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72 lines
2.1 KiB
72 lines
2.1 KiB
import type {
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ProxyContextOptions,
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SubjectProxy,
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SetProxy,
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} from "@ldo/jsonld-dataset-proxy";
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import { ProxyContext } from "@ldo/jsonld-dataset-proxy";
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import type { QuadMatch } from "@ldo/rdf-utils";
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import type {
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nodeEventListener,
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SubscribableDataset,
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} from "@ldo/subscribable-dataset";
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import type { BlankNode, NamedNode, Quad } from "@rdfjs/types";
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import { createTrackingSubjectProxy } from "./TrackingSubjectProxy";
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import { createTrackingSetProxy } from "./TrackingSetProxy";
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/**
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* @internal
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* Options to be passed to the tracking proxy
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*/
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export interface TrackingProxyContextOptions extends ProxyContextOptions {
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dataset: SubscribableDataset<Quad>;
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}
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/**
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* @internal
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* A listener that gets triggered whenever there's an update
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*/
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/**
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* @internal
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* This proxy exists to ensure react components rerender at the right time. It
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* keeps track of every key accessed in a Linked Data Object and only when the
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* dataset is updated with that key does it rerender the react component.
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*/
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export class TrackingProxyContext extends ProxyContext {
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private listener: nodeEventListener<Quad>;
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private subscribableDataset: SubscribableDataset<Quad>;
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constructor(
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options: TrackingProxyContextOptions,
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listener: nodeEventListener<Quad>,
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) {
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super(options);
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this.subscribableDataset = options.dataset;
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this.listener = listener;
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}
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// Adds the listener to the subscribable dataset while ensuring deduping of the listener
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public addListener(eventName: QuadMatch) {
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const listeners = this.subscribableDataset.listeners(eventName);
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if (!listeners.includes(this.listener)) {
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this.subscribableDataset.on(eventName, this.listener);
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}
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}
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protected createNewSubjectProxy(node: NamedNode | BlankNode): SubjectProxy {
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return createTrackingSubjectProxy(this, node);
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}
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protected createNewSetProxy(
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quadMatch: QuadMatch,
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isSubjectOriented?: boolean,
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isLangStringSet?: boolean,
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): SetProxy {
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return createTrackingSetProxy(
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this,
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quadMatch,
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isSubjectOriented,
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isLangStringSet,
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);
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}
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}
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