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 */ 020package org.sonar.duplications.statement; 021 022import java.util.ArrayList; 023import java.util.List; 024 025import org.sonar.duplications.statement.matcher.TokenMatcher; 026import org.sonar.duplications.token.Token; 027import org.sonar.duplications.token.TokenQueue; 028 029public final class StatementChannel { 030 031 private final TokenMatcher[] tokenMatchers; 032 private final boolean blackHole; 033 034 public static StatementChannel create(TokenMatcher... tokenMatchers) { 035 return new StatementChannel(false, tokenMatchers); 036 } 037 038 public static StatementChannel createBlackHole(TokenMatcher... tokenMatchers) { 039 return new StatementChannel(true, tokenMatchers); 040 } 041 042 private StatementChannel(boolean blackHole, TokenMatcher... tokenMatchers) { 043 if (tokenMatchers == null || tokenMatchers.length == 0) { 044 throw new IllegalArgumentException(); 045 } 046 this.blackHole = blackHole; 047 this.tokenMatchers = tokenMatchers; 048 } 049 050 public boolean consume(TokenQueue tokenQueue, List<Statement> output) { 051 List<Token> matchedTokenList = new ArrayList<Token>(); 052 for (TokenMatcher tokenMatcher : tokenMatchers) { 053 if (!tokenMatcher.matchToken(tokenQueue, matchedTokenList)) { 054 tokenQueue.pushForward(matchedTokenList); 055 return false; 056 } 057 } 058 059 // all matchers were successful, so now build the statement 060 // matchedTokenList.size() check is for case with ForgiveLastTokenMatcher 061 if (!blackHole && !matchedTokenList.isEmpty()) { 062 output.add(new Statement(matchedTokenList)); 063 } 064 return true; 065 } 066 067}