/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2003 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.openide.filesystems;

/**
 * Support class for impl. of FileChangeListener
 * @author  rm111737
 */
class FCLSupport {
    public static final int DATA_CREATED = 0;
    public static final int FOLDER_CREATED = 1;
    public static final int FILE_CHANGED = 2;
    public static final int FILE_DELETED = 3;
    public static final int FILE_RENAMED = 4;
    public static final int ATTR_CHANGED = 5;
    
    /** listeners */
    private ListenerList listeners;
    
    
    /* Add new listener to this object.
    * @param l the listener
    */
    synchronized final void  addFileChangeListener (FileChangeListener fcl) {
        if (listeners == null) {
            listeners = new ListenerList (FileChangeListener.class);
        }
        listeners.add (fcl);
    }

    /* Remove listener from this object.
    * @param l the listener
    */
    synchronized final void removeFileChangeListener (FileChangeListener fcl) {
        if (listeners != null) {
            listeners.remove (fcl);
        }
    }
    
    final void dispatchEvent (FileEvent fe, int operation) {
        Object[] fcls;

        synchronized (this) {
            if (listeners == null) return;
            fcls = listeners.getAllListeners ();
        }

        for (int i = 0; i < fcls.length; i++) {
            if (fcls[i] instanceof FileChangeListener) {
                dispatchEvent ((FileChangeListener)fcls[i], fe, operation);
            }
        }
    }
    
    final static void dispatchEvent (FileChangeListener fcl, FileEvent fe, int operation) {
        switch( operation ) {
            case FCLSupport.DATA_CREATED:
                fcl.fileDataCreated (fe);
                break;
            case FCLSupport.FOLDER_CREATED:
                fcl.fileFolderCreated (fe);
                break;
            case FCLSupport.FILE_CHANGED:
                fcl.fileChanged (fe);
                break;
            case FCLSupport.FILE_DELETED:
                fcl.fileDeleted (fe);
                break;
            case FCLSupport.FILE_RENAMED:
                fcl.fileRenamed ((FileRenameEvent)fe);
                break;
            case FCLSupport.ATTR_CHANGED:
                fcl.fileAttributeChanged ((FileAttributeEvent)fe );
                break;
        }	            
    }
    
    /** @return true if there is a listener
    */
    synchronized final boolean hasListeners () {
        return listeners != null && listeners.getAllListeners ().length != 0;
    }    
    
}