PathStageBuilder | sparql-engine

The base class to implements to evaluate Property Paths. A subclass of this class only has to implement the _executePropertyPath method to provide an execution logic for property paths.

abstract
author: Thomas Minier

Hierarchy

StageBuilder
- PathStageBuilder
  - GlushkovStageBuilder

Index

Constructors

constructor

Properties

Accessors

Methods

Constructors

constructor

new PathStageBuilder(_dataset: Dataset): PathStageBuilder

Inherited from StageBuilder.constructor
- Defined in src/engine/stages/stage-builder.ts:39
Parameters
- _dataset: Dataset
Returns PathStageBuilder

Properties

Protected _builder

_builder: PlanBuilder | null = null

Protected _dataset

_dataset: Dataset

Accessors

builder

get builder(): PlanBuilder | null
set builder(builder: PlanBuilder | null): void

Inherited from StageBuilder.builder
- Defined in src/engine/stages/stage-builder.ts:43
Returns PlanBuilder | null
Inherited from StageBuilder.builder
- Defined in src/engine/stages/stage-builder.ts:47
Parameters
- builder: PlanBuilder | null
Returns void

dataset

get dataset(): Dataset
set dataset(dataset: Dataset): void

Inherited from StageBuilder.dataset
- Defined in src/engine/stages/stage-builder.ts:51
Returns Dataset
Inherited from StageBuilder.dataset
- Defined in src/engine/stages/stage-builder.ts:55
Parameters
- dataset: Dataset
Returns void

Methods

_buildIterator

_buildIterator(subject: string, path: PropertyPath, obj: string, context: ExecutionContext): PipelineStage<Bindings>

- Defined in src/engine/stages/path-stage-builder.ts:106
Get a PipelineStage for evaluating the property path.

Parameters
- subject: string
  
  Path subject
- path: PropertyPath
  
  Property path
- obj: string
  
  Path object
- context: ExecutionContext
  
  Execution context
Returns PipelineStage<Bindings>

A PipelineStage which yield set of bindings

Abstract _executePropertyPath

_executePropertyPath(subject: string, path: PropertyPath, obj: string, graph: Graph, context: ExecutionContext): PipelineStage<TripleObject>

- Defined in src/engine/stages/path-stage-builder.ts:135
Execute a property path against a RDF Graph.

Parameters
- subject: string
  
  Path subject
- path: PropertyPath
  
  Property path
- obj: string
  
  Path object
- graph: Graph
  
  RDF graph
- context: ExecutionContext
  
  Execution context
Returns PipelineStage<TripleObject>

A PipelineStage which yield RDF triples matching the property path

_getGraph

_getGraph(iris: string[]): Graph

- Defined in src/engine/stages/path-stage-builder.ts:71
Return the RDF Graph to be used for BGP evaluation.
- If iris is empty, returns the default graph
- If iris has a single entry, returns the corresponding named graph
- Otherwise, returns an UnionGraph based on the provided iris
Parameters
- iris: string[]
  
  List of Graph's iris
Returns Graph

An RDF Graph

execute

execute(source: PipelineStage<Bindings>, triples: PathTripleObject[], context: ExecutionContext): PipelineStage<Bindings>

Overrides StageBuilder.execute
- Defined in src/engine/stages/path-stage-builder.ts:87
Get a PipelineStage for evaluating a succession of property paths, connected by joins.

Parameters
- source: PipelineStage<Bindings>
  
  Input PipelineStage
- triples: PathTripleObject[]
  
  Triple patterns
- context: ExecutionContext
  
  Execution context
Returns PipelineStage<Bindings>

A PipelineStage which yield set of bindings from the pipeline of joins

Hierarchy

Index

Constructors

Properties

Accessors

Methods

Constructors

constructor

Parameters

_dataset: Dataset

Returns PathStageBuilder

Properties

Protected _builder

Protected _dataset

Accessors

builder

Returns PlanBuilder | null

Parameters

builder: PlanBuilder | null

Returns void

dataset

Returns Dataset

Parameters

dataset: Dataset

Returns void

Methods

_buildIterator

Parameters

subject: string

path: PropertyPath

obj: string

context: ExecutionContext

Returns PipelineStage<Bindings>

Abstract _executePropertyPath

Parameters

subject: string

path: PropertyPath

obj: string

graph: Graph

context: ExecutionContext

Returns PipelineStage<TripleObject>

_getGraph

Parameters

iris: string[]

Returns Graph

execute

Parameters

source: PipelineStage<Bindings>

triples: PathTripleObject[]

context: ExecutionContext

Returns PipelineStage<Bindings>