org.apache.hadoop.fs

类 FSInputStream

java.lang.Object

java.io.InputStream

org.apache.hadoop.fs.FSInputStream

所有已实现的接口:

Closeable, AutoCloseable, PositionedReadable, Seekable

直接已知子类:

ByteRangeInputStream, DFSClient.DFSInputStream, FSInputChecker, FTPInputStream

public abstract class FSInputStream
extends InputStream
implements Seekable, PositionedReadable

FSInputStream is a generic old InputStream with a little bit of RAF-style seek ability.

构造器概要

构造器

构造器和说明
FSInputStream()

方法概要

方法

限定符和类型	方法和说明
abstract long	getPos() Return the current offset from the start of the file
int	read(long position, byte[] buffer, int offset, int length) Read upto the specified number of bytes, from a given position within a file, and return the number of bytes read.
void	readFully(long position, byte[] buffer) Read number of bytes equalt to the length of the buffer, from a given position within a file.
void	readFully(long position, byte[] buffer, int offset, int length) Read the specified number of bytes, from a given position within a file.
abstract void	seek(long pos) Seek to the given offset from the start of the file.
abstract boolean	seekToNewSource(long targetPos) Seeks a different copy of the data.

从类继承的方法 java.io.InputStream

available, close, mark, markSupported, read, read, read, reset, skip

从类继承的方法 java.lang.Object

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

构造器详细资料

FSInputStream

public FSInputStream()

方法详细资料

seek

public abstract void seek(long pos)
                   throws IOException

Seek to the given offset from the start of the file. The next read() will be from that location. Can't seek past the end of the file.

指定者:

seek 在接口中 Seekable

抛出:

IOException

getPos

public abstract long getPos()
                     throws IOException

Return the current offset from the start of the file

指定者:

getPos 在接口中 Seekable

抛出:

IOException

seekToNewSource

public abstract boolean seekToNewSource(long targetPos)
                                 throws IOException

Seeks a different copy of the data. Returns true if found a new source, false otherwise.

指定者:

seekToNewSource 在接口中 Seekable

抛出:

IOException

read

public int read(long position,
       byte[] buffer,
       int offset,
       int length)
         throws IOException

从接口复制的说明: PositionedReadable

Read upto the specified number of bytes, from a given position within a file, and return the number of bytes read. This does not change the current offset of a file, and is thread-safe.

指定者:

read 在接口中 PositionedReadable

抛出:

IOException

readFully

public void readFully(long position,
             byte[] buffer,
             int offset,
             int length)
               throws IOException

从接口复制的说明: PositionedReadable

Read the specified number of bytes, from a given position within a file. This does not change the current offset of a file, and is thread-safe.

指定者:

readFully 在接口中 PositionedReadable

抛出:

IOException

readFully

public void readFully(long position,
             byte[] buffer)
               throws IOException

从接口复制的说明: PositionedReadable

Read number of bytes equalt to the length of the buffer, from a given position within a file. This does not change the current offset of a file, and is thread-safe.

指定者:

readFully 在接口中 PositionedReadable

抛出:

IOException