parquet.io.api.RecordMaterializer 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.io.api;
/**
* Top-level class which should be implemented in order to materialize objects from
* a stream of Parquet data.
*
* Each record will be wrapped by {@link GroupConverter#start()} and {@link GroupConverter#end()},
* between which the appropriate fields will be materialized.
*
* @author Julien Le Dem
*
* @param the materialized object class
*/
abstract public class RecordMaterializer {
/**
* @return the result of the conversion
*/
abstract public T getCurrentRecord();
/**
* Called if {@link #getCurrentRecord()} isn't going to be called.
*/
public void skipCurrentRecord() { }
/**
* @return the root converter for this tree
*/
abstract public GroupConverter getRootConverter();
}