Evergreen/staff_client/chrome/content/evergreen/util/file.js

   1 sdump('D_TRACE','Loading file.js\n');
   2
   3 var dirService = Components.classes["@mozilla.org/file/directory_service;1"].
   4         getService( Components.interfaces.nsIProperties );
   5
   6 //////////////////////////////////////////////////////////////////////////////////////////////////////
   7
   8 function set_object_in_file(file,obj) {
   9         try {
  10                 if (obj) {
  11                         if (typeof(file)=='string') file = get_file( file );
  12                         var f = create_output_stream(file);
  13                         var obj_json = js2JSON( obj );
  14                         f.write( obj_json, String( obj_json ).length ); f.close();
  15                 } else {
  16                         throw('Tried setting obj = ' + obj + '\n');
  17                 }
  18         } catch(E) {
  19                 sdump('D_FILE', 'set_object_in_file: ' + js2JSON(E) + '\n');
  20                 throw(E);
  21         }
  22 }
  23
  24 function get_object_in_file(file) {
  25         try {
  26                 if (typeof(file)=='string') file = get_file( file );
  27                 if (file.exists()) {
  28                         var f = create_input_stream(file);
  29                         var data = f.read(-1);
  30                         var obj = JSON2js( data );
  31                         f.close();
  32                         return obj;
  33                 } else {
  34                         throw('File does not exist. ');
  35                 }
  36         } catch(E) {
  37                 sdump('D_FILE', 'get_object_in_file: ' + js2JSON(E) + '\n');
  38                 throw(E);
  39         }
  40 }
  41
  42 //////////////////////////////////////////////////////////////////////////////////////////////////////
  43
  44 function create_input_stream(file) {
  45         try {
  46                 if (typeof(file)=='string') file = get_file( file );
  47                 var f = Components.classes["@mozilla.org/network/file-input-stream;1"]
  48                         .createInstance(Components.interfaces.nsIFileInputStream);
  49                 if (file && file.exists()) {
  50                         f.init(file, 0x01, 0, 0);
  51                         var s = Components.classes["@mozilla.org/scriptableinputstream;1"]
  52                                 .createInstance(Components.interfaces.nsIScriptableInputStream);
  53                         if (f) {
  54                                 s.init(f);
  55                                 return s;
  56                         }
  57                 }
  58         } catch(E) {
  59                 sdump('D_ERROR', E);
  60         }
  61         return null;
  62 }
  63
  64 function create_output_stream(file) {
  65         try {
  66                 if (typeof(file)=='string') file = get_file( file );
  67                 var f = Components.classes["@mozilla.org/network/file-output-stream;1"]
  68                         .createInstance(Components.interfaces.nsIFileOutputStream);
  69                 if (file) {
  70                         if (! file.exists()) file.create( 0, 0640 );
  71                         f.init(file, 0x02 | 0x08 | 0x20, 0644, 0);
  72                         return f;
  73                 }
  74         } catch(E) {
  75                 sdump('D_ERROR', E);
  76         }
  77         return null;
  78 }
  79
  80 function get_file( fname ) {
  81         try {
  82                 file = dirService.get( "AChrom",  Components.interfaces.nsIFile );
  83                 file.append(mw.myPackageDir); file.append("content"); file.append("conf"); file.append(fname);
  84                 sdump('D_FILE','get_file( ' + fname + ').path = ' + file.path + '\n');
  85                 return file;
  86         } catch(E) {
  87                 sdump('D_ERROR', E);
  88                 return null;
  89         }
  90 }