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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 extends AbstractConfigurationConverter {
38  
39      public boolean canConvert(Class type) {
40          return type.isEnum();
41      }
42  
43      public Object fromConfiguration(
44              ConverterLookup converterLookup,
45              PlexusConfiguration configuration,
46              Class type,
47              Class baseType,
48              ClassLoader classLoader,
49              ExpressionEvaluator expressionEvaluator,
50              ConfigurationListener listener)
51              throws ComponentConfigurationException {
52          if (configuration.getChildCount() > 0) {
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              try {
61                  retValue = Enum.valueOf(type, (String) retValue);
62              } catch (RuntimeException e) {
63                  throw new ComponentConfigurationException(
64                          "Cannot assign value " + retValue + " to property " + configuration.getName() + " of "
65                                  + baseType.getName() + ": " + e.getMessage(),
66                          e);
67              }
68          }
69  
70          return retValue;
71      }
72  }