/*
 *                 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 1997-2004 Sun
 * Microsystems, Inc. All Rights Reserved.
 */
package org.netbeans.modules.javacore.internalapi;

import java.util.ArrayList;
import java.util.Iterator;
import org.openide.ErrorManager;

/**
 * @author Martin Matula, Jan Becicka
 */
public final class ProgressSupport {
    /** Utility field holding list of ProgressListeners. */
    private transient ArrayList progressListenerList = null;
    
    
    public ProgressSupport() {
        progressListenerList = new ArrayList();
    }
    public synchronized void addProgressListener(ProgressListener listener) {
        progressListenerList.add(listener);
    }
    
    /** Removes ProgressListener from the list of listeners.
     * @param listener The listener to remove.
     *
     */
    public synchronized void removeProgressListener(ProgressListener listener) {
        progressListenerList.remove(listener);
    }
    
    /** Notifies all registered listeners about the event.
     *
     * @param type Type of operation that is starting.
     * @param count Number of steps the operation consists of.
     *
     */
    public void fireProgressListenerStart(int type, int count) {
        ArrayList list;
        ProgressEvent event = new ProgressEvent(this, ProgressEvent.START, type, count);
        synchronized (this) {
            list = (ArrayList) progressListenerList.clone();
        }
        for (Iterator it = list.iterator(); it.hasNext();) {
            try {
                ((ProgressListener) it.next()).start(event);
            } catch (RuntimeException e) {
                ErrorManager.getDefault().notify(ErrorManager.INFORMATIONAL, e);
            }
        }
    }
    
    /** Notifies all registered listeners about the event.
     */
    public void fireProgressListenerStep(int count) {
        ArrayList list;
        ProgressEvent event = new ProgressEvent(this, ProgressEvent.STEP, 0, count);
        synchronized (this) {
            list = (ArrayList) progressListenerList.clone();
        }
        for (Iterator it = list.iterator(); it.hasNext();) {
            try {
                ((ProgressListener) it.next()).step(event);
            } catch (RuntimeException e) {
                ErrorManager.getDefault().notify(ErrorManager.INFORMATIONAL, e);
            }
        }
    }
      /** Notifies all registered listeners about the event.
     */
    public void fireProgressListenerStep() {
         fireProgressListenerStep(1);
    }
    /** Notifies all registered listeners about the event.
     */
    public void fireProgressListenerStop() {
        ArrayList list;
        ProgressEvent event = new ProgressEvent(this, ProgressEvent.STOP);
        synchronized (this) {
            list = (ArrayList) progressListenerList.clone();
        }
        for (Iterator it = list.iterator(); it.hasNext();) {
            try {
                ((ProgressListener) it.next()).stop(event);
            } catch (RuntimeException e) {
                ErrorManager.getDefault().notify(ErrorManager.INFORMATIONAL, e);
            }
        }
    }
}