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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2019 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.onap.policy.common.gson;
import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import org.onap.policy.common.gson.internal.ClassWalker;
import org.onap.policy.common.gson.internal.Deserializer;
import org.onap.policy.common.gson.internal.FieldDeserializer;
import org.onap.policy.common.gson.internal.FieldSerializer;
import org.onap.policy.common.gson.internal.JacksonTypeAdapter;
import org.onap.policy.common.gson.internal.Serializer;
/**
* Factory that serializes/deserializes class fields following the normal behavior of
* jackson. Supports the following annotations:
* <ul>
* <li>GsonJsonIgnore</li>
* <li>GsonJsonProperty</li>
* </ul>
*
* <p>Note: {@link JacksonExclusionStrategy} must also be registered with the gson object.
*/
public class JacksonFieldAdapterFactory implements TypeAdapterFactory {
@Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
Class<? super T> clazz = type.getRawType();
if (!JacksonExclusionStrategy.isManaged(clazz)) {
return null;
}
ClassWalker data = new ClassWalker();
data.walkClassHierarchy(clazz);
if (data.getInProps(Field.class).isEmpty() && data.getOutProps(Field.class).isEmpty()) {
// no fields to serialize
return null;
}
TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
List<Serializer> sers = makeSerializers(gson, data);
List<Deserializer> desers = makeDeserializers(gson, data);
return new JacksonTypeAdapter<>(gson, delegate, sers, desers);
}
/**
* Creates a complete list of serializers.
*
* @param gson the associated gson object
* @param data data used to configure the serializers
* @return a list of all serializers
*/
private List<Serializer> makeSerializers(Gson gson, ClassWalker data) {
List<Serializer> ser = new ArrayList<>();
data.getOutProps(Field.class).forEach(field -> ser.add(new FieldSerializer(gson, field)));
return ser;
}
/**
* Creates a complete list of deserializers.
*
* @param gson the associated gson object
* @param data data used to configure the deserializers
* @return a list of all deserializers
*/
private List<Deserializer> makeDeserializers(Gson gson, ClassWalker data) {
List<Deserializer> deser = new ArrayList<>();
data.getInProps(Field.class).forEach(field -> deser.add(new FieldDeserializer(gson, field)));
return deser;
}
}
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