/**

  * Copyright 2005-2013 Dozer Project

  *

  * 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 org.dozer.converters;

 import org.apache.commons.lang3.ClassUtils;

 import org.apache.commons.lang3.builder.ReflectionToStringBuilder;

 import org.apache.commons.lang3.builder.ToStringStyle;

 import org.dozer.cache.Cache;

 import org.dozer.cache.CacheKeyFactory;

 import java.util.ArrayList;

 import java.util.List;

 /**

  * Internal class for holding custom converter definitions. Only intended for internal use.

  *

  * @author sullins.ben

  * @author dmitry.buzdin

  */

 public class CustomConverterContainer {

   private List<CustomConverterDescription> converters = new ArrayList<CustomConverterDescription>();

   public List<CustomConverterDescription> getConverters() {

     return converters;

   }

   public void setConverters(List<CustomConverterDescription> converters) {

     if (converters == null) {

       throw new NullPointerException("Converters can not be null!");

     }

     this.converters = converters;

   }

   public void addConverter(CustomConverterDescription converter) {

     getConverters().add(converter);

   }

   public Class getCustomConverter(Class<?> srcClass, Class<?> destClass, Cache converterTypeCache) {

     if (converters.isEmpty()) {

       return null;

     }

     // Check cache first

     final Object cacheKey = CacheKeyFactory.createKey(destClass, srcClass);

     if (converterTypeCache.containsKey(cacheKey)) { // even null

       return (Class) converterTypeCache.get(cacheKey);

     }

     // Let's see if the incoming class is a primitive:

     final Class src = ClassUtils.primitiveToWrapper(srcClass);

     final Class dest = ClassUtils.primitiveToWrapper(destClass);

     Class appropriateConverter = findConverter(src, dest);

     converterTypeCache.put(cacheKey, appropriateConverter);

     return appropriateConverter;

   }

   private Class findConverter(Class src, Class dest) {

     // Otherwise, loop through custom converters and look for a match. Also, store the result in the cache

     for (CustomConverterDescription customConverter : converters) {

       final Class classA = customConverter.getClassA();

       final Class classB = customConverter.getClassB();

       // we check to see if the destination class is the same as classA defined in the converter mapping xml.

       // we next check if the source class is the same as classA defined in the converter mapping xml.

       // we also to check to see if it is assignable to either. We then perform these checks in the other direction for classB

       if ((classA.isAssignableFrom(dest) && classB.isAssignableFrom(src))

           || (classA.isAssignableFrom(src) && classB.isAssignableFrom(dest))) {

         return customConverter.getType();

       }

     }

     return null;

   }

   @Override

   public String toString() {

     return ReflectionToStringBuilder.toString(this, ToStringStyle.MULTI_LINE_STYLE);

   }

 }