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 */ 019 @SuppressWarnings("serial") 020 public final class Not extends AbstractConstraint { 021 022 private final Constraint constraint; 023 024 /** 025 * Creates a new <code>Not</code> instance. 026 * @param con a <code>Constraint</code> value 027 */ 028 public Not(final Constraint con) { 029 this.constraint = con; 030 } 031 032 @Override 033 public boolean evaluate(final ComponentAdapter comp) { 034 return ! constraint.evaluate(comp); 035 } 036 037 @Override 038 public void accept(final PicoVisitor visitor) { 039 super.accept(visitor); 040 constraint.accept(visitor); 041 } 042 }