Module org.apache.jena.arq

Package org.apache.jena.sparql.syntax.syntaxtransform

Class QueryTransformOps

java.lang.Object

org.apache.jena.sparql.syntax.syntaxtransform.QueryTransformOps

public class QueryTransformOps
extends Object

Support for transformation of query abstract syntax.

Constructor Summary

Constructors

Constructor	Description
QueryTransformOps()

Method Summary

Modifier and Type	Method	Description
static Query	queryReplaceVars(Query query, Map<String,? extends org.apache.jena.rdf.model.RDFNode> substitutions)	Transform a query based on a mapping from variable name to replacement RDFNode (a Resource (or blank node) or a Literal).
static Query	replaceVars(Query query, Map<Var,? extends org.apache.jena.graph.Node> substitutions)	Transform a query based on a mapping from Var variable to replacement Node.
static Query	shallowCopy(Query query)	Return a new query object with copies of prefixes, base and dataset description and shares patterns and results clause (SELECT query) with the original.
static Query	syntaxSubstitute(Query input, Map<Var,? extends org.apache.jena.graph.Node> substitutions)	Replace variables in a query by RDF terms.
static Query	transform(Query query, NodeTransform transform)	Transform a query using a generic NodeTransform.
static Query	transform(Query query, ElementTransform transform)
static Query	transform(Query query, ElementTransform transform, ExprTransform exprTransform)	Transform a query using ElementTransform and ExprTransform.

Methods inherited from class java.lang.Object

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

Constructor Details

QueryTransformOps

public QueryTransformOps()

Method Details

syntaxSubstitute

public static Query syntaxSubstitute(Query input,
 Map<Var,? extends org.apache.jena.graph.Node> substitutions)

Replace variables in a query by RDF terms. The replacements are added to the return queries SELECT clause if the query is a SELECT query.

Throws:

QueryScopeException - if the query contains variables used in a way that does not allow substitution (.e.g AS ?var or used in VALUES).

See Also:

• to replace variables without adding the replacements to the SELECT clause.

replaceVars

public static Query replaceVars(Query query,
 Map<Var,? extends org.apache.jena.graph.Node> substitutions)

Transform a query based on a mapping from Var variable to replacement Node. The replacement can be a constant or another variable.

To change the query to record the substitutions made, use syntaxSubstitute(Query,Map).

Throws:

QueryScopeException - if the query contains variables used in a way that does not allow constant substitution.

queryReplaceVars

public static Query queryReplaceVars(Query query,
 Map<String,? extends org.apache.jena.rdf.model.RDFNode> substitutions)

Transform a query based on a mapping from variable name to replacement RDFNode (a Resource (or blank node) or a Literal).

transform

public static Query transform(Query query,
 NodeTransform transform)

Transform a query using a generic NodeTransform.

transform

public static Query transform(Query query,
 ElementTransform transform)

transform

public static Query transform(Query query,
 ElementTransform transform,
 ExprTransform exprTransform)

Transform a query using ElementTransform and ExprTransform. It is the responsibility of these transforms to transform to a legal SPARQL query.

shallowCopy

public static Query shallowCopy(Query query)

Return a new query object with copies of prefixes, base and dataset description and shares patterns and results clause (SELECT query) with the original.