deegree 2.5 (2011/06/29 09:44 build-8-official)

org.deegree.io.datastore.sql.idgenerator
Class DBMaxIdGenerator

java.lang.Object
  extended by org.deegree.io.datastore.idgenerator.IdGenerator
      extended by org.deegree.io.datastore.sql.idgenerator.DBMaxIdGenerator

public class DBMaxIdGenerator
extends IdGenerator

Feature id generator that produces successive (+1) values and retrieves its start value from the specified table value (the maximum stored in the field).

Please note that aborted transactions will also increase ids, so feature ids may be skipped.

Version:
$Revision: 6588 $, $Date: 2007-04-11 17:31:29 +0200 (Mi, 11 Apr 2007) $
Author:
Christoph Pollmann, Markus Schneider, last edited by: $Author: mschneider $

Field Summary
 
Fields inherited from class org.deegree.io.datastore.idgenerator.IdGenerator
ft, params, TYPE_UUID
 
Constructor Summary
DBMaxIdGenerator(java.util.Properties params)
          Creates a new DBMaxIdGenerator instance.
 
Method Summary
 java.lang.Object getNewId(DatastoreTransaction ta)
          Returns a new primary key.
 FeatureId getNewId(MappedFeatureType ft, DatastoreTransaction ta)
          Returns a new id for a feature of the given type.
 
Methods inherited from class org.deegree.io.datastore.idgenerator.IdGenerator
getInstance
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DBMaxIdGenerator

public DBMaxIdGenerator(java.util.Properties params)
                 throws IdGenerationException
Creates a new DBMaxIdGenerator instance.

Supported configuration parameters:

Name optional? Usage
table no name of the table where the id field is stored
column no name of the id field

Parameters:
params - configuration parameters
Throws:
IdGenerationException
Method Detail

getNewId

public java.lang.Object getNewId(DatastoreTransaction ta)
                          throws IdGenerationException
Returns a new primary key.

Specified by:
getNewId in class IdGenerator
Parameters:
ta - datastore transaction (context)
Returns:
a new primary key.
Throws:
IdGenerationException - if the generation of the id could not be performed

getNewId

public FeatureId getNewId(MappedFeatureType ft,
                          DatastoreTransaction ta)
                   throws IdGenerationException
Returns a new id for a feature of the given type.

Specified by:
getNewId in class IdGenerator
Parameters:
ft - (mapped) feature type
ta - datastore transaction (context)
Returns:
a new feature id.
Throws:
IdGenerationException - if the generation of the id could not be performed

deegree 2.5 (2011/06/29 09:44 build-8-official)

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