extras/periodic.notification/api/src/main/java/org/apache/rya/periodic/notification/serialization/PeriodicNotificationTypeAdapter.java

/*
 * 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.rya.periodic.notification.serialization;

import java.lang.reflect.Type;
import java.util.concurrent.TimeUnit;

import org.apache.rya.periodic.notification.notification.PeriodicNotification;
import org.apache.rya.periodic.notification.notification.PeriodicNotification.Builder;

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.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

/**
 * {@link TypeAdapter} used to serialize and deserialize {@link PeriodicNotification}s.
 * This TypeAdapter is used in {@link CommandNotificationTypeAdapter} which is used in
 * {@link CommandNotificationSerializer} for producing and consuming messages to and from
 * Kafka.
 *
 */
public class PeriodicNotificationTypeAdapter
        implements JsonSerializer<PeriodicNotification>, JsonDeserializer<PeriodicNotification> {

    @Override
    public PeriodicNotification deserialize(JsonElement arg0, Type arg1, JsonDeserializationContext arg2)
            throws JsonParseException {

        JsonObject json = arg0.getAsJsonObject();
        String id = json.get("id").getAsString();
        long period = json.get("period").getAsLong();
        TimeUnit periodTimeUnit = TimeUnit.valueOf(json.get("timeUnit").getAsString());
        long initialDelay = json.get("initialDelay").getAsLong();
        Builder builder = PeriodicNotification.builder().id(id).period(period)
                .initialDelay(initialDelay).timeUnit(periodTimeUnit);

        return builder.build();
    }

    @Override
    public JsonElement serialize(PeriodicNotification arg0, Type arg1, JsonSerializationContext arg2) {

        JsonObject result = new JsonObject();
        result.add("id", new JsonPrimitive(arg0.getId()));
        result.add("period", new JsonPrimitive(arg0.getPeriod()));
        result.add("initialDelay", new JsonPrimitive(arg0.getInitialDelay()));
        result.add("timeUnit", new JsonPrimitive(arg0.getTimeUnit().name()));

        return result;
    }

}