com.epimorphics.lda.support

Class PropertyChainTranslator

java.lang.Object

com.epimorphics.lda.support.PropertyChainTranslator

public class PropertyChainTranslator
extends Object

A PropertyChainTranslator is initialised with a bunch of property chains and can then be used to create components of a SPARQL query.

Each property chain X = P.Q ... generates a SPARQL clause OPTIONAL {?item P ?v1. OPTIONAL {?v1 Q ?v2}} etc. The variables are allocated by a VarSupply supplied as a parameter.

Author:

chris

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PropertyChainTranslator.Vars

Constructor Summary

Constructors

Constructor and Description
PropertyChainTranslator(List<PropertyChain> chains) Initialise this translator with the given list of property chains.
PropertyChainTranslator(PropertyChain... chains) Initialise this translator with the given array of property chains.

Method Summary

Methods

Modifier and Type	Method and Description
String	translate(PropertyChainTranslator.Vars vars, String subjectVar, boolean dropLast)
String	translate(VarSupply vs, boolean dropLast) Translate this collection of property chains to the corresponding SPARQL clauses.
String	translate(VarSupply vs, String subjectVar, boolean dropLast) Translate this collection of property chains to the corresponding SPARQL optional clauses.

Methods inherited from class java.lang.Object

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

Constructor Detail

PropertyChainTranslator

public PropertyChainTranslator(List<PropertyChain> chains)

Initialise this translator with the given list of property chains.

PropertyChainTranslator

public PropertyChainTranslator(PropertyChain... chains)

Initialise this translator with the given array of property chains.

Method Detail

translate

public String translate(VarSupply vs,
               boolean dropLast)

Translate this collection of property chains to the corresponding SPARQL clauses. The initial subject variable name is "item". Allocate new variables from the VarSupply.

translate

public String translate(VarSupply vs,
               String subjectVar,
               boolean dropLast)

Translate this collection of property chains to the corresponding SPARQL optional clauses. The initial subject variable name is given by subjectVar. Allocate new variables from the VarSupply.

translate

public String translate(PropertyChainTranslator.Vars vars,
               String subjectVar,
               boolean dropLast)