parquet.column.page.PageReader Maven / Gradle / Ivy
/**
* Copyright 2012 Twitter, Inc.
*
* 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 parquet.column.page;
/**
* Reader for a sequence a page from a given column chunk
*
* @author Julien Le Dem
*
*/
public interface PageReader {
/**
* @return the dictionary page in that chunk or null if none
*/
DictionaryPage readDictionaryPage();
/**
* @return the total number of values in the column chunk
*/
long getTotalValueCount();
/**
* @return the next page in that chunk or null if after the last page
*/
Page readPage();
}