parquet.io.api.RecordMaterializer Maven / Gradle / Ivy
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/*
* 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 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();
}