Package org.aksw.jenax.graphql.sparql

Class GraphQlToSparqlConverter

java.lang.Object

org.aksw.jenax.graphql.sparql.GraphQlToSparqlConverter

public class GraphQlToSparqlConverter
extends Object

Compiles a graphql query to a GraphQlToSparqlMapping instance. All fields can be qualified with IRIs of properties and classes. Names of unqualified fields are passed to a GraphQlResolver for resolution to IRIs. All resolver methods are allowed to throw UnsupportedOperationException to indicate absence of resolution support.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	GraphQlToSparqlConverter.GraphQlQueryWorker

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	jsonMode	false -> rdf mode, true -> json mode
protected GraphQlResolver	resolver

Constructor Summary

Constructors

Constructor	Description
GraphQlToSparqlConverter(GraphQlResolver resolver, boolean jsonMode)

Method Summary

Modifier and Type	Method	Description
GraphQlToSparqlMapping	convertDocument(graphql.language.Document document, Map<String,graphql.language.Value<?>> assignments)
static String	deriveFieldIri(Context context, String fieldName)
static ScopedCardinality	getCardinality(graphql.language.Directive d)	Return a cardinality object if the directive is @one or @many - null if neither.
static ScopedCardinality	getCardinality(graphql.language.DirectivesContainer<?> container)	Returns the last @one or @many directive - null if there is none.
static void	processSparqlDirectives(Context cxt, GraphQlResolver resolver)
static org.apache.jena.graph.Node	resolveClass(GraphQlResolver resolver, Context cxt, String fieldName)
NodeQuery	resolveKeyToClasses(NodeQuery nq, org.apache.jena.graph.Node cls)
org.aksw.jenax.path.core.FacetPath	resolveProperty(Context cxt, String fieldName)	This method uses the context to resolve a field name to a relative facet path
static Context	setupContext(Context cxt)	Parses a GraphQL node's rdf annotations.
static void	tryApplySlice(NodeQuery nodeQuery, com.google.common.collect.Multimap<String,graphql.language.Value<?>> args, Map<String,graphql.language.Value<?>> assignments)
static org.apache.jena.riot.system.PrefixMap	tryGetPrefixMap(graphql.language.Value<?> value)
static com.google.common.collect.Range<Long>	tryParseSlice(com.google.common.collect.Multimap<String,graphql.language.Value<?>> args, Map<String,graphql.language.Value<?>> assignments)	Returns null if neither offset nor limit is found
static org.aksw.jenax.sparql.fragment.api.Fragment	tryParseSparqlQuery(Context cxt, graphql.language.Directive dir, String argName)

Methods inherited from class java.lang.Object

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

Field Details

resolver

protected GraphQlResolver resolver

jsonMode

protected boolean jsonMode

false -> rdf mode, true -> json mode

Constructor Details

GraphQlToSparqlConverter

public GraphQlToSparqlConverter(GraphQlResolver resolver,
 boolean jsonMode)

Method Details

convertDocument

public GraphQlToSparqlMapping convertDocument(graphql.language.Document document,
 Map<String,graphql.language.Value<?>> assignments)

setupContext

public static Context setupContext(Context cxt)

Parses a GraphQL node's rdf annotations.

deriveFieldIri

public static String deriveFieldIri(Context context,
 String fieldName)

processSparqlDirectives

public static void processSparqlDirectives(Context cxt,
 GraphQlResolver resolver)

tryParseSparqlQuery

public static org.aksw.jenax.sparql.fragment.api.Fragment tryParseSparqlQuery(Context cxt,
 graphql.language.Directive dir,
 String argName)

tryParseSlice

public static com.google.common.collect.Range<Long> tryParseSlice(com.google.common.collect.Multimap<String,graphql.language.Value<?>> args,
 Map<String,graphql.language.Value<?>> assignments)

Returns null if neither offset nor limit is found

resolveProperty

public org.aksw.jenax.path.core.FacetPath resolveProperty(Context cxt,
 String fieldName)

This method uses the context to resolve a field name to a relative facet path

resolveClass

public static org.apache.jena.graph.Node resolveClass(GraphQlResolver resolver,
 Context cxt,
 String fieldName)

resolveKeyToClasses

public NodeQuery resolveKeyToClasses(NodeQuery nq,
 org.apache.jena.graph.Node cls)

tryApplySlice

public static void tryApplySlice(NodeQuery nodeQuery,
 com.google.common.collect.Multimap<String,graphql.language.Value<?>> args,
 Map<String,graphql.language.Value<?>> assignments)

tryGetPrefixMap

public static org.apache.jena.riot.system.PrefixMap tryGetPrefixMap(graphql.language.Value<?> value)

getCardinality

public static ScopedCardinality getCardinality(graphql.language.DirectivesContainer<?> container)

Returns the last @one or @many directive - null if there is none.

getCardinality

public static ScopedCardinality getCardinality(graphql.language.Directive d)

Return a cardinality object if the directive is @one or @many - null if neither.