Package org.geotools.data.collection

Class SpatialIndexFeatureCollection

Object

SpatialIndexFeatureCollection

All Implemented Interfaces:

SimpleFeatureCollection, FeatureCollection<SimpleFeatureType,SimpleFeature>

public class SpatialIndexFeatureCollection
extends Object
implements SimpleFeatureCollection

FeatureCollection used to stage information for display using a SpatialIndex.

Please note that this feature collection cannot be modified after the spatial index is created.

Author:

Jody

Field Summary

Fields

Modifier and Type	Field	Description
protected STRtree	index	SpatialIndex holding the contents of the FeatureCollection
protected List<CollectionListener>	listeners	Listeners
protected SimpleFeatureType	schema

Constructor Summary

Constructors

Constructor	Description
SpatialIndexFeatureCollection()
SpatialIndexFeatureCollection(SimpleFeatureType schema)
SpatialIndexFeatureCollection(SimpleFeatureCollection copy)

Method Summary

Modifier and Type	Method	Description
void	accepts(FeatureVisitor visitor, ProgressListener listener)	Visit the contents of a feature collection.
boolean	add(SimpleFeature feature)
boolean	addAll(Collection<? extends SimpleFeature> collection)
boolean	addAll(FeatureCollection<? extends SimpleFeatureType,? extends SimpleFeature> collection)
void	addListener(CollectionListener listener)
void	clear()
void	close(Iterator<SimpleFeature> close)
void	close(FeatureIterator<SimpleFeature> close)
boolean	contains(Object obj)
boolean	containsAll(Collection<?> collection)
SimpleFeatureIterator	features()	Obtain a SimpleFeatureIterator of the Features within this SimpleFeatureCollection.
protected void	fire(SimpleFeature[] features, int eventType)
ReferencedEnvelope	getBounds()	Get the total bounds of this collection which is calculated by doing a union of the bounds of each feature inside of it
String	getID()	ID used when serializing to GML
SimpleFeatureType	getSchema()	The schema for the child feature members of this collection.
boolean	isEmpty()	Returns true if this feature collection contains no features.
Iterator<SimpleFeature>	iterator()
void	purge()
boolean	remove(Object o)
boolean	removeAll(Collection<?> c)
void	removeListener(CollectionListener listener)
boolean	retainAll(Collection<?> c)
int	size()	Will build the STRtree index if required.
SimpleFeatureCollection	sort(SortBy order)	Obtained sorted contents.
SimpleFeatureCollection	subCollection(Filter filter)	SimpleFeatureCollection "view" indicated by provided filter.
Object[]	toArray()
<O> O[]	toArray(O[] array)

Methods inherited from class Object

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

Field Details

index

protected STRtree index

SpatialIndex holding the contents of the FeatureCollection

schema

protected SimpleFeatureType schema

listeners

protected List<CollectionListener> listeners

Listeners

Constructor Details

SpatialIndexFeatureCollection

public SpatialIndexFeatureCollection()

SpatialIndexFeatureCollection

public SpatialIndexFeatureCollection(SimpleFeatureType schema)

SpatialIndexFeatureCollection

public SpatialIndexFeatureCollection(SimpleFeatureCollection copy)
                              throws IOException

Throws:

IOException

Method Details

addListener

public void addListener(CollectionListener listener)
                 throws NullPointerException

Throws:

NullPointerException

removeListener

public void removeListener(CollectionListener listener)
                    throws NullPointerException

Throws:

NullPointerException

fire

protected void fire(SimpleFeature[] features,
 int eventType)

features

public SimpleFeatureIterator features()

Description copied from interface: SimpleFeatureCollection

Obtain a SimpleFeatureIterator of the Features within this SimpleFeatureCollection.

The implementation of FeatureIterator must adhere to the rules of fail-fast concurrent modification. In addition (to allow for resource backed collections) the SimpleFeatureIterator.close() method must be called.

Example use:

 SimpleFeatureIterator iterator=collection.features();
 try {
     while( iterator.hasNext()  ){
          SimpleFeature feature = iterator.next();
          System.out.println( feature.getID() );
     }
 }
 finally {
     iterator.close();
 }
 

Specified by:

features in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Specified by:

features in interface SimpleFeatureCollection

Returns:

A FeatureIterator.

sort

public SimpleFeatureCollection sort(SortBy order)

Description copied from interface: FeatureCollection

Obtained sorted contents.

