| /******************************************************************************* |
| * Copyright (c) 2004, 2005 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.core.commands; |
| |
| import org.eclipse.core.commands.common.AbstractBitSetEvent; |
| |
| /** |
| * An instance of this class describes changes to an instance of |
| * <code>IHandler</code>. |
| * <p> |
| * This class is not intended to be extended by clients. |
| * </p> |
| * |
| * @since 3.1 |
| * @see IHandlerListener#handlerChanged(HandlerEvent) |
| */ |
| public final class HandlerEvent extends AbstractBitSetEvent { |
| |
| /** |
| * The bit used to represent whether the handler has changed its enabled |
| * state. |
| */ |
| private static final int CHANGED_ENABLED = 1; |
| |
| /** |
| * The bit used to represent whether the handler has changed its handled |
| * state. |
| */ |
| private static final int CHANGED_HANDLED = 1 << 1; |
| |
| /** |
| * The handler that changed; this value is never <code>null</code>. |
| */ |
| private final IHandler handler; |
| |
| /** |
| * Creates a new instance of this class. |
| * |
| * @param handler |
| * the instance of the interface that changed; must not be |
| * <code>null</code>. |
| * @param enabledChanged |
| * Whether the enabled state of the handler has changed. |
| * @param handledChanged |
| * Whether the handled state of the handler has changed. |
| */ |
| public HandlerEvent(final IHandler handler, final boolean enabledChanged, |
| final boolean handledChanged) { |
| if (handler == null) |
| throw new NullPointerException(); |
| this.handler = handler; |
| |
| if (enabledChanged) { |
| changedValues |= CHANGED_ENABLED; |
| } |
| if (handledChanged) { |
| changedValues |= CHANGED_HANDLED; |
| } |
| } |
| |
| /** |
| * Returns the instance of the interface that changed. |
| * |
| * @return the instance of the interface that changed. Guaranteed not to be |
| * <code>null</code>. |
| */ |
| public IHandler getHandler() { |
| return handler; |
| } |
| |
| /** |
| * Returns whether or not the enabled property changed. |
| * |
| * @return <code>true</code>, iff the enabled property changed. |
| */ |
| public boolean isEnabledChanged() { |
| return ((changedValues & CHANGED_ENABLED) != 0); |
| } |
| |
| /** |
| * Returns whether or not the handled property changed. |
| * |
| * @return <code>true</code>, iff the handled property changed. |
| */ |
| public boolean isHandledChanged() { |
| return ((changedValues & CHANGED_HANDLED) != 0); |
| } |
| } |