org.exist.netedit.Listener.java Source code

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Here is the source code for org.exist.netedit.Listener.java

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/*
 *  eXist Open Source Native XML Database
 *  Copyright (C) 2010 The eXist Project
 *  http://exist-db.org
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program 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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *  $Id$
 */

package org.exist.netedit;

import java.io.File;
import java.io.IOException;
import java.util.TimerTask;

import org.apache.commons.httpclient.HttpException;

/**
 * @author Evgeny Gazdovsky (gazdovsky@gmail.com)
 */
public class Listener extends TimerTask {

    private long lastModified; // time of last file change
    private Task task; // listened task 
    private File file; // listened file
    private NetEditApplet netEdit;

    /**
     * Create a listener for task
     * @param task listened task
     * @param netEdit NetEditApplet
     */
    public Listener(Task task, NetEditApplet netEdit) {
        this.netEdit = netEdit;
        this.task = task;
        this.file = task.getFile();
        this.lastModified = file.lastModified();
    }

    /**
     * Create a listener for task, used for task loaded from FS
     * @param task listened task
     * @param netEdit NetEditApplet
     * @param lastModified time of last task modification, stored in XML description of task 
     */
    public Listener(Task task, NetEditApplet netEdit, long lastModified) {
        this.netEdit = netEdit;
        this.task = task;
        this.file = task.getFile();
        this.lastModified = lastModified;
    }

    private boolean isModified() {
        return file.lastModified() > this.lastModified;
    }

    /**
     * Listen task's file changes, upload file to server 
     * and store task description on local FS   
     */
    public void run() {
        if (isModified()) {
            this.lastModified = file.lastModified();
            try {
                netEdit.upload(file, task.getUploadTo());
                task.store();
            } catch (HttpException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}