/*******************************************************************************
 * Copyright (c) 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.ui.tests.commands;

import org.eclipse.core.commands.Category;
import org.eclipse.core.commands.Command;
import org.eclipse.core.commands.CommandManager;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IExecutionListener;
import org.eclipse.core.commands.NotHandledException;
import org.eclipse.ui.tests.harness.util.UITestCase;

/**
 * Tests some of the API on command manager.
 * 
 * @since 3.1
 */
public final class CommandManagerTest extends UITestCase {

	/**
	 * An execution listener that can be attached to the command manager. It
	 * will track which events it last heard.
	 * 
	 * @since 3.1
	 */
	private final class ExecutionListener implements IExecutionListener {

		/**
		 * The last command identifier to be not handled, or <code>null</code>
		 * if none.
		 */
		private String notHandledId = null;

		/**
		 * The last command identifier to be executed, or <code>null</code> if
		 * none.
		 */
		private String preExecuteId = null;

		/**
		 * The last not handled exception throw, or <code>null</code> if none.
		 */
		private NotHandledException notHandledException = null;

		/**
		 * The last execution event, or <code>null</code> if none.
		 */
		private ExecutionEvent preExecuteEvent = null;

		public final void notHandled(final String commandId,
				final NotHandledException exception) {
			notHandledId = commandId;
			notHandledException = exception;
		}

		public final void postExecuteFailure(final String commandId,
				final ExecutionException exception) {
			// Do nothing.
		}

		public final void postExecuteSuccess(final String commandId,
				final Object returnValue) {
			// Do nothing
		}

		public final void preExecute(final String commandId,
				final ExecutionEvent event) {
			preExecuteId = commandId;
			preExecuteEvent = event;
		}

	}

	/**
	 * Constructs a new instance of <code>CommandManagerTest</code>.
	 * 
	 * @param name
	 *            The name of the test
	 */
	public CommandManagerTest(String testName) {
		super(testName);
	}

	public final void testExecutionListener() {
		final String commandId = "myCommand";
		final CommandManager commandManager = new CommandManager();
		final Category category = commandManager.getCategory(commandId);
		category.define("name", null);
		final Command command = commandManager.getCommand(commandId);
		command.define("name", null, category, null);
		final ExecutionListener listener = new ExecutionListener();
		commandManager.addExecutionListener(listener);
		Exception exception = null;
		final ExecutionEvent event = new ExecutionEvent();
		try {
			command.execute(event);
		} catch (final ExecutionException e) {
			exception = e;
		} catch (final NotHandledException e) {
			exception = e;
		}

		assertSame(
				"Should have received a pre-execute event for the correct command",
				commandId, listener.preExecuteId);
		assertSame(
				"Should have received a pre-execute event with the correct event",
				event, listener.preExecuteEvent);
		assertSame(
				"Should have received a not-handled event for the correct command",
				commandId, listener.notHandledId);
		assertSame(
				"Should have received a not-handled event with the correct exception",
				exception, listener.notHandledException);

	}
}