/*
    *    Copyright 2009-2021 the original author or authors.
    *
    *    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.apache.ibatis.executor.result;
  
  import java.util.Map;
  
  import org.apache.ibatis.reflection.MetaObject;
  import org.apache.ibatis.reflection.ReflectorFactory;
  import org.apache.ibatis.reflection.factory.ObjectFactory;
  import org.apache.ibatis.reflection.wrapper.ObjectWrapperFactory;
  import org.apache.ibatis.session.ResultContext;
  import org.apache.ibatis.session.ResultHandler;
  
  /**
   * @author Clinton Begin
   */
  public class DefaultMapResultHandler<K, V> implements ResultHandler<V> {
  
    private final Map<K, V> mappedResults;
    private final String mapKey;
    private final ObjectFactory objectFactory;
    private final ObjectWrapperFactory objectWrapperFactory;
    private final ReflectorFactory reflectorFactory;
  
    @SuppressWarnings("unchecked")
    public DefaultMapResultHandler(String mapKey, ObjectFactory objectFactory, ObjectWrapperFactory objectWrapperFactory, ReflectorFactory reflectorFactory) {
      this.objectFactory = objectFactory;
      this.objectWrapperFactory = objectWrapperFactory;
      this.reflectorFactory = reflectorFactory;
      this.mappedResults = objectFactory.create(Map.class);
      this.mapKey = mapKey;
    }
  
    @Override
    public void handleResult(ResultContext<? extends V> context) {
      final V value = context.getResultObject();
      final MetaObject mo = MetaObject.forObject(value, objectFactory, objectWrapperFactory, reflectorFactory);
      // TODO is that assignment always true?
      final K key = (K) mo.getValue(mapKey);
      mappedResults.put(key, value);
    }
  
    public Map<K, V> getMappedResults() {
      return mappedResults;
    }
  }