CompressionInputStream (Hadoop 1.2.1 API)
Date: 2013-07-22

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## org.apache.hadoop.io.compress
Class CompressionInputStream

    java.lang.Object
      java.io.InputStream
          org.apache.hadoop.io.compress.CompressionInputStream

All Implemented Interfaces:
  Closeable, Seekable

Direct Known Subclasses:
  DecompressorStream, SplitCompressionInputStream

    public abstract class CompressionInputStream

extends InputStream
implements Seekable

A compression input stream.

Implementations are assumed to be buffered. This permits clients to reposition the underlying input stream then call `resetState()`, without having to also synchronize client buffers.

Field Summary
`protected InputStream` | `in` The input stream to be compressed.
`protected long` | `maxAvailableData`

Constructor Summary
`protected` | `CompressionInputStream(InputStream in)` Create a compression input stream that reads the decompressed bytes from the given stream.

Method Summary
`void` | `close()`
`long` | `getPos()` This method returns the current position in the stream.
`abstract int` | `read(byte[] b, int off, int len)` Read bytes from the stream.
`abstract void` | `resetState()` Reset the decompressor to its initial state and discard any buffered data, as the underlying stream may have been repositioned.
`void` | `seek(long pos)` This method is current not supported.
`boolean` | `seekToNewSource(long targetPos)` This method is current not supported.

Methods inherited from class java.io.InputStream
`available, mark, markSupported, read, read, reset, skip`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### in

    protected final InputStream in

  The input stream to be compressed.

### maxAvailableData

    protected long maxAvailableData

Constructor Detail

### CompressionInputStream

    protected CompressionInputStream(InputStream in)
                              throws IOException

  Create a compression input stream that reads the decompressed bytes from the given stream.

  Parameters:
    `in` - The input stream to be compressed.
  Throws:
    `IOException`

Method Detail

### close

    public void close()
               throws IOException

  Specified by:
    `close` in interface `Closeable`
  Overrides:
    `close` in class `InputStream`
  Throws:
    `IOException`

### read

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

  Read bytes from the stream. Made abstract to prevent leakage to underlying stream.

  Overrides:
    `read` in class `InputStream`
  Throws:
    `IOException`

### resetState

    public abstract void resetState()
                             throws IOException

  Reset the decompressor to its initial state and discard any buffered data, as the underlying stream may have been repositioned.

  Throws:
    `IOException`

### getPos

    public long getPos()
                throws IOException

  This method returns the current position in the stream.

  Specified by:
    `getPos` in interface `Seekable`
  Returns:
    Current position in stream as a long
  Throws:
    `IOException`

### seek

    public void seek(long pos)
              throws UnsupportedOperationException

  This method is current not supported.

  Specified by:
    `seek` in interface `Seekable`
  Throws:
    `UnsupportedOperationException`

### seekToNewSource

    public boolean seekToNewSource(long targetPos)
                            throws UnsupportedOperationException

  This method is current not supported.

  Specified by:
    `seekToNewSource` in interface `Seekable`
  Throws:
    `UnsupportedOperationException`

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Copyright © 2009 The Apache Software Foundation