com.continuuity.weave.internal.json.WeaveSpecificationCodec.java Source code

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Here is the source code for com.continuuity.weave.internal.json.WeaveSpecificationCodec.java

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/*
 * Copyright 2012-2013 Continuuity,Inc. 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.
 */
package com.continuuity.weave.internal.json;

import com.continuuity.weave.api.RuntimeSpecification;
import com.continuuity.weave.api.WeaveSpecification;
import com.continuuity.weave.internal.DefaultWeaveSpecification;
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 java.lang.reflect.Type;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * An implementation of gson serializer/deserializer {@link WeaveSpecification}.
 */
final class WeaveSpecificationCodec
        implements JsonSerializer<WeaveSpecification>, JsonDeserializer<WeaveSpecification> {

    @Override
    public JsonElement serialize(WeaveSpecification 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<WeaveSpecification.Order>>() {
        }.getType()));

        return json;
    }

    @Override
    public WeaveSpecification 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<WeaveSpecification.Order> orders = context.deserialize(jsonObj.get("orders"),
                new TypeToken<List<WeaveSpecification.Order>>() {
                }.getType());

        return new DefaultWeaveSpecification(name, runnables, orders);
    }

    static final class WeaveSpecificationOrderCoder
            implements JsonSerializer<WeaveSpecification.Order>, JsonDeserializer<WeaveSpecification.Order> {

        @Override
        public JsonElement serialize(WeaveSpecification.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 WeaveSpecification.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());
            WeaveSpecification.Order.Type type = WeaveSpecification.Order.Type
                    .valueOf(jsonObj.get("type").getAsString());

            return new DefaultWeaveSpecification.DefaultOrder(names, type);
        }
    }
}