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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.Method;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.onap.policy.common.gson.internal.AnyGetterSerializer;
import org.onap.policy.common.gson.internal.AnySetterDeserializer;
import org.onap.policy.common.gson.internal.ClassWalker;
import org.onap.policy.common.gson.internal.Deserializer;
import org.onap.policy.common.gson.internal.JacksonTypeAdapter;
import org.onap.policy.common.gson.internal.MethodDeserializer;
import org.onap.policy.common.gson.internal.MethodSerializer;
import org.onap.policy.common.gson.internal.Serializer;
/**
* Factory that serializes/deserializes class methods following the normal behavior of
* jackson. Supports the following annotations:
* <ul>
* <li>GsonJsonIgnore</li>
* <li>GsonJsonProperty</li>
* <li>GsonJsonAnyGetter</li>
* <li>GsonJsonAnySetter</li>
* </ul>
*/
public class JacksonMethodAdapterFactory 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(Method.class).isEmpty() && data.getOutProps(Method.class).isEmpty()
&& data.getAnyGetter() == null && data.getAnySetter() == null) {
// no methods to serialize
return null;
}
Set<String> unliftedProps = new HashSet<>();
unliftedProps.addAll(data.getInNotIgnored());
unliftedProps.addAll(data.getOutNotIgnored());
TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
List<Serializer> sers = makeSerializers(gson, data, unliftedProps);
List<Deserializer> desers = makeDeserializers(gson, data, unliftedProps);
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
* @param unliftedProps properties that should not be lowered by "any-getters"
* @return a list of all serializers
*/
private List<Serializer> makeSerializers(Gson gson, ClassWalker data, Set<String> unliftedProps) {
List<Serializer> ser = new ArrayList<>();
if (data.getAnyGetter() != null) {
ser.add(new AnyGetterSerializer(gson, unliftedProps, data.getAnyGetter()));
}
data.getOutProps(Method.class).forEach(method -> ser.add(new MethodSerializer(gson, method)));
return ser;
}
/**
* Creates a complete list of deserializers.
*
* @param gson the associated gson object
* @param data data used to configure the deserializers
* @param unliftedProps properties that should not be lifted by "any-setters"
* @return a list of all deserializers
*/
private List<Deserializer> makeDeserializers(Gson gson, ClassWalker data, Set<String> unliftedProps) {
List<Deserializer> deser = new ArrayList<>();
if (data.getAnySetter() != null) {
deser.add(new AnySetterDeserializer(gson, unliftedProps, data.getAnySetter()));
}
data.getInProps(Method.class).forEach(method -> deser.add(new MethodDeserializer(gson, method)));
return deser;
}
}
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