org.apache.parquet.io.api

Class RecordMaterializer<T>

java.lang.Object

org.apache.parquet.io.api.RecordMaterializer<T>

Type Parameters:

T - the materialized object class

Direct Known Subclasses:

DummyRecordConverter, FilteringRecordMaterializer, GroupRecordConverter

public abstract class RecordMaterializer<T>
extends Object

Top-level class which should be implemented in order to materialize objects from a stream of Parquet data. Each record will be wrapped by GroupConverter.start() and GroupConverter.end(), between which the appropriate fields will be materialized.

Author:

Julien Le Dem

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	RecordMaterializer.RecordMaterializationException This exception signals that the current record is cannot be converted from parquet columns to a materialized record, but can be skipped if requested.

Constructor Summary

Constructors

Constructor and Description
RecordMaterializer()

Method Summary

Modifier and Type	Method and Description
abstract T	getCurrentRecord()
abstract GroupConverter	getRootConverter()
void	skipCurrentRecord() Called if getCurrentRecord() isn't going to be called.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RecordMaterializer

public RecordMaterializer()

Method Detail

getCurrentRecord

public abstract T getCurrentRecord()

Returns:

the result of the conversion

Throws:

RecordMaterializer.RecordMaterializationException - to signal that a record cannot be materialized, but can be skipped

skipCurrentRecord

public void skipCurrentRecord()

Called if getCurrentRecord() isn't going to be called.

getRootConverter

public abstract GroupConverter getRootConverter()

Returns:

the root converter for this tree