Comunica Default Expression Evaluator Factory Actor

An expression evaluator factory actor that constructs the default expression evaluator.

This module is part of the Comunica framework, and should only be used by developers that want to build their own query engine.

Click here if you just want to query with Comunica.

Install

$ yarn add @comunica/actor-expression-evaluator-factory-default
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Configure

After installing, this package can be added to your engine's configuration as follows:

{
  "@context": [
    ...
    "https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-expression-evaluator-factory-default/^5.0.0/components/context.jsonld"
  ],
  "actors": [
    ...
    {
      "@id": "urn:comunica:default:expression-evaluator-factory/actors#default",
      "@type": "ActorExpressionEvaluatorFactoryDefault",
      "mediatorQueryOperation": { "@id": "urn:comunica:default:query-operation/mediators#main" },
      "mediatorFunctionFactory": { "@id": "urn:comunica:default:function-factory/mediators#main" },
      "mediatorMergeBindingsContext": { "@id": "urn:comunica:default:merge-bindings-context/mediators#main" }
    }
  ]
}
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Config Parameters

• mediatorQueryOperation: A mediator over the query operation bus, required to evaluate EXISTS.
• mediatorFunctionFactory: A mediator over the function factory bus, required to evaluate function expressions.
• mediatorMergeBindingsContext: A mediator over the merge bindings context bus, used to create the bindings that EXISTS is evaluated against.