Andrej Cimperšek - diploma

import DojoExternalInterface;

class Storage{

	public static var SUCCESS = "success";

	public static var FAILED = "failed";

	public static var PENDING = "pending";

	//	Wait the following number of milliseconds before flushing

	public static var FLUSH_DELAY_DEFAULT = 500;

	public var flush_delay;

	public var so;

	public var timer;

	private var _NAMESPACE_KEY = "allNamespaces";

	public function Storage(){

		flush_delay = Storage.FLUSH_DELAY_DEFAULT;

		DojoExternalInterface.initialize();

		DojoExternalInterface.addCallback("put", this, put);

		DojoExternalInterface.addCallback("putMultiple", this, putMultiple);

		DojoExternalInterface.addCallback("get", this, get);

		DojoExternalInterface.addCallback("getMultiple", this, getMultiple);

		DojoExternalInterface.addCallback("showSettings", this, showSettings);

		DojoExternalInterface.addCallback("clear", this, clear);

		DojoExternalInterface.addCallback("getKeys", this, getKeys);

		DojoExternalInterface.addCallback("getNamespaces", this, getNamespaces);

		DojoExternalInterface.addCallback("remove", this, remove);

		DojoExternalInterface.addCallback("removeMultiple", this, removeMultiple);

		DojoExternalInterface.addCallback("flush", this, flush);

		DojoExternalInterface.addCallback("setFlushDelay", this, setFlushDelay);

		DojoExternalInterface.addCallback("getFlushDelay", this, getFlushDelay);

		DojoExternalInterface.loaded();

		// preload the System Settings finished button movie for offline

		// access so it is in the cache

		_root.createEmptyMovieClip("_settingsBackground", 1);

		_root._settingsBackground.loadMovie(DojoExternalInterface.dojoPath 

																				+ "../dojox/storage/storage_dialog.swf");

	}

  //  FIXME: Whoever added this Flush code did not document why it

  //  exists. Please also put your name and a bug number so I know 

  //  who to contact. -- Brad Neuberg

	//	Set a new value for the flush delay timer.

	//	Possible values:

	//	  0 : Perform the flush synchronously after each "put" request

	//	> 0 : Wait until 'newDelay' ms have passed without any "put" request to flush

	//	 -1 : Do not automatically flush

	public function setFlushDelay(newDelay){

		flush_delay = Number(newDelay);

	}

	public function getFlushDelay(){

		return String(flush_delay);

	}

	public function flush(namespace){

		if(timer){

			_global.clearTimeout(timer);

			delete timer;

		}

		var so = SharedObject.getLocal(namespace);

		var flushResults = so.flush();

		// return results of this command to JavaScript

		var statusResults;

		if(flushResults == true){

			statusResults = Storage.SUCCESS;

		}else if(flushResults == "pending"){

			statusResults = Storage.PENDING;

		}else{

			statusResults = Storage.FAILED;

		}

		DojoExternalInterface.call("dojox.storage._onStatus", statusResults, 

		                            null, namespace);

	}

	public function put(keyName, keyValue, namespace){

		// Get the SharedObject for these values and save it

		so = SharedObject.getLocal(namespace);

		//  Save the key and value

		so.data[keyName] = keyValue;

		// Save the namespace

		// FIXME: Tie this into the flush/no-flush stuff below; right now

		// we immediately write out this namespace. -- Brad Neuberg

    addNamespace(namespace, keyName);

		//	Do all the flush/no-flush stuff

		var keyNames = new Array(); 

		keyNames[0] = keyName;

		postWrite(so, keyNames, namespace);

	}

	public function putMultiple(metaKey, metaValue, metaLengths, namespace){

		// Get the SharedObject for these values and save it

		so = SharedObject.getLocal(namespace);

		//	Create array of keys and value lengths

		var keys = metaKey.split(",");

		var lengths = metaLengths.split(",");

		//	Loop through the array and write the values

		for(var i = 0; i < keys.length; i++){

			so.data[keys[i]] = metaValue.slice(0,lengths[i]);

			metaValue = metaValue.slice(lengths[i]);

