Package org.apache.jena.sparql.engine.iterator

Class QueryIterAssignVarValue

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.QueryIter1

org.apache.jena.sparql.engine.iterator.QueryIterProcessBinding

org.apache.jena.sparql.engine.iterator.QueryIterAssignVarValue

All Implemented Interfaces:

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

public class QueryIterAssignVarValue
extends QueryIterProcessBinding

Extend each solution by a (var, node) When used with mustBeNewVar=false, this is a join. If the input already has the variable assigned, then it must be the same (.equals) node and if it is not, the input row is rejected.

See Also:

QueryIterAssign, QueryIterExtendByVar

Field Summary

Fields inherited from class org.apache.jena.sparql.engine.iterator.QueryIteratorBase

traceIterators

Constructor Summary

Constructors

Constructor	Description
QueryIterAssignVarValue(QueryIterator input, Var var, Node node, ExecutionContext qCxt)
QueryIterAssignVarValue(QueryIterator input, Var var, Node node, ExecutionContext qCxt, boolean mustBeNewVar)

Method Summary

Modifier and Type	Method	Description
Binding	accept(Binding binding)	Process the binding - return null for "not accept".

Methods inherited from class org.apache.jena.sparql.engine.iterator.QueryIterProcessBinding

moveToNextBinding

Methods inherited from class org.apache.jena.sparql.engine.iterator.QueryIter1

output

Methods inherited from class org.apache.jena.sparql.engine.iterator.QueryIter

close, getExecContext, getIteratorNumber, makeTracked, map, materialize, materialize, 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

QueryIterAssignVarValue

public QueryIterAssignVarValue(QueryIterator input,
                               Var var,
                               Node node,
                               ExecutionContext qCxt)

QueryIterAssignVarValue

public QueryIterAssignVarValue(QueryIterator input,
                               Var var,
                               Node node,
                               ExecutionContext qCxt,
                               boolean mustBeNewVar)

Method Detail

accept

public Binding accept(Binding binding)

Description copied from class: QueryIterProcessBinding

Process the binding - return null for "not accept". Subclasses may return a different Binding to the argument and the result is the returned Binding.

Specified by:

accept in class QueryIterProcessBinding