/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ui.views.tasklist;

import org.eclipse.core.resources.*;
import org.eclipse.jface.util.OpenStrategy;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.help.WorkbenchHelp;
import org.eclipse.ui.ide.IDE;
import org.eclipse.ui.internal.ide.DialogUtil;

/**
 * This action opens an editor for the resource
 * associated with the selected marker, and
 * jumps to the marker's location in the editor.
 */
class GotoTaskAction extends TaskAction {

	/**
	 * Creates the action.
	 */
	public GotoTaskAction(TaskList tasklist, String id) {
		super(tasklist, id);
		WorkbenchHelp.setHelp(this, ITaskListHelpContextIds.GOTO_TASK_ACTION);
	}

	/**
	 * Performs this action. This action works only for single selection.
	 */
	public void run() {
		IStructuredSelection selection = (IStructuredSelection) getTaskList().getSelection();
		Object o = selection.getFirstElement();
		if (!(o instanceof IMarker))
			return;
		IMarker marker = (IMarker) o;
		IResource resource = marker.getResource();
		if (marker.exists() && resource instanceof IFile) {
			IWorkbenchPage page = getTaskList().getSite().getPage();
			try {
				IDE.openEditor(page, marker, OpenStrategy.activateOnOpen());
			} catch (PartInitException e) {
				DialogUtil.openError(
					page.getWorkbenchWindow().getShell(),
					TaskListMessages.getString("GotoTask.errorMessage"), //$NON-NLS-1$
					e.getMessage(),
					e);
			}
		}
	}
}