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/*
* Javascript hook interface
*/
elgg.provide('elgg.config.hooks');
/**
* Registers an hook handler with the event system.
*
* The special keyword "all" can be used for either the name or the type or both
* and means to call that handler for all of those hooks.
*
* @param {String} name Name of the plugin hook to register for
* @param {String} type Type of the event to register for
* @param {Function} handler Handle to call
* @param {Number} priority Priority to call the event handler
* @return {Bool}
*/
elgg.register_hook_handler = function(name, type, handler, priority) {
elgg.assertTypeOf('string', name);
elgg.assertTypeOf('string', type);
elgg.assertTypeOf('function', handler);
if (!name || !type) {
return false;
}
var priorities = elgg.config.hooks;
elgg.provide(name + '.' + type, priorities);
if (!(priorities[name][type] instanceof elgg.ElggPriorityList)) {
priorities[name][type] = new elgg.ElggPriorityList();
}
return priorities[name][type].insert(handler, priority);
};
/**
* Emits a hook.
*
* Loops through all registered hooks and calls the handler functions in order.
* Every handler function will always be called, regardless of the return value.
*
* @warning Handlers take the same 4 arguments in the same order as when calling this function.
* This is different to the PHP version!
*
* Hooks are called in this order:
* specifically registered (event_name and event_type match)
* all names, specific type
* specific name, all types
* all names, all types
*
* @param {String} name Name of the hook to emit
* @param {String} type Type of the hook to emit
* @param {Object} params Optional parameters to pass to the handlers
* @param {Object} value Initial value of the return. Can be mangled by handlers
*
* @return {Bool}
*/
elgg.trigger_hook = function(name, type, params, value) {
elgg.assertTypeOf('string', name);
elgg.assertTypeOf('string', type);
// default to true if unpassed
value = value || true;
var hooks = elgg.config.hooks,
tempReturnValue = null,
returnValue = value,
callHookHandler = function(handler) {
tempReturnValue = handler(name, type, params, value);
};
elgg.provide(name + '.' + type, hooks);
elgg.provide('all.' + type, hooks);
elgg.provide(name + '.all', hooks);
elgg.provide('all.all', hooks);
[ hooks[name][type],
hooks['all'][type],
hooks[name]['all'],
hooks['all']['all']
].every(function(handlers) {
if (handlers instanceof elgg.ElggPriorityList) {
handlers.forEach(callHookHandler);
}
return true;
});
return (tempReturnValue !== null) ? tempReturnValue : returnValue;
};
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