001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2008-2012 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    package org.sonar.duplications.statement.matcher;
021    
022    import java.util.List;
023    
024    import org.sonar.duplications.token.Token;
025    import org.sonar.duplications.token.TokenQueue;
026    
027    /**
028     * Delegates consumption to another matcher.
029     */
030    public class OptTokenMatcher extends TokenMatcher {
031    
032      private final TokenMatcher matcher;
033    
034      public OptTokenMatcher(TokenMatcher matcher) {
035        if (matcher == null) {
036          throw new IllegalArgumentException();
037        }
038        this.matcher = matcher;
039      }
040    
041      /**
042       * @return always true
043       */
044      @Override
045      public boolean matchToken(TokenQueue tokenQueue, List<Token> matchedTokenList) {
046        matcher.matchToken(tokenQueue, matchedTokenList);
047        return true;
048      }
049    
050    }