org.eclipse.debug.ui/ui/org/eclipse/debug/internal/ui/actions/LaunchShortcutAction.java

/*******************************************************************************
 * Copyright (c) 2000, 2006 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.debug.internal.ui.actions;


import java.util.List;

import org.eclipse.core.expressions.EvaluationContext;
import org.eclipse.core.expressions.Expression;
import org.eclipse.core.expressions.IEvaluationContext;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.debug.internal.ui.DebugUIPlugin;
import org.eclipse.debug.internal.ui.launchConfigurations.LaunchShortcutExtension;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;

/**
 * Launch shortcut action (proxy to a launch shortcut extension)
 */
public class LaunchShortcutAction extends Action {
	
	private String fMode;
	private LaunchShortcutExtension fShortcut; 


	/**
	 * Constructor for LaunchShortcutAction.
	 */
	public LaunchShortcutAction(String mode, LaunchShortcutExtension shortcut) {
		super(shortcut.getLabel(), shortcut.getImageDescriptor());
		fMode = mode;
		fShortcut = shortcut;
		updateEnablement();
	}
	
	

	/**
	 * Runs with either the active editor or workbench selection.
	 * 
	 * @see IAction#run()
	 */
	public void run() {
		IWorkbenchWindow wb = DebugUIPlugin.getActiveWorkbenchWindow();
		if (wb != null) {
			IWorkbenchPage page = wb.getActivePage();
			if (page != null) {
				if (page.getActivePart() == page.getActiveEditor()) {
					IEditorPart editor = page.getActiveEditor();
					if (editor != null) {
						fShortcut.launch(editor, fMode);
					}
				} else {
					ISelection selection = page.getSelection();
					if (selection instanceof IStructuredSelection) {
						fShortcut.launch(selection, fMode);
					}
				}
			}
		}
	}
	
	/**
	 * Since these actions are re-created each time the run/debug as menu is
	 * filled, the enablement of this action is static.
	 */
	private void updateEnablement() {
		IWorkbenchWindow wb = DebugUIPlugin.getActiveWorkbenchWindow();
		boolean enabled = false;
		if (wb != null) {
			IWorkbenchPage page = wb.getActivePage();
			if (page != null) {
				ISelection selection = page.getSelection();
				if (selection instanceof IStructuredSelection) {
					IStructuredSelection structuredSelection = (IStructuredSelection)selection;
					try {
						// check enablement logic, if any
						Expression expression = fShortcut.getShortcutEnablementExpression();
						if (expression == null) {
							enabled = !structuredSelection.isEmpty();
						} else {
							List list = structuredSelection.toList();
							IEvaluationContext context = new EvaluationContext(null, list);
							context.addVariable("selection", list); //$NON-NLS-1$
							enabled = fShortcut.evalEnablementExpression(context, expression);
						}
					} catch (CoreException e) {
					}
				} else {
					IEditorPart editor = page.getActiveEditor();
					if (editor != null) {
						enabled = true;
					}
				}
			}
		}		
		setEnabled(enabled);
	}

}