all files / semantic-graphql/src/ SemanticGraph.js

73.75% Statements 59/80
75% Branches 21/28
66.67% Functions 4/6
79.37% Lines 50/63
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const path = require('path');
const { readFileSync } = require('fs');
const createRdfParser = require('n3').Parser;
const {
  rdfIri, rdfsIri, owlIri, rdfsResource,
  rdfType, rdfsLabel, rdfsComment, rdfsDomain, rdfsRange, rdfsSubClassOf, rdfsSubPropertyOf, owlInverseOf,
} = require('./constants');
const invariant = require('./utils/invariant');
const isIri = require('./utils/isIri');
const requireGraphqlRelay = require('./requireGraphqlRelay');
const getGraphqlObjectType = require('./graphql/getGraphqlObjectType');
const getGraphqlInterfaceType = require('./graphql/getGraphqlInterfaceType');
const getGraphqlTypeResolver = require('./graphql/getGraphqlTypeResolver');
const getRelayConnectionDefinitions = require('./graphql/getRelayConnectionDefinitions');
 
const utf8 = 'utf-8';
const ttlParser = createRdfParser();
const parseFileAndIndex = (g, l) => ttlParser.parse(readFileSync(path.join(__dirname, l), utf8)).forEach(t => indexTriple(g, t));
 
const baseGraph = { nTriples: 0 };
const basePrefixes = {
  rdf: rdfIri,
  rdfs: rdfsIri,
  owl: owlIri,
};
 
// Only those predicates are useful for the lib, thus stored in the graph
const workingPredicates = [
  rdfType,
  rdfsLabel,
  rdfsComment,
  rdfsDomain,
  rdfsRange,
  rdfsSubClassOf,
  rdfsSubPropertyOf,
  owlInverseOf,
];
 
parseFileAndIndex(baseGraph, '../ontologies/rdf.ttl');
parseFileAndIndex(baseGraph, '../ontologies/rdfs.ttl');
parseFileAndIndex(baseGraph, '../ontologies/owl.ttl');
 
class SemanticGraph {
 
  constructor(resolvers, config = {}) {
    invariant(resolvers && typeof resolvers === 'object', 'Expected first arg to be an object');
    invariant(config && typeof config === 'object', 'Expected second arg to be an object');
    validateResolvers(resolvers);
 
    Object.assign(this, baseGraph, { config, resolvers });
 
    this.config.prefixes = Object.assign({}, basePrefixes, this.config.prefixes);
 
    Iif (config.relay) {
      const { fromGlobalId, nodeDefinitions } = requireGraphqlRelay();
      const resolveNode = (globalId, context, info) => this.resolvers.resolveResource(fromGlobalId(globalId).id, context, info);
      const resolveType = getGraphqlTypeResolver(this, rdfsResource);
 
      // Add this.nodeInterface and this.nodeField
      Object.assign(this, nodeDefinitions(resolveNode, resolveType));
    }
 
    this.addTriple = t => indexTriple(this, t);
    this.parse = (d, o) => createRdfParser(o).parse(d).forEach(this.addTriple);
    this.parseFile = (l, o, e = utf8) => this.parse(readFileSync(l, e), o);
    this.getObjectType = iri => getGraphqlObjectType(this, iri);
    this.getInterfaceType = iri => getGraphqlInterfaceType(this, iri);
    this.getEdgeType = iri => getRelayConnectionDefinitions(this, iri).edgeType;
    this.getConnectionType = iri => getRelayConnectionDefinitions(this, iri).connectionType;
    this.toString = () => `[SemanticGraph: ${this.nTriples} triples]`;
  }
 
  addFieldOnObjectType(classIri, fieldName, graphqlFieldConfig) {
    if (!this[classIri]) throw new Error(`Class not found: ${classIri}`);
 
    const iri = `http://CUSTOM_FIELD_${Math.random().toString().slice(2)}#${fieldName}`;
 
    this[iri] = { graphqlFieldConfig };
 
    indexTriple(this, {
      subject: iri,
      predicate: rdfsDomain,
      object: classIri,
    });
 
    return iri; // If the user wants to extend it later (why not)
  }
 
  extendFieldOnObjectType(classIri, propertyIri, graphqlFieldConfigExtension) {
    const x = this[classIri];
 
    if (!x) throw new Error(`Class not found: ${classIri}`);
 
    if (!x.graphqlFieldConfigExtensionMap) x.graphqlFieldConfigExtensionMap = {};
 
    x.graphqlFieldConfigExtensionMap[propertyIri] = graphqlFieldConfigExtension;
  }
 
}
 
/* Private methods */
 
function indexTriple(g, { subject, predicate, object }) {
  if (!workingPredicates.includes(predicate)) return;
  if (!(isIri(subject) && isIri(predicate)) || g[subject] && g[subject][predicate] && g[subject][predicate].includes(object)) return;
 
  upsert(g, subject, predicate, object);
 
  g.nTriples++;
 
  if (isIri(object)) upsert(g, object, `_${predicate}`, subject);
}
 
function upsert(theGuy, whoDid, what, kevinOffACliff) {
  const theGuyWhoDid = theGuy[whoDid];
 
  /*do you know*/theGuyWhoDid ?
  theGuyWhoDid[what] ?
  theGuyWhoDid[what].push(kevinOffACliff) :
  theGuyWhoDid[what] = [kevinOffACliff] : // ?!!??!
  theGuy[whoDid] = { [what]: [kevinOffACliff] };
}
 
const resolverNames = [
  'resolveSourceId',
  'resolveSourceTypes',
  'resolveSourcePropertyValue',
  'resolveResource',
  'resolveResources',
  'resolveResourcesByPredicate',
];
 
function validateResolvers(resolvers) {
  resolverNames.forEach(key => {
    const type = typeof resolvers[key];
 
    invariant(type === 'function', `Resolver validation: expected "${key}" to be a function, got ${type} instead.`);
  });
 
  return resolvers;
}
 
module.exports = SemanticGraph;