ONAP - SO
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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
*
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.mso.utils;
import java.io.IOException;
import java.util.Map;
import com.fasterxml.jackson.annotation.JsonRootName;
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;
/**
* A JSON deserializer that ignores the root element if it is present.
*/
public class RootIgnoringJsonDeserializer<T> extends JsonDeserializer<T> {
private final ObjectMapper mapper = new ObjectMapper();
private final Class<T> clazz;
private final String jsonRootName;
public RootIgnoringJsonDeserializer(Class<T> clazz) {
this.clazz = clazz;
JsonRootName annotation = clazz.getAnnotation(JsonRootName.class);
if (annotation == null || annotation.value() == null || annotation.value().equals("")) {
jsonRootName = clazz.getSimpleName();
} else {
jsonRootName = annotation.value();
}
}
@Override
public T deserialize(JsonParser jp, DeserializationContext dc)
throws IOException, JsonProcessingException {
JsonNode rootNode = jp.getCodec().readTree(jp);
Map.Entry<String,JsonNode> field = rootNode.fields().next();
if (jsonRootName.equals(field.getKey())) {
rootNode = field.getValue();
}
return mapper.convertValue(rootNode, clazz);
}
}
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