001 /***************************************************************************** 002 * Copyright (C) PicoContainer Organization. All rights reserved. * 003 * ------------------------------------------------------------------------- * 004 * The software in this package is published under the terms of the BSD * 005 * style license a copy of which has been included with this distribution in * 006 * the LICENSE.txt file. * 007 *****************************************************************************/ 008 009 package org.picocontainer.gems.constraints; 010 011 import org.picocontainer.ComponentAdapter; 012 import org.picocontainer.PicoVisitor; 013 014 /** 015 * Inverts the logical sense of the given constraint. 016 * 017 * @author Nick Sieger 018 * @version 1.1 019 */ 020 public class Not extends AbstractConstraint { 021 private Constraint constraint; 022 023 /** 024 * Creates a new <code>Not</code> instance. 025 * @param con a <code>Constraint</code> value 026 */ 027 public Not(Constraint con) { 028 this.constraint = con; 029 } 030 031 public boolean evaluate(ComponentAdapter comp) { 032 return ! constraint.evaluate(comp); 033 } 034 035 public void accept(PicoVisitor visitor) { 036 super.accept(visitor); 037 constraint.accept(visitor); 038 } 039 }