Mercurial > code > home > repos > streamed-graph
annotate src/graph_queries.ts @ 55:2936477ba3dd
dispatch graph-changed event. experimental.
| author | drewp@bigasterisk.com |
|---|---|
| date | Mon, 13 Jan 2020 00:07:28 -0800 |
| parents | 601a604c097a |
| children | 0c188ed3bcd8 |
| rev | line source |
|---|---|
| 53 | 1 import { N3Store, NamedNode } from "n3"; |
| 2 | |
| 3 export function getStringValue( | |
| 4 store: N3Store | undefined, | |
| 5 subj: NamedNode, | |
| 6 pred: NamedNode, | |
| 7 defaultValue: string = "" | |
| 8 ): string { | |
| 9 if (store === undefined) { | |
| 10 // this is so you can use the function before you have a graph | |
| 11 return "..."; | |
| 12 } | |
| 13 const objs = store.getObjects(subj, pred, null); | |
| 14 if (objs.length == 0) { | |
| 15 return defaultValue; | |
| 16 } | |
| 17 return objs[0].value; | |
| 18 } |