core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/filters/EmptyInnerPackageFilter.java

/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.filters;

import org.eclipse.dltk.core.IScriptFolder;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;

/**
 * Filters empty non-leaf package fragments
 */
public class EmptyInnerPackageFilter extends ViewerFilter {

	@Override
	public boolean select(Viewer viewer, Object parent, Object element) {
		if (element instanceof IScriptFolder) {
			IScriptFolder pkg= (IScriptFolder)element;
			try {
				if (pkg.isRootFolder()) {
					return pkg.hasChildren();
				}
				return !pkg.hasSubfolders() || pkg.hasChildren() || (pkg.getForeignResources().length > 0);
			} catch (ModelException e) {
				return false;
			}
		}

		return true;
	}
}