org.deegree.io.datastore.idgenerator
Class IdGenerator

java.lang.Object
  org.deegree.io.datastore.idgenerator.IdGenerator

Direct Known Subclasses:

DBMaxIdGenerator, DBSeqIdGenerator, ParentIDGenerator, UUIDGenerator

public abstract class IdGenerator
extends Object

Abstract base class for generators that are used to create primary keys (especially FeatureIds).

Version:

$Revision: 9342 $, $Date: 2007-12-27 13:32:57 +0100 (Do, 27 Dez 2007) $

Author:

Markus Schneider , last edited by: $Author: apoth $

Field Summary

protected MappedFeatureType	ft
protected Properties	params
static String	TYPE_UUID Default generator type based on UUIDs.

Constructor Summary

protected

IdGenerator(Properties params) Creates a new IdGenerator instance.

Method Summary

static IdGenerator	getInstance(String type, Properties params) Returns a concrete IdGenerator instance which is identified by the given type code.
abstract Object	getNewId(DatastoreTransaction ta) Returns a new primary key.
abstract FeatureId	getNewId(MappedFeatureType ft, DatastoreTransaction ta) Returns a new id for a feature of the given type.

Methods inherited from class java.lang.Object

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

Field Detail

TYPE_UUID

public static String TYPE_UUID

Default generator type based on UUIDs.

params

protected Properties params

ft

protected MappedFeatureType ft

Constructor Detail

IdGenerator

protected IdGenerator(Properties params)

Creates a new IdGenerator instance.

Parameters:

params - configuration parameters

Method Detail

getNewId

public abstract Object getNewId(DatastoreTransaction ta)
                         throws IdGenerationException

Returns a new primary key.

Parameters:

ta - datastore transaction (context)

Returns:

a new primary key.

Throws:

IdGenerationException - if the generation of the id could not be performed

getNewId

public abstract FeatureId getNewId(MappedFeatureType ft,
                                   DatastoreTransaction ta)
                            throws IdGenerationException

Returns a new id for a feature of the given type.

Parameters:

ft - feature type

ta - datastore transaction (context)

Returns:

a new feature id.

Throws:

IdGenerationException

getInstance

public static final IdGenerator getInstance(String type,
                                            Properties params)

Returns a concrete IdGenerator instance which is identified by the given type code.

Parameters:

type - type code

params - initialization parameters for the IdGenerator

Returns:

concrete IdGenerator instance