FileTreeDeferredContentProvider.java

/**
 * This file Copyright (c) 2005-2010 Aptana, Inc. This program is
 * dual-licensed under both the Aptana Public License and the GNU General
 * Public license. You may elect to use one or the other of these licenses.
 * 
 * This program is distributed in the hope that it will be useful, but
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 * NONINFRINGEMENT. Redistribution, except as permitted by whichever of
 * the GPL or APL you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or modify this
 * program under the terms of the GNU General Public License,
 * Version 3, as published by the Free Software Foundation.  You should
 * have received a copy of the GNU General Public License, Version 3 along
 * with this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Aptana provides a special exception to allow redistribution of this file
 * with certain other free and open source software ("FOSS") code and certain additional terms
 * pursuant to Section 7 of the GPL. You may view the exception and these
 * terms on the web at http://www.aptana.com/legal/gpl/.
 * 
 * 2. For the Aptana Public License (APL), this program and the
 * accompanying materials are made available under the terms of the APL
 * v1.0 which accompanies this distribution, and is available at
 * http://www.aptana.com/legal/apl/.
 * 
 * You may view the GPL, Aptana's exception and additional terms, and the
 * APL in the file titled license.html at the root of the corresponding
 * plugin containing this source file.
 * 
 * Any modifications to this file must keep this entire header intact.
 */

package com.aptana.ide.ui.io.navigator;

import org.eclipse.ui.model.WorkbenchContentProvider;
import org.eclipse.ui.progress.DeferredTreeContentManager;

/**
 * @author Max Stepanov
 *
 */
public class FileTreeDeferredContentProvider extends WorkbenchContentProvider {

	private DeferredTreeContentManager deferredTreeContentManager;

	/**
	 * 
	 */
	public FileTreeDeferredContentProvider(DeferredTreeContentManager deferredTreeContentManager) {
		this.deferredTreeContentManager = deferredTreeContentManager;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.model.BaseWorkbenchContentProvider#getChildren(java.lang.Object)
	 */
	@Override
	public Object[] getChildren(Object element) {
		Object[] children = deferredTreeContentManager.getChildren(element);
		if (children != null) {
			return children;
		}
		return super.getChildren(element);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.model.BaseWorkbenchContentProvider#hasChildren(java.lang.Object)
	 */
	@Override
	public boolean hasChildren(Object element) {
		if (element instanceof FileSystemObject) {
			return ((FileSystemObject) element).isDirectory();
		}
		if (deferredTreeContentManager.isDeferredAdapter(element)) {
			return deferredTreeContentManager.mayHaveChildren(element);
		}
		return super.hasChildren(element);
	}
	
}