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/*
* ============LICENSE_START=======================================================
* ONAP PAP
* ================================================================================
* 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.utils.coder;
import com.google.gson.Gson;
/**
* JSON encoder and decoder using the "standard" mechanism, which is currently gson.
*/
public class StandardCoder implements Coder {
/**
* Gson object used to encode and decode messages.
*/
private static final Gson GSON = new Gson();
/**
* Constructs the object.
*/
public StandardCoder() {
super();
}
@Override
public String encode(Object object) throws CoderException {
try {
return toJson(object);
} catch (RuntimeException e) {
throw new CoderException(e);
}
}
@Override
public <T> T decode(String json, Class<T> clazz) throws CoderException {
try {
return fromJson(json, clazz);
} catch (RuntimeException e) {
throw new CoderException(e);
}
}
// the remaining methods are wrappers that can be overridden by junit tests
/**
* Encodes an object into json, without catching exceptions.
*
* @param object object to be encoded
* @return a json string representing the object
*/
protected String toJson(Object object) {
return GSON.toJson(object);
}
/**
* Decodes a json string into an object, without catching exceptions.
*
* @param json json string to be decoded
* @param clazz class of object to be decoded
* @return the object represented by the given json string
*/
protected <T> T fromJson(String json, Class<T> clazz) {
return GSON.fromJson(json, clazz);
}
}
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