org.aksw.sparqlify.core.cast

Interface TypeSystem

All Superinterfaces:

SparqlFunctionProvider

All Known Implementing Classes:

TypeSystemImpl

public interface TypeSystem
extends SparqlFunctionProvider

Purposes of the type system are storing information about the following items: - Mapping of TypeTokens to actual SQL type names. e.g.TypeToken.String -> text (postgres) - SQL Model - available SQL function signatures e.g. boolean ST_INTERSECTS(geometry, geometry) - type hierarchy - coercions - Rewrites of SPARQL functions to SQL functions e.g. ogc:intersects(?a, ?b) -> typedLiteral(ST_INTERSECTS(?a, ?b), xsd:boolean) - Mapping of SPARQL datatypes to SQL ones - Thereby generation of appropriate cast expressions e.g. ogc:WKT -> geometry "POINT(0 0)"^^ogc:geometry -> "POINT(0 0)"::geometry Nodes on converting between SPARQL and SQL datatypes:

Author:

Claus Stadler

Method Summary

Methods

Modifier and Type	Method and Description
SqlValue	cast(SqlValue value, TypeToken targetType)
Factory1<SqlExpr>	cast(TypeToken fromTypeUri, TypeToken toTypeUri) Return a factory for creating cast-expressions between the given datatypes Null if no such cast exists.
SqlValue	convertSql(com.hp.hpl.jena.sparql.expr.NodeValue value)
org.aksw.sparqlify.core.cast.CoercionSystem<TypeToken,org.aksw.sparqlify.core.cast.SqlValueTransformer>	getCoercionSystem()
Collection<T>	getDirectSuperTypes(T name)
org.aksw.commons.collections.multimaps.IBiSetMultimap<TypeToken,TypeToken>	getPhysicalTypeMap()
com.google.common.collect.Multimap<String,String>	getSparqlSqlDecls()
FunctionModelMeta	getSqlFunctionMetaModel()
FunctionModel<TypeToken>	getSqlFunctionModel()
Map<String,SqlExprEvaluator>	getSqlImpls()
SqlTypeMapper	getSqlTypeMapper()
com.hp.hpl.jena.datatypes.TypeMapper	getTypeMapper() An object that can convert between Java Objects and NodeValues
boolean	isSuperClassOf(TypeToken a, TypeToken b) Deprecated.
void	registerCoercion(XMethod method) Deprecated.
void	registerLiteralMapper(String typeUri, SqlLiteralMapper mapper) Conversion of RDF datatypes to SQL literals
void	registerSparqlFunction(SparqlFunction sparqlFunction)
void	registerSqlFunction(XMethod sqlFunction) Deprecated.
XClass	resolve(String typeName)
Set<TypeToken>	supremumDatatypes(TypeToken from, TypeToken to) Deprecated.

Methods inherited from interface org.aksw.sparqlify.core.cast.SparqlFunctionProvider

getSparqlFunction

Method Detail

getCoercionSystem

org.aksw.sparqlify.core.cast.CoercionSystem<TypeToken,org.aksw.sparqlify.core.cast.SqlValueTransformer> getCoercionSystem()

registerSparqlFunction

void registerSparqlFunction(SparqlFunction sparqlFunction)

registerSqlFunction

@Deprecated
void registerSqlFunction(XMethod sqlFunction)

Deprecated.

Makes an SQL function known to the system

Parameters:

sqlFunction -

registerLiteralMapper

void registerLiteralMapper(String typeUri,
                         SqlLiteralMapper mapper)

Conversion of RDF datatypes to SQL literals

Parameters:

typeToken -

mapper -

getTypeMapper

com.hp.hpl.jena.datatypes.TypeMapper getTypeMapper()

An object that can convert between Java Objects and NodeValues

Returns:

getSqlTypeMapper

SqlTypeMapper getSqlTypeMapper()

registerCoercion

@Deprecated
void registerCoercion(XMethod method)

Deprecated.

Parameters:

method -

cast

SqlValue cast(SqlValue value,
            TypeToken targetType)

convertSql

SqlValue convertSql(com.hp.hpl.jena.sparql.expr.NodeValue value)

cast

Factory1<SqlExpr> cast(TypeToken fromTypeUri,
                     TypeToken toTypeUri)

Return a factory for creating cast-expressions between the given datatypes Null if no such cast exists. Constant folding may be performed, but do not rely on it. So cast(string, int).create(NodeValue.makeString('666')) may return Cast((string, int), NodeValue('666')) rather than NodeValue.makeInteger(666)

isSuperClassOf

@Deprecated
boolean isSuperClassOf(TypeToken a,
                                TypeToken b)

Deprecated.

supremumDatatypes

@Deprecated
Set<TypeToken> supremumDatatypes(TypeToken from,
                                          TypeToken to)

Deprecated.

getSparqlSqlDecls

com.google.common.collect.Multimap<String,String> getSparqlSqlDecls()

getSqlImpls

Map<String,SqlExprEvaluator> getSqlImpls()

getSqlFunctionModel

FunctionModel<TypeToken> getSqlFunctionModel()

getSqlFunctionMetaModel

FunctionModelMeta getSqlFunctionMetaModel()

getPhysicalTypeMap

org.aksw.commons.collections.multimaps.IBiSetMultimap<TypeToken,TypeToken> getPhysicalTypeMap()

resolve

XClass resolve(String typeName)

getDirectSuperTypes

Collection<T> getDirectSuperTypes(T name)