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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.data

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

java.util .EventObject

org.geotools.data .FeatureEvent

FeatureEvent

public class FeatureEvent extends EventObject (Code)

A simple event object to represent all events triggered by DataStore instances (typically change events).

The "Source" FeatureEvents is taken to be a FeatureSource, rather than DataStore. The is due to FeatureSource having a a hold of Transaction information.

DataStore implementations will actually keep the list listeners by DataSource, and can report FeatureWriter modifications as required (by filtering the Listener list by typeName and Transaction).

The commit opperation will also need to provide notification.

since:
GeoTools 2.0

Field Summary
final public static int	FEATURES_ADDED Event type constant denoting the adding of a feature. This EventType is used when FeatureWriter.write() is called when `FeatureWriter.hasNext()` has previously returned `false`.
final public static int	FEATURES_CHANGED Event type constant denoting that features in the collection has been modified. This EventType is used when a FeatureWriter.write() is called when `FeatureWriter.hasNext()` returns `true` and the current Feature has been changed.
final public static int	FEATURES_REMOVED Event type constant denoting the removal of a feature. This EventType is used when FeatureWriter.remove() is called.

Constructor Summary
public	FeatureEvent(FeatureSource featureSource, int eventType, Envelope bounds) Constructs a new FeatureEvent.

Method Summary
public Envelope	getBounds() Provides access to the area modified (if known).
public int	getEventType() Provides information on the type of change that has occured.
public FeatureSource	getFeatureSource() Provides access to the FeatureSource which fired the event.

Field Detail

FEATURES_ADDED

final public static int FEATURES_ADDED(Code)

Event type constant denoting the adding of a feature.

This EventType is used when FeatureWriter.write() is called when FeatureWriter.hasNext() has previously returned false. This action represents a newly create Feature being passed to the DataStore.

The FeatureWriter making the modification will need to check that typeName it is modifing matches the FeatureSource.getSchema().getTypeName() before sending notification to any listeners on the FeatureSource.

FeatureEvent.getBounds() should reflect the the Bounding Box of the newly created Features.

FEATURES_CHANGED

final public static int FEATURES_CHANGED(Code)

Event type constant denoting that features in the collection has been modified.

This EventType is used when a FeatureWriter.write() is called when FeatureWriter.hasNext() returns true and the current Feature has been changed. This EventType is also used when a Transaction commit() or rolledback is called.

If the FeatureWriter is opperating against a Transaction it will need ensure that to check the FeatureSource.getTransaction() for a match before sending notification to any listeners on the FeatureSource. All FeatureSources of the same typename will need to be informed of a commit, except ones in the same Transaction, and only FeatureSources in the same Transaction will need to be informed of a rollback.

FeatureEvent.getBounds() should reflect the the BoundingBox of the FeatureWriter modified Features. This may not be possible during a commit() or rollback() opperation.

FEATURES_REMOVED

final public static int FEATURES_REMOVED(Code)

Event type constant denoting the removal of a feature.

This EventType is used when FeatureWriter.remove() is called. This action represents a Feature being removed from the DataStore.

FeatureEvent.getBounds() should reflect the the Bounding Box of the removed Features.

Constructor Detail

FeatureEvent
public FeatureEvent(FeatureSource featureSource, int eventType, Envelope bounds)(Code)
	Constructs a new FeatureEvent. Parameters: featureSource - The DataStore that fired the event Parameters: eventType - One of FEATURE_CHANGED, FEATURE_REMOVED orFEATURE_ADDED Parameters: bounds - The area modified by this change

Method Detail

getBounds
public Envelope getBounds()(Code)
	Provides access to the area modified (if known). A bounding box of the modifications or `null` ifunknown.

getEventType
public int getEventType()(Code)
	Provides information on the type of change that has occured. Possible types are: add, remove, change an int which must be one of FEATURES_ADDED, FEATURES_REMOVED,FEATURES_CHANGED

getFeatureSource
public FeatureSource getFeatureSource()(Code)
	Provides access to the FeatureSource which fired the event. The FeatureSource which was the event's source.

Fields inherited from java.util.EventObject

protected transient Object source(Code)(Java Doc)

Methods inherited from java.util.EventObject

public Object getSource()(Code)(Java Doc)
public String toString()(Code)(Java Doc)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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