/*
    * Copyright 2012-2013 smartics, Kronseder & Reiner GmbH
    *
    * 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 de.smartics.properties.spi.core.convert;
  
  import java.net.URL;
  import java.util.Arrays;
  import java.util.List;
  
  import org.apache.commons.beanutils.ConvertUtils;
  import org.apache.commons.beanutils.Converter;
  import org.apache.commons.beanutils.converters.ArrayConverter;
  
  import de.smartics.properties.api.core.domain.PropertyDescriptor;
  import de.smartics.properties.api.core.domain.PropertyValueConversionException;
  import de.smartics.properties.api.core.domain.PropertyValueMessageBean;
  
  /**
   * Converter of property values to and from Strings using Apache's
   * commons-beanutils.
   */
  public final class BeanUtilsPropertyValueConverter implements
      PropertyValueConverter
  {
    // ********************************* Fields *********************************
  
    // --- constants ------------------------------------------------------------
  
    /**
     * The class version identifier.
     * <p>
     * The value of this constant is {@value}.
     * </p>
     */
    private static final long serialVersionUID = 1L;
  
    // --- members --------------------------------------------------------------
  
    // ****************************** Initializer *******************************
  
    // ****************************** Constructors ******************************
  
    // ****************************** Inner Classes *****************************
  
    // ********************************* Methods ********************************
  
    // --- init -----------------------------------------------------------------
  
    // --- get&set --------------------------------------------------------------
  
    // --- business -------------------------------------------------------------
  
    @Override
    public Object convert(final PropertyDescriptor descriptor, final Object value)
      throws PropertyValueConversionException
    {
      try
      {
        final Class<?> type = descriptor.getType().getType();
  
        final Object convertedValue;
        if (List.class.isAssignableFrom(type))
        {
          final ListPropertyHelper helper = new ListPropertyHelper(descriptor);
          final Class<?> elementType = helper.getElementType();
          ConverterUtils.ensureConverter(descriptor, elementType);
          final Converter elementConverter = ConvertUtils.lookup(elementType);
          final Class<?> arrayType = helper.getArrayTypeOfElementType();
          final ArrayConverter converter =
              new ArrayConverter(arrayType, elementConverter);
          configure(converter, elementType);
          final Object[] array = (Object[]) converter.convert(arrayType, value);
          convertedValue = Arrays.asList(array);
        }
        else
        {
          ConverterUtils.ensureConverter(descriptor, type);
          convertedValue = ConvertUtils.convert(value, type);
        }
  
        return convertedValue;
      }
      catch (final RuntimeException e)
      {
        throw new PropertyValueConversionException(new PropertyValueMessageBean(
            e, descriptor, value));
      }
   }
 
   private void configure(final ArrayConverter converter,
       final Class<?> elementType)
   {
     if (URL.class == elementType)
     {
       converter.setAllowedChars(new char[] { '.', ':', '-', '_', '#', '+', '*',
                                             '~', '?', '/', '!', '"', '$', '%',
                                             '&', '(', ')', '[', ']', '{', '}',
                                             '=', ',', ';', '@' });
       converter.setDelimiter('|');
     }
 
   }
 
   // --- object basics --------------------------------------------------------
 
 }