All files / local local_view_changes.ts

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/**
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
import { Query } from '../core/query';
import { ChangeType, ViewSnapshot } from '../core/view_snapshot';
import { documentKeySet, DocumentKeySet } from '../model/collections';
 
/**
 * A set of changes to what documents are currently in view and out of view for
 * a given query. These changes are sent to the LocalStore by the View (via
 * the SyncEngine) and are used to pin / unpin documents as appropriate.
 */
export class LocalViewChanges {
  constructor(
    readonly query: Query,
    readonly addedKeys: DocumentKeySet,
    readonly removedKeys: DocumentKeySet
  ) {}
 
  static fromSnapshot(viewSnapshot: ViewSnapshot): LocalViewChanges {
    let addedKeys = documentKeySet();
    let removedKeys = documentKeySet();
 
    for (const docChange of viewSnapshot.docChanges) {
      switch (docChange.type) {
        case ChangeType.Added:
          addedKeys = addedKeys.add(docChange.doc.key);
          break;
        case ChangeType.Removed:
          removedKeys = removedKeys.add(docChange.doc.key);
          break;
        default:
        // do nothing
      }
    }
 
    return new LocalViewChanges(viewSnapshot.query, addedKeys, removedKeys);
  }
}