001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2008-2011 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * Sonar is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    
021    package net.sourceforge.pmd.util.filter;
022    
023    /**
024     * A logical NEGATION of a Filter.
025     * 
026     * @param <T>
027     *            The underlying type on which the filter applies.
028     */
029    public class NotFilter<T> extends AbstractDelegateFilter<T> {
030            public NotFilter() {
031                    super();
032            }
033    
034            public NotFilter(Filter<T> filter) {
035                    super(filter);
036            }
037    
038            public boolean filter(T obj) {
039                    return !filter.filter(obj);
040            }
041    
042            public String toString() {
043                    return "not (" + filter + ")";
044            }
045    }