PropertiesExpander


1   ////////////////////////////////////////////////////////////////////////////////
2   // checkstyle: Checks Java source code for adherence to a set of rules.
3   // Copyright (C) 2001-2005  Oliver Burn
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  package com.puppycrawl.tools.checkstyle;
20  
21  import java.util.Properties  ;
22  
23  /**
24   * Resolves external properties from an
25   * underlying <code>Properties</code> object.
26   *
27   * @author lkuehne
28   */
29  public final class PropertiesExpander
30      implements PropertyResolver
31  {
32      /** the underlying Properties object. */
33      private final Properties   mProperties;
34  
35      /**
36       * Creates a new PropertiesExpander.
37       * @param aProperties the underlying properties to use for
38       * property resolution.
39       * @throws IllegalArgumentException indicates null was passed
40       */
41      public PropertiesExpander(Properties   aProperties)
42      {
43          if (aProperties == null) {
44              throw new IllegalArgumentException  ("cannot pass null");
45          }
46          mProperties = aProperties;
47      }
48  
49      /**
50       * {@inheritDoc}
51       */
52      public String   resolve(String   aPropertyName)
53      {
54          return mProperties.getProperty(aPropertyName);
55      }
56  }
57
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