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const _ = require('deepdash')(require('lodash')); |
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const check = require('check-types'); |
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const { JgfGraph } = require('./jgfGraph'); |
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4
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const { JgfMultiGraph } = require('./jgfMultiGraph'); |
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6
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/** |
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7
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* Transforms graphs or multigraphs to json or vice versa. |
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* |
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9
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* Note that this is just called decorator for semantic reasons and does not follow the GoF decorator design pattern. |
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*/ |
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class JgfJsonDecorator { |
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// static fromJson(json) { |
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// // todo: return graph or multigraph depending on data |
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// } |
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static _guardAgainstInvalidGraphObject(graph) { |
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if (!check.instance(graph, JgfGraph) && !check.instance(graph, JgfMultiGraph)) { |
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throw new Error('JgfJsonDecorator can only decorate graphs or multigraphs.'); |
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} |
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} |
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// todo: add doc block |
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// todo: check if just retunrning a multigraph for a single one makes sense according to spec |
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static toJson(graph) { |
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this._guardAgainstInvalidGraphObject(graph); |
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let normalizedGraph = this._normalizeToMultiGraph(graph); |
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let allGraphsJson = []; |
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_.each(normalizedGraph.graphs, (singleGraph) => { |
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let singleGraphJson = { |
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type: singleGraph.type, |
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label: singleGraph.label, |
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directed: singleGraph.directed, |
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metadata: singleGraph.metadata, |
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nodes: [], |
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edges: [], |
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}; |
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this._nodesToJson(singleGraph, singleGraphJson); |
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this._edgesToJson(singleGraph, singleGraphJson); |
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allGraphsJson.push(singleGraphJson); |
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}); |
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48
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return this._removeNullValues(allGraphsJson); |
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} |
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51
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static _removeNullValues(json) { |
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return _.filterDeep(json, (value) => value !== null); |
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} |
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/** |
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* @param {JgfGraph} graph |
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* @param {object} json |
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*/ |
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static _edgesToJson(graph, json) { |
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_.each(graph.edges, (edge) => { |
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json.edges.push({ |
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source: edge.source, |
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target: edge.target, |
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relation: edge.relation, |
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label: edge.label, |
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metadata: edge.metadata, |
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directed: edge.directed, |
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}); |
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}); |
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} |
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72
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/** |
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* @param {JgfGraph} graph |
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* @param {object} json |
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*/ |
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static _nodesToJson(graph, json) { |
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_.each(graph.nodes, (node) => { |
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json.nodes.push({ |
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id: node.id, |
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label: node.label, |
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metadata: node.metadata, |
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}); |
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}); |
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84
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} |
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85
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86
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static _normalizeToMultiGraph(graph) { |
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87
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let normalizedGraph = graph; |
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if (check.instance(graph, JgfGraph)) { |
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normalizedGraph = new JgfMultiGraph(); |
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normalizedGraph.addGraph(graph); |
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} |
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92
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93
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return normalizedGraph; |
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94
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} |
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} |
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96
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97
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module.exports = { |
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98
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JgfJsonDecorator, |
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}; |
ArSn /
jay-gee-eff-for-web
