net.sf.eos.hadoop.mapred
Class AbstractKeyGenerator<K extends WritableComparable>

java.lang.Object
  net.sf.eos.config.Configured
      net.sf.eos.hadoop.mapred.AbstractKeyGenerator<K>

All Implemented Interfaces:

Configurable, KeyGenerator<K>

Direct Known Subclasses:

IdMetadataKeyGenerator, TextMetaKeyGenerator

public abstract class AbstractKeyGenerator<K extends WritableComparable>
extends Configured
implements KeyGenerator<K>

Simple implementation with a factory.

Author:

Sascha Kohlmann

Field Summary

static String

ABSTRACT_KEY_GENERATOR_IMPL_CONFIG_NAME

Constructor Summary

AbstractKeyGenerator()

Method Summary

static AbstractKeyGenerator<? extends WritableComparable>

newInstance(Configuration conf) Creates a new instance.

Methods inherited from class net.sf.eos.config.Configured

configure, getConfiguration

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.eos.hadoop.mapred.KeyGenerator

createKeysForDocument

Field Detail

ABSTRACT_KEY_GENERATOR_IMPL_CONFIG_NAME

@ConfigurationKey(type=CLASSNAME,
                  description="Key generator instances support the generation of keys in the map-reduce map task.")
public static final String ABSTRACT_KEY_GENERATOR_IMPL_CONFIG_NAME

See Also:

Constant Field Values

Constructor Detail

AbstractKeyGenerator

public AbstractKeyGenerator()

Method Detail

newInstance

@FactoryMethod(key="net.sf.eos.hadoop.mapred.AbstractKeyGenerator.impl")
public static final AbstractKeyGenerator<? extends WritableComparable> newInstance(Configuration conf)
                                                                            throws EosException

Creates a new instance.

Parameters:

conf - the configuration with the configuration data for the implementation

Returns:

a new instance

Throws:

EosException - if an error occurs