Mercurial > code > home > repos > streamed-graph
annotate src/layout/ViewConfig.ts @ 122:2e8fa3fec0c8
support joining subjects into wider rows
| author | drewp@bigasterisk.com |
|---|---|
| date | Sun, 20 Mar 2022 14:12:03 -0700 |
| parents | 3cdbbd913f1d |
| children | 5a1a79f54779 |
| rev | line source |
|---|---|
| 102 | 1 // Load requested view (rdf data) and provide access to it |
| 2 import { DataFactory, NamedNode, Store } from "n3"; | |
| 3 import { fetchAndParse, n3Graph } from "./fetchAndParse"; | |
| 4 import { EX, RDF } from "./namespaces"; | |
| 95 | 5 import { labelOrTail, uriValue } from "./rdf_value"; |
| 94 | 6 const Uri = DataFactory.namedNode; |
| 93 | 7 |
| 94 | 8 function firstElem<E>(seq: Iterable<E>): E { |
| 9 for (let e of seq) { | |
| 10 return e; | |
| 11 } | |
| 12 throw new Error("no elems"); | |
| 13 } | |
| 14 | |
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15 export interface Link { |
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16 // If you display a subject u1 with a `pred` edge to u2, then treat u2 as an alias of u1. |
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17 pred: NamedNode; |
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18 } |
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19 |
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20 interface TableDesc { |
| 97 | 21 uri: NamedNode; |
| 22 primary: NamedNode; | |
| 23 joins: NamedNode[]; | |
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24 links: Link[]; |
| 97 | 25 } |
| 26 | |
| 102 | 27 export class ViewConfig { |
| 93 | 28 graph: Store; |
| 94 | 29 viewRoot!: NamedNode; |
| 102 | 30 url?: string; |
| 31 tables: TableDesc[] = []; | |
| 95 | 32 |
| 102 | 33 constructor() { |
| 93 | 34 this.graph = new Store(); |
| 35 } | |
| 95 | 36 |
| 102 | 37 async readFromUrl(url: string | "") { |
| 38 if (!url) { | |
| 39 return; | |
| 40 } | |
| 110 | 41 this.url = url; |
| 102 | 42 await fetchAndParse(url, this.graph); |
| 43 | |
| 44 this._read(); | |
| 94 | 45 } |
| 95 | 46 |
| 102 | 47 async readFromGraph(n3: string) { |
| 48 this.graph = await n3Graph(n3); | |
| 49 this._read(); | |
| 50 } | |
| 51 | |
| 52 _read() { | |
| 53 this.viewRoot = firstElem( | |
| 54 this.graph.getSubjects(RDF("type"), EX("View"), null) | |
| 55 ) as NamedNode; | |
| 94 | 56 for (let table of this.graph.getObjects(this.viewRoot, EX("table"), null)) { |
| 97 | 57 const tableType = uriValue(this.graph, table, EX("primaryType")); |
| 58 const joins: NamedNode[] = []; | |
| 59 for (let joinType of this.graph.getObjects(table, EX("joinType"), null)) { | |
| 60 joins.push(joinType as NamedNode); | |
| 61 } | |
| 62 joins.sort(); | |
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63 |
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64 const links: Link[] = []; |
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parents:
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65 for (let linkDesc of this.graph.getObjects(table, EX("link"), null)) { |
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66 links.push({ |
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67 pred: uriValue(this.graph, linkDesc, EX("predicate")), |
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68 }); |
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69 } |
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70 |
| 102 | 71 this.tables.push({ |
| 72 uri: table as NamedNode, | |
| 73 primary: tableType, | |
| 74 joins: joins, | |
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2e8fa3fec0c8
support joining subjects into wider rows
drewp@bigasterisk.com
parents:
110
diff
changeset
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75 links: links, |
| 102 | 76 }); |
| 94 | 77 } |
| 102 | 78 this.tables.sort(); |
| 79 } | |
| 80 | |
| 81 label(): string { | |
| 82 return this.url !== undefined | |
| 83 ? labelOrTail(this.graph, Uri(this.url)) | |
| 84 : "unnamed"; | |
| 93 | 85 } |
| 86 } |