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BasicStore.ts
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BasicStore.ts
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/* Parts taken, stripped and modified from rdflib.js */
import rdfFactory, {
DataFactory,
Feature,
LowLevelStore,
NamedNode,
Quad,
QuadPosition,
Quadruple,
SomeTerm,
} from "@ontologies/core";
import { SomeNode } from "../types";
export interface IndexedFormulaOpts {
quads: Quad[];
dataCallback: (quad: Quad) => void;
rdfFactory: DataFactory;
}
/** Query and modify an array of quads. */
export default class BasicStore implements LowLevelStore {
public readonly rdfFactory: DataFactory;
public readonly quads: Quad[] = [];
public readonly dataCallbacks: Array<(quad: Quad) => void>;
public readonly removeCallback: ((quad: Quad) => void) | undefined;
/** Returns the number of quads in the store. */
public length: number = 0;
constructor(opts: Partial<IndexedFormulaOpts> = {}) {
this.dataCallbacks = [];
this.quads = opts.quads || [];
this.rdfFactory = opts.rdfFactory || rdfFactory;
this.rdfArrayRemove = this.rdfFactory.supports?.[Feature.identity]
? this.identityRemove
: this.searchRemove;
Object.defineProperty(this, "length", {
get(): number {
return this.quads.length;
},
set(value: number): void {
this.quads.length = value;
},
});
}
/** Add a quad to the store. */
public add(
subject: SomeNode,
predicate: NamedNode,
object: SomeTerm,
graph: SomeNode = this.rdfFactory.defaultGraph(),
): Quad {
const existing = this.match(subject, predicate, object, graph || null, true)[0];
if (existing) {
return existing;
}
const st = this.rdfFactory.quad(subject, predicate, object, graph as NamedNode);
this.quads.push(st);
if (this.dataCallbacks) {
for (const callback of this.dataCallbacks) {
callback(st);
}
}
return st;
}
public addQuad(quad: Quad): Quad {
return this.add(quad.subject, quad.predicate, quad.object, quad.graph);
}
public addQuads(quads: Quad[]): Quad[] {
return quads.map((quad) => this.add(quad.subject, quad.predicate, quad.object, quad.graph));
}
public addQuadruple(qdr: Quadruple): Quadruple {
const quad = this.add(
qdr[QuadPosition.subject],
qdr[QuadPosition.predicate],
qdr[QuadPosition.object],
qdr[QuadPosition.graph],
);
return [quad.subject, quad.predicate, quad.object, quad.graph];
}
public addQuadruples(qdrs: Quadruple[]): Quadruple[] {
return qdrs.map((qdr) => this.addQuadruple(qdr));
}
public addDataCallback(callback: (q: Quad) => void): void {
this.dataCallbacks.push(callback);
}
/** Remove a quad from the store */
public remove(st: Quad): this {
const sts = this.match(
st.subject,
st.predicate,
st.object,
st.graph,
);
if (!sts.length) {
throw new Error(`Quad to be removed is not on store: ${st}`);
}
this.removeQuad(sts[0]);
return this;
}
/** Remove a quad from the store */
public removeQuad(quad: Quad): this {
this.rdfArrayRemove(this.quads, quad);
if (this.removeCallback) {
this.removeCallback(quad);
}
return this;
}
public removeQuads(quads: Quad[]): this {
// Ensure we don't loop over the array we're modifying.
const toRemove = quads.slice();
for (let i = 0; i < toRemove.length; i++) {
this.remove(toRemove[i]);
}
return this;
}
/** Search the Store */
public match(
subject: SomeNode | null,
predicate: NamedNode | null,
object: SomeTerm | null,
graph: SomeNode | null,
justOne: boolean = false,
): Quad[] {
const factory = this.rdfFactory;
const filter = (q: Quad): boolean =>
(subject === null || factory.equals(q.subject, subject))
&& (predicate === null || factory.equals(q.predicate, predicate))
&& (object === null || factory.equals(q.object, object))
&& (graph === null || factory.equals(q.graph, graph));
if (justOne) {
const res = this.quads.find(filter);
return res ? [res] : [];
}
return this.quads.filter(filter);
}
// tslint:disable-next-line:no-empty
public rdfArrayRemove(_arr: Quad[], _quad: Quad): void {}
public identityRemove(arr: Quad[], quad: Quad): void {
arr[arr.indexOf(quad)] = arr[arr.length - 1];
arr.pop();
}
public searchRemove(arr: Quad[], quad: Quad): void {
const factory = this.rdfFactory;
const index = arr.findIndex((q: Quad) => factory.equals(quad, q));
arr.splice(index, 1);
}
}