com.esri.core.geometry
Class ListeningGeometryCursor

java.lang.Object
  com.esri.core.geometry.GeometryCursor
      com.esri.core.geometry.ListeningGeometryCursor

public final class ListeningGeometryCursor
extends GeometryCursor

A GeometryCursor implementation that allows pushing geometries into it. To be used with aggregating operations, OperatorUnion and OperatorConvexHull, when the geometries are not available at the time of the execute method call, but are coming in a stream.

Constructor Summary

ListeningGeometryCursor()

Method Summary

int	getGeometryID() Returns the ID of the current geometry.
Geometry	next() Moves the cursor to the next Geometry.
void	tick(Geometry geom) Call this method to add geometry to the cursor.

Methods inherited from class com.esri.core.geometry.GeometryCursor

tock

Methods inherited from class java.lang.Object

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

Constructor Detail

ListeningGeometryCursor

public ListeningGeometryCursor()

Method Detail

getGeometryID

public int getGeometryID()

Description copied from class: GeometryCursor

Returns the ID of the current geometry. The ID is propagated across the operations (when possible). Returns an ID associated with the current Geometry. The ID is passed along and is returned by some operators to preserve relationship between the input and output geometry classes. It is not always possible to preserve an ID during an operation.

Specified by:

getGeometryID in class GeometryCursor

next

public Geometry next()

Description copied from class: GeometryCursor

Moves the cursor to the next Geometry. Returns null when reached the end. The behavior of the cursor is undefined after the method returns null.

Specified by:

next in class GeometryCursor

tick

public void tick(Geometry geom)

Call this method to add geometry to the cursor. After this method is called, call immediately the tock() method on the GeometryCursor returned by the OperatorUnion (or OperatorConvexHull with b_merge == true). Call next() on the GeometryCursor returned by the OperatorUnion when done listening to incoming geometries to finish the union operation.

Parameters:

geom - The geometry to be pushed into the cursor.