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    }