wp/nwyj/.svn/pristine/73/7394552a151b688487dcd3c9e1ec0aa4ee81879c.svn-base

if (!dojo._hasResource["dojox.storage.WhatWGStorageProvider"]) { // _hasResource
																	// checks
																	// added by
																	// build. Do
																	// not use
																	// _hasResource
																	// directly
																	// in your
																	// code.
	dojo._hasResource["dojox.storage.WhatWGStorageProvider"] = true;
	dojo.provide("dojox.storage.WhatWGStorageProvider");
	dojo.require("dojox.storage.Provider");
	dojo.require("dojox.storage.manager");

	dojo.declare("dojox.storage.WhatWGStorageProvider",
			[dojox.storage.Provider], {
				// summary:
				// Storage provider that uses WHAT Working Group features in
				// Firefox 2
				// to achieve permanent storage.
				// description:
				// The WHAT WG storage API is documented at
				// http://www.whatwg.org/specs/web-apps/current-work/#scs-client-side
				//
				// You can disable this storage provider with the following
				// djConfig
				// variable:
				// var djConfig = { disableWhatWGStorage: true };
				//		
				// Authors of this storage provider-
				// JB Boisseau, jb.boisseau@eutech-ssii.com
				// Brad Neuberg, bkn3@columbia.edu

				initialized : false,

				_domain : null,
				_available : null,
				_statusHandler : null,
				_allNamespaces : null,
				_storageEventListener : null,

				initialize : function() {
					if (djConfig["disableWhatWGStorage"] == true) {
						return;
					}

					// get current domain
					// see: https://bugzilla.mozilla.org/show_bug.cgi?id=357323
					this._domain = (location.hostname == "localhost")
							? "localhost.localdomain"
							: location.hostname;
					// console.debug(this._domain);

					// indicate that this storage provider is now loaded
					this.initialized = true;
					dojox.storage.manager.loaded();
				},

				isAvailable : function() {
					try {
						// see:
						// https://bugzilla.mozilla.org/show_bug.cgi?id=357323
						var myStorage = globalStorage[((location.hostname == "localhost")
								? "localhost.localdomain"
								: location.hostname)];
					} catch (e) {
						this._available = false;
						return this._available;
					}

					this._available = true;
					return this._available;
				},

				put : function(key, value, resultsHandler, namespace) {
					if (this.isValidKey(key) == false) {
						throw new Error("Invalid key given: " + key);
					}
					namespace = namespace || this.DEFAULT_NAMESPACE;

					// get our full key name, which is namespace + key
					key = this.getFullKey(key, namespace);

					this._statusHandler = resultsHandler;

					// serialize the value;
					// handle strings differently so they have better
					// performance
					if (dojo.isString(value)) {
						value = "string:" + value;
					} else {
						value = dojo.toJson(value);
					}

					// register for successful storage events.
					var storageListener = dojo.hitch(this, function(evt) {
								// remove any old storage event listener we
								// might have added
								// to the window on old put() requests; Firefox
								// has a bug
								// where it can occassionaly go into infinite
								// loops calling
								// our storage event listener over and over --
								// this is a
								// workaround
								// FIXME: Simplify this into a test case and
								// submit it
								// to Firefox
								window.removeEventListener("storage",
										storageListener, false);

								// indicate we succeeded
								if (resultsHandler) {
									resultsHandler
											.call(null, this.SUCCESS, key);
								}
							});

					window.addEventListener("storage", storageListener, false);

					// try to store the value
					try {
						var myStorage = globalStorage[this._domain];
						myStorage.setItem(key, value);
					} catch (e) {
						// indicate we failed
						this._statusHandler.call(null, this.FAILED, key, e
										.toString());
					}
				},

				get : function(key, namespace) {
					if (this.isValidKey(key) == false) {
						throw new Error("Invalid key given: " + key);
					}
					namespace = namespace || this.DEFAULT_NAMESPACE;

					// get our full key name, which is namespace + key
					key = this.getFullKey(key, namespace);

					// sometimes, even if a key doesn't exist, Firefox
					// will return a blank string instead of a null --
					// this _might_ be due to having underscores in the
					// keyname, but I am not sure.

