AirTrafficPusherCallback.java

/*
 * Copyright 2012 GitHub 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.github.mobile.gauges.ui.airtraffic;

import static org.json.JSONObject.NULL;

import com.emorym.android_pusher.PusherCallback;

import org.json.JSONObject;

/**
 * Callback that delivers pushed air traffic events to an implemented {@link #onHit(Hit)} callback
 */
public abstract class AirTrafficPusherCallback extends PusherCallback {

    /**
     * Process hit
     *
     * @param hit
     */
    protected abstract void onHit(final Hit hit);

    /**
     * Get the value of the key as a {@link String}
     *
     * @param data
     * @param key
     * @return value, may be null
     */
    protected String getString(final JSONObject data, final String key) {
        final Object value = data.opt(key);
        return value != null && value != NULL ? value.toString() : null;
    }

    @Override
    public void onEvent(final JSONObject eventData) {
        double longitude = eventData.optDouble("longitude");
        if (Double.isNaN(longitude))
            return;
        double latitude = eventData.optDouble("latitude");
        if (Double.isNaN(latitude))
            return;

        String id = getString(eventData, "site_id");
        if (id == null || id.length() == 0)
            return;

        String city = getString(eventData, "city");
        String region = getString(eventData, "region");
        String country = getString(eventData, "country");
        String title = getString(eventData, "title");
        onHit(new Hit(id, title, (float) longitude, (float) latitude, city, region, country));
    }
}