com.continuuity.loom.codec.json.current.ConstraintsCodec.java Source code

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Here is the source code for com.continuuity.loom.codec.json.current.ConstraintsCodec.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.current;

import com.continuuity.loom.admin.Constraints;
import com.continuuity.loom.admin.LayoutConstraint;
import com.continuuity.loom.admin.ServiceConstraint;
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.Map;

/**
 * Codec for serializing/deserializing a {@link Constraints}.
 */
public class ConstraintsCodec extends AbstractCodec<Constraints> {

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

        jsonObj.add("layout", context.serialize(constraints.getLayoutConstraint(), LayoutConstraint.class));
        jsonObj.add("services", context.serialize(constraints.getServiceConstraints()));

        return jsonObj;
    }

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

        LayoutConstraint layoutConstraint = context.deserialize(jsonObj.get("layout"), LayoutConstraint.class);
        Map<String, ServiceConstraint> serviceConstraints = context.deserialize(jsonObj.get("services"),
                new TypeToken<Map<String, ServiceConstraint>>() {
                }.getType());

        return new Constraints(serviceConstraints, layoutConstraint);
    }
}