/*
    * Copyright 2009-2010 Steve Chaloner
    *
    * Licensed 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.
   */
  package be.objectify.led.factory.type;
  
  import be.objectify.led.FactoryResolver;
  import be.objectify.led.GenericTypes;
  import be.objectify.led.ObjectFactory;
  import be.objectify.led.TypeFactory;
  import be.objectify.led.factory.object.MapFactory;
  import be.objectify.led.util.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.lang.reflect.Field;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.StringTokenizer;
  
  /**
   * @author Steve Chaloner
   * @version <!-- $Revision$ -->, <!-- $Date$ -->
   */
  public class MapTypeFactory implements TypeFactory<Map>
  {
      private static final Logger LOGGER = LoggerFactory.getLogger(MapTypeFactory.class);
  
      private final FactoryResolver factoryResolver;
  
      public MapTypeFactory(FactoryResolver factoryResolver)
      {
          this.factoryResolver = factoryResolver;
      }
  
      /**
       * {@inheritDoc}
       */
      public MapFactory createObjectFactory(Class[] classes,
                                            Field field)
      {
          return new MapFactory(classes[0],
                                classes[1],
                                field,
                                factoryResolver)
          {
              protected Map parse(String propertyName,
                                  String propertyValue,
                                  ObjectFactory keyObjectFactory,
                                  ObjectFactory valueObjectFactory)
              {
                  Map map = new HashMap();
                  if (!StringUtils.isEmpty(propertyValue))
                  {
                      for (StringTokenizer stringTokenizer = new StringTokenizer(propertyValue); stringTokenizer.hasMoreTokens();)
                      {
                          String s = stringTokenizer.nextToken();
                          String[] strings = s.split(":");
                          if (strings.length == 2)
                          {
                              map.put(keyObjectFactory.createObject(propertyName,
                                                                    strings[0]),
                                      valueObjectFactory.createObject(propertyName,
                                                                      strings[1]));
                          }
                          else
                          {
                              LOGGER.error("Could not separate [{}] into key:value",
                                           propertyValue);
                          }
                      }
                  }
                  return map;
              }
  
              protected Map createMap()
              {
                  return new HashMap();
              }
          };
      }
  
      /**
       * {@inheritDoc}
       */
      public Class<Map> getBoundClass()
      {
          return Map.class;
     }
 
     /**
      * {@inheritDoc}
      */
     public Class[] determineClassType(Class fieldType,
                                       GenericTypes genericTypes)
     {
         if (genericTypes == null || genericTypes.value().length != 2)
         {
             throw new RuntimeException("GenericTypes(key class, value class) annotation required to determine Map key:value types");
         }
         Class[] classes = genericTypes.value();
         return new Class[]{ classes[0], classes[1] };
     }
 }