package org.codehaus.plexus.component.configurator.converters.lookup;
   
   /*
    * 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 java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.CopyOnWriteArrayList;
  
  import org.codehaus.plexus.component.configurator.ComponentConfigurationException;
  import org.codehaus.plexus.component.configurator.converters.ConfigurationConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.BooleanConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.ByteConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.CharConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.DateConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.DoubleConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.EnumConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.FileConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.FloatConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.IntConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.LongConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.ShortConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.StringBufferConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.StringConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.UriConverter;
  import org.codehaus.plexus.component.configurator.converters.basic.UrlConverter;
  import org.codehaus.plexus.component.configurator.converters.composite.ArrayConverter;
  import org.codehaus.plexus.component.configurator.converters.composite.CollectionConverter;
  import org.codehaus.plexus.component.configurator.converters.composite.MapConverter;
  import org.codehaus.plexus.component.configurator.converters.composite.ObjectWithFieldsConverter;
  import org.codehaus.plexus.component.configurator.converters.composite.PlexusConfigurationConverter;
  import org.codehaus.plexus.component.configurator.converters.composite.PropertiesConverter;
  
  public class DefaultConverterLookup implements ConverterLookup {
      private final List<ConfigurationConverter> converters = new ArrayList<ConfigurationConverter>();
  
      private final List<ConfigurationConverter> customConverters = new CopyOnWriteArrayList<ConfigurationConverter>();
  
      private final Map<Class<?>, ConfigurationConverter> converterMap =
              new ConcurrentHashMap<Class<?>, ConfigurationConverter>();
  
      public DefaultConverterLookup() {
          registerDefaultBasicConverters();
  
          registerDefaultCompositeConverters();
      }
  
      public synchronized void registerConverter(ConfigurationConverter converter) {
          customConverters.add(converter);
      }
  
      protected void registerDefaultConverter(ConfigurationConverter converter) {
          converters.add(converter);
      }
  
      public ConfigurationConverter lookupConverterForType(Class<?> type) throws ComponentConfigurationException {
          ConfigurationConverter retValue = converterMap.get(type);
  
          if (retValue == null) {
              if (customConverters != null) {
                  retValue = findConverterForType(customConverters, type);
              }
  
              if (retValue == null) {
                  retValue = findConverterForType(converters, type);
              }
  
              if (retValue == null) {
                  // this is highly irregular
                  throw new ComponentConfigurationException("Configuration converter lookup failed for type: " + type);
              }
  
              converterMap.put(type, retValue);
          }
  
          return retValue;
     }
 
     private ConfigurationConverter findConverterForType(List<ConfigurationConverter> converters, Class<?> type) {
         for (ConfigurationConverter converter : converters) {
             if (converter.canConvert(type)) {
                 return converter;
             }
         }
 
         return null;
     }
 
     private void registerDefaultBasicConverters() {
         registerDefaultConverter(new BooleanConverter());
 
         registerDefaultConverter(new ByteConverter());
 
         registerDefaultConverter(new CharConverter());
 
         registerDefaultConverter(new DoubleConverter());
 
         registerDefaultConverter(new FloatConverter());
 
         registerDefaultConverter(new IntConverter());
 
         registerDefaultConverter(new LongConverter());
 
         registerDefaultConverter(new ShortConverter());
 
         registerDefaultConverter(new StringBufferConverter());
 
         registerDefaultConverter(new StringConverter());
 
         registerDefaultConverter(new DateConverter());
 
         registerDefaultConverter(new FileConverter());
 
         registerDefaultConverter(new UrlConverter());
 
         registerDefaultConverter(new UriConverter());
 
         registerDefaultConverter(new EnumConverter());
     }
 
     private void registerDefaultCompositeConverters() {
         registerDefaultConverter(new MapConverter());
 
         registerDefaultConverter(new ArrayConverter());
 
         registerDefaultConverter(new CollectionConverter());
 
         registerDefaultConverter(new PropertiesConverter());
 
         registerDefaultConverter(new PlexusConfigurationConverter());
 
         // this converter should be always registred as the last one
         registerDefaultConverter(new ObjectWithFieldsConverter());
     }
 }