org.apache.parquet.column.page.PageReader Maven / Gradle / Ivy
/*
* 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.parquet.column.page;
/**
* Reader for a sequence a page from a given column chunk
*/
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
*/
DataPage readPage();
}