InputStream: InputStream classes
In arrow: Integration to 'Apache' 'Arrow'
InputStream R Documentation
InputStream classes
Description
RandomAccessFile inherits from InputStream and is a base
class for: ReadableFile for reading from a file; MemoryMappedFile for
the same but with memory mapping; and BufferReader for reading from a
buffer. Use these with the various table readers.
Factory
The $create() factory methods instantiate the InputStream object and
take the following arguments, depending on the subclass:
-
path For ReadableFile, a character file name
-
x For BufferReader, a Buffer or an object that can be
made into a buffer via buffer().
To instantiate a MemoryMappedFile, call mmap_open().
Methods
-
$GetSize():
-
$supports_zero_copy(): Logical
-
$seek(position): go to that position in the stream
-
$tell(): return the position in the stream
-
$close(): close the stream
-
$Read(nbytes): read data from the stream, either a specified nbytes or
all, if nbytes is not provided
-
$ReadAt(position, nbytes): similar to $seek(position)$Read(nbytes)
-
$Resize(size): for a MemoryMappedFile that is writeable
arrow documentation built on Nov. 25, 2023, 1:09 a.m.
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| InputStream | R Documentation |
InputStream classes
Description
RandomAccessFile inherits from InputStream and is a base
class for: ReadableFile for reading from a file; MemoryMappedFile for
the same but with memory mapping; and BufferReader for reading from a
buffer. Use these with the various table readers.
Factory
The $create() factory methods instantiate the InputStream object and
take the following arguments, depending on the subclass:
-
pathForReadableFile, a character file name -
xForBufferReader, a Buffer or an object that can be made into a buffer viabuffer().
To instantiate a MemoryMappedFile, call mmap_open().
Methods
-
$GetSize(): -
$supports_zero_copy(): Logical -
$seek(position): go to that position in the stream -
$tell(): return the position in the stream -
$close(): close the stream -
$Read(nbytes): read data from the stream, either a specifiednbytesor all, ifnbytesis not provided -
$ReadAt(position, nbytes): similar to$seek(position)$Read(nbytes) -
$Resize(size): for aMemoryMappedFilethat is writeable
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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