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

Class PathResolverVarMapper

java.lang.Object

org.aksw.jena_sparql_api.mapper.jpa.criteria.PathResolverVarMapper

All Implemented Interfaces:

PathVisitor<org.apache.jena.sparql.core.Var>

public class PathResolverVarMapper
extends Object
implements PathVisitor<org.apache.jena.sparql.core.Var>

Maps criteria path objects to mapping of variables. Use every instance only for resolving a single path - then discard this visitor, because of its internal state change. Use a supplier of such visitors for handling multiple paths.

Author:

raven

Field Summary

Fields

Modifier and Type	Field	Description
protected Function<javax.persistence.criteria.Expression<?>,String>	aliasMapper
protected PathResolver	currentState
protected Set<org.apache.jena.sparql.syntax.Element>	elements

Constructor Summary

Constructors

Constructor	Description
PathResolverVarMapper(PathResolver currentState, Set<org.apache.jena.sparql.syntax.Element> elements, Function<javax.persistence.criteria.Expression<?>,String> aliasMapper)

Method Summary

Modifier and Type	Method	Description
static <T> Stream<T>	enumerate(T item, Function<? super T,T> predecessorFn)
Set<org.apache.jena.sparql.syntax.Element>	getElements()
static <T> T	getFirstItem(T item, Function<T,T> predecessor)
static Class<?>	getRootClass(javax.persistence.criteria.Path<?> path)
static javax.persistence.criteria.Path<?>	getRootPath(javax.persistence.criteria.Path<?> path)
org.apache.jena.sparql.core.Var	visit(VPath<?> path)	Resolve a given path against a given path resolver.

Methods inherited from class java.lang.Object

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

Field Details

currentState

protected PathResolver currentState

elements

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

aliasMapper

protected Function<javax.persistence.criteria.Expression<?>,String> aliasMapper

Constructor Details

PathResolverVarMapper

public PathResolverVarMapper(PathResolver currentState,
 Set<org.apache.jena.sparql.syntax.Element> elements,
 Function<javax.persistence.criteria.Expression<?>,String> aliasMapper)

Method Details

getElements

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

visit

public org.apache.jena.sparql.core.Var visit(VPath<?> path)

Resolve a given path against a given path resolver. Appends any yeld elements to 'elemenents' and returns the path's corresponding pair of (source, target) variables.

Specified by:

visit in interface PathVisitor<org.apache.jena.sparql.core.Var>

enumerate

public static <T> Stream<T> enumerate(T item,
 Function<? super T,T> predecessorFn)

getFirstItem

public static <T> T getFirstItem(T item,
 Function<T,T> predecessor)

getRootPath

public static javax.persistence.criteria.Path<?> getRootPath(javax.persistence.criteria.Path<?> path)

getRootClass

public static Class<?> getRootClass(javax.persistence.criteria.Path<?> path)