org.apache.parquet.io.EmptyRecordReader 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.io;
import org.apache.parquet.io.api.GroupConverter;
import org.apache.parquet.io.api.RecordMaterializer;
/**
* used to read empty schema
*
* @param the type of the materialized record
*/
class EmptyRecordReader extends RecordReader {
private final GroupConverter recordConsumer;
private final RecordMaterializer recordMaterializer;
public EmptyRecordReader(RecordMaterializer recordMaterializer) {
this.recordMaterializer = recordMaterializer;
this.recordConsumer = recordMaterializer.getRootConverter(); // TODO: validator(wrap(recordMaterializer), validating, root.getType());
}
/**
* @see org.apache.parquet.io.RecordReader#read()
*/
@Override
public T read() {
recordConsumer.start();
recordConsumer.end();
return recordMaterializer.getCurrentRecord();
}
}