Module org.apache.jena.arq

Package org.apache.jena.sparql.algebra.op

Class OpExt

java.lang.Object

org.apache.jena.sparql.util.PrintSerializableBase

org.apache.jena.sparql.algebra.op.OpBase

org.apache.jena.sparql.algebra.op.OpExt

All Implemented Interfaces:

org.apache.jena.atlas.io.Printable, Op, Named, PrintSerializable

public abstract class OpExt
extends OpBase

Marker for extension points Execution will be per-engine specific

Constructor Summary

Constructors

Constructor	Description
OpExt(String name)

Method Summary

Modifier and Type	Method	Description
Op	apply(Transform transform)
Op	apply(Transform transform, OpVisitor before, OpVisitor after)
abstract Op	effectiveOp()	Return an op that will used by query processing algorithms such as optimization.
abstract QueryIterator	eval(QueryIterator input, ExecutionContext execCxt)	Evaluate the op, given a stream of bindings as input Throw UnsupportedOperationException if this OpExt is not executeable.
final String	getName()
void	output(org.apache.jena.atlas.io.IndentedWriter out, SerializationContext sCxt)
abstract void	outputArgs(org.apache.jena.atlas.io.IndentedWriter out, SerializationContext sCxt)	Output the arguments in legal SSE format.
final void	visit(OpVisitor opVisitor)

Methods inherited from class org.apache.jena.sparql.algebra.op.OpBase

equals, equalTo, hashCode, output

Methods inherited from class org.apache.jena.sparql.util.PrintSerializableBase

toString, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.jena.sparql.util.PrintSerializable

toString

Constructor Details

OpExt

public OpExt(String name)

Method Details

effectiveOp

public abstract Op effectiveOp()

Return an op that will used by query processing algorithms such as optimization. This method returns a non-extension Op expression that is the equivalent SPARQL expression. For example, this is the Op replaced by this extension node.

eval

public abstract QueryIterator eval(QueryIterator input,
 ExecutionContext execCxt)

Evaluate the op, given a stream of bindings as input Throw UnsupportedOperationException if this OpExt is not executeable.

getName

public final String getName()

visit

public final void visit(OpVisitor opVisitor)

output

public void output(org.apache.jena.atlas.io.IndentedWriter out,
 SerializationContext sCxt)

Specified by:

output in interface PrintSerializable

Overrides:

output in class OpBase

apply

public Op apply(Transform transform,
 OpVisitor before,
 OpVisitor after)

apply

public Op apply(Transform transform)

outputArgs

public abstract void outputArgs(org.apache.jena.atlas.io.IndentedWriter out,
 SerializationContext sCxt)

Output the arguments in legal SSE format. Multiple items, whitespace separated