Package org.aksw.jena_sparql_api.mapper.jpa.criteria.expr

Class ExpressionCompiler

java.lang.Object

org.aksw.jena_sparql_api.mapper.jpa.criteria.expr.ExpressionCompiler

All Implemented Interfaces:

ExpressionVisitor<org.apache.jena.sparql.expr.Expr>, PathVisitor<org.apache.jena.sparql.expr.Expr>

public class ExpressionCompiler
extends Object
implements ExpressionVisitor<org.apache.jena.sparql.expr.Expr>

Compiles JPA criteria expressions to SPARQL expressions. The principle is, that JPA path expressions are compiled to SPARQL graph patterns (Jena's Element), of which have a 'target' variable. The target variable can participate in further expressions.

Author:

raven

Field Summary

Fields

Modifier and Type	Field	Description
protected Collection<org.apache.jena.sparql.syntax.Element>	elements
protected Function<VPath<?>,org.apache.jena.sparql.core.Var>	pathHandler
protected org.apache.jena.datatypes.TypeMapper	typeMapper

Constructor Summary

Constructors

Constructor	Description
ExpressionCompiler(Collection<org.apache.jena.sparql.syntax.Element> elements, Function<VPath<?>,org.apache.jena.sparql.core.Var> pathHandler)

Method Summary

Modifier and Type	Method	Description
org.apache.jena.sparql.expr.Expr	appendExpr(BinaryOperatorExpression<Boolean> e, BiFunction<org.apache.jena.sparql.expr.Expr,org.apache.jena.sparql.expr.Expr,org.apache.jena.sparql.expr.Expr> op)
Collection<org.apache.jena.sparql.syntax.Element>	getElements()
org.apache.jena.sparql.expr.Expr	visit(AvgExpression e)
org.apache.jena.sparql.expr.Expr	visit(EqualsExpression e)
org.apache.jena.sparql.expr.Expr	visit(GreaterThanExpression e)
org.apache.jena.sparql.expr.Expr	visit(GreaterThanOrEqualToExpression e)
org.apache.jena.sparql.expr.Expr	visit(GreatestExpression<?> e)
org.apache.jena.sparql.expr.Expr	visit(LogicalAndExpression e)
org.apache.jena.sparql.expr.Expr	visit(LogicalNotExpression e)
org.apache.jena.sparql.expr.Expr	visit(ValueExpression<?> e)
org.apache.jena.sparql.expr.Expr	visit(VPath<?> e)

Methods inherited from class java.lang.Object

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

Field Details

typeMapper

protected org.apache.jena.datatypes.TypeMapper typeMapper

pathHandler

protected Function<VPath<?>,org.apache.jena.sparql.core.Var> pathHandler

elements

protected Collection<org.apache.jena.sparql.syntax.Element> elements

Constructor Details

ExpressionCompiler

public ExpressionCompiler(Collection<org.apache.jena.sparql.syntax.Element> elements,
 Function<VPath<?>,org.apache.jena.sparql.core.Var> pathHandler)

Method Details

getElements

public Collection<org.apache.jena.sparql.syntax.Element> getElements()

visit

public org.apache.jena.sparql.expr.Expr visit(VPath<?> e)

Specified by:

visit in interface PathVisitor<org.apache.jena.sparql.expr.Expr>

visit

public org.apache.jena.sparql.expr.Expr visit(LogicalAndExpression e)

Specified by:

visit in interface ExpressionVisitor<org.apache.jena.sparql.expr.Expr>

visit

public org.apache.jena.sparql.expr.Expr visit(EqualsExpression e)

Specified by:

visit in interface ExpressionVisitor<org.apache.jena.sparql.expr.Expr>

visit

public org.apache.jena.sparql.expr.Expr visit(GreaterThanExpression e)

Specified by:

visit in interface ExpressionVisitor<org.apache.jena.sparql.expr.Expr>

visit

public org.apache.jena.sparql.expr.Expr visit(GreaterThanOrEqualToExpression e)

Specified by:

visit in interface ExpressionVisitor<org.apache.jena.sparql.expr.Expr>

appendExpr

public org.apache.jena.sparql.expr.Expr appendExpr(BinaryOperatorExpression<Boolean> e,
 BiFunction<org.apache.jena.sparql.expr.Expr,org.apache.jena.sparql.expr.Expr,org.apache.jena.sparql.expr.Expr> op)

visit

public org.apache.jena.sparql.expr.Expr visit(LogicalNotExpression e)

Specified by:

visit in interface ExpressionVisitor<org.apache.jena.sparql.expr.Expr>

visit

public org.apache.jena.sparql.expr.Expr visit(GreatestExpression<?> e)

Specified by:

visit in interface ExpressionVisitor<org.apache.jena.sparql.expr.Expr>

visit

public org.apache.jena.sparql.expr.Expr visit(AvgExpression e)

Specified by:

visit in interface ExpressionVisitor<org.apache.jena.sparql.expr.Expr>

visit

public org.apache.jena.sparql.expr.Expr visit(ValueExpression<?> e)

Specified by:

visit in interface ExpressionVisitor<org.apache.jena.sparql.expr.Expr>