de.kp.ames.web.core.json.DateCollector.java Source code

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Here is the source code for de.kp.ames.web.core.json.DateCollector.java

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package de.kp.ames.web.core.json;
/**
 * This Java module is part of the
 *  Application Developer Framework
 *
 *  Project: AMES-Web-Service
 *  Package: de.kp.ames.web.core.json
 *  Module: DateCollector
 *  @author krusche@dr-kruscheundpartner.de
 *
 * Add your semantic annotations within the SemanticAssist tags and
 * mark them with a leading hashtag #:
 *
 * <SemanticAssist>
 *     #collector #core #date #json #web
 * </SemanticAssist>
 *
 */

/**
 *   Copyright 2012 Dr. Krusche & Partner PartG
 *
 *   AMES-Web-Service is free software: you can redistribute it and/or 
 *   modify it under the terms of the GNU General Public License 
 *   as published by the Free Software Foundation, either version 3 of 
 *   the License, or (at your option) any later version.
 *
 *   AMES- Web-Service is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 * 
 *  See the GNU General Public License for more details. 
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this software. If not, see <http://www.gnu.org/licenses/>.
 *
 */

import java.util.ArrayList;
import java.util.Comparator;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;

import org.json.JSONObject;

/**
 * A utility class to sort and collect JSON objects by Date;
 * this class is mainly used to provide sorted results to be 
 * returned as a service response
 * 
 * @author Stefan Krusche (krusche@dr-kruscheundpartner.de)
 */

public class DateCollector {

    private Map<Date, ArrayList<JSONObject>> collector;

    public DateCollector() {

        collector = new TreeMap<Date, ArrayList<JSONObject>>(new Comparator<Date>() {
            public int compare(Date date1, Date date2) {
                // this is a descending sorting of two dates
                return (-1) * date1.compareTo(date2);
            }
        });

    }

    /**
     * A helper method to add a JSON object and its 
     * assigned date to this sorter and collector
     * 
     * @param date
     * @param jObject
     */
    public void put(Date date, JSONObject jObject) {

        if (!collector.containsKey(date))
            collector.put(date, new ArrayList<JSONObject>());
        collector.get(date).add(jObject);

    }

    /**
     * A method to return a sorted list of JSON objects
     * 
     * @return
     */
    public ArrayList<JSONObject> values() {

        ArrayList<JSONObject> values = new ArrayList<JSONObject>();

        Iterator<ArrayList<JSONObject>> iterator = collector.values().iterator();
        while (iterator.hasNext()) {
            values.addAll(iterator.next());
        }

        return values;

    }

}