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394 lines
15 KiB
JavaScript
394 lines
15 KiB
JavaScript
dojo.provide("dojox.data.JsonRestStore");
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dojo.require("dojox.data.ServiceStore");
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dojo.require("dojox.rpc.JsonRest");
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dojo.declare("dojox.data.JsonRestStore",
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dojox.data.ServiceStore,
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{
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constructor: function(options){
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//summary:
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// JsonRestStore is a Dojo Data store interface to JSON HTTP/REST web
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// storage services that support read and write through GET, PUT, POST, and DELETE.
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// options:
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// Keyword arguments
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//
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// The *schema* parameter
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// This is a schema object for this store. This should be JSON Schema format.
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//
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// The *service* parameter
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// This is the service object that is used to retrieve lazy data and save results
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// The function should be directly callable with a single parameter of an object id to be loaded
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// The function should also have the following methods:
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// put(id,value) - puts the value at the given id
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// post(id,value) - posts (appends) the value at the given id
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// delete(id) - deletes the value corresponding to the given id
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// Note that it is critical that the service parses responses as JSON.
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// If you are using dojox.rpc.Service, the easiest way to make sure this
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// happens is to make the responses have a content type of
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// application/json. If you are creating your own service, make sure you
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// use handleAs: "json" with your XHR requests.
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//
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// The *target* parameter
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// This is the target URL for this Service store. This may be used in place
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// of a service parameter to connect directly to RESTful URL without
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// using a dojox.rpc.Service object.
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//
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// The *idAttribute* parameter
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// Defaults to 'id'. The name of the attribute that holds an objects id.
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// This can be a preexisting id provided by the server.
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// If an ID isn't already provided when an object
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// is fetched or added to the store, the autoIdentity system
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// will generate an id for it and add it to the index.
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//
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// The *syncMode* parameter
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// Setting this to true will set the store to using synchronous calls by default.
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// Sync calls return their data immediately from the calling function, so
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// callbacks are unnecessary
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//
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// description:
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// The JsonRestStore will cause all saved modifications to be sent to the server using Rest commands (PUT, POST, or DELETE).
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// When using a Rest store on a public network, it is important to implement proper security measures to
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// control access to resources.
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// On the server side implementing a REST interface means providing GET, PUT, POST, and DELETE handlers.
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// GET - Retrieve an object or array/result set, this can be by id (like /table/1) or with a
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// query (like /table/?name=foo).
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// PUT - This should modify a object, the URL will correspond to the id (like /table/1), and the body will
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// provide the modified object
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// POST - This should create a new object. The URL will correspond to the target store (like /table/)
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// and the body should be the properties of the new object. The server's response should include a
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// Location header that indicates the id of the newly created object. This id will be used for subsequent
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// PUT and DELETE requests. JsonRestStore also includes a Content-Location header that indicates
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// the temporary randomly generated id used by client, and this location is used for subsequent
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// PUT/DELETEs if no Location header is provided by the server or if a modification is sent prior
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// to receiving a response from the server.
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// DELETE - This should delete an object by id.
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// These articles include more detailed information on using the JsonRestStore:
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// http://www.sitepen.com/blog/2008/06/13/restful-json-dojo-data/
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// http://blog.medryx.org/2008/07/24/jsonreststore-overview/
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//
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// example:
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// A JsonRestStore takes a REST service or a URL and uses it the remote communication for a
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// read/write dojo.data implementation. A JsonRestStore can be created with a simple URL like:
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// | new JsonRestStore({target:"/MyData/"});
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// example:
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// To use a JsonRestStore with a service, you should create a
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// service with a REST transport. This can be configured with an SMD:
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// | {
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// | services: {
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// | jsonRestStore: {
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// | transport: "REST",
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// | envelope: "URL",
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// | target: "store.php",
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// | contentType:"application/json",
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// | parameters: [
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// | {name: "location", type: "string", optional: true}
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// | ]
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// | }
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// | }
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// | }
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// The SMD can then be used to create service, and the service can be passed to a JsonRestStore. For example:
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// | var myServices = new dojox.rpc.Service(dojo.moduleUrl("dojox.rpc.tests.resources", "test.smd"));
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// | var jsonStore = new dojox.data.JsonRestStore({service:myServices.jsonRestStore});
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// example:
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// The JsonRestStore also supports lazy loading. References can be made to objects that have not been loaded.
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// For example if a service returned:
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// | {"name":"Example","lazyLoadedObject":{"$ref":"obj2"}}
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// And this object has accessed using the dojo.data API:
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// | var obj = jsonStore.getValue(myObject,"lazyLoadedObject");
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// The object would automatically be requested from the server (with an object id of "obj2").
