/**
* 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.ql.exec.persistence;
import org.apache.hadoop.hive.ql.metadata.HiveException;
public interface AbstractRowContainer<ROW> {
public interface RowIterator<ROW> {
public ROW first() throws HiveException;
public ROW next() throws HiveException;
}
public RowIterator<ROW> rowIter() throws HiveException;
/**
* add a row into the RowContainer
*
* @param t row
*/
public void addRow(ROW t) throws HiveException;
/**
* @return whether the row container has at least 1 row.
* NOTE: Originally we named this isEmpty, but that name conflicted with another interface.
*/
public boolean hasRows() throws HiveException;
/**
* @return whether the row container has 1 row.
*/
public boolean isSingleRow() throws HiveException;
/**
* @return number of elements in the RowContainer
*/
public int rowCount() throws HiveException;
/**
* Remove all elements in the RowContainer.
*/
public void clearRows() throws HiveException;
}