mirror of
https://github.com/Esri/offline-editor-js.git
synced 2025-12-15 15:20:05 +00:00
445 lines
14 KiB
JavaScript
445 lines
14 KiB
JavaScript
/*global IDBKeyRange,indexedDB */
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"use strict";
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O.esri.Edit.EditStore = function()
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{
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this._db = null;
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// Public properties
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var dbName = "features_store";
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var objectStoreName = "features";
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var dbIndex = "featureId";
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// ENUMs
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this.ADD = "add";
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this.UPDATE = "update";
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this.DELETE = "delete";
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this.isSupported = function()
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{
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if(!window.indexedDB){
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return false;
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}
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return true;
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};
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/**
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* Commit an edit to the database
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* @param operation add, update or delete
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* @param layer the URL of the feature layer
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* @param graphic esri/graphic. The method will serialize to JSON
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* @param callback {true, edit} or {false, error}
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*/
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this.pushEdit = function(operation,layer,graphic, callback)
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{
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var edit = {
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id: layer + "/" + graphic.attributes.objectid,
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operation: operation,
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layer: layer,
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graphic: this._serialize(graphic)
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};
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var transaction = this._db.transaction([objectStoreName],"readwrite");
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transaction.oncomplete = function(event){
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callback(true);
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};
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transaction.onerror = function(event){
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callback(false,event.target.error.message);
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};
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var objectStore = transaction.objectStore(objectStoreName);
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objectStore.put(edit);
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};
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/**
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* Returns all the edits recursively via the callback
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* @param callback {value, message}
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*/
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this.getAllEdits = function(callback){
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console.assert(this._db !== null, "indexeddb not initialized");
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if(this._db !== null){
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var transaction = this._db.transaction([objectStoreName])
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.objectStore(objectStoreName)
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.openCursor();
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transaction.onsuccess = function(event)
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{
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var cursor = event.target.result;
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if(cursor){
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callback(cursor.value,null);
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cursor.continue();
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}
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else
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{
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callback(null, "end");
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}
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}.bind(this);
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transaction.onerror = function(err)
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{
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callback(null, err);
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};
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}
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else
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{
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callback(null, "no db");
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}
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};
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/**
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* Returns all the edits as a single Array via the callback
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* @param callback {value, message}
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*/
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this.getAllEditsArray = function(callback){
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console.assert(this._db !== null, "indexeddb not initialized");
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var editsArray = [];
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if(this._db !== null){
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var transaction = this._db.transaction([objectStoreName])
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.objectStore(objectStoreName)
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.openCursor();
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transaction.onsuccess = function(event)
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{
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var cursor = event.target.result;
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if(cursor){
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editsArray.push(cursor.value);
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cursor.continue();
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}
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else
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{
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callback(editsArray, "end");
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}
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}.bind(this);
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transaction.onerror = function(err)
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{
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callback(null, err);
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};
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}
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else
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{
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callback(null, "no db");
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}
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};
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/**
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* Update an edit already exists in the database
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* @param operation add, update or delete
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* @param layer the URL of the feature layer
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* @param graphic esri/graphic. The method will serialize to JSON
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* @param callback {true, edit} or {false, error}
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*/
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this.updateExistingEdit = function(operation,layer,graphic, callback){
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console.assert(this._db !== null, "indexeddb not initialized");
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var objectStore = this._db.transaction([objectStoreName],"readwrite").objectStore(objectStoreName);
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//Let's get the entry associated with the graphic
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var objectStoreGraphicRequest = objectStore.get(graphic.attributes.objectid);
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objectStoreGraphicRequest.onsuccess = function() {
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//Grab the data object returned as a result
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var data = objectStoreGraphicRequest.result;
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//Create a new update object
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var update = {
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id: layer + "/" + graphic.attributes.objectid,
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operation: operation,
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layer: layer,
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graphic: graphic.toJson()
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};
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// Insert the update into the database
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var updateGraphicRequest = objectStore.put(update);
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updateGraphicRequest.onsuccess = function(){
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callback(true);
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}
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updateGraphicRequest.onerror = function(err){
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callback(false,err);
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};
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}
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};
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/**
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* Delete a pending edit's record from the database.
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* IMPORTANT: Be aware of false negatives. See Step 4 in this function.
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*
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* @param layerUrl
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* @param graphic Graphic
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* @param callback {boolean}
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*/
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this.delete = function(layerUrl, graphic, callback){
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// NOTE: the implementation of the IndexedDB spec has a major failure with respect to
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// handling deletes. The result of the operation is specified as undefined.
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// What this means is that there is no way to tell if an operation was successful or not.
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//
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// In order to get around this we have to verify if after the attempted deletion operation
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// if the record is or is not in the database. Kinda dumb, but that's how IndexedDB works.
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//http://stackoverflow.com/questions/17137879/is-there-a-way-to-get-information-on-deleted-record-when-calling-indexeddbs-obj
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var db = this._db;
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var deferred = null;
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var self = this;
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var edit = {
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id: layerUrl + "/" + graphic.attributes.objectid,
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operation: null,
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layer: layerUrl,
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graphic: graphic.toJson()
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};
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require(["dojo/Deferred"], function(Deferred){
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deferred = new Deferred();
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// Step 1 - lets see if record exits. If it does then return callback.
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self.editExists(edit).then(function(result){
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if(result.success){
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// Step 4 - Then we check to see if the record actually exists or not.
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deferred.then(function(edit){
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// IF the delete was successful, then the record should return 'false' because it doesn't exist.
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self.editExists(edit).then(function(results){
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results.success == false ? callback(true) : callback(false);
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},
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function(){
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callback(true); //because we want this test to throw an error. That means item deleted.
