Module org.apache.jena.arq

Package org.apache.jena.sparql.engine.main

Class OpExecutor

java.lang.Object

org.apache.jena.sparql.engine.main.OpExecutor

Direct Known Subclasses:

OpExecutorQuads

public class OpExecutor
extends Object

Turn an Op expression into an execution of QueryIterators. Does not consider optimizing the algebra expression (that should happen elsewhere). BGPs are still subject to StageBuilding during iterator execution. During execution, when a substitution into an algebra expression happens (in other words, a streaming operation, index-join-like), there is a call into the executor each time so it does not just happen once before a query starts.

Field Summary

Fields

Modifier and Type	Field	Description
static final OpExecutorFactory	stdFactory

Method Summary

Modifier and Type	Method	Description
static QueryIterator	createRootQueryIterator(ExecutionContext execCxt)
QueryIterator	executeOp(Op op, QueryIterator input)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

stdFactory

public static final OpExecutorFactory stdFactory

Method Details

executeOp

public QueryIterator executeOp(Op op,
 QueryIterator input)

createRootQueryIterator

public static QueryIterator createRootQueryIterator(ExecutionContext execCxt)