/**
 * 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 { SnapshotVersion } from '../core/snapshot_version';
import { ListenSequenceNumber, ProtoByteString, TargetId } from '../core/types';
/** An enumeration of the different purposes we have for queries. */
export declare enum QueryPurpose {
    /** A regular, normal query. */
    Listen = 0,
    /**
     * The query was used to refill a query after an existence filter mismatch.
     */
    ExistenceFilterMismatch = 1,
    /** The query was used to resolve a limbo document. */
    LimboResolution = 2,
}
/**
 * An immutable set of metadata that the local store tracks for each query.
 */
export declare class QueryData {
    /** The query being listened to. */
    readonly query: Query;
    /**
     * The target ID to which the query corresponds; Assigned by the
     * LocalStore for user listens and by the SyncEngine for limbo watches.
     */
    readonly targetId: TargetId;
    /** The purpose of the query. */
    readonly purpose: QueryPurpose;
    /** The sequence number of the last transaction during which this query data was modified */
    readonly sequenceNumber: ListenSequenceNumber;
    /** The latest snapshot version seen for this target. */
    readonly snapshotVersion: SnapshotVersion;
    /**
     * An opaque, server-assigned token that allows watching a query to be
     * resumed after disconnecting without retransmitting all the data that
     * matches the query. The resume token essentially identifies a point in
     * time from which the server should resume sending results.
     */
    readonly resumeToken: ProtoByteString;
    constructor(
        /** The query being listened to. */
        query: Query, 
        /**
         * The target ID to which the query corresponds; Assigned by the
         * LocalStore for user listens and by the SyncEngine for limbo watches.
         */
        targetId: TargetId, 
        /** The purpose of the query. */
        purpose: QueryPurpose, 
        /** The sequence number of the last transaction during which this query data was modified */
        sequenceNumber: ListenSequenceNumber, 
        /** The latest snapshot version seen for this target. */
        snapshotVersion?: SnapshotVersion, 
        /**
         * An opaque, server-assigned token that allows watching a query to be
         * resumed after disconnecting without retransmitting all the data that
         * matches the query. The resume token essentially identifies a point in
         * time from which the server should resume sending results.
         */
        resumeToken?: ProtoByteString);
    /**
     * Creates a new query data instance with an updated snapshot version and
     * resume token.
     */
    copy(overwrite: {
        resumeToken?: ProtoByteString;
        snapshotVersion?: SnapshotVersion;
        sequenceNumber?: ListenSequenceNumber;
    }): QueryData;
    isEqual(other: QueryData): boolean;
}