/*******************************************************************************
 * 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.bookmarkexplorer;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRunnable;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.help.WorkbenchHelp;
import org.eclipse.ui.internal.WorkbenchPlugin;

/**
 * Opens a properties dialog allowing the user to edit the bookmark's description. 
 */
class EditBookmarkAction extends BookmarkAction {
	
	protected EditBookmarkAction(BookmarkNavigator view) {
		super(view, BookmarkMessages.getString("Properties.text")); //$NON-NLS-1$
		WorkbenchHelp.setHelp(this, IBookmarkHelpContextIds.BOOKMARK_PROPERTIES_ACTION);
		setEnabled(false);
	}

	private IMarker marker;

	public void run() {
		if (marker != null)
			editBookmark();
	}
	
	/**
	 * Sets marker to the current selection if the selection is an instance of 
	 * <code>org.eclipse.core.resources.IMarker<code> and the selected marker's 
	 * resource is an instance of <code>org.eclipse.core.resources.IFile<code>.
	 * Otherwise sets marker to null.
	 */
	public void selectionChanged(IStructuredSelection selection) {
		marker = null;
		setEnabled(false);
		
		if (selection.size() != 1)
			return;
			
		Object o = selection.getFirstElement(); 
		if (!(o instanceof IMarker))
			return;
			
		IMarker selectedMarker = (IMarker) o;
		IResource resource = selectedMarker.getResource();
		if (resource instanceof IFile) {
			marker = selectedMarker;
			setEnabled(true);
		}
	}
	
	private void editBookmark() {
		IFile file = (IFile) marker.getResource();
		
		try {
			file.getWorkspace().run(
				new IWorkspaceRunnable() {
					public void run(IProgressMonitor monitor) throws CoreException {
						BookmarkPropertiesDialog dialog = new BookmarkPropertiesDialog(getView().getSite().getShell());
						dialog.setMarker(marker);	
						dialog.open();
					}
				},
				null);
		} catch (CoreException e) {
			WorkbenchPlugin.log(null, e.getStatus()); // We don't care
		}
	}

}