QueryIterDefaulting (Apache Jena ARQ)

java.lang.Object
- org.apache.jena.sparql.util.PrintSerializableBase
- - org.apache.jena.sparql.engine.iterator.QueryIteratorBase
  - - org.apache.jena.sparql.engine.iterator.QueryIter
    - - org.apache.jena.sparql.engine.iterator.QueryIterSub
      - org.apache.jena.sparql.engine.iterator.QueryIterDefaulting

All Implemented Interfaces:

java.util.Iterator<Binding>, org.apache.jena.atlas.io.Printable, org.apache.jena.atlas.lib.Closeable, QueryIterator, PrintSerializable
```
public class QueryIterDefaulting
extends QueryIterSub
```
An iterator that returns at least one element from another iterator or a default value (once) if the wrapped iterator returns nothing.

- Field Summary
  - Fields inherited from class org.apache.jena.sparql.engine.iterator.QueryIteratorBase
    traceIterators
- Constructor Summary
  
  Constructors
  Constructor Description
  
  QueryIterDefaulting(QueryIterator cIter, Binding _defaultObject, ExecutionContext qCxt)
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  boolean wasDefaultObject()
  Returns true if the returned binding was the default object.
  - Methods inherited from class org.apache.jena.sparql.engine.iterator.QueryIter
    close, getExecContext, getIteratorNumber, makeTracked, map, materialize, materialize, output, output
  - Methods inherited from class org.apache.jena.sparql.engine.iterator.QueryIteratorBase
    cancel, debug, hasNext, next, nextBinding, remove
  - Methods inherited from class org.apache.jena.sparql.util.PrintSerializableBase
    toString, toString
  - Methods inherited from class java.lang.Object
    equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
  - Methods inherited from interface java.util.Iterator
    forEachRemaining
  - Methods inherited from interface org.apache.jena.sparql.util.PrintSerializable
    toString
  - Methods inherited from interface org.apache.jena.sparql.engine.QueryIterator
    isJoinIdentity

Constructor Detail

QueryIterDefaulting

public QueryIterDefaulting(QueryIterator cIter,
                           Binding _defaultObject,
                           ExecutionContext qCxt)

Method Detail
- wasDefaultObject
```
public boolean wasDefaultObject()
```
  Returns true if the returned binding was the default object. Undef if before the iterator's first .hasNext()