all files / firebase/modules/firestore/ QuerySnapshot.js

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/**
 * @flow
 * QuerySnapshot representation wrapper
 */
import DocumentChange from './DocumentChange';
import DocumentSnapshot from './DocumentSnapshot';
 
import type Firestore from './';
import type {
  NativeDocumentChange,
  NativeDocumentSnapshot,
  SnapshotMetadata,
} from './types';
import type Query from './Query';
 
type NativeQuerySnapshot = {
  changes: NativeDocumentChange[],
  documents: NativeDocumentSnapshot[],
  metadata: SnapshotMetadata,
};
 
/**
 * @class QuerySnapshot
 */
export default class QuerySnapshot {
  _changes: DocumentChange[];
  _docs: DocumentSnapshot[];
  _metadata: SnapshotMetadata;
  _query: Query;
 
  constructor(
    firestore: Firestore,
    query: Query,
    nativeData: NativeQuerySnapshot
  ) {
    this._changes = nativeData.changes.map(
      change => new DocumentChange(firestore, change)
    );
    this._docs = nativeData.documents.map(
      doc => new DocumentSnapshot(firestore, doc)
    );
    this._metadata = nativeData.metadata;
    this._query = query;
  }
 
  get docChanges(): DocumentChange[] {
    return this._changes;
  }
 
  get docs(): DocumentSnapshot[] {
    return this._docs;
  }
 
  get empty(): boolean {
    return this._docs.length === 0;
  }
 
  get metadata(): SnapshotMetadata {
    return this._metadata;
  }
 
  get query(): Query {
    return this._query;
  }
 
  get size(): number {
    return this._docs.length;
  }
 
  forEach(callback: DocumentSnapshot => any) {
    // TODO: Validation
    // validate.isFunction('callback', callback);
 
    this._docs.forEach(doc => {
      callback(doc);
    });
  }
}