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SWT is an open source widget toolkit for Java designed to provide efficient, portable access to the user-interface facilities of the operating systems on which it is implemented.

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/*******************************************************************************
 * Copyright (c) 2000, 2011 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.widgets;


import org.eclipse.swt.*;
import org.eclipse.swt.internal.SWTEventListener;

/**
 * Instances of this class implement a simple
 * look up mechanism that maps an event type
 * to a listener.  Multiple listeners for the
 * same event type are supported.
 */

class EventTable {
	int [] types;
	Listener [] listeners;
	int level;
	static final int GROW_SIZE = 4;
	
public Listener [] getListeners (int eventType) {
	if (types == null) return new Listener [0];
	int count = 0;
	for (int i=0; i= 0) {
		if (types [index] != 0) break;
		--index;
	}
	index++;
	if (index == length) {
		int [] newTypes = new int [length + GROW_SIZE];
		System.arraycopy (types, 0, newTypes, 0, length);
		types = newTypes;
		Listener [] newListeners = new Listener [length + GROW_SIZE];
		System.arraycopy (listeners, 0, newListeners, 0, length);
		listeners = newListeners;
	}
	types [index] = eventType;
	listeners [index] = listener;
}

public boolean hooks (int eventType) {
	if (types == null) return false;
	for (int i=0; i= 0 ? 1 : -1;
	try {
		for (int i=0; i= 0 ? 1 : -1;
		if (compact && level == 0) {
			int index = 0;
			for (int i=0; i 0) level = -level;
	}
	types [index] = 0;
	listeners [index] = null;
}

public void unhook (int eventType, Listener listener) {
	if (types == null) return;
	for (int i=0; i