com.continuuity.loom.codec.json.upgrade.ServiceActionUpgradeCodec.java Source code

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Here is the source code for com.continuuity.loom.codec.json.upgrade.ServiceActionUpgradeCodec.java

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/*
 * 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.upgrade;

import com.continuuity.loom.admin.ServiceAction;
import com.continuuity.loom.codec.json.AbstractCodec;
import com.google.common.collect.Maps;
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 com.google.gson.reflect.TypeToken;

import java.lang.reflect.Type;
import java.util.Map;

/**
 * Codec for serializing/deserializing a {@link com.continuuity.loom.admin.ServiceAction}.
 */
public class ServiceActionUpgradeCodec extends AbstractCodec<ServiceAction> {

    @Override
    public JsonElement serialize(ServiceAction action, Type type, JsonSerializationContext context) {
        JsonObject jsonObj = new JsonObject();

        jsonObj.add("type", context.serialize(action.getType()));
        jsonObj.add("fields", context.serialize(action.getFields()));

        return jsonObj;
    }

    @Override
    public ServiceAction deserialize(JsonElement json, Type type, JsonDeserializationContext context)
            throws JsonParseException {
        JsonObject jsonObj = json.getAsJsonObject();

        String actionType = context.deserialize(jsonObj.get("type"), String.class);
        Map<String, String> fields = context.deserialize(jsonObj.get("fields"),
                new TypeToken<Map<String, String>>() {
                }.getType());
        // For backwards compatibility.
        if (jsonObj.has("script")) {
            if (fields == null) {
                fields = Maps.newHashMap();
            }
            fields.put("script", jsonObj.get("script").getAsString());
        }
        if (jsonObj.has("data")) {
            if (fields == null) {
                fields = Maps.newHashMap();
            }
            fields.put("data", jsonObj.get("data").getAsString());
        }

        return new ServiceAction(actionType, fields);
    }
}