/*
* 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<Object> 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()) {
Class<?> arrayComponentType = targetType.getComponentType();
Object array = Array.newInstance(arrayComponentType, list.size());
if (arrayComponentType.isPrimitive()) {
for (int i = 0; i < list.size(); i++) {
Array.set(array, i, list.get(i));
}
value = array;
} else {
value = list.toArray((Object[])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;
}
}