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Rich Internet Application Framework for GWT

There is a newer version: 2.3.1-gwt22

/*
 * Sencha GXT 2.3.1 - Sencha for GWT
 * Copyright(c) 2007-2013, Sencha, Inc.
 * [email protected]
 * 
 * http://www.sencha.com/products/gxt/license/
 */
 package com.extjs.gxt.ui.client.data;

import java.util.ArrayList;
import java.util.List;

/**
 * Default implementation of the ChangeEventSource interface.
 */
public class ChangeEventSupport implements ChangeEventSource {

  protected List listeners;
  protected boolean silent;

  public void addChangeListener(ChangeListener... listener) {
    if (listeners == null) {
      listeners = new ArrayList();
    }
    for (int i = 0; i < listener.length; i++) {
      listeners.add(listener[i]);
    }
  }

  public boolean isSilent() {
    return silent;
  }

  public void notify(ChangeEvent event) {
    if (!silent && listeners != null) {
      //make a copy of it because of ConcurrentModificationException
      List l = new ArrayList(listeners);
      for (int i = 0, len = l.size(); i< len; i++) {
        ChangeListener listener = l.get(i);
        listener.modelChanged(event);
      }
    }
  }

  public void removeChangeListener(ChangeListener... listener) {
    if (listeners != null) {
      for (int i = 0; i < listener.length; i++) {
        listeners.remove(listener[i]);
      }
    }
  }

  public void setSilent(boolean silent) {
    this.silent = silent;
  }

  public void removeChangeListeners() {
    if (listeners != null) {
      listeners.clear();
    }
  }

}