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1   ////////////////////////////////////////////////////////////////////////////////
2   // checkstyle: Checks Java source code for adherence to a set of rules.
3   // Copyright (C) 2001-2017 the original author or authors.
4   //
5   // This library is free software; you can redistribute it and/or
6   // modify it under the terms of the GNU Lesser General Public
7   // License as published by the Free Software Foundation; either
8   // version 2.1 of the License, or (at your option) any later version.
9   //
10  // This library is distributed in the hope that it will be useful,
11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  // Lesser General Public License for more details.
14  //
15  // You should have received a copy of the GNU Lesser General Public
16  // License along with this library; if not, write to the Free Software
17  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18  ////////////////////////////////////////////////////////////////////////////////
19  
20  package com.puppycrawl.tools.checkstyle.checks.indentation;
21  
22  import com.puppycrawl.tools.checkstyle.api.DetailAST;
23  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
24  
25  /**
26   * Handler for else blocks.
27   *
28   * @author jrichard
29   */
30  public class ElseHandler extends BlockParentHandler {
31      /**
32       * Construct an instance of this handler with the given indentation check,
33       * abstract syntax tree, and parent handler.
34       *
35       * @param indentCheck   the indentation check
36       * @param ast           the abstract syntax tree
37       * @param parent        the parent handler
38       */
39      public ElseHandler(IndentationCheck indentCheck,
40          DetailAST ast, AbstractExpressionHandler parent) {
41          super(indentCheck, "else", ast, parent);
42      }
43  
44      @Override
45      protected void checkTopLevelToken() {
46          // check if else is nested with rcurly of if:
47          //
48          //  } else ...
49  
50          final DetailAST ifAST = getMainAst().getParent();
51          final DetailAST slist = ifAST.findFirstToken(TokenTypes.SLIST);
52          if (slist == null) {
53              super.checkTopLevelToken();
54          }
55          else {
56              final DetailAST lcurly = slist.getLastChild();
57              // indentation checked as part of LITERAL IF check
58              if (lcurly.getLineNo() != getMainAst().getLineNo()) {
59                  super.checkTopLevelToken();
60              }
61          }
62      }
63  
64      @Override
65      protected DetailAST getNonListChild() {
66          return getMainAst().getFirstChild();
67      }
68  }