QueryIteratorBase (Apache Jena ARQ)

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

All Implemented Interfaces:

java.util.Iterator<Binding>, org.apache.jena.atlas.io.Printable, org.apache.jena.atlas.lib.Closeable, QueryIterator, PrintSerializable

Direct Known Subclasses:

CSVInputIterator, JSONInputIterator, QueryIter, QueryIteratorResultSet, QueryIteratorWrapper
```
public abstract class QueryIteratorBase
extends PrintSerializableBase
implements QueryIterator
```
This class provides the general machinery for iterators. This includes:
- autoclose when the iterator runs out
- ensuring query iterators only contain Bindings

Field Summary

Fields
Modifier and Type Field Description

static boolean traceIterators

Constructor Summary

Constructors
Constructor Description

QueryIteratorBase()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`cancel()`	Cancel this iterator
`void`	`close()`
`java.lang.String`	`debug()`
`boolean`	`hasNext()`	final - subclasses implement hasNextBinding()
`Binding`	`next()`	final - autoclose and registration relies on it - implement moveToNextBinding()
`Binding`	`nextBinding()`	final - subclasses implement moveToNextBinding()
`void`	`remove()`

Methods inherited from class org.apache.jena.sparql.util.PrintSerializableBase
output, 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.atlas.io.Printable
output

Methods inherited from interface org.apache.jena.sparql.util.PrintSerializable
output, toString

Methods inherited from interface org.apache.jena.sparql.engine.QueryIterator
isJoinIdentity

- Field Detail
  - traceIterators
```
public static boolean traceIterators
```
- Constructor Detail
  - QueryIteratorBase
```
public QueryIteratorBase()
```
- Method Detail
  - hasNext
```
public final boolean hasNext()
```
    final - subclasses implement hasNextBinding()
    
    Specified by:
    
    hasNext in interface java.util.Iterator<Binding>
  - next
```
public final Binding next()
```
    final - autoclose and registration relies on it - implement moveToNextBinding()
    
    Specified by:
    
    next in interface java.util.Iterator<Binding>
  - nextBinding
```
public final Binding nextBinding()
```
    final - subclasses implement moveToNextBinding()
    
    Specified by:
    
    nextBinding in interface QueryIterator
  - remove
```
public final void remove()
```
    Specified by:
    
    remove in interface java.util.Iterator<Binding>
  - close
```
public void close()
```
    Specified by:
    
    close in interface org.apache.jena.atlas.lib.Closeable
  - cancel
```
public final void cancel()
```
    Cancel this iterator
    
    Specified by:
    
    cancel in interface QueryIterator
  - debug
```
public java.lang.String debug()
```