This method may not be supported by all implementations, consider the use of FeatureSource.features( Query ).

Specified by:

sort in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Specified by:

sort in interface SimpleFeatureCollection

Parameters:

order - Sort order

Returns:

FeatureCollection sorted in the indicated order

subCollection

public SimpleFeatureCollection subCollection(Filter filter)

Description copied from interface: FeatureCollection

SimpleFeatureCollection "view" indicated by provided filter.

The contents of the returned SimpleFeatureCollection are determined by applying the provider Filter to the entire contents of this FeatureCollection. The result is "live" and modifications will be shared.

This method is used cut down on the number of filter based methods required for a useful SimpleFeatureCollection construct. The FeatureCollections returned really should be considered as a temporary "view" used to control the range of a removeAll, or modify operation.

Example Use:

 collection.subCollection( filter ).clear();
 

The above recommended use is agreement with the Collections API precident of List.subList( start, end ).

The results of subCollection:

• are to be considered unordered
• may be an ordered FeatureList if requested when sortBy is indicated

Specified by:

subCollection in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Specified by:

subCollection in interface SimpleFeatureCollection

Returns:

SimpleFeatureCollection identified as subset.

See Also:

• FeatureList

accepts

public void accepts(FeatureVisitor visitor,
 ProgressListener listener)
             throws IOException

Description copied from interface: FeatureCollection

Visit the contents of a feature collection.

The order of traversal is dependent on the FeatureCollection implementation; some collections are able to make efficient use of an internal index in order to quickly visit features located in the same region.

Specified by:

accepts in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Parameters:

visitor - Closure applied to each feature in turn.

listener - Used to report progress, may be used to interrupt the operation

Throws:

IOException

add

public boolean add(SimpleFeature feature)

addAll

public boolean addAll(Collection<? extends SimpleFeature> collection)

addAll

public boolean addAll(FeatureCollection<? extends SimpleFeatureType,? extends SimpleFeature> collection)

clear

public void clear()

close

public void close(FeatureIterator<SimpleFeature> close)

close

public void close(Iterator<SimpleFeature> close)

contains

public boolean contains(Object obj)

Specified by:

contains in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

See Also:

• Collection.contains(Object)

containsAll

public boolean containsAll(Collection<?> collection)

Specified by:

containsAll in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

See Also:

• Collection.containsAll(Collection)

getBounds

public ReferencedEnvelope getBounds()

Description copied from interface: FeatureCollection

Get the total bounds of this collection which is calculated by doing a union of the bounds of each feature inside of it

Specified by:

getBounds in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Returns:

An Envelope containing the total bounds of this collection.

getID

public String getID()

Description copied from interface: FeatureCollection

ID used when serializing to GML

Specified by:

getID in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

getSchema

public SimpleFeatureType getSchema()

Description copied from interface: FeatureCollection

The schema for the child feature members of this collection.

Represents the most general FeatureType in common to all the features in this collection.

• For a collection backed by a shapefiles (or database tables) the FeatureType returned by getSchema() will complete describe each and every child in the collection.
• For mixed content FeatureCollections you will need to check the FeatureType of each Feature as it is retrived from the collection
• The degenerate case returns the "_Feature" FeatureType, where the only thing known is that the contents are Features.

Specified by:

getSchema in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Returns:

FeatureType describing the "common" schema to all child features of this collection

isEmpty

public boolean isEmpty()

Description copied from interface: FeatureCollection

Returns true if this feature collection contains no features.

Specified by:

isEmpty in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Returns:

true if this collection contains no features

iterator

public Iterator<SimpleFeature> iterator()

purge

public void purge()

remove

public boolean remove(Object o)

removeAll

public boolean removeAll(Collection<?> c)

retainAll

public boolean retainAll(Collection<?> c)

size

public int size()

Will build the STRtree index if required.

Specified by:

size in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

See Also:

• Collection.size()

toArray

public Object[] toArray()

Specified by:

toArray in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

See Also:

• Collection.toArray()

toArray

public <O> O[] toArray(O[] array)

Specified by:

toArray in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

See Also:

• Collection.toArray(Object[])