net.sf.eos.hadoop.mapred
Interface KeyGenerator<K extends WritableComparable>

Type Parameters:

K - the type of the key in a mapreduce environment

All Known Implementing Classes:

AbstractKeyGenerator, IdMetadataKeyGenerator, TextMetaKeyGenerator

public interface KeyGenerator<K extends WritableComparable>

The key generator creates a key for the given document. The advantage is the support for replaceable strategies in key generation.

Implementations must be stateless.

Author:

Sascha Kohlmann

Method Summary

Map<K,EosDocument>

createKeysForDocument(EosDocument doc) Creates a new key.

Method Detail

createKeysForDocument

Map<K,EosDocument> createKeysForDocument(EosDocument doc)
                                                                    throws EosException

Creates a new key.

Parameters:

doc - the document to create a key for

Returns:

the key

Throws:

EosException - if an error occurs