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//
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dojo.connect(dojox.rpc.Rest._index,"onUpdate",this,function(obj,attrName,oldValue,newValue){
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var prefix = this.service.servicePath;
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if(!obj.__id){
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console.log("no id on updated object ", obj);
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}else if(obj.__id.substring(0,prefix.length) == prefix){
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this.onSet(obj,attrName,oldValue,newValue);
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}
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});
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this.idAttribute = this.idAttribute || 'id';// no options about it, we have to have identity
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//setup a byId alias to the api call
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if(typeof options.target == 'string' && !this.service){
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this.service = dojox.rpc.Rest(this.target,true); // create a default Rest service
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}
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dojox.rpc.JsonRest.registerService(this.service, options.target, this.schema);
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this.schema = this.service._schema = this.schema || this.service._schema || {};
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// wrap the service with so it goes through JsonRest manager
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this.service._store = this;
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this.schema._idAttr = this.idAttribute;
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var constructor = dojox.rpc.JsonRest.getConstructor(this.service);
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var self = this;
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this._constructor = function(data){
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constructor.call(this, data);
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self.onNew(this);
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}
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this._constructor.prototype = constructor.prototype;
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this._index = dojox.rpc.Rest._index;
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//given a url, load json data from as the store
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},
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referenceIntegrity: true,
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target:"",
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//Write API Support
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newItem: function(data, parentInfo){
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// summary:
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// adds a new item to the store at the specified point.
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// Takes two parameters, data, and options.
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//
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// data: /* object */
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// The data to be added in as an item.
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data = new this._constructor(data);
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if(parentInfo){
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// get the previous value or any empty array
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var values = this.getValue(parentInfo.parent,parentInfo.attribute,[]);
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// set the new value
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this.setValue(parentInfo.parent,parentInfo.attribute,values.concat([data]));
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}
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return data;
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},
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deleteItem: function(item){
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// summary:
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// deletes item and any references to that item from the store.
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//
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// item:
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// item to delete
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//
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// If the desire is to delete only one reference, unsetAttribute or
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// setValue is the way to go.
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var checked = [];
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var store = dojox.data._getStoreForItem(item) || this;
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if(this.referenceIntegrity){
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// cleanup all references
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dojox.rpc.JsonRest._saveNotNeeded = true;
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var index = dojox.rpc.Rest._index;
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var fixReferences = function(parent){
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var toSplice;
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// keep track of the checked ones
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checked.push(parent);
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// mark it checked so we don't run into circular loops when encountering cycles
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parent.__checked = 1;
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for(var i in parent){
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var value = parent[i];
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if(value == item){
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if(parent != index){ // make sure we are just operating on real objects
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if(parent instanceof Array){
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// mark it as needing to be spliced, don't do it now or it will mess up the index into the array
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(toSplice = toSplice || []).push(i);
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}else{
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// property, just delete it.
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(dojox.data._getStoreForItem(parent) || store).unsetAttribute(parent, i);
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}
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}
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}else{
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if((typeof value == 'object') && value){
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if(!value.__checked){
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// recursively search
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fixReferences(value);
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}
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if(typeof value.__checked == 'object' && parent != index){
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// if it is a modified array, we will replace it
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(dojox.data._getStoreForItem(parent) || store).setValue(parent, i, value.__checked);
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}
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}
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}
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}
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if(toSplice){
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// we need to splice the deleted item out of these arrays
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i = toSplice.length;
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parent = parent.__checked = parent.concat(); // indicates that the array is modified
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while(i--){
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parent.splice(toSplice[i], 1);
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}
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return parent;
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}
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return null;
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};
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// start with the index
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fixReferences(index);
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dojox.rpc.JsonRest._saveNotNeeded = false;
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var i = 0;
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while(checked[i]){
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// remove the checked marker
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delete checked[i++].__checked;
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}
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}
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dojox.rpc.JsonRest.deleteObject(item);
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store.onDelete(item);
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},
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changing: function(item,_deleting){
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// summary:
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// adds an item to the list of dirty items. This item
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// contains a reference to the item itself as well as a
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// cloned and trimmed version of old item for use with
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// revert.
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dojox.rpc.JsonRest.changing(item,_deleting);
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},
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setValue: function(item, attribute, value){
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// summary:
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// sets 'attribute' on 'item' to 'value'
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var old = item[attribute];
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var store = item.__id ? dojox.data._getStoreForItem(item) : this;
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if(dojox.json.schema && store.schema && store.schema.properties){
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// if we have a schema and schema validator available we will validate the property change
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dojox.json.schema.mustBeValid(dojox.json.schema.checkPropertyChange(value,store.schema.properties[attribute]));
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}
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if(attribute == store.idAttribute){
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throw new Error("Can not change the identity attribute for an item");
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}
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store.changing(item);
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item[attribute]=value;
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store.onSet(item,attribute,old,value);
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},
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setValues: function(item, attribute, values){
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// summary:
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// sets 'attribute' on 'item' to 'value' value
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// must be an array.
