ValueIteratorSource (Teiid 15.0.0 API)

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

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Set<Object>`	`getCachedSet(Expression valueExpression)`
`ValueIterator`	`getValueIterator(Expression valueExpression)`	Attempt to obtain a ValueIterator from this source.
`boolean`	`isUnused()`
`void`	`setUnused(boolean unused)`

- Method Detail
  - getValueIterator
```
ValueIterator getValueIterator(Expression valueExpression)
                        throws TeiidComponentException
```
    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:
    
    TeiidComponentException
    
    Since:
    
    5.0.1
  - getCachedSet
```
Set<Object> getCachedSet(Expression valueExpression)
                  throws TeiidComponentException,
                         TeiidProcessingException
```
    Throws:
    
    TeiidComponentException
    
    TeiidProcessingException
  - setUnused
```
void setUnused(boolean unused)
```
  - isUnused
```
boolean isUnused()
```