/**
* @class Ext.data.Api
* @extends Object
* Ext.data.Api is a singleton designed to manage the data API including methods
* for validating a developer's DataProxy API. Defines variables for CRUD actions
* create, read, update and destroy in addition to a mapping of RESTful HTTP methods
* GET, POST, PUT and DELETE to CRUD actions.
* @singleton
*/
Ext.data.Api = (function() {
// private validActions. validActions is essentially an inverted hash of Ext.data.Api.actions, where value becomes the key.
// Some methods in this singleton (e.g.: getActions, getVerb) will loop through actions with the code for (var verb in this.actions)
// For efficiency, some methods will first check this hash for a match. Those methods which do acces validActions will cache their result here.
// We cannot pre-define this hash since the developer may over-ride the actions at runtime.
var validActions = {};
return {
/**
* Defined actions corresponding to remote actions:
*
actions: {
create : 'create', // Text representing the remote-action to create records on server.
read : 'read', // Text representing the remote-action to read/load data from server.
update : 'update', // Text representing the remote-action to update records on server.
destroy : 'destroy' // Text representing the remote-action to destroy records on server.
}
*
* @property actions
* @type Object
*/
actions : {
create : 'create',
read : 'read',
update : 'update',
destroy : 'destroy'
},
/**
* Defined {CRUD action}:{HTTP method} pairs to associate HTTP methods with the
* corresponding actions for {@link Ext.data.DataProxy#restful RESTful proxies}.
* Defaults to:
*
restActions : {
create : 'POST',
read : 'GET',
update : 'PUT',
destroy : 'DELETE'
},
*
*/
restActions : {
create : 'POST',
read : 'GET',
update : 'PUT',
destroy : 'DELETE'
},
/**
* Returns true if supplied action-name is a valid API action defined in {@link #actions} constants
* @param {String} action
* @param {String[]}(Optional) List of available CRUD actions. Pass in list when executing multiple times for efficiency.
* @return {Boolean}
*/
isAction : function(action) {
return (Ext.data.Api.actions[action]) ? true : false;
},
/**
* Returns the actual CRUD action KEY "create", "read", "update" or "destroy" from the supplied action-name. This method is used internally and shouldn't generally
* need to be used directly. The key/value pair of Ext.data.Api.actions will often be identical but this is not necessarily true. A developer can override this naming
* convention if desired. However, the framework internally calls methods based upon the KEY so a way of retreiving the the words "create", "read", "update" and "destroy" is
* required. This method will cache discovered KEYS into the private validActions hash.
* @param {String} name The runtime name of the action.
* @return {String||null} returns the action-key, or verb of the user-action or null if invalid.
* @nodoc
*/
getVerb : function(name) {
if (validActions[name]) {
return validActions[name]; // <-- found in cache. return immediately.
}
for (var verb in this.actions) {
if (this.actions[verb] === name) {
validActions[name] = verb;
break;
}
}
return (validActions[name] !== undefined) ? validActions[name] : null;
},
/**
* Returns true if the supplied API is valid; that is, check that all keys match defined actions
* otherwise returns an array of mistakes.
* @return {String[]||true}
*/
isValid : function(api){
var invalid = [];
var crud = this.actions; // <-- cache a copy of the actions.
for (var action in api) {
if (!(action in crud)) {
invalid.push(action);
}
}
return (!invalid.length) ? true : invalid;
},
/**
* Returns true if the supplied verb upon the supplied proxy points to a unique url in that none of the other api-actions
* point to the same url. The question is important for deciding whether to insert the "xaction" HTTP parameter within an
* Ajax request. This method is used internally and shouldn't generally need to be called directly.
* @param {Ext.data.DataProxy} proxy
* @param {String} verb
* @return {Boolean}
*/
hasUniqueUrl : function(proxy, verb) {
var url = (proxy.api[verb]) ? proxy.api[verb].url : null;
var unique = true;
for (var action in proxy.api) {
if ((unique = (action === verb) ? true : (proxy.api[action].url != url) ? true : false) === false) {
break;
}
}
return unique;
},
/**
* This method is used internally by {@link Ext.data.DataProxy DataProxy} and should not generally need to be used directly.
