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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 switch statements.
27   *
28   * @author jrichard
29   */
30  public class SwitchHandler 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 SwitchHandler(IndentationCheck indentCheck,
40          DetailAST ast, AbstractExpressionHandler parent) {
41          super(indentCheck, "switch", ast, parent);
42      }
43  
44      @Override
45      protected DetailAST getLeftCurly() {
46          return getMainAst().findFirstToken(TokenTypes.LCURLY);
47      }
48  
49      @Override
50      protected DetailAST getRightCurly() {
51          return getMainAst().findFirstToken(TokenTypes.RCURLY);
52      }
53  
54      @Override
55      protected DetailAST getListChild() {
56          // all children should be taken care of by case handler (plus
57          // there is no parent of just the cases, if checking is needed
58          // here in the future, an additional way beyond checkChildren()
59          // will have to be devised to get children)
60          return null;
61      }
62  
63      @Override
64      protected DetailAST getNonListChild() {
65          return null;
66      }
67  
68      /**
69       * Check the indentation of the switch expression.
70       */
71      private void checkSwitchExpr() {
72          checkExpressionSubtree(
73              getMainAst().findFirstToken(TokenTypes.LPAREN).getNextSibling(),
74              getIndent(),
75              false,
76              false);
77      }
78  
79      @Override
80      public void checkIndentation() {
81          checkSwitchExpr();
82          super.checkIndentation();
83      }
84  }