/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.hadoop.hive.serde2.objectinspector;
import java.util.List;
/**
* ListObjectInspector.
*
*/
public interface ListObjectInspector extends ObjectInspector {
// ** Methods that does not need a data object **
ObjectInspector getListElementObjectInspector();
// ** Methods that need a data object **
/**
* returns null for null list, out-of-the-range index.
*/
Object getListElement(Object data, int index);
/**
* returns -1 for data = null.
*/
int getListLength(Object data);
/**
* returns null for data = null.
*
* Note: This method should not return a List object that is reused by the
* same ListObjectInspector, because it's possible that the same
* ListObjectInspector will be used in multiple places in the code.
*
* However it's OK if the List object is part of the Object data.
*/
List<?> getList(Object data);
}