core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/filters/NonScriptElementFilter.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.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IStorage;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;



/**
 * Filters out all non-Script elements.
 */
public class NonScriptElementFilter  extends ViewerFilter {

	/**
	 * Returns the result of this filter, when applied to the
	 * given inputs.
	 *
	 * @return Returns true if element should be included in filtered set
	 */
	@Override
	public boolean select(Viewer viewer, Object parent, Object element) {
		if (element instanceof IModelElement)
			return true;

		if (element instanceof IResource) {
			IProject project= ((IResource)element).getProject();
			return project == null || !project.isOpen();
		}

		// Exclude all IStorage elements which are neither Script elements nor resources
		if (element instanceof IStorage)
			return false;

		return true;
	}
}