source: [view]
define("dojo/data/ObjectStore", ["dojo", "dojo/regexp"], function(dojo) {
dojo.declare("dojo.data.ObjectStore", null,{
objectStore: null,
constructor: function(options){
// summary:
// A Dojo Data implementation that wraps Dojo object stores for backwards
// compatibility.
// options:
// The configuration information to pass into the data store.
// options.objectStore:
// The object store to use as the source provider for this data store
dojo.mixin(this, options);
},
labelProperty: "label",
getValue: function(/*Object*/ item, /*String*/property, /*value?*/defaultValue){
// summary:
// Gets the value of an item's 'property'
//
// item:
// The item to get the value from
// property:
// property to look up value for
// defaultValue:
// the default value
return typeof item.get === "function" ? item.get(property) :
property in item ?
item[property] : defaultValue;
},
getValues: function(item, property){
// summary:
// Gets the value of an item's 'property' and returns
// it. If this value is an array it is just returned,
// if not, the value is added to an array and that is returned.
//
// item: /* object */
// property: /* string */
// property to look up value for
var val = this.getValue(item,property);
return val instanceof Array ? val : val === undefined ? [] : [val];
},
getAttributes: function(item){
// summary:
// Gets the available attributes of an item's 'property' and returns
// it as an array.
//
// item: /* object */
var res = [];
for(var i in item){
if(item.hasOwnProperty(i) && !(i.charAt(0) == '_' && i.charAt(1) == '_')){
res.push(i);
}
}
return res;
},
hasAttribute: function(item,attribute){
// summary:
// Checks to see if item has attribute
//
// item: /* object */
// attribute: /* string */
return attribute in item;
},
containsValue: function(item, attribute, value){
// summary:
// Checks to see if 'item' has 'value' at 'attribute'
//
// item: /* object */
// attribute: /* string */
// value: /* anything */
return dojo.indexOf(this.getValues(item,attribute),value) > -1;
},
isItem: function(item){
// summary:
// Checks to see if the argument is an item
//
// item: /* object */
// attribute: /* string */
// we have no way of determining if it belongs, we just have object returned from
// service queries
return (typeof item == 'object') && item && !(item instanceof Date);
},
isItemLoaded: function(item){
// summary:
// Checks to see if the item is loaded.
//
// item: /* object */
return item && typeof item.load !== "function";
},
loadItem: function(args){
// summary:
// Loads an item and calls the callback handler. Note, that this will call the callback
// handler even if the item is loaded. Consequently, you can use loadItem to ensure
// that an item is loaded is situations when the item may or may not be loaded yet.
// If you access a value directly through property access, you can use this to load
// a lazy value as well (doesn't need to be an item).
//
// example:
// store.loadItem({
// item: item, // this item may or may not be loaded
// onItem: function(item){
// // do something with the item
// }
// });
var item;
if(typeof args.item.load === "function"){
dojo.when(args.item.load(), function(result){
item = result; // in synchronous mode this can allow loadItem to return the value
var func = result instanceof Error ? args.onError : args.onItem;
if(func){
func.call(args.scope, result);
}
});
}else if(args.onItem){
// even if it is already loaded, we will use call the callback, this makes it easier to
// use when it is not known if the item is loaded (you can always safely call loadItem).
args.onItem.call(args.scope, args.item);
}
return item;
},
close: function(request){
return request && request.abort && request.abort();
},
fetch: function(args){
// summary:
// See dojo.data.api.Read.fetch
//
args = args || {};
var self = this;
var scope = args.scope || self;
var query = args.query;
if(typeof query == "object"){ // can be null, but that is ignore by for-in
query = dojo.delegate(query); // don't modify the original
for(var i in query){
// find any strings and convert them to regular expressions for wildcard support
var required = query[i];
if(typeof required == "string"){
query[i] = RegExp("^" + dojo.regexp.escapeString(required, "*?").replace(/\*/g, '.*').replace(/\?/g, '.') + "$", args.queryOptions && args.queryOptions.ignoreCase ? "mi" : "m");
query[i].toString = (function(original){
return function(){
return original;
}
})(required);
}
}
}
var results = this.objectStore.query(query, args);
dojo.when(results.total, function(totalCount){
dojo.when(results, function(results){
if(args.onBegin){
args.onBegin.call(scope, totalCount || results.length, args);
}
if(args.onItem){
for(var i=0; i args.onItem.call(scope, results[i], args);
}
}
if(args.onComplete){
args.onComplete.call(scope, args.onItem ? null : results, args);
}
return results;
}, errorHandler);
}, errorHandler);
function errorHandler(error){
if(args.onError){
args.onError.call(scope, error, args);
}
}
args.abort = function(){
// abort the request
if(results.cancel){
results.cancel();
}
};
args.store = this;
return args;
},
getFeatures: function(){
// summary:
// return the store feature set
return {
"dojo.data.api.Read": !!this.objectStore.get,
"dojo.data.api.Identity": true,
"dojo.data.api.Write": !!this.objectStore.put,
"dojo.data.api.Notification": true
};
},
getLabel: function(/* item */ item){
// summary:
// See dojo.data.api.Read.getLabel()
if(this.isItem(item)){
return this.getValue(item,this.labelProperty); //String
}
return undefined; //undefined
},
getLabelAttributes: function(/* item */ item){
// summary:
// See dojo.data.api.Read.getLabelAttributes()
return [this.labelProperty]; //array
},
//Identity API Support
getIdentity: function(item){
return item.getId ? item.getId() : item[this.objectStore.idProperty || "id"];
},
getIdentityAttributes: function(item){
// summary:
// returns the attributes which are used to make up the
// identity of an item. Basically returns this.objectStore.idProperty
return [this.objectStore.idProperty];
},
fetchItemByIdentity: function(args){
// summary:
// fetch an item by its identity, by looking in our index of what we have loaded
var item;
dojo.when(this.objectStore.get(args.identity),
function(result){
item = result;
args.onItem.call(args.scope, result);
},
function(error){
args.onError.call(args.scope, error);
}
);
return item;
},
newItem: function(data, parentInfo){
// summary:
// adds a new item to the store at the specified point.
