org.datanucleus.jdo.spatial
Class PgSpatialHelper

java.lang.Object
  org.datanucleus.jdo.spatial.SpatialHelper
      org.datanucleus.jdo.spatial.PgSpatialHelper

public class PgSpatialHelper
extends SpatialHelper

Helper class to read Spatial MetaData from the datastore, specialized for the geometry classes of the PostGIS JDBC driver. The methods assumes that users know what they're doing and will automatically downcast query results to org.postgis.Geometry.

Version:

$Revision: 1.1 $

Nested Class Summary

Nested classes/interfaces inherited from class org.datanucleus.jdo.spatial.SpatialHelper

SpatialHelper.QueryExecutor

Field Summary

Fields inherited from class org.datanucleus.jdo.spatial.SpatialHelper

pmf, storeMgr

Constructor Summary

PgSpatialHelper(org.datanucleus.jdo.JDOPersistenceManagerFactory pmf)
Creates a new PgSpatialHelper instance for the given PMF.

Method Summary

java.lang.Integer	getSridFromDatastoreEntry(java.lang.Class pc, java.lang.String fieldName) Returns the srid of the first datastore entry for the given geometry field.
java.lang.Integer	getSridFromDatastoreEntry(java.lang.Class pc, java.lang.String fieldName, javax.jdo.PersistenceManager pm) Returns the srid of the first datastore entry for the given geometry field.

Methods inherited from class org.datanucleus.jdo.spatial.SpatialHelper

calculateBoundsInDatastore, calculateBoundsInDatastore, checkValid, estimateBoundsFromDatastoreMetadata, estimateBoundsFromDatastoreMetadata, getAdapter, getColumn, getColumn, getCrsNameForSrid, getCrsNameForSrid, getCrsWktForSrid, getCrsWktForSrid, getDimensionFromJdoMetadata, getGeometryColumnBackedFields, getIntegerFromJdoMetadata, getMetaDataManager, getSridFromDatastoreMetadata, getSridFromDatastoreMetadata, getSridFromJdoMetadata, getTable, getValueFromJdoMetadata, isGeometryColumnBackedField, isGeometryColumnBackedField, readFirstValueForField

Methods inherited from class java.lang.Object

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

Constructor Detail

PgSpatialHelper

public PgSpatialHelper(org.datanucleus.jdo.JDOPersistenceManagerFactory pmf)

Creates a new PgSpatialHelper instance for the given PMF.

Parameters:

pmf - The PMF, can't be null or closed.

Method Detail

getSridFromDatastoreEntry

public java.lang.Integer getSridFromDatastoreEntry(java.lang.Class pc,
                                                   java.lang.String fieldName)

Returns the srid of the first datastore entry for the given geometry field. Will return null, if there are no entries or if the geometry field of the first entry is null. Creates a new PersistenceManager to execute the query on the datastore.

Parameters:

pc - The PersistenceCapapable class

fieldName - Name of the geometry field

Returns:

The srid or null

getSridFromDatastoreEntry

public java.lang.Integer getSridFromDatastoreEntry(java.lang.Class pc,
                                                   java.lang.String fieldName,
                                                   javax.jdo.PersistenceManager pm)

Returns the srid of the first datastore entry for the given geometry field. Will return null, if there are no entries or if the geometry field of the first entry is null.

Parameters:

pc - The PersistenceCapapable class

fieldName - Name of the geometry field

pm - PersistenceManager instance that should be used to access the datastore

Returns:

The srid or null