package org.codehaus.plexus.component.configurator.converters.basic;
   
   /*
    * The MIT License
    *
    * Copyright (c) 2004, The Codehaus
    *
    * Permission is hereby granted, free of charge, to any person obtaining a copy of
    * this software and associated documentation files (the "Software"), to deal in
   * the Software without restriction, including without limitation the rights to
   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
   * of the Software, and to permit persons to whom the Software is furnished to do
   * so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  import org.codehaus.plexus.component.configurator.ComponentConfigurationException;
  import org.codehaus.plexus.component.configurator.ConfigurationListener;
  import org.codehaus.plexus.component.configurator.converters.AbstractConfigurationConverter;
  import org.codehaus.plexus.component.configurator.converters.lookup.ConverterLookup;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
  import org.codehaus.plexus.configuration.PlexusConfiguration;
  
  /**
   * @author Benjamin Bentmann
   */
  public class EnumConverter extends AbstractConfigurationConverter {
  
      public boolean canConvert(Class type) {
          return type.isEnum();
      }
  
      public Object fromConfiguration(
              ConverterLookup converterLookup,
              PlexusConfiguration configuration,
              Class type,
              Class baseType,
              ClassLoader classLoader,
              ExpressionEvaluator expressionEvaluator,
              ConfigurationListener listener)
              throws ComponentConfigurationException {
          if (configuration.getChildCount() > 0) {
              throw new ComponentConfigurationException("When configuring a basic element the configuration cannot "
                      + "contain any child elements. " + "Configuration element '" + configuration.getName() + "'.");
          }
  
          Object retValue = fromExpression(configuration, expressionEvaluator);
  
          if (retValue instanceof String) {
              try {
                  retValue = Enum.valueOf(type, (String) retValue);
              } catch (RuntimeException e) {
                  throw new ComponentConfigurationException(
                          "Cannot assign value " + retValue + " to property " + configuration.getName() + " of "
                                  + baseType.getName() + ": " + e.getMessage(),
                          e);
              }
          }
  
          return retValue;
      }
  }