/**

  * 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.loader;

 import org.dozer.classmap.*;

 import org.dozer.converters.CustomConverterContainer;

 import org.dozer.converters.CustomConverterDescription;

 import org.dozer.util.MappingUtils;

 import java.util.ArrayList;

 import java.util.LinkedHashSet;

 import java.util.List;

 import java.util.Map.Entry;

 import java.util.Set;

 /**

  * Internal class that loads and parses custom xml mapping files into ClassMap objects. The ClassMap objects returned

  * from the load method are fully decorated and ready to be used by the internal mapping engine. Only intended for

  * internal use.

  * 

  * @author tierney.matt

  * @author garsombke.franz

  */

 public class CustomMappingsLoader {

   private static final MappingsParser mappingsParser = MappingsParser.getInstance();

   public LoadMappingsResult load(List<MappingFileData> mappings) {

     Configuration globalConfiguration = findConfiguration(mappings);

     ClassMappings customMappings = new ClassMappings();

     // Decorate the raw ClassMap objects and create ClassMap "prime" instances

     for (MappingFileData mappingFileData : mappings) {

       List<ClassMap> classMaps = mappingFileData.getClassMaps();

       ClassMappings customMappingsPrime = mappingsParser.processMappings(classMaps, globalConfiguration);

       customMappings.addAll(customMappingsPrime);

     }

     // Add default mappings using matching property names if wildcard policy

     // is true. The addDefaultFieldMappings will check the wildcard policy of each classmap

     ClassMapBuilder.addDefaultFieldMappings(customMappings, globalConfiguration);

     Set<CustomConverterDescription> customConverterDescriptions = new LinkedHashSet<CustomConverterDescription>();

     // build up custom converter description objects

     if (globalConfiguration.getCustomConverters() != null && globalConfiguration.getCustomConverters().getConverters() != null) {

       for (CustomConverterDescription cc : globalConfiguration.getCustomConverters().getConverters()) {

         customConverterDescriptions.add(cc);

       }

     }    

     // iterate through the classmaps and set all of the custom converters on them

     for (Entry<String, ClassMap> entry : customMappings.getAll().entrySet()) {

       ClassMap classMap = entry.getValue();

       if (classMap.getCustomConverters() != null) {

         classMap.getCustomConverters().setConverters(new ArrayList<CustomConverterDescription>(customConverterDescriptions));

       } else {

         classMap.setCustomConverters(new CustomConverterContainer());

         classMap.getCustomConverters().setConverters(new ArrayList<CustomConverterDescription>(customConverterDescriptions));

       }

     }

     return new LoadMappingsResult(customMappings, globalConfiguration);

   }

   private Configuration findConfiguration(List<MappingFileData> mappingFileDataList) {

     Configuration globalConfiguration = null;

     for (MappingFileData mappingFileData : mappingFileDataList) {

       if (mappingFileData.getConfiguration() != null) {

         //Only allow 1 global configuration

         if (globalConfiguration != null) {

           MappingUtils

               .throwMappingException("More than one global configuration found.  "

                   + "Only one global configuration block (<configuration></configuration>) can be specified across all mapping files.  "

                   + "You need to consolidate all global configuration blocks into a single one.");

         }

         globalConfiguration = mappingFileData.getConfiguration();

       }

     }

     //If global configuration was not specified, use defaults

     if (globalConfiguration == null) {

       globalConfiguration = new Configuration();

     }

     return globalConfiguration;

   }

 }