ilog.views.maps.format.oracle.objectmodel

Interface IlvObjectSDOKeyExtractor

All Superinterfaces:

IlvPersistentObject

All Known Implementing Classes:

IlvDefaultObjectSDOKeyExtractor

public interface IlvObjectSDOKeyExtractor
extends IlvPersistentObject

An IlvObjectSDOKeyExtractor extracts feature ID or key of geometries stored in a database.

The purpose of keys in databases is to allow you to identify a geometry by a unique ID. These keys are often composed of a unique column in the database, but are not limited to. A key can be composed from values stored in multiple columns.

The key extractor is used by the IlvObjectSDOFeatureIterator to extract keys from ResultSets, then this key is associated with generated features as feature ID.

Typical use of extracted keys is to prevent tile loaders from loading multiple times a geometry belonging to multiple tiles.

Since:

JViews 3.5

See Also:

IlvObjectSDOFeatureIterator, IlvObjectSDOLayer

Method Summary

Modifier and Type	Method and Description
Object	extractKey(ResultSet set) Extracts the key from the current row of the specified ResultSet.
boolean	isPersistent() Returns true if this IlvObjectSDOKeyExtractor is persistent.

Methods inherited from interface ilog.views.io.IlvPersistentObject

write

Method Detail

extractKey

Object extractKey(ResultSet set)
           throws IlvSDOException

Extracts the key from the current row of the specified ResultSet.

Parameters:

set - The ResultSet where the key is to be extracted.

Returns:

An Object used as feature ID for the current row.

Throws:

IlvSDOException

isPersistent

boolean isPersistent()

Returns true if this IlvObjectSDOKeyExtractor is persistent.