/*******************************************************************************
 * 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.ui.views.bookmarkexplorer;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IResource;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.views.bookmarkexplorer.BookmarkMessages;

/**
 * Opens a properties dialog allowing the user to edit the bookmark's description.
 */
class EditBookmarkAction extends BookmarkAction {

    protected EditBookmarkAction(BookmarkNavigator view) {
        super(view, BookmarkMessages.Properties_text);
        PlatformUI.getWorkbench().getHelpSystem().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() {
    	BookmarkPropertiesDialog dialog = new BookmarkPropertiesDialog(
    			getView().getSite().getShell());
    	dialog.setMarker(marker);
    	dialog.open();
    }
}