/* * SonarQube * Copyright (C) 2009-2017 SonarSource SA * mailto:info AT sonarsource DOT com * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 3 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ package org.sonar.duplications.statement; import java.util.ArrayList; import java.util.List; import javax.annotation.Nullable; import org.sonar.duplications.statement.matcher.TokenMatcher; import org.sonar.duplications.token.Token; import org.sonar.duplications.token.TokenQueue; public final class StatementChannel { private final TokenMatcher[] tokenMatchers; private final boolean blackHole; private StatementChannel(boolean blackHole, @Nullable TokenMatcher... tokenMatchers) { if (tokenMatchers == null || tokenMatchers.length == 0) { throw new IllegalArgumentException(); } this.blackHole = blackHole; this.tokenMatchers = tokenMatchers; } public static StatementChannel create(TokenMatcher... tokenMatchers) { return new StatementChannel(false, tokenMatchers); } public static StatementChannel createBlackHole(TokenMatcher... tokenMatchers) { return new StatementChannel(true, tokenMatchers); } public boolean consume(TokenQueue tokenQueue, List<Statement> output) { List<Token> matchedTokenList = new ArrayList<>(); for (TokenMatcher tokenMatcher : tokenMatchers) { if (!tokenMatcher.matchToken(tokenQueue, matchedTokenList)) { tokenQueue.pushForward(matchedTokenList); return false; } } // all matchers were successful, so now build the statement // matchedTokenList.size() check is for case with ForgiveLastTokenMatcher if (!blackHole && !matchedTokenList.isEmpty()) { output.add(new Statement(matchedTokenList)); } return true; } }