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import { TraceSource } from "../log/TraceSource";
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import { argumentNotNull, argumentNotEmptyString, isPrimitive, each, isNull } from "../safe";
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import { Descriptor, ServiceMap, isDescriptor } from "./interfaces";
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import { Container } from "./Container";
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const trace = TraceSource.get("@implab/core/di/ActivationContext");
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export interface ActivationContextInfo {
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name: string;
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service: Descriptor;
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scope: ServiceMap;
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}
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export class ActivationContext {
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_cache: object;
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_services: ServiceMap;
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_stack: ActivationContextInfo[];
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_visited: object;
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container: Container;
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constructor(container: Container, services: ServiceMap, cache?: object, visited?) {
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argumentNotNull(container, "container");
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argumentNotNull(services, "services");
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this._visited = visited || {};
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this._stack = [];
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this._cache = cache || {};
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this._services = services;
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this.container = container;
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}
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getService(name, def?): any {
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const d = this._services[name];
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if (!d)
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if (arguments.length > 1)
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return def;
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else
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throw new Error(`Service ${name} not found`);
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return isDescriptor(d) ? d.activate(this, name) : d;
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}
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/**
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* registers services local to the the activation context
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*
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* @name{string} the name of the service
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* @service{string} the service descriptor to register
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*/
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register(name: string, service: Descriptor) {
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argumentNotEmptyString(name, "name");
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this._services[name] = service;
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}
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clone() {
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return new ActivationContext(
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this.container,
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Object.create(this._services),
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this._cache,
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this._visited
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);
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}
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has(id: string) {
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return id in this._cache;
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}
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get(id: string) {
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return this._cache[id];
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}
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store(id: string, value) {
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return (this._cache[id] = value);
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}
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parse(data, name: string) {
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if (isPrimitive(data))
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return data;
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if (isDescriptor(data)) {
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return data.activate(this, name);
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} else if (data instanceof Array) {
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this.enter(name);
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const v = data.map( (x, i) => this.parse(x, `[${i}]`));
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this.leave();
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return v;
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} else {
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this.enter(name);
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const result = {};
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for (const p in data)
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result[p] = this.parse(data[p], "." + p);
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this.leave();
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return result;
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}
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}
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visit(id: string) {
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const count = this._visited[id] || 0;
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this._visited[id] = count + 1;
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return count;
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}
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getStack() {
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return this._stack.slice().reverse();
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}
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enter(name: string, d?: Descriptor, localize?: boolean) {
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if (trace.isLogEnabled())
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trace.log("enter " + name + " " + (d || "") +
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(localize ? " localize" : ""));
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this._stack.push({
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name,
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service: d,
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scope: this._services
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});
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if (localize)
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this._services = Object.create(this._services);
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}
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leave() {
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const ctx = this._stack.pop();
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this._services = ctx.scope;
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if (trace.isLogEnabled())
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trace.log("leave " + ctx.name + " " + (ctx.service || ""));
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}
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}
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