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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2019-2020 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.JsonNull;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import java.lang.reflect.Field;
/**
* Serializer for fields that are exposed.
*/
public class FieldSerializer extends Adapter implements Serializer {
public static final String GET_ERR = "cannot get 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 FieldSerializer(Gson gson, Field field) {
super(gson, field);
this.field = field;
/*
* Turning off sonar, as this is required for emulation of "jackson".
*/
field.setAccessible(true); // NOSONAR
}
@Override
public void addToTree(Object source, JsonObject target) {
Object value;
try {
value = getFromObject(source);
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new JsonParseException(makeError(GET_ERR), e);
}
JsonElement jsonEl = (value == null ? JsonNull.INSTANCE : toJsonTree(value));
target.add(getPropName(), jsonEl);
}
/**
* Gets the field from the source object. Overridden during junit testing.
*
* @param source object containing the field
* @return the field's value
* @throws IllegalAccessException if an error occurs
*/
protected Object getFromObject(Object source) throws IllegalAccessException {
return field.get(source);
}
}
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