source: osm/applications/editors/josm/plugins/openstreetbugs/src/org/openstreetmap/josm/plugins/osb/OsbDownloadLoop.java@ 12588

/* Copyright (c) 2008, Henrik Niehaus
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice, 
 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its 
 *    contributors may be used to endorse or promote products derived from this 
 *    software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package org.openstreetmap.josm.plugins.osb;

import static org.openstreetmap.josm.tools.I18n.tr;

import java.awt.geom.Point2D;
import java.util.concurrent.TimeUnit;

import org.openstreetmap.josm.Main;

public class OsbDownloadLoop extends Thread {
        
        private static OsbDownloadLoop instance;
        
        private long countdown = TimeUnit.SECONDS.toMillis(1);
        
        private boolean downloadDone = false;
        
        private final int INTERVAL = 100;
        
        private OsbPlugin plugin;
        
        private Point2D lastCenter;
        
        public OsbDownloadLoop() {
            setName(tr("OpenStreetBugs download loop"));
                start();
        }
        
        public static synchronized OsbDownloadLoop getInstance() {
                if(instance == null) {
                        instance = new OsbDownloadLoop();
                }
                return instance;
        }
        
        @Override
        public void run() {
                try {
                        while(true) {
                                countdown -= INTERVAL;
                                
                                // if the center of the map has changed, the user has dragged or
                                // zoomed the map
                                if(Main.map != null && Main.map.mapView != null) {
                                        Point2D currentCenter = Main.map.mapView.getCenter();
                                        if(currentCenter != null && !currentCenter.equals(lastCenter)) {
                                                resetCountdown();
                                                lastCenter = currentCenter;
                                        }
                                }
                                
                                // auto download if configured
                                if( Main.pref.getBoolean(ConfigKeys.OSB_AUTO_DOWNLOAD) && OsbPlugin.active ) {
                                        if(countdown < 0) {
                                                if(!downloadDone) {
                                                        if(plugin != null) {
                                                                plugin.updateData();
                                                                downloadDone = true;
                                                        }
                                                } else {
                                                        countdown = -1;
                                                }
                                        }
                                }
                                
                                Thread.sleep(INTERVAL);
                        }
                } catch (InterruptedException e) {
                        e.printStackTrace();
                }
        }
        
        public void resetCountdown() {
                downloadDone = false;
                countdown = TimeUnit.SECONDS.toMillis(1);
        }

        public void setPlugin(OsbPlugin plugin) {
                this.plugin = plugin;
        }
}