gecko/mobile/android/modules/Messaging.jsm

45 lines
1.4 KiB
JavaScript

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict"
const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
this.EXPORTED_SYMBOLS = ["sendMessageToJava"];
XPCOMUtils.defineLazyServiceGetter(this, "uuidgen",
"@mozilla.org/uuid-generator;1",
"nsIUUIDGenerator");
function sendMessageToJava(aMessage, aCallback) {
if (aCallback) {
let id = uuidgen.generateUUID().toString();
let obs = {
observe: function(aSubject, aTopic, aData) {
let data = JSON.parse(aData);
if (data.__guid__ != id) {
return;
}
Services.obs.removeObserver(obs, aMessage.type + ":Response", false);
if (data.status === "cancel") {
// No Java-side listeners handled our callback.
return;
}
aCallback(data.status === "success" ? data.response : null,
data.status === "error" ? data.response : null);
}
}
aMessage.__guid__ = id;
Services.obs.addObserver(obs, aMessage.type + ":Response", false);
}
return Services.androidBridge.handleGeckoMessage(aMessage);
}