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/*******************************************************************************
* OpenAjax.js
*
* Reference implementation of the OpenAjax Hub, as specified by OpenAjax Alliance.
* Specification is under development at:
*
* http://www.openajax.org/member/wiki/OpenAjax_Hub_Specification
*
* Copyright 2006-2007 OpenAjax Alliance
*
* 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.
*
******************************************************************************/
// prevent re-definition of the OpenAjax object
if(!window["OpenAjax"]){
OpenAjax = new function(){
// summary:
// the OpenAjax hub
// description:
// see http://www.openajax.org/member/wiki/OpenAjax_Hub_Specification
var libs = {};
var ooh = "org.openajax.hub.";
var h = {};
this.hub = h;
h.implementer = "http://openajax.org";
h.implVersion = "0.6";
h.specVersion = "0.6";
h.implExtraData = {};
h.libraries = libs;
h.registerLibrary = function(prefix, nsURL, version, extra){
libs[prefix] = {
prefix: prefix,
namespaceURI: nsURL,
version: version,
extraData: extra
};
this.publish(ooh+"registerLibrary", libs[prefix]);
};
h.unregisterLibrary = function(prefix){
this.publish(ooh+"unregisterLibrary", libs[prefix]);
delete libs[prefix];
};
h._subscriptions = { c:{}, s:[] };
h._cleanup = [];
h._subIndex = 0;
h._pubDepth = 0;
h.subscribe = function(name, callback, scope, subscriberData, filter){
if(!scope){
scope = window;
}
var handle = name + "." + this._subIndex;
var sub = { scope: scope, cb: callback, fcb: filter, data: subscriberData, sid: this._subIndex++, hdl: handle };
var path = name.split(".");
this._subscribe(this._subscriptions, path, 0, sub);
return handle;
};
h.publish = function(name, message){
var path = name.split(".");
this._pubDepth++;
this._publish(this._subscriptions, path, 0, name, message);
this._pubDepth--;
if((this._cleanup.length > 0) && (this._pubDepth == 0)){
for(var i = 0; i < this._cleanup.length; i++){
this.unsubscribe(this._cleanup[i].hdl);
}
delete(this._cleanup);
this._cleanup = [];
}
};
h.unsubscribe = function(sub){
var path = sub.split(".");
var sid = path.pop();
this._unsubscribe(this._subscriptions, path, 0, sid);
};
h._subscribe = function(tree, path, index, sub){
var token = path[index];
if(index == path.length){
tree.s.push(sub);
}else{
if(typeof tree.c == "undefined"){
tree.c = {};
}
if(typeof tree.c[token] == "undefined"){
tree.c[token] = { c: {}, s: [] };
}
this._subscribe(tree.c[token], path, index + 1, sub);
}
};
h._publish = function(tree, path, index, name, msg){
if(typeof tree != "undefined"){
var node;
if(index == path.length){
node = tree;
}else{
this._publish(tree.c[path[index]], path, index + 1, name, msg);
this._publish(tree.c["*"], path, index + 1, name, msg);
node = tree.c["**"];
}
if(typeof node != "undefined"){
var callbacks = node.s;
var max = callbacks.length;
for(var i = 0; i < max; i++){
if(callbacks[i].cb){
var sc = callbacks[i].scope;
var cb = callbacks[i].cb;
var fcb = callbacks[i].fcb;
var d = callbacks[i].data;
if(typeof cb == "string"){
// get a function object
cb = sc[cb];
}
if(typeof fcb == "string"){
// get a function object
fcb = sc[fcb];
}
if((!fcb) ||
(fcb.call(sc, name, msg, d))){
cb.call(sc, name, msg, d);
}
}
}
}
}
};
h._unsubscribe = function(tree, path, index, sid){
if(typeof tree != "undefined"){
if(index < path.length){
var childNode = tree.c[path[index]];
this._unsubscribe(childNode, path, index + 1, sid);
if(childNode.s.length == 0){
for(var x in childNode.c)
return;
delete tree.c[path[index]];
}
return;
}
else{
var callbacks = tree.s;
var max = callbacks.length;
for(var i = 0; i < max; i++){
if(sid == callbacks[i].sid){
if(this._pubDepth > 0){
callbacks[i].cb = null;
this._cleanup.push(callbacks[i]);
}
else
callbacks.splice(i, 1);
return;
}
}
}
}
};
// The following function is provided for automatic testing purposes.
// It is not expected to be deployed in run-time OpenAjax Hub implementations.
h.reinit = function(){
for (var lib in OpenAjax.hub.libraries){
delete OpenAjax.hub.libraries[lib];
}
OpenAjax.hub.registerLibrary("OpenAjax", "http://openajax.org/hub", "0.6", {});
delete OpenAjax._subscriptions;
OpenAjax._subscriptions = {c:{},s:[]};
delete OpenAjax._cleanup;
OpenAjax._cleanup = [];
OpenAjax._subIndex = 0;
OpenAjax._pubDepth = 0;
};
};
// Register the OpenAjax Hub itself as a library.
OpenAjax.hub.registerLibrary("OpenAjax", "http://openajax.org/hub", "0.6", {});
}
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