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})
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},
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// There was a problem with the delete operation on the database
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function(err){
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callback(err);
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});
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var objectStore = db.transaction([objectStoreName],"readwrite").objectStore(objectStoreName);
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// Step 2 - go ahead and delete graphic
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var objectStoreDeleteRequest = objectStore.delete(edit.id);
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// Step 3 - We know that the onsuccess will always fire unless something serious goes wrong.
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// So we go ahead and resolve the deferred here.
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objectStoreDeleteRequest.onsuccess = function() {
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deferred.resolve(edit);
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};
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objectStoreDeleteRequest.onerror = function(msg){
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deferred.reject({success:false,error:msg});
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}
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}
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},
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// If there is an error in editExists()
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function(){
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callback(false);
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});
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});
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};
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this.resetEditsQueue = function(callback)
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{
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console.assert(this._db !== null, "indexeddb not initialized");
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var request = this._db.transaction([objectStoreName],"readwrite")
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.objectStore(objectStoreName)
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.clear();
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request.onsuccess = function(event){
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setTimeout(function(){callback(true);},0);
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};
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request.onerror = function(err){
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callback(false,err);
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};
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};
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this.pendingEditsCount = function(callback)
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{
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console.assert(this._db !== null, "indexeddb not initialized");
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var count = 0;
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var objectStore = this._db.transaction([objectStoreName]).objectStore(objectStoreName);
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objectStore.openCursor().onsuccess = function(evt)
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{
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var cursor = evt.target.result;
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if(cursor)
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{
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count++;
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cursor.continue();
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}
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else
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{
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callback(count);
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}
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};
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};
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/**
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* Verify is an edit already exists in the database. Checks the objectId and layerId.
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* @param newEdit {id,operation,layerId,graphicJSON}
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* @returns {deferred} {success: boolean, error: message}
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* @private
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*/
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this.editExists = function(newEdit){
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var db = this._db;
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var deferred = null;
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require(["dojo/Deferred"], function(Deferred){
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deferred = new Deferred();
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var objectStore = db.transaction([objectStoreName],"readwrite").objectStore(objectStoreName);
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//Get the entry associated with the graphic
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var objectStoreGraphicRequest = objectStore.get(newEdit.id);
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objectStoreGraphicRequest.onsuccess = function() {
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var graphic = objectStoreGraphicRequest.result;
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if(graphic && (graphic.id == newEdit.id)){
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deferred.resolve({success:true,error:null});
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}
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else{
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deferred.reject({success:false,error:"Layer id is not a match."});
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}
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};
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objectStoreGraphicRequest.onerror = function(msg){
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deferred.reject({success:false,error:msg});
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}
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});
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//We return a deferred object so that when calling this function you can chain it with a then() statement.
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return deferred;
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};
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/**
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* Returns the approximate size of the database in bytes
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* @param callback {usage, error} Whereas, the usage Object is {sizeBytes: number, editCount: number}
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*/
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this.getUsage = function(callback)
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{
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console.assert(this._db !== null, "indexeddb not initialized");
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var usage = { sizeBytes: 0, editCount: 0 };
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var transaction = this._db.transaction([objectStoreName])
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.objectStore(objectStoreName)
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.openCursor();
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console.log("dumping keys");
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transaction.onsuccess = function(event)
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{
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var cursor = event.target.result;
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if(cursor)
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{
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var storedObject = cursor.value;
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var json = JSON.stringify(storedObject);
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usage.sizeBytes += json.length;
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usage.editCount += 1;
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cursor.continue();
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}
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else
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{
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callback(usage,null);
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}
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};
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transaction.onerror = function(err)
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{
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callback(null,err);
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};
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};
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// internal methods
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//
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// graphic serialization/deserialization
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//
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this._serialize = function(graphic)
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{
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// keep only attributes and geometry, that are the values that get sent to the server by applyEdits()
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// see http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#/Apply_Edits_Feature_Service_Layer/02r3000000r6000000/
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// use graphic's built-in serializing method
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var json = graphic.toJson();
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var jsonClean =
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{
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attributes: json.attributes,
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geometry: json.geometry
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};
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return JSON.stringify(jsonClean);
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};
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this._deserialize = function(json)
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{
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var graphic;
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require(["esri/graphic"],function(Graphic){
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graphic = new Graphic(JSON.parse(json));
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});
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return graphic;
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};
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this.init = function(callback)
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{
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console.log("init editsStore.js");
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var request = indexedDB.open(dbName, 11);
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callback = callback || function(success) { console.log("EditsStore::init() success:", success); }.bind(this);
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request.onerror = function(event)
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{
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console.log("indexedDB error: " + event.target.errorCode);
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callback(false,event.target.errorCode);
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}.bind(this);
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request.onupgradeneeded = function(event)
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{
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var db = event.target.result;
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if( db.objectStoreNames.contains(objectStoreName))
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{
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db.deleteObjectStore(objectStoreName);
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}
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var objectStore = db.createObjectStore(objectStoreName, { keyPath: "id" });
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objectStore.createIndex(dbIndex,dbIndex, {unique: false});
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}.bind(this);
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request.onsuccess = function(event)
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{
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this._db = event.target.result;
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console.log("database opened successfully");
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callback(true);
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}.bind(this);
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};
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///
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/// DEPRECATED
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///
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/**
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* Deprecated @ v2.5. Use pendingEditsCount() instead.
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*/
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this.hasPendingEdits = function()
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{
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return "DEPRECATED at v2.5!";
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};
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/**
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* Deprecated @ v2.5. Use public function editExists() instead.
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*/
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this._isEditDuplicated = function(newEdit,edits){
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return "DEPRECATED at v2.5!";
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};
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};
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