org.gvsig.fmap.dal.feature

Interface FeatureIndexes

All Known Implementing Classes:

DefaultFeatureIndexes

public interface FeatureIndexes

This interface gives access to a store's local indexes and also provides a delegated method for obtaining a resulting FeatureSet using the appropriate index given an Evaluator.

Method Summary

Modifier and Type	Method and Description
boolean	areValid() Returns if all the indexes are valid and might be used to get Features.
FeatureIndex	getFeatureIndex(java.lang.String name) Returns a FeatureIndex given the name with which it was created.
FeatureSet	getFeatureSet(Evaluator evaluator) Using the given evaluator attributes, choose and use an appropriate index to obtain a FeatureSet.
java.util.Iterator	iterator() Returns an iterator over the indexes.

Method Detail

getFeatureIndex

FeatureIndex getFeatureIndex(java.lang.String name)

Returns a FeatureIndex given the name with which it was created.

Parameters:

name - FeatureIndex name

Returns:

FeatureIndex or null if it is not found.

getFeatureSet

FeatureSet getFeatureSet(Evaluator evaluator)
                  throws FeatureIndexException

Using the given evaluator attributes, choose and use an appropriate index to obtain a FeatureSet. If no index can be applied, then this method returns null

Parameters:

evaluator -

Returns:

FeatureSet or null if could not find any appropriate index.

Throws:

FeatureIndexException

iterator

java.util.Iterator iterator()

Returns an iterator over the indexes. Elements are of type FeatureIndex.

Returns:

Iterator over the FeatureIndex(es).

areValid

boolean areValid()

Returns if all the indexes are valid and might be used to get Features.

Returns:

if the indexes are valid