org.bytedeco.arrow

Class Reader

java.lang.Object

org.bytedeco.javacpp.Pointer

org.bytedeco.arrow.Reader

All Implemented Interfaces:

AutoCloseable

@Namespace(value="arrow::ipc::feather")
 @Properties(inherit=arrow.class)
public class Reader
extends Pointer

\class Reader \brief An interface for reading columns from Feather files

Nested Class Summary

Nested classes/interfaces inherited from class org.bytedeco.javacpp.Pointer

Pointer.CustomDeallocator, Pointer.Deallocator, Pointer.NativeDeallocator, Pointer.ReferenceCounter

Field Summary

Fields inherited from class org.bytedeco.javacpp.Pointer

address, capacity, limit, position

Constructor Summary

Constructors

Constructor and Description
Reader(Pointer p) Pointer cast constructor.

Method Summary

Modifier and Type	Method and Description
static FeatherReaderResult	Open(RandomAccessFile source) \brief Open a Feather file from a RandomAccessFile interface
Status	Read(int[] indices, Table out)
Status	Read(IntBuffer indices, Table out)
Status	Read(IntPointer indices, Table out) \brief Read only the specified columns from the file as an arrow::Table.
Status	Read(StringVector names, Table out) \brief Read only the specified columns from the file as an arrow::Table.
Status	Read(Table out) \brief Read all columns from the file as an arrow::Table.
Schema	schema()
int	version() \brief Return the version number of the Feather file

Methods inherited from class org.bytedeco.javacpp.Pointer

address, asBuffer, asByteBuffer, availablePhysicalBytes, calloc, capacity, capacity, close, deallocate, deallocate, deallocateReferences, deallocator, deallocator, equals, fill, formatBytes, free, getPointer, getPointer, getPointer, getPointer, hashCode, isNull, isNull, limit, limit, malloc, maxBytes, maxPhysicalBytes, memchr, memcmp, memcpy, memmove, memset, offsetof, offsetof, parseBytes, physicalBytes, position, position, put, realloc, referenceCount, releaseReference, retainReference, setNull, sizeof, sizeof, toString, totalBytes, totalCount, totalPhysicalBytes, withDeallocator, zero

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Reader

public Reader(Pointer p)

Pointer cast constructor. Invokes Pointer(Pointer).

Method Detail

Open

@ByVal
public static FeatherReaderResult Open(@SharedPtr @Cast(value={"","std::shared_ptr<arrow::io::RandomAccessFile>"})
                                               RandomAccessFile source)

\brief Open a Feather file from a RandomAccessFile interface

Parameters:

source - [in] a RandomAccessFile instance

Returns:

the table reader

version

public int version()

\brief Return the version number of the Feather file

schema

@SharedPtr
 @ByVal
public Schema schema()

Read

@ByVal
public Status Read(@SharedPtr
                           Table out)

\brief Read all columns from the file as an arrow::Table.

Parameters:

out - [out] the returned table

Returns:

Status This function is zero-copy if the file source supports zero-copy reads

Read

@ByVal
public Status Read(@StdVector
                           IntPointer indices,
                           @SharedPtr
                           Table out)

\brief Read only the specified columns from the file as an arrow::Table.

Parameters:

indices - [in] the column indices to read

out - [out] the returned table

Returns:

Status This function is zero-copy if the file source supports zero-copy reads

Read

@ByVal
public Status Read(@StdVector
                           IntBuffer indices,
                           @SharedPtr
                           Table out)

Read

@ByVal
public Status Read(@StdVector
                           int[] indices,
                           @SharedPtr
                           Table out)

Read

@ByVal
public Status Read(@Const @ByRef
                           StringVector names,
                           @SharedPtr
                           Table out)

\brief Read only the specified columns from the file as an arrow::Table.

Parameters:

names - [in] the column names to read

out - [out] the returned table

Returns:

Status This function is zero-copy if the file source supports zero-copy reads