Bug 125420 [Commands] parameters: allow commands to specify return type
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/Command.java
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 * 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
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 * Contributors:
 *     IBM Corporation - initial API and implementation
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package org.eclipse.core.commands;
import org.eclipse.core.commands.common.NotDefinedException;
import org.eclipse.core.commands.util.Tracing;
import org.eclipse.core.internal.commands.util.Util;
import org.eclipse.core.runtime.ListenerList;
/**
 * <p>
 * A command is an abstract representation for some semantic behaviour. It is