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/*******************************************************************************
* Copyright (c) 2000, 2007 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.ole.win32;
/**
* The OleEventTable class implements a simple
* look up mechanism that maps an event type
* to a listener. Multiple listeners for the
* same event type are supported.
*
*/
class OleEventTable {
int [] types;
OleListener [] handlers;
void hook (int eventType, OleListener handler) {
if (types == null) types = new int [4];
if (handlers == null) handlers = new OleListener [4];
for (int i=0; i<types.length; i++) {
if (types [i] == 0) {
types [i] = eventType;
handlers [i] = handler;
return;
}
}
int size = types.length;
int [] newTypes = new int [size + 4];
OleListener [] newHandlers = new OleListener [size + 4];
System.arraycopy (types, 0, newTypes, 0, size);
System.arraycopy (handlers, 0, newHandlers, 0, size);
types = newTypes; handlers = newHandlers;
types [size] = eventType; handlers [size] = handler;
}
boolean hooks (int eventType) {
if (handlers == null) return false;
for (int i=0; i<types.length; i++) {
if (types [i] == eventType) return true;
}
return false;
}
void sendEvent (OleEvent event) {
if (handlers == null) return;
for (int i=0; i<types.length; i++) {
if (types [i] == event.type) {
OleListener listener = handlers [i];
if (listener != null) listener.handleEvent (event);
}
}
}
void unhook (int eventType, OleListener handler) {
if (handlers == null) return;
for (int i=0; i<types.length; i++) {
if ((types [i] == eventType) && (handlers [i] == handler)) {
types [i] = 0;
handlers [i] = null;
return;
}
}
}
boolean hasEntries() {
for (int i=0; i<types.length; i++) {
if (types[i] != 0) return true;
}
return false;
}
}
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