Differential D213 Diff 797 lib/datastore/query_and.js

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lib/datastore/query_and.js

This file was added.

				const Query = require("./query.js");
				const QueryStep = require("./query-step.js");
				const Graph = require("./graph.js");

				module.exports = class extends Query {
				constructor(...queries) {
				super();
				this._reset();
				for (let query of queries) {
				this.addQuery(query);
				}
				}
				_reset() {
				this.graph = new Graph();
				this.aggregation_steps = {};
				kuba-orlikUnsubmitted Done Inline Actions (could) można by dodać optymalizację, w której jeżeli którykolwiek element to "deny all", to wszystkie inne matche są wywalane i dalej nieprzyjmowane, a deny all jest pierwszym elementem w pipeline kuba-orlik: (could) można by dodać optymalizację, w której jeżeli którykolwiek element to "deny all", to…
				this.received_deny_all = false;
				}
				addQuery(query) {
				if (this.received_deny_all) {
				return;
				}
				if (query instanceof Query.DenyAll) {
				this._reset();
				this.received_deny_all = true;
				}
				const steps = query.dump();
				for (let step of steps) {
				const id = step.hash();
				if (this._isInGraph(id)) {
				continue;
				}

				this._addToAggregationSteps(id, step);
				this._addDependenciesInGraph(id, step);
				}
				}
				_isInGraph(key) {
				return key.length === 32 && this.graph.node_ids.includes(key);
				}
				_addToAggregationSteps(id, step) {
				this.graph.addNode(id, step.getCost());
				this.aggregation_steps[id] = step;
				}
				_addDependenciesInGraph(id, step) {
				let dependencies = step
				.getUsedFields()
				.filter(field => this._isInGraph(field));

				if (step instanceof QueryStep.Match) {
				dependencies = dependencies.filter(d1 =>
				this._isNotDependencyForAnyInGroup(d1, dependencies)
				);
				}

				for (let dependency of dependencies) {
				this.graph.addEdge(dependency, id);
				}
				}
				_isNotDependencyForAnyInGroup(id, nodeGroup) {
				return !nodeGroup.some(
				node => id !== node && this.graph.pathExists(id, node)
				);
				}
				toPipeline() {
				const sortedStepIds = this.graph.bestFirstSearch();
				return sortedStepIds.reduce((pipeline, id) => {
				if (Array.isArray(this.aggregation_steps[id])) {
				for (let step of this.aggregation_steps[id]) {
				step.pushStage(pipeline);
				}
				return pipeline;
				}
				return this.aggregation_steps[id].pushStage(pipeline);
				}, []);
				}
				};