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     * Consumes only one specified token.
029     */
030    public class ExactTokenMatcher extends TokenMatcher {
031    
032      private final String tokenToMatch;
033    
034      public ExactTokenMatcher(String tokenToMatch) {
035        if (tokenToMatch == null) {
036          throw new IllegalArgumentException();
037        }
038        this.tokenToMatch = tokenToMatch;
039      }
040    
041      @Override
042      public boolean matchToken(TokenQueue tokenQueue, List<Token> matchedTokenList) {
043        if (tokenQueue.isNextTokenValue(tokenToMatch)) {
044          matchedTokenList.add(tokenQueue.poll());
045          return true;
046        }
047        return false;
048      }
049    
050    }