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1   package org.codehaus.plexus.component.configurator.converters.basic;
2   
3   /*
4    * The MIT License
5    *
6    * Copyright (c) 2004, The Codehaus
7    *
8    * Permission is hereby granted, free of charge, to any person obtaining a copy of
9    * this software and associated documentation files (the "Software"), to deal in
10   * the Software without restriction, including without limitation the rights to
11   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
12   * of the Software, and to permit persons to whom the Software is furnished to do
13   * so, subject to the following conditions:
14   *
15   * The above copyright notice and this permission notice shall be included in all
16   * copies or substantial portions of the Software.
17   *
18   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24   * SOFTWARE.
25   */
26  
27  import org.codehaus.plexus.component.configurator.ComponentConfigurationException;
28  import org.codehaus.plexus.component.configurator.ConfigurationListener;
29  import org.codehaus.plexus.component.configurator.converters.AbstractConfigurationConverter;
30  import org.codehaus.plexus.component.configurator.converters.lookup.ConverterLookup;
31  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
32  import org.codehaus.plexus.configuration.PlexusConfiguration;
33  
34  /**
35   * @author Benjamin Bentmann
36   */
37  public class EnumConverter
38      extends AbstractConfigurationConverter
39  {
40  
41      public boolean canConvert( Class type )
42      {
43          return type.isEnum();
44      }
45  
46      public Object fromConfiguration( ConverterLookup converterLookup, PlexusConfiguration configuration, Class type,
47                                       Class baseType, ClassLoader classLoader, ExpressionEvaluator expressionEvaluator,
48                                       ConfigurationListener listener )
49          throws ComponentConfigurationException
50      {
51          if ( configuration.getChildCount() > 0 )
52          {
53              throw new ComponentConfigurationException( "When configuring a basic element the configuration cannot "
54                  + "contain any child elements. " + "Configuration element '" + configuration.getName() + "'." );
55          }
56  
57          Object retValue = fromExpression( configuration, expressionEvaluator );
58  
59          if ( retValue instanceof String )
60          {
61              try
62              {
63                  retValue = Enum.valueOf( type, (String) retValue );
64              }
65              catch ( RuntimeException e )
66              {
67                  throw new ComponentConfigurationException( "Cannot assign value " + retValue + " to property "
68                      + configuration.getName() + " of " + baseType.getName() + ": " + e.getMessage(), e );
69              }
70          }
71  
72          return retValue;
73      }
74  
75  }