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.java.ast.visitor;
021    
022    import java.util.Arrays;
023    import java.util.List;
024    
025    import org.sonar.squid.measures.Metric;
026    
027    import com.puppycrawl.tools.checkstyle.api.DetailAST;
028    import com.puppycrawl.tools.checkstyle.api.TokenTypes;
029    
030    public class BranchVisitor extends JavaAstVisitor {
031    
032      private static final List<Integer> TOKENS = Arrays.asList(TokenTypes.LITERAL_WHILE, TokenTypes.LITERAL_DO, TokenTypes.LITERAL_FOR,
033                                                          TokenTypes.LITERAL_IF, TokenTypes.LITERAL_CASE, TokenTypes.LITERAL_CATCH,
034                                                          TokenTypes.QUESTION, TokenTypes.LAND, TokenTypes.LOR, TokenTypes.LITERAL_THROW,
035                                                          TokenTypes.LITERAL_RETURN);
036    
037      @Override
038      public List<Integer> getWantedTokens() {
039        return TOKENS;
040      }
041    
042      @Override
043      public void visitToken(DetailAST ast) {
044        if (isLastMethodReturnStatement(ast)) {
045          return;
046        }
047        peekSourceCode().add(Metric.BRANCHES, 1);
048      }
049    
050      private boolean isLastMethodReturnStatement(DetailAST ast) {
051        if (ast.getType() == TokenTypes.LITERAL_RETURN) {
052          DetailAST parent = ast.getParent();
053          if (parent.getType() == TokenTypes.SLIST) {
054            DetailAST method = AstUtils.findParent(ast, TokenTypes.METHOD_DEF);
055            if (method != null && method.findFirstToken(TokenTypes.SLIST) == parent) {
056              return true;
057            }
058          }
059        }
060        return false;
061      }
062    }