org.gvsig.fmap.dal.feature

Interface FeatureCache

All Known Subinterfaces:

FeatureCacheProvider

public interface FeatureCache

This class represents a vectorial cache that is used to save and retrieve FeatureSets. First time that a FeatureStore have to retrieve data from a FeatureStoreProvider can save the FeatureSet in the cache with its envelope. Next time that the store has to access to a envelope contained in the previous envelope can retrieve the features directly from the cache and it is not necessary to retrieve data from the provider. The cache supports different scales and creates

Method Summary

Modifier and Type	Method and Description
void	addFeatures(FeatureSet featureSet, FeatureStore featureStore) Add a set of features contained in a envelope for a concrete scale.
void	delete(double scale) Delete all the features for a concrete scale.
void	deleteAll() Delete all the features for all the scales in the cache system.
FeatureSet	getFeatureSet(Envelope envelope, double scale) Return a feature set form a concrete envelope and a scale.

Method Detail

delete

void delete(double scale)
     throws DataException

Delete all the features for a concrete scale.

Parameters:

scale - The scale.

Throws:

DataException

deleteAll

void deleteAll()
        throws DataException

Delete all the features for all the scales in the cache system.

Throws:

DataException

addFeatures

void addFeatures(FeatureSet featureSet,
                 FeatureStore featureStore)
          throws DataException

Add a set of features contained in a envelope for a concrete scale.

Parameters:

featureSet - The feature set retrieved from the server.

Throws:

DataException

getFeatureSet

FeatureSet getFeatureSet(Envelope envelope,
                         double scale)
                  throws DataException

Return a feature set form a concrete envelope and a scale.

Parameters:

envelope - The envelope.

scale - The scale.

Returns:

A feature set contained in the evelope.

Throws:

DataException