		}

		// Save the namespace

		// FIXME: Tie this into the flush/no-flush stuff below; right now

		// we immediately write out this namespace. -- Brad Neuberg

    addNamespace(namespace, null);

		//	Do all the flush/no-flush stuff

		postWrite(so, keys, namespace);

	}

	public function postWrite(so, keyNames, namespace){

		//	TODO: Review all this 'handler' stuff. In particular, the flush 

		//  could now be with keys pending from several different requests, not 

		//  only the ones passed in this method call

		// prepare a storage status handler

		var self = this;

		so.onStatus = function(infoObject:Object){

			//trace("onStatus, infoObject="+infoObject.code);

			// delete the data value if the request was denied

			if(infoObject.code == "SharedObject.Flush.Failed"){

				for(var i=0;i<keyNames.length;i++){

					delete self.so.data[keyNames[i]];

				}

			}

			var statusResults;

			if(infoObject.code == "SharedObject.Flush.Failed"){

				statusResults = Storage.FAILED;

			}else if(infoObject.code == "SharedObject.Flush.Pending"){

				statusResults = Storage.PENDING;

			}else if(infoObject.code == "SharedObject.Flush.Success"){

				// if we have succeeded saving our value, see if we

				// need to update our list of namespaces

				if(self.hasNamespace(namespace) == true){

					statusResults = Storage.SUCCESS;

				}else{

					// we have a new namespace we must store

					self.addNamespace(namespace, keyNames[0]);

					return;

				}

			}

			//trace("onStatus, statusResults="+statusResults);

			// give the status results to JavaScript

			DojoExternalInterface.call("dojox.storage._onStatus", statusResults, 

			                            keyNames[0], namespace);

		}

		//	Clear any pending flush timers

		if(timer){

			_global.clearTimeout(timer);

		}

		//	If we have a flush delay set, set a timer for its execution

		if(flush_delay > 0){

			timer = _global.setTimeout(flush, flush_delay, namespace);

		//	With a flush_delay value of 0, execute the flush request synchronously

		}else if(flush_delay == 0){

			flush(namespace);

		}

		//	Otherwise just don't flush - will be probably be flushed manually

	}

	public function get(keyName, namespace){

		// Get the SharedObject for these values and save it

		so = SharedObject.getLocal(namespace);

		var results = so.data[keyName];

		return results;

	}

	//	Returns an array with the contents of each key value on the metaKeys array

	public function getMultiple(metaKeys, namespace){

		//	get the storage object

		so = SharedObject.getLocal(namespace);

		//	Create array of keys to read

		var keys = metaKeys.split(",");

		var results = new Array();

		//	Read from storage into results array

		for(var i = 0;i < keys.length;i++){

			var val = so.data[keys[i]];

			val = val.split("\\").join("\\\\");

			val = val.split('"').join('\\"');

			results.push( val);

		}

		//	Make the results array into a string

		var metaResults = '["' + results.join('","') + '"]';

		return metaResults;

	}	

	public function showSettings(){

		// Show the configuration options for the Flash player, opened to the

		// section for local storage controls (pane 1)

		System.showSettings(1);

		// there is no way we can intercept when the Close button is pressed, allowing us

		// to hide the Flash dialog. Instead, we need to load a movie in the

		// background that we can show a close button on.

		_root.createEmptyMovieClip("_settingsBackground", 1);

		_root._settingsBackground.loadMovie(DojoExternalInterface.dojoPath 

																				+ "../dojox/storage/storage_dialog.swf");

	}

	public function clear(namespace){

		so = SharedObject.getLocal(namespace);

		so.clear();

		so.flush();

		// remove this namespace entry now

		removeNamespace(namespace);

	}

	public function getKeys(namespace) : String{

		// Returns a list of the available keys in this namespace

		// get the storage object

		so = SharedObject.getLocal(namespace);

		// get all of the keys

		var results = [];

		for(var i in so.data){

			results.push(i);	

		}

		// remove our key that records our list of namespaces

		for(var i = 0; i < results.length; i++){

			if(results[i] == _NAMESPACE_KEY){

				results.splice(i, 1);

				break;

