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/*-
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 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.utils.coder;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import java.io.Reader;
import java.io.Writer;
import java.time.Instant;
import lombok.AccessLevel;
import lombok.Getter;
import org.onap.policy.common.gson.GsonMessageBodyHandler;
import org.onap.policy.common.gson.InstantAsMillisTypeAdapter;
/**
* JSON encoder and decoder using the "standard" mechanism, but encodes Instant fields as
* Long milliseconds.
*/
public class StandardCoderInstantAsMillis extends StandardCoder {
/**
* Gson object used to encode and decode messages.
*/
@Getter(AccessLevel.PROTECTED)
private static final Gson GSON;
/**
* Gson object used to encode messages in "pretty" format.
*/
@Getter(AccessLevel.PROTECTED)
private static final Gson GSON_PRETTY;
static {
GsonBuilder builder = GsonMessageBodyHandler
.configBuilder(new GsonBuilder().registerTypeAdapter(StandardCoderObject.class,
new StandardTypeAdapter()))
.registerTypeAdapter(Instant.class, new InstantAsMillisTypeAdapter());
GSON = builder.create();
GSON_PRETTY = builder.setPrettyPrinting().create();
}
/**
* Constructs the object.
*/
public StandardCoderInstantAsMillis() {
super();
}
@Override
protected String toPrettyJson(Object object) {
return GSON_PRETTY.toJson(object);
}
@Override
public StandardCoderObject toStandard(Object object) throws CoderException {
try {
return new StandardCoderObject(GSON.toJsonTree(object));
} catch (RuntimeException e) {
throw new CoderException(e);
}
}
@Override
public <T> T fromStandard(StandardCoderObject sco, Class<T> clazz) throws CoderException {
try {
return GSON.fromJson(sco.getData(), clazz);
} catch (RuntimeException e) {
throw new CoderException(e);
}
}
// the remaining methods are wrappers that can be overridden by junit tests
@Override
protected JsonElement toJsonTree(Object object) {
return GSON.toJsonTree(object);
}
@Override
protected String toJson(Object object) {
return GSON.toJson(object);
}
@Override
protected void toJson(Writer target, Object object) {
GSON.toJson(object, object.getClass(), target);
}
@Override
protected <T> T fromJson(JsonElement json, Class<T> clazz) {
return convertFromDouble(clazz, GSON.fromJson(json, clazz));
}
@Override
protected <T> T fromJson(String json, Class<T> clazz) {
return convertFromDouble(clazz, GSON.fromJson(json, clazz));
}
@Override
protected <T> T fromJson(Reader source, Class<T> clazz) {
return convertFromDouble(clazz, GSON.fromJson(source, clazz));
}
}
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