65 lines
1.5 KiB
JavaScript
65 lines
1.5 KiB
JavaScript
/*
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AdaptableController.js
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AdaptableController is the base class for all controllers
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that support adapter,
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The super class takes care of creating the right instance for the adapter
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based on the parameters passed
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*/
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// _adapter is private, use Symbol
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var _adapter = Symbol();
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export class AdaptableController {
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constructor(adapter) {
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this.adapter = adapter;
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}
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set adapter(adapter) {
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this.validateAdapter(adapter);
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this[_adapter] = adapter;
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}
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get adapter() {
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return this[_adapter];
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}
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expectedAdapterType() {
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throw new Error("Subclasses should implement expectedAdapterType()");
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}
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validateAdapter(adapter) {
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if (!adapter) {
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throw new Error(this.constructor.name+" requires an adapter");
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}
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let Type = this.expectedAdapterType();
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// Allow skipping for testing
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if (!Type) {
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return;
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}
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// Makes sure the prototype matches
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let mismatches = Object.getOwnPropertyNames(Type.prototype).reduce( (obj, key) => {
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const adapterType = typeof adapter[key];
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const expectedType = typeof Type.prototype[key];
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if (adapterType !== expectedType) {
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obj[key] = {
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expected: expectedType,
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actual: adapterType
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}
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}
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return obj;
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}, {});
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if (Object.keys(mismatches).length > 0) {
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console.error(adapter, mismatches);
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throw new Error("Adapter prototype don't match expected prototype");
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}
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}
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}
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export default AdaptableController; |