package org.apache.maven.plugin.toolchain;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *  http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import java.util.HashMap;
  import java.util.Map;
  
  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.ConfigurationConverter;
  import org.codehaus.plexus.component.configurator.converters.lookup.ConverterLookup;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
  import org.codehaus.plexus.configuration.PlexusConfiguration;
  import org.codehaus.plexus.configuration.PlexusConfigurationException;
  
  /**
   * Custom Plexus ConfigurationConverter to instantiate <code>ToolchainRequirement</code> from configuration.
   *
   * @author mkleint
   * @see ToolchainsRequirement
   */
  public class ToolchainConverter
      extends AbstractConfigurationConverter
  {
  
      public static final String ROLE = ConfigurationConverter.class.getName();
  
      /**
       * @see org.codehaus.plexus.component.configurator.converters.ConfigurationConverter#canConvert(java.lang.Class)
       */
      public boolean canConvert( Class type )
      {
          return ToolchainsRequirement.class.isAssignableFrom( type );
      }
  
      /**
       * @see org.codehaus.plexus.component.configurator.converters.ConfigurationConverter#fromConfiguration(org.codehaus.plexus.component.configurator.converters.lookup.ConverterLookup, org.codehaus.plexus.configuration.PlexusConfiguration, java.lang.Class, java.lang.Class, java.lang.ClassLoader, org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator, org.codehaus.plexus.component.configurator.ConfigurationListener)
       */
      public Object fromConfiguration( ConverterLookup converterLookup,
                                       PlexusConfiguration configuration,
                                       Class type, Class baseType,
                                       ClassLoader classLoader,
                                       ExpressionEvaluator expressionEvaluator,
                                       ConfigurationListener listener )
          throws ComponentConfigurationException
      {
          ToolchainsRequirement retValue = new ToolchainsRequirement();
  
          processConfiguration( retValue, configuration, expressionEvaluator );
  
          return retValue;
      }
  
      private void processConfiguration( ToolchainsRequirement requirement,
                                         PlexusConfiguration configuration,
                                         ExpressionEvaluator expressionEvaluator )
          throws ComponentConfigurationException
      {
          Map<String, Map<String, String>> map = new HashMap<String, Map<String, String>>();
  
          PlexusConfiguration[] tools = configuration.getChildren();
          for ( PlexusConfiguration tool : tools )
          {
              String type = tool.getName();
              PlexusConfiguration[] params = tool.getChildren();
  
              Map<String, String> parameters = new HashMap<String, String>();
              for ( PlexusConfiguration param : params )
              {
                  try
                  {
                      parameters.put( param.getName(), param.getValue() );
                  }
                  catch ( PlexusConfigurationException ex )
                  {
                      throw new ComponentConfigurationException( ex );
                  }
              }
              map.put( type, parameters );
          }
  
         requirement.toolchains = map;
     }
 }