oracle.spatial.network.nfe.vis.maps.index

Class RTreeIndex

java.lang.Object

oracle.spatial.network.nfe.vis.maps.index.AbstractSpatialIndex

oracle.spatial.network.nfe.vis.maps.index.RTreeIndex

All Implemented Interfaces:

java.io.Serializable

public class RTreeIndex
extends AbstractSpatialIndex
implements java.io.Serializable

Defines an RTree spatial index for a 2 dimensional space.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
RTreeIndex() Creates a new instance

Method Summary

Modifier and Type	Method and Description
boolean	addEntry(GeoObject feature) Adds an entry to the index
boolean	create(java.util.Properties props) Creates the Rtree index with the given properties.
boolean	create(java.util.Properties props, java.util.List<GeoObject> features) Creates the Rtree object with the input features using their MBR's.
RTree	getTree() Returns the internal Rtree structure
boolean	removeEntry(GeoObject feature) Removes an entry from the index
java.util.List<GeoObject>	searchEntries(java.awt.geom.Rectangle2D mbr) Returns all the entry that interact with the giveb MBR

Methods inherited from class oracle.spatial.network.nfe.vis.maps.index.AbstractSpatialIndex

getProperties

Methods inherited from class java.lang.Object

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

Constructor Detail

RTreeIndex

public RTreeIndex()

Creates a new instance

Method Detail

getTree

public RTree getTree()

Returns the internal Rtree structure

Returns:

create

public boolean create(java.util.Properties props)

Creates the Rtree index with the given properties.

Specified by:

create in class AbstractSpatialIndex

Parameters:

props - the tree properties, which are: nodesize: the number of entries per node. Since this is a RAM- resident tree there is no need to match node size with disk pages and node sizes of 5-12 will give best results. Value 8 is used if this property is not defined. minimumFill: the number of entries in a node below which the node is considered underfull and the remaining entries orphaned and reinserted in the tree. If set to 1, there will be no orphaning. Value 1 is used if this property is not defined.

Returns:

true if the Rtree could be initialized

create

public boolean create(java.util.Properties props,
                      java.util.List<GeoObject> features)

Creates the Rtree object with the input features using their MBR's.

Specified by:

create in class AbstractSpatialIndex

Parameters:

props - the tree properties, which are: nodesize: the number of entries per node. Since this is a RAM- resident tree there is no need to match node size with disk pages and node sizes of 5-12 will give best results. Value 8 is used if this property is not defined. minimumFill: the number of entries in a node below which the node is considered underfull and the remaining entries orphaned and reinserted in the tree. If set to 1, there will be no orphaning. Value 1 is used if this property is not defined.

features -

Returns:

addEntry

public boolean addEntry(GeoObject feature)
                 throws java.lang.Exception

Adds an entry to the index

Specified by:

addEntry in class AbstractSpatialIndex

Parameters:

feature -

Returns:

true if the entry could be added

Throws:

java.lang.Exception

removeEntry

public boolean removeEntry(GeoObject feature)
                    throws java.lang.Exception

Removes an entry from the index

Specified by:

removeEntry in class AbstractSpatialIndex

Parameters:

feature -

Returns:

true if the entry could be removed

Throws:

java.lang.Exception

searchEntries

public java.util.List<GeoObject> searchEntries(java.awt.geom.Rectangle2D mbr)

Returns all the entry that interact with the giveb MBR

Specified by:

searchEntries in class AbstractSpatialIndex

Parameters:

mbr -

Returns:

a list of geo-objects that interact with the MBR