Util/UriFu.cs

   1 //
   2 // UriFu.cs
   3 //
   4 // Copyright (C) 2004 Novell, Inc.
   5 //
   6
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a copy
   9 // of this software and associated documentation files (the "Software"), to deal
  10 // in the Software without restriction, including without limitation the rights
  11 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12 // copies of the Software, and to permit persons to whom the Software is
  13 // furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in all
  16 // copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24 // SOFTWARE.
  25 //
  26
  27 using System;
  28 using System.Collections;
  29 using System.Text;
  30
  31 namespace Beagle.Util {
  32
  33         public class UriFu {
  34
  35                 private UriFu () { } // class is static
  36
  37                 static public Uri PathToFileUri (string path)
  38                 {
  39                         string uriStr = StringFu.PathToQuotedFileUri (path);
  40                         return new Uri (uriStr, true);
  41                 }
  42
  43                 static public Uri UriStringToUri (string path)
  44                 {
  45                         // Our current hackery attempts to serialize Uri strings in
  46                         // escaped and constructable form, so we don't require any
  47                         // extra processing on deserialization right now.
  48                         return new Uri (path, true);
  49                 }
  50
  51                 static public String UriToSerializableString (Uri uri)
  52                 {
  53                         int i;
  54                         string path;
  55                         StringBuilder builder = new StringBuilder ();
  56
  57                         if (uri.IsFile)
  58                                 path = Uri.UriSchemeFile + Uri.SchemeDelimiter
  59                                         + StringFu.HexEscape (uri.LocalPath);
  60                         else
  61                                 path = uri.ToString ();
  62
  63                         // XmlSerializer is happy to serialize 'odd' characters, but doesn't
  64                         // like to deserialize them. So we encode all 'odd' characters now.
  65                         for (i = 0; i < path.Length; i++)
  66                                 if ((path [i] < '!') || (path [i] > '~' && path [i] < 256))
  67                                         builder.Append (Uri.HexEscape (path [i]));
  68                                 else
  69                                         builder.Append (path [i]);
  70
  71                         if (uri.IsFile)
  72                                 builder.Append (uri.Fragment);
  73
  74                         return builder.ToString ();
  75                 }
  76
  77                 static public String LocalPathFromUri (Uri uri)
  78                 {
  79                         if (uri == null)
  80                                 return "";
  81                         // FIXME: Can we assume "a directory", if it is not a file?
  82                         // If so, return the path of that directory.
  83                         if (uri.IsFile)
  84                                 return uri.LocalPath;
  85                         else
  86                                 return "";
  87                 }
  88
  89                 //////////////////////////////////
  90
  91                 static public bool Equals (Uri uri1, Uri uri2)
  92                 {
  93                         return uri1.ToString () == uri2.ToString ();
  94                 }
  95
  96                 static public int Compare (Uri uri1, Uri uri2)
  97                 {
  98                         return String.Compare (uri1.ToString (), uri2.ToString ());
  99                 }
 100
 101                 //////////////////////////////////
 102
 103                 public class Comparer : IComparer
 104                 {
 105                         public int Compare(object uri1, object uri2)
 106                         {
 107                                 return String.Compare(uri1.ToString(), uri2.ToString());
 108                         }
 109                 }
 110
 111                 public class Hasher : IHashCodeProvider
 112                 {
 113                         public int GetHashCode(object o)
 114                         {
 115                                 return o.ToString().GetHashCode();
 116                         }
 117                 }
 118
 119                 static Comparer the_comparer = new Comparer ();
 120                 static Hasher the_hasher = new Hasher ();
 121
 122                 // Returns a hash table that does the right thing when
 123                 // the key is a Uri.
 124                 static public Hashtable NewHashtable ()
 125                 {
 126                         return new Hashtable (the_hasher, the_comparer);
 127                 }
 128
 129                 //////////////////////////////////
 130
 131                 static public string UrisToString (ICollection list_of_uris)
 132                 {
 133                         StringBuilder sb = new StringBuilder ("!@#");
 134
 135                         foreach (Uri uri in list_of_uris) {
 136                                 sb.Append (" ");
 137                                 sb.Append (UriToSerializableString (uri).Replace (" ", "%20"));
 138                         }
 139
 140                         return sb.ToString ();
 141                 }
 142
 143                 static public ICollection StringToUris (string list_of_uris_as_string)
 144                 {
 145                         string [] parts = list_of_uris_as_string.Split (' ');
 146
 147                         if (parts.Length == 0 || parts [0] != "!@#")
 148                                 return null;
 149
 150                         ArrayList uri_array = new ArrayList ();
 151                         for (int i = 1; i < parts.Length; ++i) {
 152                                 try {
 153                                         Uri uri = UriStringToUri (parts [i]);
 154                                         uri_array.Add (uri);
 155                                 } catch (Exception ex) {
 156                                         Logger.Log.Debug ("Caught exception converting '{0}' to a Uri", parts [i]);
 157                                 }
 158                         }
 159
 160                         return uri_array;
 161
 162                 }
 163
 164         }
 165
 166 }