import { IStorage } from './storage.interface';
import { IPersistenceContainer } from '../../abstracts/persistence.container';
/**
 * This is an internal implementation of a storage container.  It takes a PersistenceContainer
 * (which has a subset of the functionality) and straps on an info object to keep track of
 * items that are added to the container.  This class can be used for creating storage
 * containers within other storage containers.
 *
 * @export
 * @class PersistenceContainerImpl
 * @implements {IPersistenceContainer}
 *
 * @author Scott O'Bryan
 * @since 1.0
 */
export declare class SubStorage implements IStorage {
    private _namespace;
    private _root;
    private _available;
    private _info;
    /**
     * Creates an instance of SubStorage.
     * @param {string} _namespace
     * @param {IPersistenceContainer} _root
     * @param {boolean} [_available=true]
     */
    constructor(_namespace: string, _root: IPersistenceContainer, _available?: boolean);
    /**
     * Sets a value
     *
     * @param {string} key
     * @param {*} value
     * @returns {boolean}
     */
    set(key: string, value: any): boolean;
    /**
     * Returns a value for a given key
     *
     * @param {string} key
     * @returns {*}
     */
    get(key: string): any;
    /**
     * Removes a value for a given key
     *
     * @param {string} key
     * @returns {*}
     */
    remove(key: string): any;
    /**
     * Removes any values which have been stored using this subStorage
     * container.
     */
    removeAll(): void;
    /**
     * Returns true if the parent storage object is available and if the
     * available flag was set durring instantiation
     *
     * @returns {boolean}
     */
    available(): boolean;
    /**
     * Returns true if the value is not undefined
     *
     * @param {string} key
     * @returns {boolean}
     */
    exists(key: string): boolean;
    /**
     * Returns a list of un-namespaced keys that have been returned by this object.
     *
     * @returns {string[]}
     */
    keys(): string[];
    private _getNamespacedKey(key);
}