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93
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1 // Load requested view and provide access to it
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95
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2 import { Store, NamedNode, DataFactory } from "n3";
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3 import { fetchAndParse } from "./fetchAndParse";
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4 import { RDF, EX } from "./namespaces";
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5 import { labelOrTail, uriValue } from "./rdf_value";
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94
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6 const Uri = DataFactory.namedNode;
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93
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7
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94
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8 function firstElem<E>(seq: Iterable<E>): E {
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9 for (let e of seq) {
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10 return e;
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11 }
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12 throw new Error("no elems");
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13 }
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14
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97
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15 export interface TableDesc {
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16 uri: NamedNode;
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17 primary: NamedNode;
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18 joins: NamedNode[];
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19 }
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20
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21
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93
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22 export class View {
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23 graph: Store;
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24 ready: Promise<null>;
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94
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25 viewRoot!: NamedNode;
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95
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26
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93
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27 constructor(public url: string | "") {
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94
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28 (window as any).v = this; //debug
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93
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29 this.graph = new Store();
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30 this.ready = new Promise((res, rej) => {
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31 if (url) {
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32 fetchAndParse(url).then((s2) => {
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33 this.graph = s2;
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34 res(null);
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35 });
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36 } else {
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37 res(null);
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38 }
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39 });
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94
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40 this.ready.then(() => {
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41 this.viewRoot = firstElem(
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42 this.graph.getSubjects(RDF("type"), EX("View"), null)
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43 ) as NamedNode;
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44 });
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93
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45 }
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95
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46
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93
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47 label() {
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94
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48 return labelOrTail(this.graph, Uri(this.url));
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49 }
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95
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50
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94
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51 // filtered+ordered list of types to show at the top level
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97
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52 toplevelTables(typesPresent: NamedNode[]): TableDesc[] {
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53 const ret: TableDesc[] = [];
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94
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54 for (let table of this.graph.getObjects(this.viewRoot, EX("table"), null)) {
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97
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55 const tableType = uriValue(this.graph, table, EX("primaryType"));
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56 const joins: NamedNode[] = [];
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57 for (let joinType of this.graph.getObjects(table, EX("joinType"), null)) {
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58 joins.push(joinType as NamedNode);
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59 }
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60 joins.sort();
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61 ret.push({ uri: table as NamedNode, primary: tableType, joins: joins });
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94
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62 }
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63 ret.sort();
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64 return ret;
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93
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65 }
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66 }
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