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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.internal;
import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import java.lang.reflect.Method;
import java.util.Map.Entry;
import java.util.Set;
/**
* Serializer for methods having a JsonAnyGetter annotation.
*/
public class AnyGetterSerializer extends Lifter implements Serializer {
public static final String NOT_AN_OBJECT_ERR = "expecting a JsonObject for ";
/**
* Constructs the object.
*
* @param gson Gson object providing type adapters
* @param unliftedProps property names that should not be lifted
* @param getter method used to get the item from within an object
*/
public AnyGetterSerializer(Gson gson, Set<String> unliftedProps, Method getter) {
super(gson, unliftedProps, getter, getter.getGenericReturnType());
}
@Override
public void addToTree(Object source, JsonObject target) {
// get the value from the object
Object value = invoke(source);
if (value == null) {
// nothing to lift
return;
}
JsonElement inner = toJsonTree(value);
if (!inner.isJsonObject()) {
throw new JsonParseException(makeError(NOT_AN_OBJECT_ERR));
}
// lift items from inner into the target
copyLiftedItems(inner.getAsJsonObject(), target);
}
/**
* Copies lifted items from one tree into another, without removing them from the
* source tree.
*
* @param source tree from which items are to be copied
* @param target tree into which items are to be copied
*/
private void copyLiftedItems(JsonObject source, JsonObject target) {
for (Entry<String, JsonElement> ent : source.entrySet()) {
String name = ent.getKey();
if (shouldLift(name)) {
target.add(name, ent.getValue());
}
}
}
}
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