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if(!dojo.isArray(values)){
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throw new Error("setValues expects to be passed an Array object as its value");
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}
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this.setValue(item,attribute,values);
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},
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unsetAttribute: function(item, attribute){
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// summary:
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// unsets 'attribute' on 'item'
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this.changing(item);
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var old = item[attribute];
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delete item[attribute];
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this.onSet(item,attribute,old,undefined);
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},
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save: function(kwArgs){
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// summary:
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// Saves the dirty data using REST Ajax methods. See dojo.data.api.Write for API.
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//
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// kwArgs.global:
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// This will cause the save to commit the dirty data for all
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// JsonRestStores as a single transaction.
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if(!(kwArgs && kwArgs.global)){
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(kwArgs = kwArgs || {}).service = this.service;
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}
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var actions = dojox.rpc.JsonRest.commit(kwArgs);
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this.serverVersion = this._updates && this._updates.length;
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return actions;
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},
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revert: function(kwArgs){
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// summary
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// returns any modified data to its original state prior to a save();
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//
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// kwArgs.global:
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// This will cause the revert to undo all the changes for all
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// JsonRestStores in a single operation.
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var dirtyObjects = dojox.rpc.JsonRest.getDirtyObjects().concat([]);
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while (dirtyObjects.length>0){
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var d = dirtyObjects.pop();
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var store = dojox.data._getStoreForItem(d.object || d.old);
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if(!d.object){
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// was a deletion, we will add it back
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store.onNew(d.old);
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}else if(!d.old){
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// was an addition, remove it
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store.onDelete(d.object);
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}else{
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// find all the properties that were modified
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for(var i in d.object){
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if(d.object[i] != d.old[i]){
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store.onSet(d.object, i, d.object[i], d.old[i]);
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}
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}
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}
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}
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dojox.rpc.JsonRest.revert(kwArgs && kwArgs.global && this.service);
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},
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isDirty: function(item){
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// summary
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// returns true if the item is marked as dirty.
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return dojox.rpc.JsonRest.isDirty(item);
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},
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isItem: function(item, anyStore){
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// summary:
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// Checks to see if a passed 'item'
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// really belongs to this JsonRestStore.
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//
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// item: /* object */
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// The value to test for being an item
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// anyStore: /* boolean*/
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// If true, this will return true if the value is an item for any JsonRestStore,
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// not just this instance
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return item && item.__id && (anyStore || this.service == dojox.rpc.JsonRest.getServiceAndId(item.__id).service);
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},
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_doQuery: function(args){
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var query= typeof args.queryStr == 'string' ? args.queryStr : args.query;
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return dojox.rpc.JsonRest.query(this.service,query, args);
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},
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_processResults: function(results, deferred){
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// index the results
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var count = results.length;
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// if we don't know the length, and it is partial result, we will guess that it is twice as big, that will work for most widgets
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return {totalCount:deferred.fullLength || (deferred.request.count == count ? (deferred.request.start || 0) + count * 2 : count), items: results};
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},
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getConstructor: function(){
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// summary:
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// Gets the constructor for objects from this store
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return this._constructor;
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},
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getIdentity: function(item){
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var id = item.__clientId || item.__id;
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if(!id){
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return id;
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}
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var prefix = this.service.servicePath;
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// support for relative or absolute referencing with ids
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return id.substring(0,prefix.length) != prefix ? id : id.substring(prefix.length); // String
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},
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fetchItemByIdentity: function(args){
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var id = args.identity;
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var store = this;
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// if it is an absolute id, we want to find the right store to query
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if(id.toString().match(/^(\w*:)?\//)){
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var serviceAndId = dojox.rpc.JsonRest.getServiceAndId(id);
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store = serviceAndId.service._store;
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args.identity = serviceAndId.id;
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}
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args._prefix = store.service.servicePath;
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return store.inherited(arguments);
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},
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//Notifcation Support
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onSet: function(){},
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onNew: function(){},
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onDelete: function(){},
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getFeatures: function(){
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// summary:
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// return the store feature set
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var features = this.inherited(arguments);
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features["dojo.data.api.Write"] = true;
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features["dojo.data.api.Notification"] = true;
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return features;
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}
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}
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);
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dojox.data._getStoreForItem = function(item){
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if(item.__id){
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var servicePath = item.__id.toString().match(/.*\//)[0];
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var service = dojox.rpc.JsonRest.services[servicePath];
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return service ? service._store : new dojox.data.JsonRestStore({target:servicePath});
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}
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return null;
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};
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dojox.json.ref._useRefs = true; // Use referencing when identifiable objects are referenced
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