Class ExecOpOrderBy

java.lang.Object

se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.BaseForExecOps

se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.UnaryExecutableOpBase

se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.ExecOpOrderBy

All Implemented Interfaces:

StatsProvider, ExecutableOperator, UnaryExecutableOp

public class ExecOpOrderBy
extends UnaryExecutableOpBase

Sorts solution mappings according to the ordering conditions of an ORDER BY clause. This is a blocking operator that consumes all input solution mappings before producing output.

Field Summary

Fields

Modifier and Type	Field	Description
protected final PriorityQueue<SolutionMapping>	solutionMappings

Fields inherited from class se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.BaseForExecOps

collectExceptions, mayReduce, qpInfo

Constructor Summary

Constructors

Constructor	Description
ExecOpOrderBy(List<org.apache.jena.query.SortCondition> sortConditions, boolean mayReduce, boolean collectExceptions, QueryPlanningInfo qpInfo)

Method Summary

Modifier and Type	Method	Description
protected void	_concludeExecution(IntermediateResultElementSink sink, QueryProcContextExt ctx)	Implementations of this function need to conclude the execution of this operator and send the remaining result elements (if any) to the given sink.
protected void	_process(SolutionMapping inputSolMap, IntermediateResultElementSink sink, QueryProcContextExt ctx)	Implementations of this function need to process the given solution mapping as input and send the produced result elements (if any) to the given sink.
protected ExecutableOperatorStatsImpl	createStats()
void	resetStats()

Methods inherited from class se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.UnaryExecutableOpBase

_process, concludeExecution, getStats, process, process

Methods inherited from class se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.BaseForExecOps

getExceptionsCaughtDuringExecution, getQueryPlanningInfo, mayReduce, recordExceptionCaughtDuringExecution

Methods inherited from class java.lang.Object

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

Methods inherited from interface se.liu.ida.hefquin.engine.queryplan.executable.ExecutableOperator

getExceptionsCaughtDuringExecution, getQueryPlanningInfo, mayReduce

Field Details

solutionMappings

protected final PriorityQueue<SolutionMapping> solutionMappings

Constructor Details

ExecOpOrderBy

public ExecOpOrderBy(List<org.apache.jena.query.SortCondition> sortConditions,
 boolean mayReduce,
 boolean collectExceptions,
 QueryPlanningInfo qpInfo)

Method Details

_process

protected void _process(SolutionMapping inputSolMap,
 IntermediateResultElementSink sink,
 QueryProcContextExt ctx)

Description copied from class: UnaryExecutableOpBase

Implementations of this function need to process the given solution mapping as input and send the produced result elements (if any) to the given sink. If an exception occurs while processing the solution mapping, then this exception needs to be thrown.

Specified by:

_process in class UnaryExecutableOpBase

_concludeExecution

protected void _concludeExecution(IntermediateResultElementSink sink,
 QueryProcContextExt ctx)

Description copied from class: UnaryExecutableOpBase

Implementations of this function need to conclude the execution of this operator and send the remaining result elements (if any) to the given sink. If an exception occurs during this process, then this exception needs to be thrown.

Specified by:

_concludeExecution in class UnaryExecutableOpBase

resetStats

public void resetStats()

Specified by:

resetStats in interface StatsProvider

Overrides:

resetStats in class UnaryExecutableOpBase

createStats

protected ExecutableOperatorStatsImpl createStats()

Overrides:

createStats in class UnaryExecutableOpBase