ilog.views.maps.format.oracle.objectmodel

Class IlvDefaultObjectSDOKeyExtractor

java.lang.Object

ilog.views.maps.format.oracle.objectmodel.IlvDefaultObjectSDOKeyExtractor

All Implemented Interfaces:

IlvPersistentObject, IlvObjectSDOKeyExtractor

public class IlvDefaultObjectSDOKeyExtractor
extends Object
implements IlvObjectSDOKeyExtractor

This implementation of IlvObjectSDOKeyExtractor extracts unique IDs from a given layer column. This class is useful for load-on-demand: if you have an SDO layer that has a column containing unique values associated with the SDO_GEOMETRY values, then you can use this class. Using a key extractor prevents the tile loader from loading multiple times a geometry belonging to multiple tiles.

Since:

JViews 5.5

See Also:

IlvObjectSDOKeyExtractor

Constructor Summary

Constructors

Constructor and Description
IlvDefaultObjectSDOKeyExtractor(IlvInputStream stream) Reads this object from the specified stream.
IlvDefaultObjectSDOKeyExtractor(String columnName) Constructs a new IlvDefaultObjectSDOKeyExtractor.

Method Summary

Modifier and Type	Method and Description
Object	extractKey(ResultSet set) This method returns an Object that is used as a feature ID.
String	getColumnName() Returns the name of the decoded column.
boolean	isPersistent() Returns true.
void	write(IlvOutputStream stream) Writes this object to the specified stream.

Methods inherited from class java.lang.Object

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

Constructor Detail

IlvDefaultObjectSDOKeyExtractor

public IlvDefaultObjectSDOKeyExtractor(String columnName)

Constructs a new IlvDefaultObjectSDOKeyExtractor.

Parameters:

columnName - The name of the column of the SDO layer.

IlvDefaultObjectSDOKeyExtractor

public IlvDefaultObjectSDOKeyExtractor(IlvInputStream stream)
                                throws IlvReadFileException

Reads this object from the specified stream.

Parameters:

stream - The stream.

Throws:

IlvReadFileException

Method Detail

extractKey

public Object extractKey(ResultSet set)
                  throws IlvSDOException

This method returns an Object that is used as a feature ID. The returned Object is unique and retrieved from a column containing unique values, so that when the IlvDefaultObjectSDOKeyExtractor is associated with an IlvDefaultObjectSDOTileLoader, it prevents the tile loader from loading multiple times a geometry belonging to multiple tiles.

Specified by:

extractKey in interface IlvObjectSDOKeyExtractor

Parameters:

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

Returns:

An Object used as feature ID for the current row.

Throws:

IlvSDOException

write

public void write(IlvOutputStream stream)
           throws IOException

Writes this object to the specified stream.

Specified by:

write in interface IlvPersistentObject

Parameters:

stream - The stream.

Throws:

IOException - thrown when an exception occurs during the write operation for this object.

isPersistent

public boolean isPersistent()

Returns true.

Specified by:

isPersistent in interface IlvObjectSDOKeyExtractor

getColumnName

public String getColumnName()

Returns the name of the decoded column.