/*
    * 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.object;
  
  import be.objectify.led.FactoryResolver;
  import be.objectify.led.ObjectFactory;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.lang.reflect.Field;
  import java.util.Collection;
  import java.util.Set;
  
  /**
   * @author Steve Chaloner
   */
  public abstract class SetFactory<T> extends AbstractObjectFactory<Set>
  {
      private static final Logger LOGGER = LoggerFactory.getLogger(SetFactory.class);
  
      private final Class clazz;
  
      private final Field field;
  
      private final FactoryResolver factoryResolver;
  
      public SetFactory(Class clazz,
                         Field field,
                         FactoryResolver factoryResolver)
      {
          this.clazz = clazz;
          this.field = field;
          this.factoryResolver = factoryResolver;
      }
  
      public Set<T> createObject(String propertyName,
                                 String propertyValue)
      {
          Set<T> set = createSet();
          ObjectFactory objectFactory = factoryResolver.resolveFactory(clazz,
                                                                       field);
          if (objectFactory == null)
          {
              LOGGER.info("No factory available for type [{}]",
                          clazz.getCanonicalName());
          }
          else
          {
              Collection<T> values = parse(propertyName,
                                           propertyValue,
                                           objectFactory);
              if (values != null)
              {
                  set.addAll(values);
              }
              else
              {
                  LOGGER.info("Property value [{}] did not parse into collection of type [{}]",
                              propertyValue,
                              clazz.getCanonicalName());
              }
          }
  
          return set;
      }
  
      public Class<Set> getBoundClass()
      {
          return Set.class;
      }
  
      protected abstract Collection<T> parse(String propertyName,
                                             String propertyValue,
                                             ObjectFactory<T> objectFactory);
  
      protected abstract Set<T> createSet();
  }