Java tutorial
/* * Copyright 2012-2014, Continuuity, Inc. * * 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. */ package com.continuuity.loom.codec.json.current; import com.continuuity.loom.admin.LayoutConstraint; import com.continuuity.loom.codec.json.AbstractCodec; import com.google.common.reflect.TypeToken; import com.google.gson.JsonDeserializationContext; import com.google.gson.JsonElement; import com.google.gson.JsonObject; import com.google.gson.JsonParseException; import com.google.gson.JsonSerializationContext; import java.lang.reflect.Type; import java.util.Set; /** * Codec for serializing/deserializing a {@link LayoutConstraint}. */ public class LayoutConstraintCodec extends AbstractCodec<LayoutConstraint> { @Override public JsonElement serialize(LayoutConstraint layoutConstraint, Type type, JsonSerializationContext context) { JsonObject jsonObj = new JsonObject(); jsonObj.add("mustcoexist", context.serialize(layoutConstraint.getServicesThatMustCoexist())); jsonObj.add("cantcoexist", context.serialize(layoutConstraint.getServicesThatMustNotCoexist())); return jsonObj; } @Override public LayoutConstraint deserialize(JsonElement json, Type type, JsonDeserializationContext context) throws JsonParseException { JsonObject jsonObj = json.getAsJsonObject(); Set<Set<String>> servicesThatMustCoexist = context.deserialize(jsonObj.get("mustcoexist"), new TypeToken<Set<Set<String>>>() { }.getType()); Set<Set<String>> servicesThatMustNotCoexist = context.deserialize(jsonObj.get("cantcoexist"), new TypeToken<Set<Set<String>>>() { }.getType()); return new LayoutConstraint(servicesThatMustCoexist, servicesThatMustNotCoexist); } }