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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.Field;
/**
* De-serializer for fields that are exposed.
*/
public class FieldDeserializer extends Adapter implements Deserializer {
public static final String SET_ERR = "cannot set field: ";
/**
* Field within the object.
*/
private final Field field;
/**
* Constructs the object.
*
* @param gson Gson object providing type adapters
* @param field field within the object
*/
public FieldDeserializer(Gson gson, Field field) {
super(gson, field);
this.field = field;
field.setAccessible(true);
}
@Override
public void getFromTree(JsonObject source, Object target) {
JsonElement jsonEl = source.get(getPropName());
if (jsonEl == null || jsonEl.isJsonNull()) {
return;
}
Object value = fromJsonTree(jsonEl);
try {
field.set(target, value);
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new JsonParseException(makeError(SET_ERR), e);
}
}
}
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