Package io.deephaven.extensions.barrage.chunk

Class TransformingChunkReader<INPUT_CHUNK_TYPE extends WritableChunk<Values>,OUTPUT_CHUNK_TYPE extends WritableChunk<Values>>

java.lang.Object

io.deephaven.extensions.barrage.chunk.BaseChunkReader<OUTPUT_CHUNK_TYPE>

io.deephaven.extensions.barrage.chunk.TransformingChunkReader<INPUT_CHUNK_TYPE,OUTPUT_CHUNK_TYPE>

Type Parameters:

INPUT_CHUNK_TYPE - the input chunk type

OUTPUT_CHUNK_TYPE - the output chunk type

All Implemented Interfaces:

ChunkReader<OUTPUT_CHUNK_TYPE>

public class TransformingChunkReader<INPUT_CHUNK_TYPE extends WritableChunk<Values>,OUTPUT_CHUNK_TYPE extends WritableChunk<Values>>
extends BaseChunkReader<OUTPUT_CHUNK_TYPE>

A ChunkReader that reads a chunk of wire values and transforms them into a different chunk type.

Nested Class Summary

Nested classes/interfaces inherited from class io.deephaven.extensions.barrage.chunk.BaseChunkReader

BaseChunkReader.ChunkTransformer<READ_CHUNK_TYPE extends Chunk<Values>,DEST_CHUNK_TYPE extends WritableChunk<Values>>

Nested classes/interfaces inherited from interface io.deephaven.extensions.barrage.chunk.ChunkReader

ChunkReader.Factory

Constructor Summary

Constructors

Constructor	Description
TransformingChunkReader(@NotNull ChunkReader<INPUT_CHUNK_TYPE> wireChunkReader, IntFunction<OUTPUT_CHUNK_TYPE> chunkFactory, Function<WritableChunk<Values>,OUTPUT_CHUNK_TYPE> castFunction, BaseChunkReader.ChunkTransformer<INPUT_CHUNK_TYPE,OUTPUT_CHUNK_TYPE> transformer)

Method Summary

Modifier and Type	Method	Description
OUTPUT_CHUNK_TYPE	readChunk(@NotNull Iterator<ChunkWriter.FieldNodeInfo> fieldNodeIter, PrimitiveIterator.OfLong bufferInfoIter, @NotNull DataInput is, @Nullable WritableChunk<Values> outChunk, int outOffset, int totalRows)	Reads the given DataInput to extract the next Arrow buffer as a Deephaven Chunk.

Methods inherited from class io.deephaven.extensions.barrage.chunk.BaseChunkReader

castOrCreateChunk, getChunkTypeFor, readValidityBuffer

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.deephaven.extensions.barrage.chunk.ChunkReader

readChunk

Constructor Details

TransformingChunkReader

public TransformingChunkReader(@NotNull
 @NotNull ChunkReader<INPUT_CHUNK_TYPE> wireChunkReader,
 IntFunction<OUTPUT_CHUNK_TYPE> chunkFactory,
 Function<WritableChunk<Values>,OUTPUT_CHUNK_TYPE> castFunction,
 BaseChunkReader.ChunkTransformer<INPUT_CHUNK_TYPE,OUTPUT_CHUNK_TYPE> transformer)

Method Details

readChunk

public OUTPUT_CHUNK_TYPE readChunk(@NotNull
 @NotNull Iterator<ChunkWriter.FieldNodeInfo> fieldNodeIter,
 @NotNull
 PrimitiveIterator.OfLong bufferInfoIter,
 @NotNull
 @NotNull DataInput is,
 @Nullable
 @Nullable WritableChunk<Values> outChunk,
 int outOffset,
 int totalRows)
                            throws IOException

Description copied from interface: ChunkReader

Reads the given DataInput to extract the next Arrow buffer as a Deephaven Chunk.

Parameters:

fieldNodeIter - iterator to read fields from the stream

bufferInfoIter - iterator to read buffers from the stream

is - input stream containing buffers to be read

outChunk - chunk to write to

outOffset - offset within the outChunk to begin writing

totalRows - total rows to write to the outChunk

Returns:

a Chunk containing the data from the stream

Throws:

IOException - if an error occurred while reading the stream