com.metamatrix.query.sql.util
Interface ValueIteratorSource

All Known Implementing Classes:

DependentValueSource

public interface ValueIteratorSource

The ValueIteratorSource lets a language object that needs a ValueIterator hold this reference to the source of the ValueIterator as a reference until the ValueIterator can be ready.

Since:

5.0.1

Method Summary

java.util.HashSet<java.lang.Object>	getCachedSet(Expression valueExpression)
ValueIterator	getValueIterator(Expression valueExpression) Attempt to obtain a ValueIterator from this source.

Method Detail

getValueIterator

ValueIterator getValueIterator(Expression valueExpression)
                               throws MetaMatrixComponentException

Attempt to obtain a ValueIterator from this source. If the iterator is not ready yet, return null to indicate that.

Parameters:

valueExpression - The expression we are retrieving an iterator for

Returns:

ValueIterator if ready, null otherwise

Throws:

MetaMatrixComponentException

TupleSourceNotFoundException

Since:

5.0.1

getCachedSet

java.util.HashSet<java.lang.Object> getCachedSet(Expression valueExpression)
                                                 throws MetaMatrixComponentException,
                                                        MetaMatrixProcessingException

Throws:

MetaMatrixComponentException

MetaMatrixProcessingException