					// FIXME: Simplify this bug into a testcase and
					// submit it to Firefox
					var myStorage = globalStorage[this._domain];
					var results = myStorage.getItem(key);

					if (results == null || results == "") {
						return null;
					}

					results = results.value;

					// destringify the content back into a
					// real JavaScript object;
					// handle strings differently so they have better
					// performance
					if (dojo.isString(results) && (/^string:/.test(results))) {
						results = results.substring("string:".length);
					} else {
						results = dojo.fromJson(results);
					}

					return results;
				},

				getNamespaces : function() {
					var results = [this.DEFAULT_NAMESPACE];

					// simply enumerate through our array and save any string
					// that starts with __
					var found = {};
					var myStorage = globalStorage[this._domain];
					var tester = /^__([^_]*)_/;
					for (var i = 0; i < myStorage.length; i++) {
						var currentKey = myStorage.key(i);
						if (tester.test(currentKey) == true) {
							var currentNS = currentKey.match(tester)[1];
							// have we seen this namespace before?
							if (typeof found[currentNS] == "undefined") {
								found[currentNS] = true;
								results.push(currentNS);
							}
						}
					}

					return results;
				},

				getKeys : function(namespace) {
					namespace = namespace || this.DEFAULT_NAMESPACE;

					if (this.isValidKey(namespace) == false) {
						throw new Error("Invalid namespace given: " + namespace);
					}

					// create a regular expression to test the beginning
					// of our key names to see if they match our namespace;
					// if it is the default namespace then test for the presence
					// of no namespace for compatibility with older versions
					// of dojox.storage
					var namespaceTester;
					if (namespace == this.DEFAULT_NAMESPACE) {
						namespaceTester = new RegExp("^([^_]{2}.*)$");
					} else {
						namespaceTester = new RegExp("^__" + namespace
								+ "_(.*)$");
					}

					var myStorage = globalStorage[this._domain];
					var keysArray = [];
					for (var i = 0; i < myStorage.length; i++) {
						var currentKey = myStorage.key(i);
						if (namespaceTester.test(currentKey) == true) {
							// strip off the namespace portion
							currentKey = currentKey.match(namespaceTester)[1];
							keysArray.push(currentKey);
						}
					}

					return keysArray;
				},

				clear : function(namespace) {
					namespace = namespace || this.DEFAULT_NAMESPACE;

					if (this.isValidKey(namespace) == false) {
						throw new Error("Invalid namespace given: " + namespace);
					}

					// create a regular expression to test the beginning
					// of our key names to see if they match our namespace;
					// if it is the default namespace then test for the presence
					// of no namespace for compatibility with older versions
					// of dojox.storage
					var namespaceTester;
					if (namespace == this.DEFAULT_NAMESPACE) {
						namespaceTester = new RegExp("^[^_]{2}");
					} else {
						namespaceTester = new RegExp("^__" + namespace + "_");
					}

					var myStorage = globalStorage[this._domain];
					var keys = [];
					for (var i = 0; i < myStorage.length; i++) {
						if (namespaceTester.test(myStorage.key(i)) == true) {
							keys[keys.length] = myStorage.key(i);
						}
					}

					dojo.forEach(keys, dojo.hitch(myStorage, "removeItem"));
				},

				remove : function(key, namespace) {
					// get our full key name, which is namespace + key
					key = this.getFullKey(key, namespace);

					var myStorage = globalStorage[this._domain];
					myStorage.removeItem(key);
				},

				isPermanent : function() {
					return true;
				},

				getMaximumSize : function() {
					return this.SIZE_NO_LIMIT;
				},

				hasSettingsUI : function() {
					return false;
				},

				showSettingsUI : function() {
					throw new Error(this.declaredClass
							+ " does not support a storage settings user-interface");
				},

				hideSettingsUI : function() {
					throw new Error(this.declaredClass
							+ " does not support a storage settings user-interface");
				},

				getFullKey : function(key, namespace) {
					namespace = namespace || this.DEFAULT_NAMESPACE;

					if (this.isValidKey(namespace) == false) {
						throw new Error("Invalid namespace given: " + namespace);
					}

					// don't append a namespace string for the default
					// namespace,
					// for compatibility with older versions of dojox.storage
					if (namespace == this.DEFAULT_NAMESPACE) {
						return key;
					} else {
						return "__" + namespace + "_" + key;
					}
				}
			});

	dojox.storage.manager.register("dojox.storage.WhatWGStorageProvider",
			new dojox.storage.WhatWGStorageProvider());

}