@comunica/actor-query-process-sequential
Version:
A sequential query-process actor
77 lines • 4.04 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ActorQueryProcessSequential = void 0;
const bus_query_process_1 = require("@comunica/bus-query-process");
const context_entries_1 = require("@comunica/context-entries");
const core_1 = require("@comunica/core");
const utils_bindings_factory_1 = require("@comunica/utils-bindings-factory");
const utils_query_operation_1 = require("@comunica/utils-query-operation");
const sparqlalgebrajs_1 = require("sparqlalgebrajs");
/**
* A comunica Sequential Query Process Actor.
*/
class ActorQueryProcessSequential extends bus_query_process_1.ActorQueryProcess {
constructor(args) {
super(args);
}
async test(action) {
if (action.context.get(context_entries_1.KeysInitQuery.explain) ?? action.context.get(new core_1.ActionContextKey('explain'))) {
return (0, core_1.failTest)(`${this.name} is not able to explain queries.`);
}
return (0, core_1.passTestVoid)();
}
async run(action) {
// Run all query processing steps in sequence
let { operation, context } = await this.parse(action.query, action.context);
({ operation, context } = await this.optimize(operation, context));
const output = await this.evaluate(operation, context);
return { result: output };
}
async parse(query, context) {
// Pre-processing the context
context = (await this.mediatorContextPreprocess.mediate({ context, initialize: true })).context;
// Parse query
let operation;
if (typeof query === 'string') {
// Save the original query string in the context
context = context.set(context_entries_1.KeysInitQuery.queryString, query);
const baseIRI = context.get(context_entries_1.KeysInitQuery.baseIRI);
const queryFormat = context.get(context_entries_1.KeysInitQuery.queryFormat);
const queryParseOutput = await this.mediatorQueryParse.mediate({ context, query, queryFormat, baseIRI });
operation = queryParseOutput.operation;
// Update the baseIRI in the context if the query modified it.
if (queryParseOutput.baseIRI) {
context = context.set(context_entries_1.KeysInitQuery.baseIRI, queryParseOutput.baseIRI);
}
}
else {
operation = query;
}
// Apply initial bindings in context
if (context.has(context_entries_1.KeysInitQuery.initialBindings)) {
const dataFactory = context.getSafe(context_entries_1.KeysInitQuery.dataFactory);
const algebraFactory = new sparqlalgebrajs_1.Factory(dataFactory);
const bindingsFactory = await utils_bindings_factory_1.BindingsFactory
.create(this.mediatorMergeBindingsContext, context, dataFactory);
operation = (0, utils_query_operation_1.materializeOperation)(operation, context.get(context_entries_1.KeysInitQuery.initialBindings), algebraFactory, bindingsFactory);
// Delete the query string from the context, since our initial query might have changed
context = context.delete(context_entries_1.KeysInitQuery.queryString);
}
return { operation, context };
}
async optimize(operation, context) {
// Save initial query in context
context = context.set(context_entries_1.KeysInitQuery.query, operation);
({ operation, context } = await this.mediatorOptimizeQueryOperation.mediate({ context, operation }));
// Save original query in context
context = context.set(context_entries_1.KeysInitQuery.query, operation);
return { operation, context };
}
async evaluate(operation, context) {
const output = await this.mediatorQueryOperation.mediate({ context, operation });
output.context = context;
return output;
}
}
exports.ActorQueryProcessSequential = ActorQueryProcessSequential;
//# sourceMappingURL=ActorQueryProcessSequential.js.map