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

    java.lang.Object
      org.apache.hadoop.io.compress.CompressionCodecFactory

    public class CompressionCodecFactory

extends Object

A factory that will find the correct codec for a given filename.

Field Summary
`static org.apache.commons.logging.Log` | `LOG`

Constructor Summary
`CompressionCodecFactory(Configuration conf)` Find the codecs specified in the config value io.compression.codecs and register them.

Method Summary
`CompressionCodec` | `getCodec(Path file)` Find the relevant compression codec for the given file based on its filename suffix.
`static List<Class<? extends CompressionCodec>>` | `getCodecClasses(Configuration conf)` Get the list of codecs listed in the configuration
`static void` | `main(String[] args)` A little test program.
`static String` | `removeSuffix(String filename, String suffix)` Removes a suffix from a filename, if it has it.
`static void` | `setCodecClasses(Configuration conf, List<Class> classes)` Sets a list of codec classes in the configuration.
`String` | `toString()` Print the extension map out as a string.

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

Field Detail

### LOG

    public static final org.apache.commons.logging.Log LOG

Constructor Detail

### CompressionCodecFactory

    public CompressionCodecFactory(Configuration conf)

  Find the codecs specified in the config value io.compression.codecs and register them. Defaults to gzip and zip.

Method Detail

### toString

    public String toString()

  Print the extension map out as a string.

  Overrides:
    `toString` in class `Object`

### getCodecClasses

    public static List<Class<? extends CompressionCodec>> getCodecClasses(Configuration conf)

  Get the list of codecs listed in the configuration

  Parameters:
    `conf` - the configuration to look in
  Returns:
    a list of the Configuration classes or null if the attribute was not set

### setCodecClasses

    public static void setCodecClasses(Configuration conf,
                                       List<Class> classes)

  Sets a list of codec classes in the configuration.

  Parameters:
    `conf` - the configuration to modify
    `classes` - the list of classes to set

### getCodec

    public CompressionCodec getCodec(Path file)

  Find the relevant compression codec for the given file based on its filename suffix.

  Parameters:
    `file` - the filename to check
  Returns:
    the codec object

### removeSuffix

    public static String removeSuffix(String filename,
                                      String suffix)

  Removes a suffix from a filename, if it has it.

  Parameters:
    `filename` - the filename to strip
    `suffix` - the suffix to remove
  Returns:
    the shortened filename

### main

    public static void main(String[] args)
                     throws Exception

  A little test program.

  Parameters:
    `args` -
  Throws:
    `Exception`

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Copyright © 2009 The Apache Software Foundation