Mono.Zeroconf – Blame information for rev 2
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1 | office | 1 | // |
2 | // ProviderFactory.cs |
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3 | // |
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4 | // Authors: |
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5 | // Aaron Bockover <abockover@novell.com> |
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6 | // |
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7 | // Copyright (C) 2006-2007 Novell, Inc (http://www.novell.com) |
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8 | // |
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9 | // Permission is hereby granted, free of charge, to any person obtaining |
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10 | // a copy of this software and associated documentation files (the |
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11 | // "Software"), to deal in the Software without restriction, including |
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12 | // without limitation the rights to use, copy, modify, merge, publish, |
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13 | // distribute, sublicense, and/or sell copies of the Software, and to |
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14 | // permit persons to whom the Software is furnished to do so, subject to |
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15 | // the following conditions: |
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16 | // |
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17 | // The above copyright notice and this permission notice shall be |
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18 | // included in all copies or substantial portions of the Software. |
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19 | // |
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20 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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21 | // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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22 | // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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23 | // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
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24 | // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
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25 | // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
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26 | // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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27 | // |
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28 | |||
29 | using System; |
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30 | using System.IO; |
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31 | using System.Reflection; |
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32 | using System.Collections.Generic; |
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33 | |||
34 | namespace Mono.Zeroconf.Providers |
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35 | { |
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36 | internal static class ProviderFactory |
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37 | { |
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38 | private static IZeroconfProvider [] providers; |
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39 | private static IZeroconfProvider selected_provider; |
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40 | |||
41 | private static IZeroconfProvider DefaultProvider { |
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42 | get { |
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43 | if(providers == null) { |
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44 | GetProviders(); |
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45 | } |
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46 | |||
47 | return providers[0]; |
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48 | } |
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49 | } |
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50 | |||
51 | public static IZeroconfProvider SelectedProvider { |
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52 | get { return selected_provider == null ? DefaultProvider : selected_provider; } |
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53 | set { selected_provider = value; } |
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54 | } |
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55 | |||
56 | private static IZeroconfProvider [] GetProviders() |
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57 | { |
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58 | if(providers != null) { |
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59 | return providers; |
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60 | } |
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61 | |||
62 | List<IZeroconfProvider> providers_list = new List<IZeroconfProvider>(); |
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63 | List<string> directories = new List<string>(); |
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64 | Assembly asm = Assembly.GetExecutingAssembly(); |
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65 | |||
66 | string env_path = Environment.GetEnvironmentVariable("MONO_ZEROCONF_PROVIDERS"); |
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67 | if(!String.IsNullOrEmpty(env_path)) { |
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68 | foreach(string path in env_path.Split(':')) { |
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69 | if(Directory.Exists(path)) { |
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70 | directories.Add(path); |
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71 | } |
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72 | } |
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73 | } |
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74 | |||
75 | string this_asm_path = asm.Location; |
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76 | directories.Add(Path.GetDirectoryName(this_asm_path)); |
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77 | |||
78 | if(Assembly.GetExecutingAssembly().GlobalAssemblyCache) { |
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79 | string [] path_parts = directories[0].Split(Path.DirectorySeparatorChar); |
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80 | string new_path = Path.DirectorySeparatorChar.ToString(); |
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81 | string root = Path.GetPathRoot (this_asm_path); |
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82 | if (root.StartsWith (path_parts[0])) { |
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83 | path_parts[0] = root; |
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84 | } |
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85 | |||
86 | for(int i = 0; i < path_parts.Length - 4; i++) { |
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87 | new_path = Path.Combine(new_path, path_parts[i]); |
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88 | } |
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89 | |||
90 | directories.Add(Path.Combine(new_path, "mono-zeroconf")); |
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91 | } |
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2 | office | 92 | |
93 | try |
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94 | { |
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95 | foreach (string directory in directories) |
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96 | { |
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97 | foreach (string file in Directory.GetFiles(directory, "Mono.Zeroconf.Providers.*.dll")) |
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98 | { |
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99 | if (Path.GetFileName(file) != Path.GetFileName(this_asm_path)) |
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100 | { |
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101 | Assembly provider_asm = Assembly.LoadFile(file); |
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102 | foreach (Attribute attr in provider_asm.GetCustomAttributes(false)) |
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103 | { |
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104 | if (attr is ZeroconfProviderAttribute) |
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105 | { |
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106 | Type type = (attr as ZeroconfProviderAttribute).ProviderType; |
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107 | IZeroconfProvider provider = (IZeroconfProvider) Activator.CreateInstance(type); |
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108 | try |
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109 | { |
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110 | provider.Initialize(); |
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111 | providers_list.Add(provider); |
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112 | } |
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113 | catch (Exception e) |
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114 | { |
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115 | Console.WriteLine(e); |
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116 | } |
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1 | office | 117 | } |
118 | } |
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119 | } |
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120 | } |
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121 | } |
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122 | } |
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2 | office | 123 | catch |
124 | { |
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125 | // Could not load a provider. |
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126 | } |
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127 | |||
1 | office | 128 | if(providers_list.Count == 0) { |
129 | throw new Exception("No Zeroconf providers could be found or initialized. Necessary daemon may not be running."); |
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130 | } |
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131 | |||
132 | providers = providers_list.ToArray(); |
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133 | |||
134 | return providers; |
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135 | } |
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136 | } |
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137 | } |