ngx-decorate/_bundle/esm2015/lib/HookManager.js

Useful decorators for Angular 2 and above

import { defineImmutable } from './defineProp';
import { toAbridged } from './Lifecycle';
import { _hookMgr } from './symbols';
/** @internal */
function ngOnDestroy() {
    //mock
}
/** @internal */
function ngOnInit() {
    // mock
}
/** @internal */
export class HookManager {
    constructor(proto) {
        this.proto = proto;
        this.postDestroys = new Set();
        this.postInits = new Set();
        this.preDestroys = new Set();
        this.preInits = new Set();
        this.origInit = proto.ngOnInit || ngOnInit;
        this.origDestroy = proto.ngOnDestroy || ngOnDestroy;
    }
    get newDestroy() {
        const value = this.newFn(this.preDestroys, this.postDestroys, this.origDestroy);
        defineImmutable(this, 'newDestroy', value);
        return value;
    }
    get newInit() {
        const value = this.newFn(this.preInits, this.postInits, this.origInit);
        defineImmutable(this, 'newInit', value);
        return value;
    }
    static for(proto) {
        if (!proto[_hookMgr]) {
            defineImmutable(proto, _hookMgr, new HookManager(proto));
        }
        return proto[_hookMgr];
    }
    add(lifecycle, hookFn) {
        this.hooks(lifecycle).add(hookFn);
        const type = toAbridged(lifecycle);
        if (type === 1 /* DESTROY */) {
            this.proto.ngOnDestroy = this.preDestroys.size || this.postDestroys.size ? this.newDestroy : this.origDestroy;
        }
        else {
            this.proto.ngOnInit = this.preInits.size || this.postInits.size ? this.newInit : this.origInit;
        }
    }
    hooks(lifecycle) {
        switch (lifecycle) {
            case 0 /* PRE_INIT */:
                return this.preInits;
            case 1 /* PRE_DESTROY */:
                return this.preDestroys;
            case 2 /* POST_INIT */:
                return this.postInits;
            default:
                return this.postDestroys;
        }
    }
    newFn(pres, posts, orig) {
        return function () {
            try {
                for (const fn of pres) {
                    fn(this);
                }
                orig.apply(this, arguments);
            }
            finally {
                for (const fn of posts) {
                    fn(this);
                }
            }
        };
    }
}
defineImmutable(HookManager.prototype, Symbol.toStringTag, 'HookManager');
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