FeedGenerator.java

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014 México Abierto
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * For more information visit https://github.com/mxabierto/avisos.
*/
package mx.org.cedn.avisosconagua.engine;

import com.google.publicalerts.cap.Alert;
import java.util.ArrayList;
import java.util.Date;
import mx.org.cedn.avisosconagua.mongo.CAPGenerator;
import mx.org.cedn.avisosconagua.mongo.MongoInterface;

/**
 * Utility class to generate an ATOM 1.0 Feed using Google's CAP Library.
 * @author Hasdai Pacheco
 */
public class FeedGenerator {
    /** An object instance from the FeedWriter implementation **/
    private final FeedWriter feedWriter;
    /** Mongo interface object to gather information from MongoDB **/
    private static final MongoInterface mi = MongoInterface.getInstance();

    /**
     * Constructor. Creates a new instance of a FeedGenerator using default settings for CONAGUA.
     */
    public FeedGenerator() {
        feedWriter = new FeedWriter("atom_1.0", "Alertas por ciclones tropicales", "Comisión Nacional del Agua");
        feedWriter.setPubDate(new Date(System.currentTimeMillis()));
    }
    
    /**
     * Constructor. Creates a new instance of a FeedGenerator using the provided information.
     * @param feedType code for the feed type (atom_1.0, atom_2.0, RSS)
     * @param feedTitle title for the feed
     * @param feedAuthor author of the feed
     */
    public FeedGenerator(String feedType, String feedTitle, String feedAuthor) {
        feedWriter = new FeedWriter("atom_1.0", "Alertas por ciclones tropicales", "Comisión Nacional del Agua");
        feedWriter.setPubDate(new Date(System.currentTimeMillis()));
    }
    
    /**
     * Generates the XML feed.
     * @return String containing the XMl generated for the feed.
     */
    public String generateXML() {
        ArrayList<String> alertIds = mi.listPublishedHurricanes(10);
        for(String id : alertIds) {
            CAPGenerator gen = new CAPGenerator(id);
            Alert alert = gen.generateAlert();
            feedWriter.addAlert(alert);
        }
        
        return feedWriter.getXML();
    }
}