com.bigdata.rdf.sparql.ast.eval

Interface IEvaluationContext

All Known Implementing Classes:

AST2BOpContext, AST2BOpUpdateContext

public interface IEvaluationContext

Interface providing access to various things of interest when preparing and evaluating a query or update operation.

Version:

$Id$

Author:

Bryan Thompson

Method Summary

Methods

Modifier and Type	Method and Description
AbstractTripleStore	getAbstractTripleStore() Return the database.
BOpContextBase	getBOpContext() Return the context for evaluation of IValueExpressions during query optimization.
IDescribeCache	getDescribeCache() Return the cache for described resources (experimental feature).
Set<IVariable<?>>	getGloballyScopedVariables() Returns all the variables with a global scope.
String	getLexiconNamespace() Return the namespace of the LexiconRelation.
long	getLexiconReadTimestamp() Return the timestamp which will be used to read on the lexicon.
String	getNamespace() Return the namespace of the AbstractTripleStore.
ISolutionSetManager	getSolutionSetManager() Return the manager for named solution sets (experimental feature).
ISolutionSetStats	getSolutionSetStats() Some summary statistics about the exogenous solution sets.
ISolutionSetStats	getSolutionSetStats(String name) Resolve the pre-existing named solution set returning its ISolutionSetStats.
String	getSPONamespace() Return the namespace of the SPORelation.
StaticAnalysisStats	getStaticAnalysisStats() Summary statistics for the static analysis phase.
long	getTimestamp() The timestamp or transaction identifier associated with the view.
boolean	isCluster() Return true if we are running on a cluster.
boolean	isQuads() Return true iff the target AbstractTripleStore is in quads mode.
boolean	isSIDs() Return true iff the target AbstractTripleStore is in SIDS mode.
boolean	isTriples() Return true iff the target AbstractTripleStore is in triples mode.
void	setGloballyScopedVariables(Set<IVariable<?>> globallyScopedVariables) Sets the variables with global scope.

Method Detail

getSolutionSetStats

ISolutionSetStats getSolutionSetStats()

Some summary statistics about the exogenous solution sets. These are computed by AST2BOpUtility.convert(AST2BOpContext, IBindingSet[]) before it begins to run the IASTOptimizers.

getStaticAnalysisStats

StaticAnalysisStats getStaticAnalysisStats()

Summary statistics for the static analysis phase.

getTimestamp

long getTimestamp()

The timestamp or transaction identifier associated with the view.

isCluster

boolean isCluster()

Return true if we are running on a cluster.

isQuads

boolean isQuads()

Return true iff the target AbstractTripleStore is in quads mode.

isSIDs

boolean isSIDs()

Return true iff the target AbstractTripleStore is in SIDS mode.

isTriples

boolean isTriples()

Return true iff the target AbstractTripleStore is in triples mode.

getNamespace

String getNamespace()

Return the namespace of the AbstractTripleStore.

getSPONamespace

String getSPONamespace()

Return the namespace of the SPORelation.

getLexiconNamespace

String getLexiconNamespace()

Return the namespace of the LexiconRelation.

getBOpContext

BOpContextBase getBOpContext()

Return the context for evaluation of IValueExpressions during query optimization.

Returns:

The context that can be used to resolve the ILexiconConfiguration and LexiconRelation for evaluation if IValueExpressions during query optimization. (During query evaluation this information is passed into the pipeline operators by the ContextBindingSet.)

See Also:

BLZG-1372

getLexiconReadTimestamp

long getLexiconReadTimestamp()

Return the timestamp which will be used to read on the lexicon.

Note: This uses the timestamp of the triple store view unless this is a read/write transaction, in which case we need to use the last commit point in order to see any writes which it may have performed (lexicon writes are always unisolated).

getAbstractTripleStore

AbstractTripleStore getAbstractTripleStore()

Return the database.

getSolutionSetManager

ISolutionSetManager getSolutionSetManager()

Return the manager for named solution sets (experimental feature).

Returns:

The manager -or- null.

getDescribeCache

IDescribeCache getDescribeCache()

Return the cache for described resources (experimental feature).

Returns:

The cache -or- null.

See Also:

QueryHints.DESCRIBE_CACHE

getSolutionSetStats

ISolutionSetStats getSolutionSetStats(String name)

Resolve the pre-existing named solution set returning its ISolutionSetStats.

Parameters:

localName - The local name of the named solution set.

Returns:

The ISolutionSetStats

Throws:

RuntimeException - if the named solution set can not be found.

getGloballyScopedVariables

Set<IVariable<?>> getGloballyScopedVariables()

Returns all the variables with a global scope. This basically serves the purpose of identifying variables that are injected through Sesame's Operation.setBinding() interface. Guaranteed to be not null.

Returns:

setGloballyScopedVariables

void setGloballyScopedVariables(Set<IVariable<?>> globallyScopedVariables)

Sets the variables with global scope. This basically serves the purpose of identifying

Parameters:

globallyScopedVariables -