// Takes two parameters, data, and options.
//
// data: /* object */
// The data to be added in as an item.
if(parentInfo){
// get the previous value or any empty array
var values = this.getValue(parentInfo.parent,parentInfo.attribute,[]);
// set the new value
values = values.concat([data]);
data.__parent = values;
this.setValue(parentInfo.parent, parentInfo.attribute, values);
}
this._dirtyObjects.push({object:data, save: true});
this.onNew(data);
return data;
},
deleteItem: function(item){
// summary:
// deletes item and any references to that item from the store.
//
// item:
// item to delete
//
// If the desire is to delete only one reference, unsetAttribute or
// setValue is the way to go.
this.changing(item, true);
this.onDelete(item);
},
setValue: function(item, attribute, value){
// summary:
// sets 'attribute' on 'item' to 'value'
var old = item[attribute];
this.changing(item);
item[attribute]=value;
this.onSet(item,attribute,old,value);
},
setValues: function(item, attribute, values){
// summary:
// sets 'attribute' on 'item' to 'value' value
// must be an array.
if(!dojo.isArray(values)){
throw new Error("setValues expects to be passed an Array object as its value");
}
this.setValue(item,attribute,values);
},
unsetAttribute: function(item, attribute){
// summary:
// unsets 'attribute' on 'item'
this.changing(item);
var old = item[attribute];
delete item[attribute];
this.onSet(item,attribute,old,undefined);
},
_dirtyObjects: [],
changing: function(object,_deleting){
// summary:
// adds an object to the list of dirty objects. This object
// contains a reference to the object itself as well as a
// cloned and trimmed version of old object for use with
// revert.
object.__isDirty = true;
//if an object is already in the list of dirty objects, don't add it again
//or it will overwrite the premodification data set.
for(var i=0; i var dirty = this._dirtyObjects[i];
if(object==dirty.object){
if(_deleting){
// we are deleting, no object is an indicator of deletiong
dirty.object = false;
if(!this._saveNotNeeded){
dirty.save = true;
}
}
return;
}
}
var old = object instanceof Array ? [] : {};
for(i in object){
if(object.hasOwnProperty(i)){
old[i] = object[i];
}
}
this._dirtyObjects.push({object: !_deleting && object, old: old, save: !this._saveNotNeeded});
},
save: function(kwArgs){
// summary:
// Saves the dirty data using object store provider. See dojo.data.api.Write for API.
//
// kwArgs.global:
// This will cause the save to commit the dirty data for all
// ObjectStores as a single transaction.
//
// kwArgs.revertOnError
// This will cause the changes to be reverted if there is an
// error on the save. By default a revert is executed unless
// a value of false is provide for this parameter.
kwArgs = kwArgs || {};
var result, actions = [];
var alreadyRecorded = {};
var savingObjects = [];
var self;
var dirtyObjects = this._dirtyObjects;
var left = dirtyObjects.length;// this is how many changes are remaining to be received from the server
try{
dojo.connect(kwArgs,"onError",function(){
if(kwArgs.revertOnError !== false){
var postCommitDirtyObjects = dirtyObjects;
dirtyObjects = savingObjects;
var numDirty = 0; // make sure this does't do anything if it is called again
jr.revert(); // revert if there was an error
self._dirtyObjects = postCommitDirtyObjects;
}
else{
self._dirtyObjects = dirtyObject.concat(savingObjects);
}
});
if(this.objectStore.transaction){
var transaction = this.objectStore.transaction();
}
for(var i = 0; i < dirtyObjects.length; i++){
var dirty = dirtyObjects[i];
var object = dirty.object;
var old = dirty.old;
delete object.__isDirty;
if(object){
result = this.objectStore.put(object, {overwrite: !!old});
}
else{
result = this.objectStore.remove(this.getIdentity(old));
}
savingObjects.push(dirty);
dirtyObjects.splice(i--,1);
dojo.when(result, function(value){
if(!(--left)){
if(kwArgs.onComplete){
kwArgs.onComplete.call(kwArgs.scope, actions);
}
}
},function(value){
// on an error we want to revert, first we want to separate any changes that were made since the commit
left = -1; // first make sure that success isn't called
kwArgs.onError.call(kwArgs.scope, value);
});
}
if(transaction){
transaction.commit();
}
}catch(e){
kwArgs.onError.call(kwArgs.scope, value);
}
},
revert: function(kwArgs){
// summary
// returns any modified data to its original state prior to a save();
//
var dirtyObjects = this._dirtyObjects;
for(var i = dirtyObjects.length; i > 0;){
i--;
var dirty = dirtyObjects[i];
var object = dirty.object;
var old = dirty.old;
if(object && old){
// changed
for(var j in old){
if(old.hasOwnProperty(j) && object[j] !== old[j]){
this.onSet(object, j, object[j], old[j]);
object[j] = old[j];
}
}
for(j in object){
if(!old.hasOwnProperty(j)){
this.onSet(object, j, object[j]);
delete object[j];
}
}
}else if(!old){
// was an addition, remove it
this.onDelete(object);
}else{
// was a deletion, we will add it back
this.onNew(old);
}
delete (object || old).__isDirty;
dirtyObjects.splice(i, 1);
}
},
isDirty: function(item){
// summary
// returns true if the item is marked as dirty or true if there are any dirty items
if(!item){
return !!this._dirtyObjects.length;
}
return item.__isDirty;