org.apache.commons.io.input

Class BufferedFileChannelInputStream

java.lang.Object

java.io.InputStream

org.apache.commons.io.input.BufferedFileChannelInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public final class BufferedFileChannelInputStream
extends InputStream

InputStream implementation which uses direct buffer to read a file to avoid extra copy of data between Java and native memory which happens when using BufferedInputStream. Unfortunately, this is not something already available in JDK, sun.nio.ch.ChannelInputStream supports reading a file using NIO, but does not support buffering.

This class was ported and adapted from Apache Spark commit 933dc6cb7b3de1d8ccaf73d124d6eb95b947ed19 where it was called NioBufferedFileInputStream.

Since:

2.9.0

Constructor Summary

Constructors

Constructor and Description
BufferedFileChannelInputStream(File file) Constructs a new instance for the given File.
BufferedFileChannelInputStream(File file, int bufferSizeInBytes) Constructs a new instance for the given File and buffer size.
BufferedFileChannelInputStream(Path path) Constructs a new instance for the given Path.
BufferedFileChannelInputStream(Path path, int bufferSizeInBytes) Constructs a new instance for the given Path and buffer size.

Method Summary

Modifier and Type	Method and Description
int	available()
void	close()
int	read()
int	read(byte[] b, int offset, int len)
long	skip(long n)

Methods inherited from class java.io.InputStream

mark, markSupported, read, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

BufferedFileChannelInputStream

public BufferedFileChannelInputStream(File file)
                               throws IOException

Constructs a new instance for the given File.

Parameters:

file - The file to stream.

Throws:

IOException - If an I/O error occurs

BufferedFileChannelInputStream

public BufferedFileChannelInputStream(File file,
                                      int bufferSizeInBytes)
                               throws IOException

Constructs a new instance for the given File and buffer size.

Parameters:

file - The file to stream.

bufferSizeInBytes - buffer size.

Throws:

IOException - If an I/O error occurs

BufferedFileChannelInputStream

public BufferedFileChannelInputStream(Path path)
                               throws IOException

Constructs a new instance for the given Path.

Parameters:

path - The path to stream.

Throws:

IOException - If an I/O error occurs

BufferedFileChannelInputStream

public BufferedFileChannelInputStream(Path path,
                                      int bufferSizeInBytes)
                               throws IOException

Constructs a new instance for the given Path and buffer size.

Parameters:

path - The path to stream.

bufferSizeInBytes - buffer size.

Throws:

IOException - If an I/O error occurs

Method Detail

available

public int available()
              throws IOException

Overrides:

available in class InputStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class InputStream

Throws:

IOException

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

public int read(byte[] b,
                int offset,
                int len)
         throws IOException

Overrides:

read in class InputStream

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Overrides:

skip in class InputStream

Throws:

IOException