/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * 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:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.browsing.ui;

/**
 * A basic SelectionFilter implementation that filters NodeContexts into the
 * input objects contained by the contexts.
 * 
 * @author Tuukka Lehtonen
 * 
 * @see GraphExplorer#setSelectionFilter(SelectionFilter)
 */
public class InputSelectionFilter implements SelectionFilter {

    public static final InputSelectionFilter INSTANCE = new InputSelectionFilter();

    @Override
    public Object filter(NodeContext context) {
        return context.getConstant(BuiltinKeys.INPUT);
    }

}