com.metamatrix.query.processor.relational
Class DependentValueSource

java.lang.Object
  com.metamatrix.query.processor.relational.DependentValueSource

All Implemented Interfaces:

ValueIteratorSource

public class DependentValueSource
extends java.lang.Object
implements ValueIteratorSource

Constructor Summary

DependentValueSource(TupleSourceID tupleSourceID, BufferManager bm)

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

DependentValueSource

public DependentValueSource(TupleSourceID tupleSourceID,
                            BufferManager bm)

Method Detail

getTupleSourceID

public TupleSourceID getTupleSourceID()

getValueIterator

public ValueIterator getValueIterator(Expression valueExpression)
                               throws MetaMatrixComponentException

Description copied from interface: ValueIteratorSource

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

Specified by:

getValueIterator in interface ValueIteratorSource

Parameters:

valueExpression - The expression we are retrieving an iterator for

Returns:

ValueIterator if ready, null otherwise

Throws:

MetaMatrixComponentException

TupleSourceNotFoundException

See Also:

ValueIteratorSource.getValueIterator(com.metamatrix.query.sql.symbol.Expression)

getCachedSet

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

Specified by:

getCachedSet in interface ValueIteratorSource

Throws:

MetaMatrixComponentException

MetaMatrixProcessingException