/**

  * 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.classmap.generator;

 import org.dozer.classmap.ClassMap;

 import org.dozer.classmap.ClassMapBuilder;

 import org.dozer.classmap.Configuration;

 import org.dozer.util.CollectionUtils;

 import java.util.ArrayList;

 import java.util.List;

 import java.util.Set;

 import java.util.concurrent.CopyOnWriteArrayList;

 /**

 * @author Dmitry Spikhalskiy

 */

 public class BeanMappingGenerator implements ClassMapBuilder.ClassMappingGenerator {

   static final List<BeanFieldsDetector> pluggedFieldDetectors = new ArrayList<BeanFieldsDetector>();

   static final List<BeanFieldsDetector> availableFieldDetectors = new ArrayList<BeanFieldsDetector>() {{

     add(new JavaBeanFieldsDetector());

   }};

   public boolean accepts(ClassMap classMap) {

     return true;

   }

   public boolean apply(ClassMap classMap, Configuration configuration) {

     Class<?> srcClass = classMap.getSrcClassToMap();

     Class<?> destClass = classMap.getDestClassToMap();

     Set<String> destFieldNames = getAcceptsFieldsDetector(destClass).getWritableFieldNames(destClass);

     Set<String> srcFieldNames = getAcceptsFieldsDetector(srcClass).getReadableFieldNames(srcClass);

     Set<String> commonFieldNames = CollectionUtils.intersection(srcFieldNames, destFieldNames);

     for (String fieldName : commonFieldNames) {

       if (GeneratorUtils.shouldIgnoreField(fieldName, srcClass, destClass)) {

         continue;

       }

       // If field has already been accounted for, then skip

       if (classMap.getFieldMapUsingDest(fieldName) != null || classMap.getFieldMapUsingSrc(fieldName) != null) {

         continue;

       }

       GeneratorUtils.addGenericMapping(classMap, configuration, fieldName, fieldName);

     }

     return false;

   }

   private static BeanFieldsDetector getAcceptsFieldsDetector(Class<?> clazz) {

     BeanFieldsDetector detector = getAcceptsFieldDetector(clazz, pluggedFieldDetectors);

     if (detector == null) detector = getAcceptsFieldDetector(clazz, availableFieldDetectors);

     return detector;

   }

   private static BeanFieldsDetector getAcceptsFieldDetector(Class<?> clazz, List<BeanFieldsDetector> detectors) {

     for (BeanFieldsDetector detector : new CopyOnWriteArrayList<BeanFieldsDetector>(detectors)) {

       if (detector.accepts(clazz)) return detector;

     }

     return null;

   }

   public static void addPluggedFieldDetector(BeanFieldsDetector protobufBeanFieldsDetector) {

     pluggedFieldDetectors.add(protobufBeanFieldsDetector);

   }

   protected interface BeanFieldsDetector {

     boolean accepts(Class<?> clazz);

     Set<String> getReadableFieldNames(Class<?> clazz);

     Set<String> getWritableFieldNames(Class<?> clazz);

   }

 }