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The MyBatis SQL mapper framework makes it easier to use a relational database with object-oriented applications. MyBatis couples objects with stored procedures or SQL statements using a XML descriptor or annotations. Simplicity is the biggest advantage of the MyBatis data mapper over object relational mapping tools.

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/*
 *    Copyright 2009-2012 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;

import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.factory.ObjectFactory;
import org.apache.ibatis.session.Configuration;

import java.lang.reflect.Array;
import java.util.List;

/**
 * @author Andrew Gustafson
 */
public class ResultExtractor {
  private final Configuration configuration;
  private final ObjectFactory objectFactory;

  public ResultExtractor(Configuration configuration, ObjectFactory objectFactory) {
    this.configuration = configuration;
    this.objectFactory = objectFactory;
  }

  public Object extractObjectFromList(List list, Class targetType) {
    Object value = null;
    if (targetType != null && targetType.isAssignableFrom(list.getClass())) {
      value = list;
    } else if (targetType != null && objectFactory.isCollection(targetType)) {
      value = objectFactory.create(targetType);
      MetaObject metaObject = configuration.newMetaObject(value);
      metaObject.addAll(list);
    } else if (targetType != null && targetType.isArray()) {
      Object[] array = (Object[]) Array.newInstance(targetType.getComponentType(), list.size());
      value = list.toArray(array);
    } else {
      if (list != null && list.size() > 1) {
        throw new ExecutorException("Statement returned more than one row, where no more than one was expected.");
      } else if (list != null && list.size() == 1) {
        value = list.get(0);
      }
    }
    return value;
  }
}