pretty much working version

[wl-mobile.git] / assets / www / js / filerepo.js

diff --git a/assets/www/js/filerepo.js b/assets/www/js/filerepo.js
new file mode 100644 (file)
index 0000000..0bd196b
--- /dev/null
+++ b/assets/www/js/filerepo.js
@@ -0,0 +1,119 @@
+var FileRepo = new function() {
+       /* API for files repository */
+       var self = this;
+       this.root = null;
+
+       this.init = function(success, error) {
+               self.initRoot(success);
+       };
+
+       this.initRoot = function(success) {
+               // fs size is irrelevant, PERSISTENT is futile (on Android, at least)
+               window.requestFileSystem(LocalFileSystem.TEMPORARY, 0, function(fs) {
+                       console.log('local fs found: ' + fs.root.fullPath);
+                       self.root = fs.root;
+                       success && success();
+               }, function() {
+                       console.log('local fs not found');
+                       success && success();
+               });
+       };
+
+
+       this.withLocalHtml = function(book_id, success, error) {
+               console.log('info:withLocalHtml: id:' + book_id);
+               View.spinner('Otwieranie treści utworu');
+               if (!self.root)
+                       error && error('info:withLocalHtml: no local html: no usable filesystem');
+
+               var url = "file://" + self.root.fullPath + "/html/" + book_id;
+               console.log('info:withLocalHtml: local ajax: ' + url);
+               var xhr = new XMLHttpRequest();
+               xhr.open('GET', url, true);
+               xhr.onload = function() {
+                       console.log('info:withLocalHtml: fetched by local ajax: ' + url);
+                       success && success(xhr.responseText);
+               }
+               xhr.onerror = error;
+               xhr.send();
+       };
+
+
+       this.withLocal = function(win, fail) {
+               if (self.root) {
+                       self.root.getDirectory('html', {}, function(dir) {
+                               var reader = dir.createReader();
+                               reader.readEntries(win, fail);
+                       });
+               }
+               else {
+                       win && win([]);
+               }
+       }
+
+
+       // downloads HTML file from server, saves it in cache and calls success with file contents
+       this.withHtmlFromServer = function(book_id, success, error) {
+               console.log('info:withHtmlFromServer: id:' + book_id);
+               // read file from WL
+               Catalogue.withBook(book_id, function(book) {
+                       var url = WL + book.html_file;
+                       console.log('info:withHtmlFromServer: fetching url: ' + url);
+
+                       View.spinner("Pobieranie treści utworu z sieci");
+
+                       if (self.root) {
+                               Downloader.downloadFile(url, self.root.fullPath + "/html/", ""+book_id, true,
+                                       function(data){
+                                               console.log('info:withHtmlFromServer: loaded file from WL');
+                                               self.withLocalHtml(book_id, success, error);
+                                       }, function(data) {
+                                               console.log('error downloading file!')
+                                               error && error("error: " + data);
+                                       });
+                       }
+                       else {
+                               // there's no big fs, so we'll just get the text from AJAX
+                               console.log('info:withHtmlFromServer: ajax: ' + url);
+                               var xhr = new XMLHttpRequest();
+                               xhr.open("GET", url);
+                               xhr.onload = function() {
+                                       console.log('info:withHtmlFromServer: fetched by ajax: ' + url);
+                                       success && success(xhr.responseText);
+                               }
+                               xhr.onerror = function() {
+                                       console.log('error downloading file!')
+                                       error && error("error: " + data);
+                               }
+                               xhr.send();
+                       }
+               });             
+       };
+       
+       // calls the callback with contents of the HTML file for a given book,
+       // loaded from the server and cached locally
+       this.withHtml = function(id, success, error) {
+               console.log('info:withHtml: id:' + id);
+               self.withLocalHtml(id, success, function() {
+                       self.withHtmlFromServer(id, success, error);
+               });
+       };
+
+
+       this.clear = function() {
+               FileRepo.withLocal(function(local) {
+                       for (i in local) {
+                               local[i].remove();
+                       }
+               });
+       };
+
+
+       this.deleteIfExists = function(id) {
+               if (self.root) {
+                       self.root.getFile('html/' + id, {create: false}, function(f) {
+                               f.remove();
+                       });
+               }
+       }
+};