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import { Loader } from '../loader/loader';
import { IDictionary } from '../utils/interfaces';
import { Accessor } from './accessors';
import { IAccessorManager } from './interfaces';
export class AccessorManager implements IAccessorManager {
private accessors: { [key: string]: { instance: any; accessor: string } } = {};
private props: IDictionary = {};
hasAccessor(name: string): boolean {
return !!this.accessors[name];
}
addProp(name: string, value: any) {
if (Accessor.isAccessorDefinition(value)) {
this.props[name] = value;
}
}
/**
* Creates all accessors based on props value.
*/
createAccessors(obj: any, props: IDictionary = this.props): void {
// TODO: re-factory this forEach for better performance
Object.keys(props).forEach((name) => this.createAccessor(name, obj, props));
this.props = {};
}
/**
* Creates a new accessor.
* @param name Accessor name
*/
private createAccessor(name: string, obj: any, props: IDictionary) {
const [controller, accessor] = Accessor.getAccessor(props[name]);
const instance = Loader.getInstance(controller);
if (instance) {
this.accessors[name] = { accessor, instance };
this.defineAccessor(name, obj);
}
}
/**
* Replaces instance property to accessor reference.
* @param name Accessor name. It can also be the path to a property, separated by `.`
*/
private defineAccessor(name: string, mainObj: any) {
const split = name.split('.');
const propName = split.pop() as string;
const path = split.join('.');
const { instance, accessor } = this.accessors[name];
const obj = path ? get(mainObj, path) : mainObj;
let objProto = obj;
let objDescriptor;
do {
objDescriptor = this.getDescriptor(objProto, name);
objProto = Object.getPrototypeOf(objProto);
} while (objProto && !objDescriptor);
if (objDescriptor?.set && objDescriptor.get) {
const ctrlProtoDescriptor = this.getProtoDescriptor(instance, accessor);
const objGetFunction = objDescriptor.get.bind(obj);
const objSetFunction = objDescriptor.set.bind(obj);
let ctrlGetFunction: any;
if (!ctrlProtoDescriptor || ctrlProtoDescriptor.get) {
ctrlGetFunction = () => instance[accessor];
}
const ctrlSetFunction: any = (value: any) => {
instance[accessor] = value;
};
let prevGet: any;
const getFunction = () => {
let value: any;
if (!ctrlGetFunction) {
value = objGetFunction();
} else {
const ctrlVal = ctrlGetFunction();
const objVal = objGetFunction();
// if the values are different, returns the value that is different from the previously returned value
if (ctrlVal !== objVal) {
if (ctrlSetFunction && ctrlVal === prevGet) {
ctrlSetFunction(objVal);
} else {
objSetFunction(ctrlVal);
}
}
value = ctrlGetFunction();
}
prevGet = value;
return value;
};
const setFunction = (value: any) => {
let newValue = value;
if (ctrlSetFunction) {
ctrlSetFunction(value);
}
if (ctrlGetFunction) newValue = ctrlGetFunction();
objSetFunction(newValue);
};
objSetFunction.call(obj, instance[accessor]);
Object.defineProperty(obj, propName, {
get: getFunction,
set: setFunction,
enumerable: true,
configurable: true,
});
this.defineNewCtrlDescriptor(instance, accessor, objSetFunction, objGetFunction);
} else {
Object.defineProperty(obj, propName, {
get: () => instance[accessor],
set: (value: any) => {
instance[accessor] = value;
},
enumerable: true,
configurable: true,
});
}
}
private defineNewCtrlDescriptor(
instance: any,
accessor: string,
objSetFunction: (value: any) => void,
objGetFunction: () => any,
) {
const ctrlProtoDescriptor = this.getProtoDescriptor(instance, accessor);
// basic getter/setter for the controller property (in case it doesnt have getter/setter)
let accessorValue = instance[accessor];
const basicCtrlGetFunction = () => accessorValue;
const basicCtrlSetFunction = (newValue: any) => {
accessorValue = newValue;
};
const ctrlDescriptor = this.getDescriptor(instance, accessor) || ctrlProtoDescriptor;
const newCtrlDescriptor: PropertyDescriptor = {
enumerable: true,
configurable: true,
};
const prevCtrlSet = ctrlDescriptor?.set?.bind(instance) ?? basicCtrlSetFunction.bind(instance);
// this setter will call the setter of each object that uses this accessor
const newCtrlSetFunction = (value: any) => {
if (value !== objGetFunction()) objSetFunction(value);
if (prevCtrlSet) prevCtrlSet(value);
};
newCtrlDescriptor.set = newCtrlSetFunction.bind(instance);
if (!ctrlProtoDescriptor || ctrlProtoDescriptor.get) {
newCtrlDescriptor.get = ctrlDescriptor?.get?.bind(instance) ?? basicCtrlGetFunction.bind(instance);
}
Object.defineProperty(instance, accessor, newCtrlDescriptor);
}
private getProtoDescriptor(instance: any, accessor: string) {
return this.getDescriptor(Object.getPrototypeOf(instance), accessor);
}
private getDescriptor(instance: any, accessor: string) {
return Object.getOwnPropertyDescriptor(instance, accessor);
}
}
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