discourse/app/assets/javascripts/preload_store.js

52 lines
1.5 KiB
JavaScript

/* We can insert data into the PreloadStore when the document is loaded.
The data can be accessed once by a key, after which it is removed */
PreloadStore = {
data: {},
store: function(key, value) {
this.data[key] = value;
},
/* To retrieve a key, you provide the key you want, plus a finder to
load it if the key cannot be found. Once the key is used once, it is
removed from the store. So, for example, you can't load a preloaded topic
more than once. */
get: function(key, finder) {
var promise, result;
promise = new RSVP.Promise();
if (this.data[key]) {
promise.resolve(this.data[key]);
delete this.data[key];
} else {
if (finder) {
result = finder();
// If the finder returns a promise, we support that too
if (result.then) {
result.then(function(result) {
return promise.resolve(result);
}, function(result) {
return promise.reject(result);
});
} else {
promise.resolve(result);
}
} else {
promise.resolve(void 0);
}
}
return promise;
},
/* Does the store contain a particular key? Does not delete, just returns
true or false. */
contains: function(key) {
return this.data[key] !== void 0;
},
/* If we are sure it's preloaded, we don't have to supply a finder. Just
returns undefined if it's not in the store. */
getStatic: function(key) {
var result;
result = this.data[key];
delete this.data[key];
return result;
}
};