* Each action of a DataProxy api can be initially defined as either a String or an Object. When specified as an object,
* one can explicitly define the HTTP method (GET|POST) to use for each CRUD action. This method will prepare the supplied API, setting
* each action to the Object form. If your API-actions do not explicitly define the HTTP method, the "method" configuration-parameter will
* be used. If the method configuration parameter is not specified, POST will be used.
new Ext.data.HttpProxy({
method: "POST", // <-- default HTTP method when not specified.
api: {
create: 'create.php',
load: 'read.php',
save: 'save.php',
destroy: 'destroy.php'
}
});
// Alternatively, one can use the object-form to specify the API
new Ext.data.HttpProxy({
api: {
load: {url: 'read.php', method: 'GET'},
create: 'create.php',
destroy: 'destroy.php',
save: 'update.php'
}
});
*
* @param {Ext.data.DataProxy} proxy
*/
prepare : function(proxy) {
if (!proxy.api) {
proxy.api = {}; // <-- No api? create a blank one.
}
for (var verb in this.actions) {
var action = this.actions[verb];
proxy.api[action] = proxy.api[action] || proxy.url || proxy.directFn;
if (typeof(proxy.api[action]) == 'string') {
proxy.api[action] = {
url: proxy.api[action]
};
}
}
},
/**
* Prepares a supplied Proxy to be RESTful. Sets the HTTP method for each api-action to be one of
* GET, POST, PUT, DELETE according to the defined {@link #restActions}.
* @param {Ext.data.DataProxy} proxy
*/
restify : function(proxy) {
proxy.restful = true;
for (var verb in this.restActions) {
proxy.api[this.actions[verb]].method = this.restActions[verb];
}
// TODO: perhaps move this interceptor elsewhere? like into DataProxy, perhaps? Placed here
// to satisfy initial 3.0 final release of REST features.
proxy.onWrite = proxy.onWrite.createInterceptor(function(action, o, response, rs) {
var reader = o.reader;
var res = {};
switch (response.status) {
case 200: // standard 200 response, send control back to HttpProxy#onWrite
return true;
break;
case 201: // entity created but no response returned
res[reader.meta.successProperty] = true;
break;
case 204: // no-content. Create a fake response.
res[reader.meta.successProperty] = true;
res[reader.meta.root] = null;
break;
default:
return true;
break;
}
if (res[reader.meta.successProperty] === true) {
this.fireEvent("write", this, action, res[reader.meta.root], res, rs, o.request.arg);
} else {
this.fireEvent('exception', this, 'remote', action, o, res, rs);
}
o.request.callback.call(o.request.scope, res[reader.meta.root], res, res[reader.meta.successProperty]);
return false; // <-- false to prevent intercepted function from running.
}, proxy);
}
};
})();
/**
* @class Ext.data.Api.Error
* @extends Ext.Error
* Error class for Ext.data.Api errors
*/
Ext.data.Api.Error = Ext.extend(Ext.Error, {
constructor : function(message, arg) {
this.arg = arg;
Ext.Error.call(this, message);
},
name: 'Ext.data.Api'
});
Ext.apply(Ext.data.Api.Error.prototype, {
lang: {
'action-url-undefined': 'No fallback url defined for this action. When defining a DataProxy api, please be sure to define an url for each CRUD action in Ext.data.Api.actions or define a default url in addition to your api-configuration.',
'invalid': 'received an invalid API-configuration. Please ensure your proxy API-configuration contains only the actions defined in Ext.data.Api.actions',
'invalid-url': 'Invalid url. Please review your proxy configuration.',
'execute': 'Attempted to execute an unknown action. Valid API actions are defined in Ext.data.Api.actions"'
}
});