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.java.ast.visitor;
021
022import java.util.Arrays;
023import java.util.List;
024
025import org.sonar.squid.measures.Metric;
026
027import com.puppycrawl.tools.checkstyle.api.DetailAST;
028import com.puppycrawl.tools.checkstyle.api.TokenTypes;
029
030public 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}