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storageEngine = function() {
	var initialized = false;
	var initializedObjectStores = {};
	function getStorageObject(type) {
	    var item = localStorage.getItem(type); 
	    var parsedItem = JSON.parse(item); 
	    return parsedItem;	
	}

	
	return {
		init : function(successCallback, errorCallback) {
			if (window.localStorage) {
				initialized = true;
				successCallback(null);
			} else {
				errorCallback('storage_api_not_supported', 'The web storage api is not supported');
			}
		},
	    initObjectStore : function(type, successCallback, errorCallback) {
	    	if (!initialized) {
				errorCallback('storage_api_not_initialized', 'The storage engine has not been initialized');
			} else if (!localStorage.getItem(type)) {
	    		localStorage.setItem(type, JSON.stringify({}));
	    	}
	    	initializedObjectStores[type] = true;
	    	successCallback(null);
	    },
	    save: function(type, obj, successCallback, errorCallback) { 
	        if (!initialized) {
	       	   errorCallback('storage_api_not_initialized', 'The storage engine has not been initialized');
	        } else if (!initializedObjectStores[type]) {
	    	  errorCallback('store_not_initialized', 'The object store '+type+' has not been initialized');
	        }	
	        if (!obj.id) { 
	            obj.id = $.now(); 
	        } 
	        var storageItem = getStorageObject(type); 
	        storageItem[obj.id] = obj; 
	        localStorage.setItem(type, JSON.stringify(storageItem)); 
	        successCallback(obj);
	    },
		findAll : function(type, successCallback, errorCallback) { 
			if (!initialized) {
				errorCallback('storage_api_not_initialized', 'The storage engine has not been initialized');
			} else if (!initializedObjectStores[type]) {
				errorCallback('store_not_initialized', 'The object store '+type+' has not been initialized');
			}
			var result = [];
			var storageItem = getStorageObject(type); 
			$.each(storageItem, function(i, v) {
				result.push(v);
			});
			successCallback(result);
		},
		delete : function(type, id, successCallback, errorCallback) { 
		    if (!initialized) {
		        errorCallback('storage_api_not_initialized', 'The storage engine has not been initialized');
		    } else if (!initializedObjectStores[type]) {
		        errorCallback('store_not_initialized', 'The object store '+type+' has not been initialized');
		    }
		    var storageItem = getStorageObject(type); 
			if (storageItem[id]) {
			    delete storageItem[id];
			    localStorage.setItem(type, JSON.stringify(storageItem)); 
				successCallback(id);
			} else {
		        errorCallback("object_not_found","The object requested could not be found");
		    }
		},
		findByProperty : function(type, propertyName, propertyValue, successCallback, errorCallback) {
			if (!initialized) {
				errorCallback('storage_api_not_initialized', 'The storage engine has not been initialized');
			} else if (!initializedObjectStores[type]) {
				errorCallback('store_not_initialized', 'The object store '+type+' has not been initialized');
			}
			var result = [];
			var storageItem = getStorageObject(type); 
			$.each(storageItem, function(i, v) {
				if (v[propertyName] === propertyValue) {
					result.push(v);
				}
			}); 
			successCallback(result);
		},
		findById : function (type, id, successCallback, errorCallback)	{
			if (!initialized) {
				errorCallback('storage_api_not_initialized', 'The storage engine has not been initialized');
			} else if (!initializedObjectStores[type]) {
				errorCallback('store_not_initialized', 'The object store '+type+' has not been initialized');
			}	
			var storageItem = getStorageObject(type); 
			var result = storageItem[id];
			successCallback(result);
		}

	}
}();