118 lines
3.0 KiB
TypeScript
118 lines
3.0 KiB
TypeScript
import * as plugins from './smartdata.plugins'
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import { Db } from './smartdata.classes.db'
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import { DbDoc } from './smartdata.classes.dbdoc'
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export interface IFindOptions {
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limit?: number
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}
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export interface IDocValidation<T> {
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(doc: T): boolean
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}
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export function Collection (db: Db) {
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return function (constructor) {
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constructor[ 'dbCollection' ] = new DbCollection(constructor, db)
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}
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}
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export class DbCollection<T> {
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/**
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* the collection that is used, defaults to mongodb collection,
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* can be nedb datastore (sub api of mongodb)
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*/
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collection: plugins.mongodb.Collection
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collectedClass: T & DbDoc<T>
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objectValidation: IDocValidation<T> = null
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name: string
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db: Db
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constructor (collectedClassArg: T & DbDoc<T>, dbArg: Db) {
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// tell the collection where it belongs
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this.collectedClass = collectedClassArg
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this.name = collectedClassArg.name
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this.db = dbArg
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// make sure it actually exists
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this.collection = dbArg.db.collection(this.name)
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// tell the db class about it (important since Db uses different systems under the hood)
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this.db.addCollection(this)
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}
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/**
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* adds a validation function that all newly inserted and updated objects have to pass
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*/
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addDocValidation (funcArg: IDocValidation<T>) {
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this.objectValidation = funcArg
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}
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/**
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* finds an object in the DbCollection
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*/
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find (docMatchArg: T | any, optionsArg?: IFindOptions): Promise<T[]> {
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let done = plugins.smartq.defer<T[]>()
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let findCursor = this.collection.find(docMatchArg)
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if (optionsArg) {
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if (optionsArg.limit) { findCursor = findCursor.limit(1) }
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}
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findCursor.toArray((err, docs) => {
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if (err) {
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done.reject(err)
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throw err
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}
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done.resolve(docs)
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})
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return done.promise
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}
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/**
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* inserts object into the DbCollection
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*/
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insertOne (docArg: T): Promise<void> {
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let done = plugins.smartq.defer<void>()
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this.checkDoc(docArg).then(
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() => {
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this.collection.insertOne(docArg)
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.then(() => { done.resolve() })
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},
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() => {
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done.reject(new Error('one the docs did not pass validation'))
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})
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return done.promise
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}
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/**
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* inserts many objects at once into the DbCollection
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*/
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insertMany (docArrayArg: T[]): Promise<void> {
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let done = plugins.smartq.defer<void>()
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let checkDocPromiseArray: Promise<void>[] = []
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for (let docArg of docArrayArg) {
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checkDocPromiseArray.push(this.checkDoc(docArg))
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}
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Promise.all(checkDocPromiseArray).then(() => {
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this.collection.insertMany(docArrayArg)
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.then(() => { done.resolve() })
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})
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return done.promise
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}
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/**
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* checks a Doc for constraints
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*/
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private checkDoc (docArg: T): Promise<void> {
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let done = plugins.smartq.defer<void>()
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let validationResult = true
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if (this.objectValidation) {
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validationResult = this.objectValidation(docArg)
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}
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if (validationResult) {
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done.resolve()
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} else {
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done.reject('validation of object did not pass')
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}
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return done.promise
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}
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}
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