/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.twill.internal.json;
import com.google.common.reflect.TypeToken;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import org.apache.twill.api.EventHandlerSpecification;
import org.apache.twill.api.RuntimeSpecification;
import org.apache.twill.api.TwillSpecification;
import org.apache.twill.internal.DefaultEventHandlerSpecification;
import org.apache.twill.internal.DefaultTwillSpecification;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* An implementation of gson serializer/deserializer {@link org.apache.twill.api.TwillSpecification}.
*/
final class TwillSpecificationCodec implements JsonSerializer<TwillSpecification>,
JsonDeserializer<TwillSpecification> {
@Override
public JsonElement serialize(TwillSpecification src, Type typeOfSrc, JsonSerializationContext context) {
JsonObject json = new JsonObject();
json.addProperty("name", src.getName());
json.add("runnables", context.serialize(src.getRunnables(),
new TypeToken<Map<String, RuntimeSpecification>>() { }.getType()));
json.add("orders", context.serialize(src.getOrders(),
new TypeToken<List<TwillSpecification.Order>>() { }.getType()));
EventHandlerSpecification eventHandler = src.getEventHandler();
if (eventHandler != null) {
json.add("handler", context.serialize(eventHandler, EventHandlerSpecification.class));
}
return json;
}
@Override
public TwillSpecification deserialize(JsonElement json, Type typeOfT,
JsonDeserializationContext context) throws JsonParseException {
JsonObject jsonObj = json.getAsJsonObject();
String name = jsonObj.get("name").getAsString();
Map<String, RuntimeSpecification> runnables = context.deserialize(
jsonObj.get("runnables"), new TypeToken<Map<String, RuntimeSpecification>>() { }.getType());
List<TwillSpecification.Order> orders = context.deserialize(
jsonObj.get("orders"), new TypeToken<List<TwillSpecification.Order>>() { }.getType());
JsonElement handler = jsonObj.get("handler");
EventHandlerSpecification eventHandler = null;
if (handler != null && !handler.isJsonNull()) {
eventHandler = context.deserialize(handler, EventHandlerSpecification.class);
}
return new DefaultTwillSpecification(name, runnables, orders, eventHandler);
}
static final class TwillSpecificationOrderCoder implements JsonSerializer<TwillSpecification.Order>,
JsonDeserializer<TwillSpecification.Order> {
@Override
public JsonElement serialize(TwillSpecification.Order src, Type typeOfSrc, JsonSerializationContext context) {
JsonObject json = new JsonObject();
json.add("names", context.serialize(src.getNames(), new TypeToken<Set<String>>() { }.getType()));
json.addProperty("type", src.getType().name());
return json;
}
@Override
public TwillSpecification.Order deserialize(JsonElement json, Type typeOfT,
JsonDeserializationContext context) throws JsonParseException {
JsonObject jsonObj = json.getAsJsonObject();
Set<String> names = context.deserialize(jsonObj.get("names"), new TypeToken<Set<String>>() { }.getType());
TwillSpecification.Order.Type type = TwillSpecification.Order.Type.valueOf(jsonObj.get("type").getAsString());
return new DefaultTwillSpecification.DefaultOrder(names, type);
}
}
static final class EventHandlerSpecificationCoder implements JsonSerializer<EventHandlerSpecification>,
JsonDeserializer<EventHandlerSpecification> {
@Override
public JsonElement serialize(EventHandlerSpecification src, Type typeOfSrc, JsonSerializationContext context) {
JsonObject json = new JsonObject();
json.addProperty("classname", src.getClassName());
json.add("configs", context.serialize(src.getConfigs(), new TypeToken<Map<String, String>>() { }.getType()));
return json;
}
@Override
public EventHandlerSpecification deserialize(JsonElement json, Type typeOfT,
JsonDeserializationContext context) throws JsonParseException {
JsonObject jsonObj = json.getAsJsonObject();
String className = jsonObj.get("classname").getAsString();
Map<String, String> configs = context.deserialize(jsonObj.get("configs"),
new TypeToken<Map<String, String>>() {
}.getType());
return new DefaultEventHandlerSpecification(className, configs);
}
}
}