ilog.views.maps

Interface IlvLookAheadFeatureIterator

All Superinterfaces:

IlvMapFeatureIterator

All Known Implementing Classes:

IlvObjectSDOFeatureIterator, IlvShapeFileReader, IlvSHPReader

public interface IlvLookAheadFeatureIterator
extends IlvMapFeatureIterator

Defines an interface for feature iterators that have a look ahead ability. Feature iterators implementing this interface can fetch the ID of the next feature that will be returned by getNextFeature, and skip the next feature. This behavior is needed for optimization in cases where the ID allows you to decide if the next feature is to be read fully or not.

Since:

JViews 4.0

See Also:

IlvMapFeatureIterator

Method Summary

Modifier and Type	Method and Description
Object	getNextFeatureId() Returns the ID of the next feature that will be returned by this feature iterator.
boolean	skipNextFeature() Skips the next feature.

Methods inherited from interface ilog.views.maps.IlvMapFeatureIterator

dispose, getCoordinateSystem, getDefaultFeatureRenderer, getLowerRightCorner, getNextFeature, getUpperLeftCorner, isGeoreferenced

Method Detail

getNextFeatureId

Object getNextFeatureId()
                 throws IOException

Returns the ID of the next feature that will be returned by this feature iterator. When this method returns null, it does not mean that there are no more features available, but only that no more IDs are available.

Returns:

The next feature ID, or null if no more feature IDs are available.

Throws:

IOException

skipNextFeature

boolean skipNextFeature()
                 throws IOException

Skips the next feature. The feature normally returned by getNextFeature() is skipped.

Returns:

true if the skipped feature is not the last feature. In JViews 4.0, the return type of this method was void.

Throws:

IOException

Since:

JViews 5.0