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import { Store } from "./store";
import { rdf, rdfs } from "../ontologies";
import { Uri } from "./uri";
import { dataFactory } from "./data-factory";
const { namedNode, blankNode } = dataFactory;
/**
* Parameters for matching triples in the store.
*/
export interface QueryOptions {
/**
* Indicates if inferred triples should be included in the result. If `undefined`,
* the default value is `true` when a reasoner associated with the store and `false` otherwise.
*/
includeInferred?: boolean;
}
/**
* Parameters for querying resources in the store that have an explicitly asserted type in the document.
*/
export interface DefinitionQueryOptions extends QueryOptions {
/**
* URI of the vocabulary that defines the resources. If `null`, returns only resources that have no `rdfs:isDefinedBy` property.
*/
definedBy?: string | null;
/**
* URIs of the vocabularies in which the resources must not be defined, either by sharing a namespace or by `rdfs:isDefinedBy`.
*/
notDefinedBy?: Set<string>;
/**
* Indicate if terms what are not *defined* in the ontology should be included in the result (default: false).
*/
includeReferenced?: boolean;
/**
* Indicate if blank nodes should be included in the result (default: false).
*/
includeBlankNodes?: boolean;
}
/**
* Parameters for store queries that support filtering on the type of resource.
*/
export interface TypedInstanceQueryOptions extends QueryOptions {
/**
* Indicate if instances of a subclasses of the type should be included in the result.
*/
includeSubTypes?: boolean;
}
/**
* Maps a language tag to the number of occurrences in the document.
*/
export interface LanguageTagUsageStats {
[key: string]: number;
}
/**
* Maps a predicate IRI to information about its usage in the document.
*/
export interface PredicateUsageStats {
[key: string]: PredicateUsageInfo;
}
/**
* Information about the usage of a single predicate in a document.
*/
export interface PredicateUsageInfo {
/**
* The predicate IRI.
*/
predicateIri: string;
/**
* The set of subjects that use the predicate.
*/
subjects: Set<string>;
/**
* The number of occurrences of the predicate in a document.
*/
usageFrequency: number;
/**
* Information about the language tags used in the object of triples with the predicate.
*/
languageTags: { [key: string]: number };
}
/**
* A repository for retrieving resources from graphs.
*/
export class ResourceRepository {
/**
* The RDF triple store.
*/
readonly store: Store;
constructor(store: Store) {
this.store = store;
}
/**
* Inidiates if a node should not be included in the result of a definition query.
* @param graphUris URIs of the graphs to search.
* @param subject The focus node.
* @param options Definition query options.
* @param optionDefaults Custom default values for the query options.
* @returns
*/
protected skip(graphUris: string | string[] | undefined, subject: Quad_Subject | Quad_Object, options?: DefinitionQueryOptions, optionDefaults: DefinitionQueryOptions = { includeBlankNodes: false, includeReferenced: false }): boolean {
const opts = { ...optionDefaults, ...options };
if (!opts.includeBlankNodes && subject.termType !== "NamedNode") {
// We are only interested in named nodes.
return true;
}
const s = subject as Quad_Subject;
if (!opts.includeReferenced && !this.hasSubject(graphUris, subject)) {
// Skip the node if it is not explicitly defined in the graph as a subject.
return true;
}
if (opts?.definedBy !== undefined) {
const isDefined = this.isDefinedBy(graphUris, s, opts.definedBy);
// Do not skip the node if it has a different namespace but is *explicitly* defined by the given URI.
if (opts.definedBy === null && isDefined || opts.definedBy !== null && !isDefined) {
return true;
}
} else if (opts?.notDefinedBy !== undefined) {
for (const source of opts.notDefinedBy) {
if (this.isDefinedBy(graphUris, s, source)) {
return true;
}
} s
}
return false;
}
/**
* Indicate if a given URI exists as the subject of a triple in the graph.
* @param graphUris URIs of the graphs to search.
* @param subjectUri URI of the subject to search for.
* @returns true if the URI is a subject, false otherwise.
*/
hasSubject(graphUris: string | string[] | undefined, subjectUri: string | Quad_Subject | Quad_Object): boolean {
let s;
if (typeof subjectUri === "string") {
s = namedNode(subjectUri);
} else if (EsubjectUri.termType !== "Literal") {
s = subjectUri;
}
Eif (s) {
for (let _ of this.store.matchAll(graphUris, s, null, null, false)) {
return true;
}
}
return false;
}
/**
* Indicate if a node is explicitly defined by the given URI using the `rdfs:isDefinedBy` property, or implicitly by sharing the same namespace.
* @param graphUris URIs of the graphs to search.
* @param node A named node to check if it is defined by the given URI.
* @param definedBy URI of the vocabulary that defines the resource (rdfs:isDefinedBy). Provide `null` to only return resources that have no `rdfs:isDefinedBy` property.
* @returns `true` if the node is defined by the given URI, `false` otherwise.
