@comunica/actor-optimize-query-operation-join-bgp/lib/ActorOptimizeQueryOperationJoinBgp.js

A join-bgp optimize-query-operation actor

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ActorOptimizeQueryOperationJoinBgp = void 0;
const bus_optimize_query_operation_1 = require("@comunica/bus-optimize-query-operation");
const context_entries_1 = require("@comunica/context-entries");
const core_1 = require("@comunica/core");
const utils_algebra_1 = require("@comunica/utils-algebra");
/**
 * A comunica Join BGP Optimize Query Operation Actor.
 */
class ActorOptimizeQueryOperationJoinBgp extends bus_optimize_query_operation_1.ActorOptimizeQueryOperation {
    async test(_action) {
        return (0, core_1.passTestVoid)();
    }
    async run(action) {
        const dataFactory = action.context.getSafe(context_entries_1.KeysInitQuery.dataFactory);
        const algebraFactory = new utils_algebra_1.AlgebraFactory(dataFactory);
        const operation = utils_algebra_1.algebraUtils.mapOperation(action.operation, {
            [utils_algebra_1.Algebra.Types.JOIN]: {
                preVisitor: () => ({ continue: false }),
                transform: (op) => {
                    if (op.input.every(subInput => subInput.type === 'bgp')) {
                        return algebraFactory.createBgp(op.input.flatMap(subInput => subInput.patterns));
                    }
                    return op;
                },
            },
        });
        return { operation, context: action.context };
    }
}
exports.ActorOptimizeQueryOperationJoinBgp = ActorOptimizeQueryOperationJoinBgp;
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