| /******************************************************************************* |
| * Copyright (c) 2005, 2015 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ui.internal.handlers; |
| |
| import org.eclipse.core.commands.ExecutionEvent; |
| import org.eclipse.core.commands.ExecutionException; |
| import org.eclipse.core.commands.IHandler; |
| import org.eclipse.core.commands.IHandlerListener; |
| import org.eclipse.core.commands.util.Tracing; |
| import org.eclipse.ui.internal.commands.ILegacyAttributeNames; |
| import org.eclipse.ui.internal.misc.Policy; |
| |
| /** |
| * A handler that wraps a legacy handler. This provide backward compatibility |
| * with the handlers release in Eclipse 3.0. |
| * |
| * @since 3.1 |
| */ |
| public final class LegacyHandlerWrapper implements IHandler { |
| |
| /** |
| * This flag can be set to <code>true</code> if commands should print |
| * information to <code>System.out</code> when changing handlers. |
| */ |
| private static final boolean DEBUG_HANDLERS = Policy.DEBUG_HANDLERS && Policy.DEBUG_HANDLERS_VERBOSE; |
| |
| /** |
| * The wrapped handler; never <code>null</code>. |
| */ |
| private final org.eclipse.ui.commands.IHandler handler; |
| |
| /** |
| * Constructs a new instance of <code>HandlerWrapper</code>. |
| * |
| * @param handler The handler that should be wrapped; must not be |
| * <code>null</code>. |
| */ |
| public LegacyHandlerWrapper(final org.eclipse.ui.commands.IHandler handler) { |
| if (handler == null) { |
| throw new NullPointerException("A handler wrapper cannot be constructed on a null handler"); //$NON-NLS-1$ |
| } |
| |
| this.handler = handler; |
| } |
| |
| @Override |
| public void addHandlerListener(final IHandlerListener handlerListener) { |
| handler.addHandlerListener(new LegacyHandlerListenerWrapper(this, handlerListener)); |
| } |
| |
| @Override |
| public void dispose() { |
| handler.dispose(); |
| } |
| |
| @Override |
| public boolean equals(final Object object) { |
| if (object instanceof org.eclipse.ui.commands.IHandler) { |
| return this.handler == object; |
| } |
| |
| if (object instanceof LegacyHandlerWrapper) { |
| return this.handler == ((LegacyHandlerWrapper) object).handler; |
| } |
| |
| return false; |
| } |
| |
| @Override |
| public Object execute(final ExecutionEvent event) throws ExecutionException { |
| // Debugging output |
| if (DEBUG_HANDLERS) { |
| final StringBuilder buffer = new StringBuilder("Executing LegacyHandlerWrapper for "); //$NON-NLS-1$ |
| if (handler == null) { |
| buffer.append("no handler"); //$NON-NLS-1$ |
| } else { |
| buffer.append('\''); |
| buffer.append(handler.getClass().getName()); |
| buffer.append('\''); |
| } |
| Tracing.printTrace("HANDLERS", buffer.toString()); //$NON-NLS-1$ |
| } |
| |
| try { |
| return handler.execute(event.getParameters()); |
| } catch (final org.eclipse.ui.commands.ExecutionException e) { |
| throw new ExecutionException(e.getMessage(), e.getCause()); |
| } |
| } |
| |
| @Override |
| public int hashCode() { |
| return this.handler.hashCode(); |
| } |
| |
| @Override |
| public boolean isEnabled() { |
| final Object enabled = handler.getAttributeValuesByName().get(ILegacyAttributeNames.ENABLED); |
| if (enabled instanceof Boolean) { |
| return ((Boolean) enabled).booleanValue(); |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public boolean isHandled() { |
| final Object handled = handler.getAttributeValuesByName().get(ILegacyAttributeNames.HANDLED); |
| if (handled instanceof Boolean) { |
| return ((Boolean) handled).booleanValue(); |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public void removeHandlerListener(final IHandlerListener handlerListener) { |
| handler.removeHandlerListener(new LegacyHandlerListenerWrapper(this, handlerListener)); |
| } |
| |
| @Override |
| public String toString() { |
| final StringBuilder buffer = new StringBuilder(); |
| |
| buffer.append("LegacyHandlerWrapper("); //$NON-NLS-1$ |
| buffer.append(handler); |
| buffer.append(')'); |
| |
| return buffer.toString(); |
| } |
| } |