mcs/class/System.Windows.Forms/System.Resources/ResXResourceReader.cs

   1 //
   2 // System.Resources.ResXResourceReader.cs
   3 //
   4 // Authors:
   5 //      Duncan Mak <duncan@ximian.com>
   6 //      Nick Drochak <ndrochak@gol.com>
   7 //      Paolo Molaro <lupus@ximian.com>
   8 //
   9 // 2001 (C) Ximian Inc, http://www.ximian.com
  10 //
  11 // TODO: Finish this
  12
  13 using System.Collections;
  14 using System.Resources;
  15 using System.IO;
  16 using System.Xml;
  17
  18 namespace System.Resources
  19 {
  20         public sealed class ResXResourceReader : IResourceReader, IDisposable
  21         {
  22                 Stream stream;
  23                 XmlTextReader reader;
  24                 Hashtable hasht;
  25
  26                 // Constructors
  27                 public ResXResourceReader (Stream stream)
  28                 {
  29                         if (stream == null)
  30                                 throw new ArgumentNullException ("Value cannot be null.");
  31
  32                         if (!stream.CanRead)
  33                                 throw new ArgumentException ("Stream was not readable.");
  34
  35                         this.stream = stream;
  36                         basic_setup ();
  37                 }
  38
  39                 public ResXResourceReader (string fileName)
  40                 {
  41                         stream = File.OpenRead (fileName);
  42                         basic_setup ();
  43                 }
  44
  45                 void basic_setup () {
  46                         reader = new XmlTextReader (stream);
  47                         hasht = new Hashtable ();
  48
  49                         if (!IsStreamValid()){
  50                                 throw new ArgumentException("Stream is not a valid .resx file!  It was possibly truncated.");
  51                         }
  52                         load_data ();
  53                 }
  54
  55                 static string get_attr (XmlTextReader reader, string name) {
  56                         if (!reader.HasAttributes)
  57                                 return null;
  58                         for (int i = 0; i < reader.AttributeCount; i++) {
  59                                 reader.MoveToAttribute (i);
  60                                 if (String.Compare (reader.Name, name, true) == 0) {
  61                                         string v = reader.Value;
  62                                         reader.MoveToElement ();
  63                                         return v;
  64                                 }
  65                         }
  66                         reader.MoveToElement ();
  67                         return null;
  68                 }
  69
  70                 static string get_value (XmlTextReader reader, string name) {
  71                         bool gotelement = false;
  72                         while (reader.Read ()) {
  73                                 if (reader.NodeType == XmlNodeType.Element && String.Compare (reader.Name, name, true) == 0) {
  74                                         gotelement = true;
  75                                         break;
  76                                 }
  77                         }
  78                         if (!gotelement)
  79                                 return null;
  80                         while (reader.Read ()) {
  81                                 if (reader.NodeType == XmlNodeType.Text || reader.NodeType == XmlNodeType.CDATA) {
  82                                         string v = reader.Value;
  83                                         return v;
  84                                 }
  85                                 else if (reader.NodeType == XmlNodeType.EndElement && reader.Value == string.Empty)
  86                                 {
  87                                         string v = reader.Value;
  88                                         return v;
  89                                 }
  90                         }
  91                         return null;
  92                 }
  93
  94                 private bool IsStreamValid() {
  95                         bool gotroot = false;
  96                         bool gotmime = false;
  97
  98                         while (reader.Read ()) {
  99                                 if (reader.NodeType == XmlNodeType.Element && String.Compare (reader.Name, "root", true) == 0) {
 100                                         gotroot = true;
 101                                         break;
 102                                 }
 103                         }
 104                         if (!gotroot)
 105                                 return false;
 106                         while (reader.Read ()) {
 107                                 if (reader.NodeType == XmlNodeType.Element && String.Compare (reader.Name, "resheader", true) == 0) {
 108                                         string v = get_attr (reader, "name");
 109                                         if (v != null && String.Compare (v, "resmimetype", true) == 0) {
 110                                                 v = get_value (reader, "value");
 111                                                 if (String.Compare (v, "text/microsoft-resx", true) == 0) {
 112                                                         gotmime = true;
 113                                                         break;
 114                                                 }
 115                                         }
 116                                 } else if (reader.NodeType == XmlNodeType.Element && String.Compare (reader.Name, "data", true) == 0) {
 117                                         /* resheader apparently can appear anywhere, so we collect
 118                                          * the data even if we haven't validated yet.
 119                                          */
 120                                         string n = get_attr (reader, "name");
 121                                         if (n != null) {
 122                                                 string v = get_value (reader, "value");
 123                                                 hasht [n] = v;
 124                                         }
 125                                 }
 126                         }
 127                         return gotmime;
 128                 }
 129
 130                 private void load_data ()
 131                 {
 132                         while (reader.Read ()) {
 133                                 if (reader.NodeType == XmlNodeType.Element && String.Compare (reader.Name, "data", true) == 0) {
 134                                         string n = get_attr (reader, "name");
 135                                         if (n != null) {
 136                                                 string v = get_value (reader, "value");
 137                                                 hasht [n] = v;
 138                                         }
 139                                 }
 140                         }
 141                 }
 142
 143                 public void Close ()
 144                 {
 145                         stream.Close ();
 146                         stream = null;
 147                 }
 148
 149                 public IDictionaryEnumerator GetEnumerator () {
 150                         if (null == stream){
 151                                 throw new InvalidOperationException("ResourceReader is closed.");
 152                         }
 153                         else {
 154                                 return hasht.GetEnumerator ();
 155                         }
 156                 }
 157
 158                 IEnumerator IEnumerable.GetEnumerator ()
 159                 {
 160                         return ((IResourceReader) this).GetEnumerator();
 161                 }
 162
 163                 [MonoTODO]
 164                 void IDisposable.Dispose ()
 165                 {
 166                         // FIXME: is this all we need to do?
 167                         Close();
 168                 }
 169
 170         }  // public sealed class ResXResourceReader
 171 } // namespace System.Resources