/*******************************************************************************
 * Copyright (c) 2006, 2007 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.internal.navigator.resources.workbench;

import org.eclipse.core.resources.IFile;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.ide.ResourceUtil;
import org.eclipse.ui.navigator.ILinkHelper;
import org.eclipse.ui.part.FileEditorInput;

/**
 * 
 * Links IFileEditorInput to IFiles, and vice versa.
 * 
 * @since 3.2
 *
 */
public class ResourceLinkHelper implements ILinkHelper {

	/* (non-Javadoc)
	 * @see org.eclipse.ui.navigator.ILinkHelper#findSelection(org.eclipse.ui.IEditorInput)
	 */
	public IStructuredSelection findSelection(IEditorInput anInput) {
		IFile file = ResourceUtil.getFile(anInput);
		if (file != null) {
			return new StructuredSelection(file);
		}
		return StructuredSelection.EMPTY;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.navigator.ILinkHelper#activateEditor(org.eclipse.ui.IWorkbenchPage, org.eclipse.jface.viewers.IStructuredSelection)
	 */
	public void activateEditor(IWorkbenchPage aPage,
			IStructuredSelection aSelection) {
		if (aSelection == null || aSelection.isEmpty())
			return;
		if (aSelection.getFirstElement() instanceof IFile) {
			IEditorInput fileInput = new FileEditorInput((IFile) aSelection.getFirstElement());
			IEditorPart editor = null;
			if ((editor = aPage.findEditor(fileInput)) != null)
				aPage.bringToTop(editor);
		}

	}

}