org.geotools.data.complex

Class MappingFeatureCollection

Object

MappingFeatureCollection

All Implemented Interfaces:

FeatureCollection<FeatureType,Feature>

public class MappingFeatureCollection
extends Object
implements FeatureCollection<FeatureType,Feature>

FeatureCollection for a MappingFeatureIterator.

Since:

2.6

Author:

Ben Caradoc-Davies (CSIRO Earth Science and Resource Engineering)

Constructor Summary

Constructors

Constructor and Description
MappingFeatureCollection(AppSchemaDataAccess store, FeatureTypeMapping mapping, Query query)

Method Summary

Modifier and Type	Method and Description
void	accepts(FeatureVisitor visitor, ProgressListener progress) Visit the contents of a feature collection.
boolean	add(Feature obj) Not a supported operation.
boolean	addAll(Collection<? extends Feature> collection)
boolean	addAll(FeatureCollection<? extends FeatureType,? extends Feature> resource)
void	addListener(CollectionListener listener)
void	clear()
void	close(FeatureIterator<Feature> close)
void	close(Iterator<Feature> close)
boolean	contains(Object o)
boolean	containsAll(Collection<?> o)
FeatureIterator<Feature>	features() Obtain a FeatureIterator of the Features within this FeatureCollection.
XmlMappingFeatureIterator	features(String xpath, String value)
FeatureIterator<Feature>	features(Transaction transaction) This overload allows client code to explicitly specify the transaction that the created iterator will be working against.
ReferencedEnvelope	getBounds() Stolen from ReprojectFeatureResults.
String	getID() ID used when serializing to GML
Query	getQuery()
FeatureType	getSchema() The schema for the child feature members of this collection.
boolean	isEmpty() Returns true if this feature collection contains no features.
boolean	isXmlCollection()
Iterator<Feature>	iterator()
void	purge()
boolean	remove(Object o)
boolean	removeAll(Collection<?> c)
void	removeListener(CollectionListener listener)
boolean	retainAll(Collection<?> c)
void	setUnrolledFilter(Filter unrolledFilter)
int	size() Please note this operation may be expensive when working with remote content.
FeatureCollection<FeatureType,Feature>	sort(SortBy order) Obtained sorted contents.
FeatureCollection<FeatureType,Feature>	subCollection(Filter filter) SimpleFeatureCollection "view" indicated by provided filter.
Object[]	toArray()
<O> O[]	toArray(O[] a)

Methods inherited from class Object

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

Constructor Detail

MappingFeatureCollection

public MappingFeatureCollection(AppSchemaDataAccess store,
                                FeatureTypeMapping mapping,
                                Query query)

Method Detail

setUnrolledFilter

public void setUnrolledFilter(Filter unrolledFilter)

accepts

public void accepts(FeatureVisitor visitor,
                    ProgressListener progress)
             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<FeatureType,Feature>

Parameters:

visitor - Closure applied to each feature in turn.

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

Throws:

IOException

See Also:

FeatureCollection.accepts(org.opengis.feature.FeatureVisitor, org.opengis.util.ProgressListener)

add

public boolean add(Feature obj)

Not a supported operation.

See Also:

org.geotools.feature.FeatureCollection#add(org.opengis.feature.Feature)

addAll

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

addAll

public boolean addAll(FeatureCollection<? extends FeatureType,? extends Feature> resource)

addListener

public void addListener(CollectionListener listener)
                 throws NullPointerException

Throws:

NullPointerException

clear

public void clear()

close

public void close(FeatureIterator<Feature> close)

close

public void close(Iterator<Feature> close)

contains

public boolean contains(Object o)

Specified by:

contains in interface FeatureCollection<FeatureType,Feature>

See Also:

Collection.contains(Object)

containsAll

public boolean containsAll(Collection<?> o)

Specified by:

containsAll in interface FeatureCollection<FeatureType,Feature>

See Also:

Collection.containsAll(Collection)

features

public FeatureIterator<Feature> features()

Description copied from interface: FeatureCollection

Obtain a FeatureIterator of the Features within this FeatureCollection.

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

Example use:

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

GML Note: The contents of this iterator are considered to be defined by featureMember tags (and/or the single allowed FeatureMembers tag). Please see getFeatureType for more details.

Specified by:

features in interface FeatureCollection<FeatureType,Feature>

Returns:

A FeatureIterator.

features

public FeatureIterator<Feature> features(Transaction transaction)

This overload allows client code to explicitly specify the transaction that the created iterator will be working against.

Passing null is equivalent to calling features() and lets the iterator decide whether a new transaction should be created (and closed when the iterator is closed) or not. Currently, a new transaction is created by DataAccessMappingFeatureIterator only if a database backend is available and joining is enabled, to reduce the number of concurrent connections opened due to feature chaining.

Parameters:

transaction - the transaction the created iterator will be working against

See Also:

FeatureCollection.features()

features

public XmlMappingFeatureIterator features(String xpath,
                                          String value)
                                   throws IOException

Throws:

IOException

getBounds

public ReferencedEnvelope getBounds()

Stolen from ReprojectFeatureResults.

Specified by:

getBounds in interface FeatureCollection<FeatureType,Feature>

Returns:

An Envelope containing the total bounds of this collection.

See Also:

FeatureCollection.getBounds()

getID

public String getID()

Description copied from interface: FeatureCollection

ID used when serializing to GML

Specified by:

getID in interface FeatureCollection<FeatureType,Feature>

getSchema

public FeatureType 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<FeatureType,Feature>

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<FeatureType,Feature>

Returns:

true if this collection contains no features

iterator

public Iterator<Feature> iterator()

purge

public void purge()

remove

public boolean remove(Object o)

removeAll

public boolean removeAll(Collection<?> c)

removeListener

public void removeListener(CollectionListener listener)
                    throws NullPointerException

Throws:

NullPointerException

retainAll

public boolean retainAll(Collection<?> c)

size

public int size()

Description copied from interface: FeatureCollection

Please note this operation may be expensive when working with remote content.

Specified by:

size in interface FeatureCollection<FeatureType,Feature>

See Also:

Collection.size()

sort

public FeatureCollection<FeatureType,Feature> 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<FeatureType,Feature>

Parameters:

order - Sort order

Returns:

FeatureCollection sorted in the indicated order

isXmlCollection

public boolean isXmlCollection()

subCollection

public FeatureCollection<FeatureType,Feature> 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<FeatureType,Feature>

Returns:

SimpleFeatureCollection identified as subset.

See Also:

FeatureList

toArray

public Object[] toArray()

Specified by:

toArray in interface FeatureCollection<FeatureType,Feature>

See Also:

Collection.toArray()

toArray

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

Specified by:

toArray in interface FeatureCollection<FeatureType,Feature>

See Also:

Collection.toArray(Object[])

getQuery

public Query getQuery()