// namespaces
var dwv = dwv || {};
dwv.io = dwv.io || {};
/**
* Memory loader.
*
* @class
*/
dwv.io.MemoryLoader = function () {
/**
* Closure to self.
*
* @private
* @type {object}
*/
var self = this;
/**
* Input data.
*
* @private
* @type {Array}
*/
var inputData = null;
/**
* Data loader.
*
* @private
* @type {object}
*/
var runningLoader = null;
/**
* Number of loaded data.
*
* @private
* @type {number}
*/
var nLoad = 0;
/**
* Number of load end events.
*
* @private
* @type {number}
*/
var nLoadend = 0;
/**
* The default character set (optional).
*
* @private
* @type {string}
*/
var defaultCharacterSet;
/**
* Get the default character set.
*
* @returns {string} The default character set.
*/
this.getDefaultCharacterSet = function () {
return defaultCharacterSet;
};
/**
* Set the default character set.
*
* @param {string} characterSet The character set.
*/
this.setDefaultCharacterSet = function (characterSet) {
defaultCharacterSet = characterSet;
};
/**
* Store the current input.
*
* @param {object} data The input data.
* @private
*/
function storeInputData(data) {
inputData = data;
// reset counters
nLoad = 0;
nLoadend = 0;
// clear storage
clearStoredLoader();
}
/**
* Store the launched loader.
*
* @param {object} loader The launched loader.
* @private
*/
function storeLoader(loader) {
runningLoader = loader;
}
/**
* Clear the stored loader.
*
* @private
*/
function clearStoredLoader() {
runningLoader = null;
}
/**
* Launch a load item event and call addLoad.
*
* @param {object} event The load data event.
* @private
*/
function addLoadItem(event) {
self.onloaditem(event);
addLoad();
}
/**
* Increment the number of loaded data
* and call onload if loaded all data.
*
* @param {object} _event The load data event.
* @private
*/
function addLoad(_event) {
nLoad++;
// call self.onload when all is loaded
// (not using the input event since it is not the
// general load)
if (nLoad === inputData.length) {
self.onload({
source: inputData
});
}
}
/**
* Increment the counter of load end events
* and run callbacks when all done, erroneus or not.
*
* @param {object} _event The load end event.
* @private
*/
function addLoadend(_event) {
nLoadend++;
// call self.onloadend when all is run
// (not using the input event since it is not the
// general load end)
if (nLoadend === inputData.length) {
self.onloadend({
source: inputData
});
}
}
/**
* Load a list of buffers.
*
* @param {Array} data The list of buffers to load.
*/
this.load = function (data) {
// check input
if (typeof data === 'undefined' || data.length === 0) {
return;
}
storeInputData(data);
// send start event
this.onloadstart({
source: data
});
// create prgress handler
var mproghandler = new dwv.utils.MultiProgressHandler(self.onprogress);
mproghandler.setNToLoad(data.length);
mproghandler.setNumberOfDimensions(1);
// create loaders
var loaders = [];
for (var m = 0; m < dwv.io.loaderList.length; ++m) {
loaders.push(new dwv.io[dwv.io.loaderList[m]]());
}
// find an appropriate loader
var dataElement = data[0];
var loader = null;
var foundLoader = false;
for (var l = 0; l < loaders.length; ++l) {
loader = loaders[l];
if (loader.canLoadUrl(dataElement.filename)) {
foundLoader = true;
// load options
loader.setOptions({
numberOfFiles: data.length,
defaultCharacterSet: this.getDefaultCharacterSet()
});
// set loader callbacks
// loader.onloadstart: nothing to do
loader.onprogress = mproghandler.getUndefinedMonoProgressHandler(0);
if (typeof loader.onloaditem === 'undefined') {
// handle loaditem locally
loader.onload = addLoadItem;
} else {
loader.onloaditem = self.onloaditem;
loader.onload = addLoad;
}
loader.onloadend = addLoadend;
loader.onerror = self.onerror;
loader.onabort = self.onabort;
// store loader
storeLoader(loader);
// exit
break;
}
}
if (!foundLoader) {
throw new Error('No loader found for data: ' + dataElement.filename);
}
// loop on I/O elements
for (var i = 0; i < data.length; ++i) {
dataElement = data[i];
// check loader
if (!loader.canLoadFile({name: dataElement.filename})) {
throw new Error('Input data of different type: ' +
dataElement.filename);
}
// read
loader.load(dataElement.data, dataElement.filename, i);
}
};
/**
* Abort a load.
*/
this.abort = function () {
// abort loader
if (runningLoader && runningLoader.isLoading()) {
runningLoader.abort();
}
};
}; // class MemoryLoader
/**
* Handle a load start event.
* Default does nothing.
*
* @param {object} _event The load start event.
*/
dwv.io.MemoryLoader.prototype.onloadstart = function (_event) {};
/**
* Handle a load progress event.
* Default does nothing.
*
* @param {object} _event The progress event.
*/
dwv.io.MemoryLoader.prototype.onprogress = function (_event) {};
/**
* Handle a load item event.
* Default does nothing.
*
* @param {object} _event The load item event fired
* when a file item has been loaded successfully.
*/
dwv.io.MemoryLoader.prototype.onloaditem = function (_event) {};
/**
* Handle a load event.
* Default does nothing.
*
* @param {object} _event The load event fired
* when a file has been loaded successfully.
*/
dwv.io.MemoryLoader.prototype.onload = function (_event) {};
/**
* Handle a load end event.
* Default does nothing.
*
* @param {object} _event The load end event fired
* when a file load has completed, successfully or not.
*/
dwv.io.MemoryLoader.prototype.onloadend = function (_event) {};
/**
* Handle an error event.
* Default does nothing.
*
* @param {object} _event The error event.
*/
dwv.io.MemoryLoader.prototype.onerror = function (_event) {};
/**
* Handle an abort event.
* Default does nothing.
*
* @param {object} _event The abort event.
*/
dwv.io.MemoryLoader.prototype.onabort = function (_event) {};