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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 labels.
27   *
28   * @author jrichard
29   */
30  public class LabelHandler extends AbstractExpressionHandler {
31      /**
32       * The types of expressions that are children of a label.
33       */
34      private static final int[] LABEL_CHILDREN = {
35          TokenTypes.IDENT,
36      };
37  
38      /**
39       * Construct an instance of this handler with the given indentation check,
40       * abstract syntax tree, and parent handler.
41       *
42       * @param indentCheck   the indentation check
43       * @param expr          the abstract syntax tree
44       * @param parent        the parent handler
45       */
46      public LabelHandler(IndentationCheck indentCheck,
47          DetailAST expr, AbstractExpressionHandler parent) {
48          super(indentCheck, "label", expr, parent);
49      }
50  
51      @Override
52      protected IndentLevel getIndentImpl() {
53          final IndentLevel level = new IndentLevel(super.getIndentImpl(), -getBasicOffset());
54          level.addAcceptedIndent(super.getIndentImpl());
55          return level;
56      }
57  
58      /**
59       * Check the indentation of the label.
60       */
61      private void checkLabel() {
62          checkChildren(getMainAst(), LABEL_CHILDREN, getIndent(), true, false);
63      }
64  
65      @Override
66      public void checkIndentation() {
67          checkLabel();
68          // need to check children (like 'block' parents do)
69          final DetailAST parent = getMainAst().getFirstChild().getNextSibling();
70  
71          final IndentLevel expected =
72              new IndentLevel(getIndent(), getBasicOffset());
73  
74          checkExpressionSubtree(parent, expected, true, false);
75      }
76  }