# All files / model collections.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 { SnapshotVersion } from '../core/snapshot_version';
    import { SortedMap } from '../util/sorted_map';
    import { SortedSet } from '../util/sorted_set';

    import { Document, MaybeDocument } from './document';
    import { DocumentKey } from './document_key';

    /** Miscellaneous collection types / constants. */

    export type MaybeDocumentMap = SortedMap<DocumentKey, MaybeDocument>;
    const EMPTY_MAYBE_DOCUMENT_MAP = new SortedMap<DocumentKey, MaybeDocument>(
      DocumentKey.comparator
    );
    export function maybeDocumentMap() {
      return EMPTY_MAYBE_DOCUMENT_MAP;
    }

    export type DocumentMap = SortedMap<DocumentKey, Document>;
    const EMPTY_DOCUMENT_MAP = new SortedMap<DocumentKey, Document>(
      DocumentKey.comparator
    );
    export function documentMap() {
      return EMPTY_DOCUMENT_MAP;
    }

    export type DocumentVersionMap = SortedMap<DocumentKey, SnapshotVersion>;
    const EMPTY_DOCUMENT_VERSION_MAP = new SortedMap<DocumentKey, SnapshotVersion>(
      DocumentKey.comparator
    );
    export function documentVersionMap() {
      return EMPTY_DOCUMENT_VERSION_MAP;
    }

    export type DocumentKeySet = SortedSet<DocumentKey>;
    const EMPTY_DOCUMENT_KEY_SET = new SortedSet(DocumentKey.comparator);
    export function documentKeySet() {
      return EMPTY_DOCUMENT_KEY_SET;
    }