*/
isDefinedBy(graphUris: string | string[] | undefined, node: Quad_Subject, definedBy: string | null): boolean {
const s = node;
if (definedBy === null) {
// If there is no definedBy URI, we assume that the resource is not
// explicitly defined by any ontology.
for (let _ of this.store.matchAll(graphUris, s, rdfs.isDefinedBy, null)) {
return true;
}
}
else {
// We assume that a resource is defined by an ontology if it starts with the namespace of the ontology.
if (node.value.startsWith(definedBy)) {
return true;
}
// If the ontology is something like <http://purl.obolibrary.org/obo/bfo.owl> or <http://www.w3.org/ns/prov#>
// and the subject is <http://purl.obolibrary.org/obo/BFO_0000001> or <http://www.w3.org/ns/prov#Entity>
// then we assume that it is defined by the ontology. The OBO case shows that we need to remove the file
// name in oder to be able to compare the namespace URIs.
const ontologyNamespace = Uri.getNormalizedUri(Uri.getNamespaceIri(definedBy));
const subjectNamespace = Uri.getNormalizedUri(Uri.getNamespaceIri(node.value));
if (subjectNamespace === ontologyNamespace) {
return true;
}
const o = namedNode(Uri.getNormalizedUri(definedBy));
// The explicit annotation of the definition source has precedence over heuristic checks.
for (let q of this.store.matchAll(graphUris, s, rdfs.isDefinedBy, null)) {
if (Uri.getNormalizedUri(q.object.value) === o.value) {
return true;
}
}
// A blank node is defined in the namespace if it is the object of a triple that is defined by the URI.
if (s.termType === "BlankNode") {
for (let q of this.store.matchAll(graphUris, null, null, s, false)) {
return this.isDefinedBy(graphUris, q.subject, definedBy)
}
}
}
return false;
}
/**
* Indicate if a resource has a given type in the graph.
* @param graphUris URIs of the graphs to search.
* @param subjectUri URI or blank node id of the subject to match.
* @param typeUri URI of the type to match.
* @param options Optional query parameters.
* @returns `true` if the resource has the type, `false` otherwise.
*/
hasType(graphUris: string | string[] | undefined, subjectUri: string, typeUri: string, options?: QueryOptions): boolean {
const o = namedNode(typeUri);
for (let _ of this.store.matchAll(graphUris, namedNode(subjectUri), rdf.type, o, options?.includeInferred)) {
return true;
}
for (let _ of this.store.matchAll(graphUris, blankNode(subjectUri), rdf.type, o, options?.includeInferred)) {
return true;
}
return false;
}
/**
* Get information about the usage of predicates in the document such as the frequency of use and the use of language tags.
* @param graphUris URIs of the graphs to search.
* @param predicateUris URIs of the predicates to match.
*/
getPredicateUsageStats(graphUris: string | string[] | undefined, predicateUris: string[] | undefined = undefined): PredicateUsageStats {
const result: PredicateUsageStats = {};
const predicates = predicateUris ? new Set(predicateUris) : undefined;
for (let q of this.store.matchAll(graphUris, null, null, null, false)) {
if (predicates && !predicates.has(q.predicate.value)) {
continue;
}
// Create stats for all predicates and add language tags for literals if available.
let predicateStats = result[q.predicate.value];
if (!predicateStats) {
predicateStats = {
predicateIri: q.predicate.value,
subjects: new Set<string>(),
usageFrequency: 0,
languageTags: {}
};
result[q.predicate.value] = predicateStats;
}
predicateStats.subjects.add(q.subject.value);
predicateStats.usageFrequency++;
Eif (q.object.termType === "Literal") {
let language = q.object.language;
if (!predicateStats.languageTags[language]) {
predicateStats.languageTags[language] = 1;
} else {
predicateStats.languageTags[language] += 1;
}
}
}
return result;
}
/**
* Get the language tags used in the object of triples with a given set of predicates.
* @param graphUris URIs of the graphs to search.
* @param predicateUris URIs of the predicates to match.
* @returns An array of language tag statistics, sorted by the number of occurrences in descending order.
*/
getLanguageTagUsageStats(graphUris: string | string[] | undefined): LanguageTagUsageStats {
const stats: LanguageTagUsageStats = {};
for (let q of this.store.matchAll(graphUris, null, null, null, false)) {
if (q.object.termType === "Literal" && q.object.language) {
const language = q.object.language;
if (!stats[language]) {
stats[language] = 1;
} else {
stats[language] += 1;
}
}
}
return stats;
}
/**
* Get the most frequently used language tag in the object of triples with a given set of predicates.
* @param graphUris URIs of the graphs to search.
*/
getMostFrequentLanguageTag(graphUris: string | string[] | undefined): string | undefined {
let stats = this.getLanguageTagUsageStats(graphUris);
let max = 0;
let primary: string | undefined;
for (let language in stats) {
if (stats[language] > max) {
max = stats[language];
primary = language;
}
}
return primary;
}
} |