Class SPARQL2GraphQLHelper

java.lang.Object

se.liu.ida.hefquin.engine.wrappers.graphql.utils.SPARQL2GraphQLHelper

public class SPARQL2GraphQLHelper
extends Object

Provides helper functions for creating the necessary data in a GraphQL query.

Field Summary

Fields

Modifier and Type	Field	Description
protected final GraphQL2RDFConfiguration	config
protected final Map<TriplePattern,StarPattern>	connectors
protected final Map<org.apache.jena.graph.Node,StarPattern>	indexedStarPatterns
protected final GraphQLSchema	schema

Constructor Summary

Constructors

Constructor	Description
SPARQL2GraphQLHelper(GraphQL2RDFConfiguration config, GraphQLSchema schema, Map<org.apache.jena.graph.Node,StarPattern> indexedStarPatterns, Map<TriplePattern,StarPattern> connectors)

Method Summary

Modifier and Type	Method	Description
protected String	addEmptyObjectField(String currentPath, String sgpType, String predicateURI)	Helper function to add a field to the query that represents a nested object that only needs an id field (no more recursive calls)
protected Set<String>	addObjectField(StarPattern sp, String currentPath, String sgpType, String predicateURI)	Helper function to add a field to the query that represents a nested object.
protected String	addScalarField(String currentPath, String predicateURI)	Helper function to add a field to the query that represents a scalar value
Set<String>	addSgp(StarPattern sp, String currentPath, String sgpType)	Recursive function used to add fields from the triple patterns in a given star pattern
static boolean	hasAllNecessaryArguments(Set<String> sgpArgumentNames, Set<String> entrypointArgumentNames)	Check if @param sgpArgumentNames contains all argument name from @param entrypointArgumentNames.
static boolean	hasNecessaryArguments(Set<String> sgpArgumentNames, Set<String> entrypointArgumentNames)	Check if @param sgpArgumentNames have atleast one match with @param entrypointArgumentNames
protected static boolean	hasVariablePredicate(StarPattern sp)	Helper function which checks if any triple pattern predicate in @param sp is a variable or blank node, returns true if so
static org.apache.jena.atlas.json.JsonValue	literalToJsonValue(org.apache.jena.graph.impl.LiteralLabel literal)	Helper function used to convert a LiteralLabel value to a valid jsonvalue
GraphQLQuery	materializeAll()	Generates a GraphQL query that fetches everything from the GraphQL endpoint.

Methods inherited from class java.lang.Object

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

Field Details

config

protected final GraphQL2RDFConfiguration config

schema

protected final GraphQLSchema schema

indexedStarPatterns

protected final Map<org.apache.jena.graph.Node,StarPattern> indexedStarPatterns

connectors

protected final Map<TriplePattern,StarPattern> connectors

Constructor Details

SPARQL2GraphQLHelper

public SPARQL2GraphQLHelper(GraphQL2RDFConfiguration config,
 GraphQLSchema schema,
 Map<org.apache.jena.graph.Node,StarPattern> indexedStarPatterns,
 Map<TriplePattern,StarPattern> connectors)

Method Details

materializeAll

public GraphQLQuery materializeAll()

Generates a GraphQL query that fetches everything from the GraphQL endpoint.

addSgp

public Set<String> addSgp(StarPattern sp,
 String currentPath,
 String sgpType)

Recursive function used to add fields from the triple patterns in a given star pattern

addObjectField

protected Set<String> addObjectField(StarPattern sp,
 String currentPath,
 String sgpType,
 String predicateURI)

Helper function to add a field to the query that represents a nested object. Fields in that nested object are added recursively through addSgp

addEmptyObjectField

protected String addEmptyObjectField(String currentPath,
 String sgpType,
 String predicateURI)

Helper function to add a field to the query that represents a nested object that only needs an id field (no more recursive calls)

addScalarField

protected String addScalarField(String currentPath,
 String predicateURI)

Helper function to add a field to the query that represents a scalar value

hasVariablePredicate

protected static boolean hasVariablePredicate(StarPattern sp)

Helper function which checks if any triple pattern predicate in @param sp is a variable or blank node, returns true if so

hasNecessaryArguments

public static boolean hasNecessaryArguments(Set<String> sgpArgumentNames,
 Set<String> entrypointArgumentNames)

Check if @param sgpArgumentNames have atleast one match with @param entrypointArgumentNames

hasAllNecessaryArguments

public static boolean hasAllNecessaryArguments(Set<String> sgpArgumentNames,
 Set<String> entrypointArgumentNames)

Check if @param sgpArgumentNames contains all argument name from @param entrypointArgumentNames. If @param sgpArgumentNames is empty then returns false.

literalToJsonValue

public static org.apache.jena.atlas.json.JsonValue literalToJsonValue(org.apache.jena.graph.impl.LiteralLabel literal)

Helper function used to convert a LiteralLabel value to a valid jsonvalue