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feat: Update RepresentationMetadata to store triples
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,47 +1,130 @@ | ||
| /** | ||
| * Contains metadata relevant to a representation. | ||
| */ | ||
| import type { Quad } from 'rdf-js'; | ||
| import { quad as createQuad, literal, namedNode } from '@rdfjs/data-model'; | ||
| import { Store } from 'n3'; | ||
| import type { BlankNode, Literal, NamedNode, Quad, Term } from 'rdf-js'; | ||
|
|
||
| /** | ||
| * Metadata corresponding to a {@link Representation}. | ||
| * Stores the metadata triples and provides methods for easy access. | ||
| */ | ||
| export interface RepresentationMetadata { | ||
| export class RepresentationMetadata { | ||
| private store: Store; | ||
| private id: NamedNode | BlankNode; | ||
|
|
||
| /** | ||
| * All metadata triples of the resource. | ||
| * @param identifier - Identifier of the resource relevant to this metadata. | ||
| * A blank node will be generated if none is provided. | ||
| * Strings will be converted to named nodes. @ignored | ||
| * @param quads - Quads to fill the metadata with. @ignored | ||
| * | ||
| * `@ignored` tags are necessary for Components-Generator.js | ||
| */ | ||
| raw: Quad[]; | ||
| public constructor(identifier?: NamedNode | BlankNode | string, quads?: Quad[]) { | ||
| this.store = new Store(quads); | ||
| if (identifier) { | ||
| if (typeof identifier === 'string') { | ||
| this.id = namedNode(identifier); | ||
| } else { | ||
| this.id = identifier; | ||
| } | ||
| } else { | ||
| this.id = this.store.createBlankNode(); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Optional metadata profiles. | ||
| * @returns All metadata quads. | ||
| */ | ||
| profiles?: string[]; | ||
| public quads(): Quad[] { | ||
| return this.store.getQuads(null, null, null, null); | ||
| } | ||
|
|
||
| /** | ||
| * Optional size of the representation. | ||
| * Identifier of the resource this metadata is relevant to. | ||
| * Will update all relevant triples if this value gets changed. | ||
| */ | ||
| byteSize?: number; | ||
| public get identifier(): NamedNode | BlankNode { | ||
| return this.id; | ||
| } | ||
|
|
||
| public set identifier(id: NamedNode | BlankNode) { | ||
| const quads = this.quads().map((quad): Quad => { | ||
| if (quad.subject.equals(this.id)) { | ||
| return createQuad(id, quad.predicate, quad.object, quad.graph); | ||
| } | ||
| if (quad.object.equals(this.id)) { | ||
| return createQuad(quad.subject, quad.predicate, id, quad.graph); | ||
| } | ||
| return quad; | ||
| }); | ||
| this.store = new Store(quads); | ||
| this.id = id; | ||
| } | ||
|
|
||
| /** | ||
| * Optional content type of the representation. | ||
| * @param quads - Quads to add to the metadata. | ||
| */ | ||
| contentType?: string; | ||
| public addQuads(quads: Quad[]): void { | ||
| this.store.addQuads(quads); | ||
| } | ||
|
|
||
| /** | ||
| * Optional encoding of the representation. | ||
| * @param quads - Quads to remove from the metadata. | ||
| */ | ||
| encoding?: string; | ||
| public removeQuads(quads: Quad[]): void { | ||
| this.store.removeQuads(quads); | ||
| } | ||
|
|
||
| /** | ||
| * Optional language of the representation. | ||
| * Adds a value linked to the identifier. Strings get converted to literals. | ||
| * @param predicate - Predicate linking identifier to value. | ||
| * @param object - Value to add. | ||
| */ | ||
| language?: string; | ||
| public add(predicate: NamedNode, object: NamedNode | Literal | string): void { | ||
| this.store.addQuad(this.id, predicate, typeof object === 'string' ? literal(object) : object); | ||
| } | ||
|
|
||
| /** | ||
| * Optional timestamp of the representation. | ||
| * Removes the given value from the metadata. Strings get converted to literals. | ||
| * @param predicate - Predicate linking identifier to value. | ||
| * @param object - Value to remove. | ||
| */ | ||
| dateTime?: Date; | ||
| public remove(predicate: NamedNode, object: NamedNode | Literal | string): void { | ||
| this.store.removeQuad(this.id, predicate, typeof object === 'string' ? literal(object) : object); | ||
| } | ||
|
|
||
| /** | ||
| * Optional link relationships of the representation. | ||
| * Removes all values linked through the given predicate. | ||
| * @param predicate - Predicate to remove. | ||
| */ | ||
| linkRel?: { [id: string]: Set<string> }; | ||
| public removeAll(predicate: NamedNode): void { | ||
| this.removeQuads(this.store.getQuads(this.id, predicate, null, null)); | ||
| } | ||
|
|
||
| /** | ||
| * @param predicate - Predicate to get the value for. | ||
| * | ||
| * @throws Error | ||
| * If there are multiple matching values. | ||
| * | ||
| * @returns The corresponding value. Undefined if there is no match | ||
| */ | ||
| public get(predicate: NamedNode): Term | undefined { | ||
| const quads = this.store.getQuads(this.id, predicate, null, null); | ||
| if (quads.length === 0) { | ||
| return; | ||
| } | ||
| if (quads.length > 1) { | ||
| throw new Error(`Multiple results for ${predicate.value}`); | ||
| } | ||
| return quads[0].object; | ||
| } | ||
|
|
||
| /** | ||
| * Optional slug of the representation. | ||
| * Used to suggest the URI for the resource created. | ||
| * Sets the value for the given predicate, removing all other instances. | ||
| * @param predicate - Predicate linking to the value. | ||
| * @param object - Value to set. | ||
| */ | ||
| slug?: string; | ||
| public set(predicate: NamedNode, object: NamedNode | Literal | string): void { | ||
| this.removeAll(predicate); | ||
| this.add(predicate, object); | ||
| } | ||
| } |
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