org.apache.hadoop.fs

接口 Seekable

所有已知实现类:

BlockDecompressorStream, BufferedFSInputStream, ByteRangeInputStream, CompressionInputStream, DecompressorStream, DFSClient.DFSDataInputStream, DFSClient.DFSInputStream, DFSClient.RemoteBlockReader, FSDataInputStream, FSInputChecker, FSInputStream, FTPInputStream, SplitCompressionInputStream

public interface Seekable

Stream that permits seeking.

方法概要

方法

限定符和类型	方法和说明
long	getPos() Return the current offset from the start of the file
void	seek(long pos) Seek to the given offset from the start of the file.
boolean	seekToNewSource(long targetPos) Seeks a different copy of the data.

方法详细资料

seek

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.

抛出:

IOException

getPos

long getPos()
            throws IOException

Return the current offset from the start of the file

抛出:

IOException

seekToNewSource

boolean seekToNewSource(long targetPos)
                        throws IOException

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

抛出:

IOException