org.geotools.feature.collection

Class SubFeatureCollection

Object

BaseFeatureCollection<SimpleFeatureType,SimpleFeature>

BaseSimpleFeatureCollection

SubFeatureCollection

All Implemented Interfaces:

SimpleFeatureCollection, FeatureCollection<SimpleFeatureType,SimpleFeature>

Direct Known Subclasses:

SubFeatureList

public class SubFeatureCollection
extends BaseSimpleFeatureCollection

Reasonable default implementation for subCollection making use of parent SimpleFeatureCollection.features() and provided Filter.

This is only a reasonable implementation and is not optimal. It is recommended that implementors construct a new Query and use SimpleFeatureSource.getFeatures(Query).

Author:

Jody Garnett, Refractions Research, Inc.

Field Summary

Fields

Modifier and Type	Field and Description
protected SimpleFeatureCollection	collection Original Collection
protected FilterFactory	ff
protected Filter	filter Filter

Fields inherited from class BaseFeatureCollection

id, schema

Constructor Summary

Constructors

Constructor and Description
SubFeatureCollection(SimpleFeatureCollection collection)
SubFeatureCollection(SimpleFeatureCollection collection, Filter subfilter)

Method Summary

Modifier and Type	Method and Description
protected Filter	createFilter() Override to implement subsetting
SimpleFeatureIterator	features() Subclasses required to implement this method to traverse FeatureCollection contents.
protected Filter	filter() Generate filter to use for content, makes use of createFilter() if needed.
ReferencedEnvelope	getBounds() Calculates the bounds of the features without caching.
String	getID() ID used when serializing to GML
int	size() Returns the number of elements in this collection.
SimpleFeatureCollection	sort(SortBy order) Obtained sorted contents, only implemented for SimpleFeature at present.
SimpleFeatureCollection	subCollection(Filter filter) Convenience implementation that just wraps this collection into a FilteringFeatureCollection.

Methods inherited from class BaseFeatureCollection

accepts, contains, containsAll, getSchema, isEmpty, toArray, toArray

Methods inherited from class Object

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

Methods inherited from interface FeatureCollection

accepts, contains, containsAll, getSchema, isEmpty, toArray, toArray

Field Detail

filter

protected Filter filter

Filter

collection

protected SimpleFeatureCollection collection

Original Collection

ff

protected FilterFactory ff

Constructor Detail

SubFeatureCollection

public SubFeatureCollection(SimpleFeatureCollection collection)

SubFeatureCollection

public SubFeatureCollection(SimpleFeatureCollection collection,
                            Filter subfilter)

Parameters:

collection - Collection or AbstractFeatureCollection

subfilter -

Method Detail

features

public SimpleFeatureIterator features()

Description copied from class: BaseSimpleFeatureCollection

Subclasses required to implement this method to traverse FeatureCollection contents.

Note that FeatureIterator.close() is available to clean up after any resource use required during traversal.

Specified by:

features in interface SimpleFeatureCollection

Specified by:

features in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Specified by:

features in class BaseSimpleFeatureCollection

Returns:

A FeatureIterator.

size

public int size()

Description copied from class: BaseFeatureCollection

Returns the number of elements in this collection.

Specified by:

size in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Overrides:

size in class BaseFeatureCollection<SimpleFeatureType,SimpleFeature>

Returns:

Number of items, or Interger.MAX_VALUE

See Also:

Collection.size()

filter

protected Filter filter()

Generate filter to use for content, makes use of createFilter() if needed.

Returns:

Filter to use for content

createFilter

protected Filter createFilter()

Override to implement subsetting

subCollection

public SimpleFeatureCollection subCollection(Filter filter)

Description copied from class: BaseFeatureCollection

Convenience implementation that just wraps this collection into a FilteringFeatureCollection. Subclasses might want to override this in case the filter can be cascaded to their data sources.

Specified by:

subCollection in interface SimpleFeatureCollection

Specified by:

subCollection in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Overrides:

subCollection in class BaseSimpleFeatureCollection

Returns:

SimpleFeatureCollection identified as subset.

See Also:

FeatureList

sort

public SimpleFeatureCollection sort(SortBy order)

Description copied from class: BaseFeatureCollection

Obtained sorted contents, only implemented for SimpleFeature at present.

This method only supports SimpleFeature at present, consider use of FeatureSource.features( Query ).

Specified by:

sort in interface SimpleFeatureCollection

Specified by:

sort in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Overrides:

sort in class BaseSimpleFeatureCollection

Parameters:

order - Sort order

Returns:

FeatureCollection sorted in the indicated order

getID

public String getID()

Description copied from interface: FeatureCollection

ID used when serializing to GML

Specified by:

getID in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Overrides:

getID in class BaseFeatureCollection<SimpleFeatureType,SimpleFeature>

getBounds

public ReferencedEnvelope getBounds()

Calculates the bounds of the features without caching.

Specified by:

getBounds in interface FeatureCollection<SimpleFeatureType,SimpleFeature>

Overrides:

getBounds in class BaseFeatureCollection<SimpleFeatureType,SimpleFeature>

Returns:

An Envelope containing the total bounds of this collection.