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1   ////////////////////////////////////////////////////////////////////////////////
2   // checkstyle: Checks Java source code for adherence to a set of rules.
3   // Copyright (C) 2001-2018 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;
21  
22  import java.util.HashMap;
23  import java.util.Map;
24  
25  import com.google.common.collect.ImmutableCollection;
26  import com.google.common.collect.ImmutableList;
27  import com.puppycrawl.tools.checkstyle.api.Context;
28  
29  /**
30   * A default implementation of the Context interface.
31   * @author lkuehne
32   */
33  public final class DefaultContext implements Context {
34  
35      /** Stores the context entries. */
36      private final Map<String, Object> entries = new HashMap<>();
37  
38      @Override
39      public Object get(String key) {
40          return entries.get(key);
41      }
42  
43      @Override
44      public ImmutableCollection<String> getAttributeNames() {
45          return ImmutableList.copyOf(entries.keySet());
46      }
47  
48      /**
49       * Adds a context entry.
50       * @param key the context key
51       * @param value the value for key
52       */
53      public void add(String key, Object value) {
54          entries.put(key, value);
55      }
56  
57  }