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## org.apache.hadoop.io.compress.zlib
Class BuiltInZlibDeflater

    java.lang.Object
      java.util.zip.Deflater
          org.apache.hadoop.io.compress.zlib.BuiltInZlibDeflater

All Implemented Interfaces:
  Compressor

    public class BuiltInZlibDeflater

extends Deflater
implements Compressor

A wrapper around java.util.zip.Deflater to make it conform to org.apache.hadoop.io.compress.Compressor interface.

Field Summary

Fields inherited from class java.util.zip.Deflater
`BEST_COMPRESSION, BEST_SPEED, DEFAULT_COMPRESSION, DEFAULT_STRATEGY, DEFLATED, FILTERED, HUFFMAN_ONLY, NO_COMPRESSION`

Constructor Summary
`BuiltInZlibDeflater()`
`BuiltInZlibDeflater(int level)`
`BuiltInZlibDeflater(int level, boolean nowrap)`

Method Summary
`int` | `compress(byte[] b, int off, int len)` Fills specified buffer with compressed data.
`void` | `reinit(Configuration conf)` reinit the compressor with the given configuration.

Methods inherited from class java.util.zip.Deflater
`deflate, deflate, end, finalize, finish, finished, getAdler, getBytesRead, getBytesWritten, getTotalIn, getTotalOut, needsInput, reset, setDictionary, setDictionary, setInput, setInput, setLevel, setStrategy`

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

Methods inherited from interface org.apache.hadoop.io.compress.Compressor
`end, finish, finished, getBytesRead, getBytesWritten, needsInput, reset, setDictionary, setInput`

Constructor Detail

### BuiltInZlibDeflater

    public BuiltInZlibDeflater(int level,
                               boolean nowrap)

### BuiltInZlibDeflater

    public BuiltInZlibDeflater(int level)

### BuiltInZlibDeflater

    public BuiltInZlibDeflater()

Method Detail

### compress

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

  Description copied from interface: `Compressor`
  Fills specified buffer with compressed data. Returns actual number of bytes of compressed data. A return value of 0 indicates that needsInput() should be called in order to determine if more input data is required.

  Specified by:
    `compress` in interface `Compressor`
  Parameters:
    `b` - Buffer for the compressed data
    `off` - Start offset of the data
    `len` - Size of the buffer
  Returns:
    The actual number of bytes of compressed data.
  Throws:
    `IOException`

### reinit

    public void reinit(Configuration conf)

  reinit the compressor with the given configuration. It will reset the compressor's compression level and compression strategy. Different from `ZlibCompressor`, `BuiltInZlibDeflater` only support three kind of compression strategy: FILTERED, HUFFMAN_ONLY and DEFAULT_STRATEGY. It will use DEFAULT_STRATEGY as default if the configured compression strategy is not supported.

  Specified by:
    `reinit` in interface `Compressor`
  Parameters:
    `conf` - Configuration from which new setting are fetched

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Copyright © 2009 The Apache Software Foundation