com.bigdata.rdf.sail.sparql

Class ASTDeferredIVResolutionInitializer

java.lang.Object

com.bigdata.rdf.sail.sparql.ASTVisitorBase

com.bigdata.rdf.sail.sparql.ASTDeferredIVResolutionInitializer

All Implemented Interfaces:

SyntaxTreeBuilderVisitor

public class ASTDeferredIVResolutionInitializer
extends ASTVisitorBase

Visits the AST model and builds a map from each RDF Value to BigdataValue objects that have mock IVs assigned to them.

Note: The PrefixDeclProcessor will rewrite ASTQName nodes as ASTIRI nodes. It MUST run before this processor.

Note: Any ASTRDFLiteral or ASTIRI nodes are annotated by this processor using ASTRDFValue.setRDFValue(Value). This includes IRIrefs in the ASTDatasetClause, which are matched as either ASTIRI or ASTQName.

Note: This is a part of deferred IV batch resolution, which is intended to replace the functionality of the BigdataValueReplacer.

Note: IValueExpression nodes used in SPARQLConstraints are allowed to use values not actually in the database. MP

Author:

Bryan Thompson

See Also:

(decouple SPARQL parser from DB), (Refactor test suite to remove tight coupling with IVs while checking up parsed queries)

Constructor Summary

Constructors

Constructor and Description
ASTDeferredIVResolutionInitializer()

Method Summary

Methods

Modifier and Type	Method and Description
static IV	decode(String val, String type) Decode an IV from its string representation and type, provided in as ASTRDFLiteral node in AST model.
Map<org.openrdf.model.Value,BigdataValue>	getValues() Return a map from openrdf Value objects to the corresponding BigdataValue objects for all Values that appear in the parse tree.
void	process(ASTOperationContainer qc) Visit the parse tree, locating and collecting references to all ASTRDFValue nodes (including blank nodes iff we are in a told bnodes mode).

Methods inherited from class com.bigdata.rdf.sail.sparql.ASTVisitorBase

visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

ASTDeferredIVResolutionInitializer

public ASTDeferredIVResolutionInitializer()

Method Detail

getValues

public Map<org.openrdf.model.Value,BigdataValue> getValues()

Return a map from openrdf Value objects to the corresponding BigdataValue objects for all Values that appear in the parse tree.

process

public void process(ASTOperationContainer qc)
             throws org.openrdf.query.MalformedQueryException

Visit the parse tree, locating and collecting references to all ASTRDFValue nodes (including blank nodes iff we are in a told bnodes mode). The ASTRDFValues are collected in a Map which associates each one with a BigdataValue object which is set using ASTRDFValue.setRDFValue(org.openrdf.model.Value). The BigdataValues will be resolved later (in ASTDeferredIVResolution) in a batch against the database, obtaining their IVs. Until then BigdataValues in the parse tree have unresolved IVs (TermID(0)).

Parameters:

qc -

Throws:

org.openrdf.query.MalformedQueryException

decode

public static IV decode(String val,
        String type)

Decode an IV from its string representation and type, provided in as ASTRDFLiteral node in AST model.

Note: This is a very special case method. Normally logic should go through the ILexiconRelation to resolve inline IVs. This always uses inline IVs, and thus defeats the ILexiconConfiguration for the namespace.

Parameters:

val - the string representation

type - value type

Returns:

the IV

See Also:

(SPARQL QUERY/UPDATE should not use db connection) This method was moved from IVUtility class, as it is not used anywhere except AST Deferred resolution