Class QuerySourceRdfJs

constructor

• new QuerySourceRdfJs(
      source: Source<Quad> | DatasetCore<Quad, Quad>,
      dataFactory: ComunicaDataFactory,
      bindingsFactory: BindingsFactory,
  ): QuerySourceRdfJs

  Parameters

  • source: Source<Quad> | DatasetCore<Quad, Quad>
  • dataFactory: ComunicaDataFactory
  • bindingsFactory: BindingsFactory

  Returns QuerySourceRdfJs

referenceValue

getFilterFactor

• getFilterFactor(): Promise<number>

  Returns Promise<number>

  A value from 0 to 1 indicating to what respect a source type is able to pre-filter the source based on the pattern. 1 indicates that the source can apply the whole pattern, and 0 indicates that the source can not apply the pattern at all (and local filtering must happen). Plain RDF documents for example have a filter factor of 0, while SPARQL endpoints have a filter factor of 1.

getSelectorShape

• getSelectorShape(): Promise<FragmentSelectorShape>

  Get the selector type that is supported by this source.

  Returns Promise<FragmentSelectorShape>

queryBindings

• queryBindings(operation: BaseOperation, context: IActionContext): BindingsStream

  Returns a (possibly lazy) stream that returns all bindings matching the operation.

  Passed operations MUST conform to the query shape exposed by the selector type returned from getSelectorShape. The given operation represents a Linked Data Fragments selector.

  The returned stream MUST expose the property 'metadata' of type MetadataBindings. The implementor is reponsible for handling cases where 'metadata' is being called without the stream being in flow-mode. This metadata object can become invalidated (see metadata.state), in which case the 'metadata' property must and will be updated.

  Parameters

  • operation: BaseOperation

    The query operation to execute.

  • context: IActionContext

    The query context.

  Returns BindingsStream

  The resulting bindings stream.

  See

  https://linkeddatafragments.org/specification/linked-data-fragments/#selectors

queryBoolean

• queryBoolean(_operation: Ask, _context: IActionContext): Promise<boolean>

  Returns a promise resolving to the ask response of the given operation.

  This method should only be supported if the selector type returned from getSelectorShape supports ask queries.

  Parameters

  • _operation: Ask
  • _context: IActionContext

  Returns Promise<boolean>

  The resulting ask reply.

queryQuads

• queryQuads(
      operation: BaseOperation,
      _context: IActionContext,
  ): AsyncIterator<Quad>

  Returns a (possibly lazy) stream that returns all quads matching the operation.

  This method should only be supported if the selector type returned from getSelectorShape supports construct queries.

  Parameters

  • operation: BaseOperation

    The query operation to execute.

  • _context: IActionContext

  Returns AsyncIterator<Quad>

  The resulting quads stream.

queryVoid

• queryVoid(_operation: BaseOperation, _context: IActionContext): Promise<void>

  Returns a promise resolving when the given update operation succeeds.

  This method should only be supported if the selector type returned from getSelectorShape supports update queries.

  Parameters

  • _operation: BaseOperation
  • _context: IActionContext

  Returns Promise<void>

  The void response.

toString

• toString(): string

  Returns a string representation of this source.

  Returns string

StatichasDuplicateVariables

• hasDuplicateVariables(pattern: BaseQuad): boolean

  Parameters

  • pattern: BaseQuad

  Returns boolean

StaticnullifyVariables

• nullifyVariables(
      term: Term | undefined,
      quotedTripleFiltering: boolean,
  ): Term | undefined

  Parameters

  • term: Term | undefined
  • quotedTripleFiltering: boolean

  Returns Term | undefined