angular2
Version:
Angular 2 - a web framework for modern web apps
40 lines • 5.4 kB
JavaScript
import { isPresent } from 'angular2/src/facade/lang';
import { BaseException } from 'angular2/src/facade/exceptions';
import { MapWrapper } from 'angular2/src/facade/collection';
export class Locals {
constructor(parent, current) {
this.parent = parent;
this.current = current;
}
contains(name) {
if (this.current.has(name)) {
return true;
}
if (isPresent(this.parent)) {
return this.parent.contains(name);
}
return false;
}
get(name) {
if (this.current.has(name)) {
return this.current.get(name);
}
if (isPresent(this.parent)) {
return this.parent.get(name);
}
throw new BaseException(`Cannot find '${name}'`);
}
set(name, value) {
// TODO(rado): consider removing this check if we can guarantee this is not
// exposed to the public API.
// TODO: vsavkin maybe it should check only the local map
if (this.current.has(name)) {
this.current.set(name, value);
}
else {
throw new BaseException(`Setting of new keys post-construction is not supported. Key: ${name}.`);
}
}
clearLocalValues() { MapWrapper.clearValues(this.current); }
}
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