parquet.io.EmptyRecordReader 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;
import parquet.io.api.GroupConverter;
import parquet.io.api.RecordMaterializer;
/**
* used to read empty schema
*
* @author Mickael Lacour
*
* @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 parquet.io.RecordReader#read()
*/
@Override
public T read() {
recordConsumer.start();
recordConsumer.end();
return recordMaterializer.getCurrentRecord();
}
}