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88 lines
1.8 KiB
JavaScript
88 lines
1.8 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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const EXPORTED_METHODS = [
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"getState",
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"clear",
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"get",
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"set",
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"delete",
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"setFromState",
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];
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/**
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* Module that contains global session data.
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*/
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export function GlobalState() {
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let internal = new GlobalStateInternal();
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let external = {};
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for (let method of EXPORTED_METHODS) {
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external[method] = internal[method].bind(internal);
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}
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return Object.freeze(external);
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}
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function GlobalStateInternal() {
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// Storage for global state.
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this.state = {};
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}
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GlobalStateInternal.prototype = {
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/**
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* Get all value from the global state.
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*/
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getState() {
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return this.state;
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},
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/**
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* Clear all currently stored global state.
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*/
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clear() {
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this.state = {};
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},
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/**
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* Retrieve a value from the global state.
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*
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* @param aKey
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* A key the value is stored under.
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* @return The value stored at aKey, or an empty string if no value is set.
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*/
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get(aKey) {
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return this.state[aKey] || "";
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},
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/**
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* Set a global value.
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*
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* @param aKey
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* A key to store the value under.
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*/
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set(aKey, aStringValue) {
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this.state[aKey] = aStringValue;
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},
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/**
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* Delete a global value.
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*
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* @param aKey
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* A key to delete the value for.
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*/
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delete(aKey) {
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delete this.state[aKey];
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},
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/**
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* Set the current global state from a state object. Any previous global
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* state will be removed, even if the new state does not contain a matching
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* key.
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*
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* @param aState
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* A state object to extract global state from to be set.
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*/
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setFromState(aState) {
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this.state = (aState && aState.global) || {};
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},
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};
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