assets/www/js/filerepo.js

   1 var FileRepo = new function() {
   2         /* API for files repository */
   3         var self = this;
   4         this.root = null;
   5
   6         this.init = function(success, error) {
   7                 self.initRoot(success);
   8         };
   9
  10         this.initRoot = function(success) {
  11                 // fs size is irrelevant, PERSISTENT is futile (on Android, at least)
  12                 window.requestFileSystem(LocalFileSystem.TEMPORARY, 0, function(fs) {
  13                         console.log('local fs found: ' + fs.root.fullPath);
  14                         self.root = fs.root;
  15                         success && success();
  16                 }, function() {
  17                         console.log('local fs not found');
  18                         success && success();
  19                 });
  20         };
  21
  22
  23         this.withLocalHtml = function(book_id, success, error) {
  24                 console.log('info:withLocalHtml: id:' + book_id);
  25                 View.spinner('Otwieranie treści utworu');
  26                 if (!self.root)
  27                         error && error('info:withLocalHtml: no local html: no usable filesystem');
  28
  29                 var url = "file://" + self.root.fullPath + "/html/" + book_id;
  30                 console.log('info:withLocalHtml: local ajax: ' + url);
  31                 var xhr = new XMLHttpRequest();
  32                 xhr.open('GET', url, true);
  33                 xhr.onload = function() {
  34                         console.log('info:withLocalHtml: fetched by local ajax: ' + url);
  35                         success && success(xhr.responseText);
  36                 }
  37                 xhr.onerror = error;
  38                 xhr.send();
  39         };
  40
  41
  42         this.withLocal = function(win, fail) {
  43                 if (self.root) {
  44                         self.root.getDirectory('html', {}, function(dir) {
  45                                 var reader = dir.createReader();
  46                                 reader.readEntries(win, fail);
  47                         });
  48                 }
  49                 else {
  50                         win && win([]);
  51                 }
  52         }
  53
  54
  55         // downloads HTML file from server, saves it in cache and calls success with file contents
  56         this.withHtmlFromServer = function(book_id, success, error) {
  57                 console.log('info:withHtmlFromServer: id:' + book_id);
  58                 // read file from WL
  59                 Catalogue.withBook(book_id, function(book) {
  60                         var url = WL + book.html_file;
  61                         console.log('info:withHtmlFromServer: fetching url: ' + url);
  62
  63                         View.spinner("Pobieranie treści utworu z sieci");
  64
  65                         if (self.root) {
  66                                 Downloader.downloadFile(url, self.root.fullPath + "/html/", ""+book_id, true,
  67                                         function(data){
  68                                                 console.log('info:withHtmlFromServer: loaded file from WL');
  69                                                 self.withLocalHtml(book_id, success, error);
  70                                         }, function(data) {
  71                                                 console.log('error downloading file!')
  72                                                 error && error("error: " + data);
  73                                         });
  74                         }
  75                         else {
  76                                 // there's no big fs, so we'll just get the text from AJAX
  77                                 console.log('info:withHtmlFromServer: ajax: ' + url);
  78                                 var xhr = new XMLHttpRequest();
  79                                 xhr.open("GET", url);
  80                                 xhr.onload = function() {
  81                                         console.log('info:withHtmlFromServer: fetched by ajax: ' + url);
  82                                         success && success(xhr.responseText);
  83                                 }
  84                                 xhr.onerror = function() {
  85                                         console.log('error downloading file!')
  86                                         error && error("error: " + data);
  87                                 }
  88                                 xhr.send();
  89                         }
  90                 });
  91         };
  92
  93         // calls the callback with contents of the HTML file for a given book,
  94         // loaded from the server and cached locally
  95         this.withHtml = function(id, success, error) {
  96                 console.log('info:withHtml: id:' + id);
  97                 self.withLocalHtml(id, success, function() {
  98                         self.withHtmlFromServer(id, success, error);
  99                 });
 100         };
 101
 102
 103         this.clear = function() {
 104                 FileRepo.withLocal(function(local) {
 105                         for (i in local) {
 106                                 local[i].remove();
 107                         }
 108                 });
 109         };
 110
 111
 112         this.deleteIfExists = function(id) {
 113                 if (self.root) {
 114                         self.root.getFile('html/' + id, {create: false}, function(f) {
 115                                 f.remove();
 116                         });
 117                 }
 118         }
 119 };