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source: trunk/sources/HeuristicLab.Persistence/3.3/Auxiliary/TypeLoader.cs @ 8641

Last change on this file since 8641 was 8641, checked in by ascheibe, 10 years ago

#1952 (#1937) added Mono support to persistence

File size: 5.9 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Reflection;
24using HeuristicLab.Persistence.Core;
25using HeuristicLab.Tracing;
26
27namespace HeuristicLab.Persistence.Auxiliary {
28  internal class TypeLoader {
29    public static Type Load(string typeNameString) {
30      try {
31        // try to load type normally
32        return LoadInternal(typeNameString);
33      }
34      catch (PersistenceException) {
35        #region Mono Compatibility
36        // if that fails, try to load Mono type
37        string monoTypeNameString = GetMonoType(typeNameString);
38        Logger.Info(String.Format(@"Trying to load Mono type ""{0}"" instead of type ""{1}""",
39                                  monoTypeNameString, typeNameString));
40        return LoadInternal(monoTypeNameString);
41      }
42        #endregion
43    }
44
45    private static Type LoadInternal(string typeNameString) {
46      Type type;
47      try {
48        type = Type.GetType(typeNameString, true);
49        #region Mono Compatibility
50        // mono: workaround until Mono bug #580 (http://bugzilla.xamarin.com/show_bug.cgi?id=580) is fixed
51        if (type.AssemblyQualifiedName != typeNameString)
52          throw new TypeLoadException(
53            String.Format(
54            @"Could not load requested type ""{0}"", loaded ""{1}"" instead.",
55            typeNameString, type.AssemblyQualifiedName));
56        #endregion
57      }
58      catch (Exception) {
59        Logger.Warn(String.Format(
60          "Cannot load type \"{0}\", falling back to partial name", typeNameString));
61        type = LoadWithPartialName(typeNameString);
62        CheckCompatibility(typeNameString, type);
63      }
64      return type;
65    }
66
67    private static Type LoadWithPartialName(string typeNameString) {
68      try {
69        TypeName typeName = TypeNameParser.Parse(typeNameString);
70#pragma warning disable 0618
71        Assembly a = Assembly.LoadWithPartialName(typeName.AssemblyName);
72        // the suggested Assembly.Load() method fails to load assemblies outside the GAC
73#pragma warning restore 0618
74        return a.GetType(typeName.ToString(false, false), true);
75      }
76      catch (Exception) {
77        throw new PersistenceException(String.Format(
78          "Could not load type \"{0}\"",
79          typeNameString));
80      }
81    }
82
83    private static void CheckCompatibility(string typeNameString, Type type) {
84      try {
85        TypeName requestedTypeName = TypeNameParser.Parse(typeNameString);
86        TypeName loadedTypeName = TypeNameParser.Parse(type.AssemblyQualifiedName);
87        if (!requestedTypeName.IsCompatible(loadedTypeName))
88          throw new PersistenceException(String.Format(
89            "Serialized type is incompatible with available type: serialized: {0}, loaded: {1}",
90            typeNameString,
91            type.AssemblyQualifiedName));
92        if (requestedTypeName.IsNewerThan(loadedTypeName))
93          throw new PersistenceException(String.Format(
94            "Serialized type is newer than available type: serialized: {0}, loaded: {1}",
95            typeNameString,
96            type.AssemblyQualifiedName));
97      }
98      catch (PersistenceException) {
99        throw;
100      }
101      catch (Exception e) {
102        Logger.Warn(String.Format(
103          "Could not perform version check requested type was {0} while loaded type is {1}:",
104          typeNameString,
105          type.AssemblyQualifiedName),
106                    e);
107      }
108    }
109
110    #region Mono Compatibility
111    /// <summary>
112    /// Returns the corresponding type for the Mono runtime
113    /// </summary>
114    /// <returns>
115    /// The remapped typeNameString, or the original string if no mapping was found
116    /// </returns>
117    private static string GetMonoType(string typeNameString) {
118      TypeName typeName = TypeNameParser.Parse(typeNameString);
119
120      // map System.RuntimeType to System.MonoType
121      if (typeName.Namespace == "System" && typeName.ClassName == "RuntimeType") {
122        // we use Int32 here because we get all the information about Mono's mscorlib and just have to change the class name
123        typeName = TypeNameParser.Parse(typeof(System.Int32).AssemblyQualifiedName);
124        typeName.ClassName = "MonoType";
125      } else if (typeName.Namespace == "System.Collections.Generic" && typeName.ClassName == "ObjectEqualityComparer") {
126        // map System.Collections.Generic.ObjectEqualityComparer to HeuristicLab.Mono.ObjectEqualityComparer       
127        // we need the information about the Persistence assembly, so we use TypeName here because it is contained in this assembly
128        TypeName oecInfo = TypeNameParser.Parse(typeof(TypeName).AssemblyQualifiedName);
129        typeName.Namespace = "HeuristicLab.Persistence.Mono";
130        typeName.AssemblyName = oecInfo.AssemblyName;
131        typeName.AssemblyAttribues.Clear();
132        typeName.AssemblyAttribues["Version"] = oecInfo.AssemblyAttribues["Version"];
133        typeName.AssemblyAttribues["Culture"] = oecInfo.AssemblyAttribues["Culture"];
134        typeName.AssemblyAttribues["PublicKeyToken"] = oecInfo.AssemblyAttribues["PublicKeyToken"];
135      }
136
137      return typeName.ToString(true, true);
138    }
139    #endregion
140  }
141}
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