			}

		}

		// a bug in ExternalInterface transforms Arrays into

		// Strings, so we can't use those here! -- BradNeuberg

		results = results.join(",");

		return results;

	}

	public function getNamespaces() : String{

		var allNamespaces = SharedObject.getLocal(_NAMESPACE_KEY);

		var results = [];

		for(var i in allNamespaces.data){

			results.push(i);

		}

		// a bug in ExternalInterface transforms Arrays into

		// Strings, so we can use those here! -- BradNeuberg

		results = results.join(",");

		return results;

	}

	public function remove(keyName, namespace){

		// Removes a key

		// get the storage object

		so = SharedObject.getLocal(namespace);

		// delete this value

		delete so.data[keyName];

		// save the changes

		so.flush();

		// see if we are the last entry for this namespace

		var availableKeys = getKeys(namespace);

		if(availableKeys == ""){

			// we are empty

			removeNamespace(namespace);

		}

	}

	//	Removes all the values for each keys on the metaKeys array

	public function removeMultiple(metaKeys, namespace){		

		//	get the storage object

		so = SharedObject.getLocal(namespace);

		//	Create array of keys to read

		var keys = metaKeys.split(",");

		var results = new Array();

		//	Delete elements

		for(var i=0;i<keys.length;i++){

			delete so.data[keys[i]];

		}

		// see if there are no more entries for this namespace

		var availableKeys = getKeys(namespace);

		if(availableKeys == ""){

			// we are empty

			removeNamespace(namespace);

		}

	}

	private function hasNamespace(namespace):Boolean{

		// Get the SharedObject for the namespace list

		var allNamespaces = SharedObject.getLocal(_NAMESPACE_KEY);

		var results = false;

		for(var i in allNamespaces.data){

			if(i == namespace){

				results = true;

				break;

			}

		}

		return results;

	}

	// FIXME: This code has gotten ugly -- refactor

	private function addNamespace(namespace, keyName){

		if(hasNamespace(namespace) == true){

			return;

		}

		// Get the SharedObject for the namespace list

		var allNamespaces = SharedObject.getLocal(_NAMESPACE_KEY);

		// prepare a storage status handler if the keyName is

		// not null

		if(keyName != null && typeof keyName != "undefined"){

			var self = this;

			allNamespaces.onStatus = function(infoObject:Object){

				// delete the data value if the request was denied

				if(infoObject.code == "SharedObject.Flush.Failed"){

					delete self.so.data[keyName];

				}

				var statusResults;

				if(infoObject.code == "SharedObject.Flush.Failed"){

					statusResults = Storage.FAILED;

				}else if(infoObject.code == "SharedObject.Flush.Pending"){

					statusResults = Storage.PENDING;

				}else if(infoObject.code == "SharedObject.Flush.Success"){

					statusResults = Storage.SUCCESS;

				}

				// give the status results to JavaScript

				DojoExternalInterface.call("dojox.storage._onStatus", statusResults, 

				                            keyName, namespace);

			}

		}

		// save the namespace list

		allNamespaces.data[namespace] = true;

		var flushResults = allNamespaces.flush();

		// return results of this command to JavaScript

		if(keyName != null && typeof keyName != "undefined"){

			var statusResults;

			if(flushResults == true){

				statusResults = Storage.SUCCESS;

			}else if(flushResults == "pending"){

				statusResults = Storage.PENDING;

			}else{

				statusResults = Storage.FAILED;

			}

			DojoExternalInterface.call("dojox.storage._onStatus", statusResults, 

			                            keyName, namespace);

		}

	}

	// FIXME: This code has gotten ugly -- refactor

	private function removeNamespace(namespace){

		if(hasNamespace(namespace) == false){

			return;

		}

		// try to save the namespace list; don't have a return

		// callback; if we fail on this, the worst that will happen

		// is that we have a spurious namespace entry

		var allNamespaces = SharedObject.getLocal(_NAMESPACE_KEY);

		delete allNamespaces.data[namespace];

		allNamespaces.flush();

	}

	static function main(mc){

		_root.app = new Storage(); 

	}

}