# All files / local memory_remote_document_cache.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 {
      DocumentMap,
      documentMap,
      maybeDocumentMap
    } from '../model/collections';
    import { Document, MaybeDocument } from '../model/document';
    import { DocumentKey } from '../model/document_key';

    import { PersistenceTransaction } from './persistence';
    import { PersistencePromise } from './persistence_promise';
    import { RemoteDocumentCache } from './remote_document_cache';

    export class MemoryRemoteDocumentCache implements RemoteDocumentCache {
      private docs = maybeDocumentMap();

      addEntry(
        transaction: PersistenceTransaction,
        maybeDocument: MaybeDocument
      ): PersistencePromise<void> {
        this.docs = this.docs.insert(maybeDocument.key, maybeDocument);
        return PersistencePromise.resolve();
      }

      removeEntry(
        transaction: PersistenceTransaction,
        documentKey: DocumentKey
      ): PersistencePromise<void> {
        this.docs = this.docs.remove(documentKey);
        return PersistencePromise.resolve();
      }

      getEntry(
        transaction: PersistenceTransaction,
        documentKey: DocumentKey
      ): PersistencePromise<MaybeDocument | null> {
        return PersistencePromise.resolve(this.docs.get(documentKey));
      }

      getDocumentsMatchingQuery(
        transaction: PersistenceTransaction,
        query: Query
      ): PersistencePromise<DocumentMap> {
        let results = documentMap();

        // Documents are ordered by key, so we can use a prefix scan to narrow down
        // the documents we need to match the query against.
        const prefix = new DocumentKey(query.path.child(''));
        const iterator = this.docs.getIteratorFrom(prefix);
        while (iterator.hasNext()) {
          const { key, value: maybeDoc } = iterator.getNext();
          if (!query.path.isPrefixOf(key.path)) {
            break;
          }
          if (maybeDoc instanceof Document && query.matches(maybeDoc)) {
            results = results.insert(maybeDoc.key, maybeDoc);
          }
        }
        return PersistencePromise.resolve(results);
      }
    }