source: trunk/sources/HeuristicLab.MainForm/3.2/MainFormManager.cs @ 2724

Last change on this file since 2724 was 2724, checked in by mkommend, 10 years ago

corrected handling of generic content types (ticket #857)

File size: 8.1 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 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.Collections.Generic;
24using System.Linq;
25using System.Text;
26using HeuristicLab.PluginInfrastructure;
27using System.Diagnostics;
28
29namespace HeuristicLab.MainForm {
30  class StringDict<T> : Dictionary<string, T> {
31  }
32  public static class MainFormManager {
33    private static object locker;
34    private static IMainForm mainform;
35    private static HashSet<Type> views;
36    private static Dictionary<Type, Type> defaultViews;
37
38    static MainFormManager() {
39      locker = new object();
40      views = new HashSet<Type>();
41      defaultViews = new Dictionary<Type, Type>();
42    }
43
44    public static void RegisterMainForm(IMainForm mainform) {
45      lock (locker) {
46        if (MainFormManager.mainform != null)
47          throw new ArgumentException("A mainform was already associated with the mainform manager.");
48        if (mainform == null)
49          throw new ArgumentException("Could not associate null as a mainform in the mainform manager.");
50
51        MainFormManager.mainform = mainform;
52        IEnumerable<Type> types =
53          from t in ApplicationManager.Manager.GetTypes(typeof(IView))
54          where !t.IsAbstract && !t.IsInterface && ContentAttribute.HasContentAttribute(t)
55          select t;
56
57        foreach (Type viewType in types) {
58          views.Add(viewType);
59          foreach (Type contentType in ContentAttribute.GetDefaultViewableTypes(viewType)) {
60            if (defaultViews.ContainsKey(contentType))
61              throw new ArgumentException("DefaultView for type " + contentType + " is " + defaultViews[contentType] +
62                ". Can't register additional DefaultView " + viewType + ".");
63            defaultViews[contentType] = viewType;
64          }
65        }
66      }
67    }
68
69    public static IMainForm MainForm {
70      get { return mainform; }
71    }
72
73    public static T GetMainForm<T>() where T : IMainForm {
74      return (T)mainform;
75    }
76
77    public static IEnumerable<Type> GetViewTypes(Type contentType) {
78      List<Type> viewTypes = (from v in views
79                              where ContentAttribute.CanViewType(v, contentType)
80                              select v).ToList();
81      //transform generic type definitions to generic types
82      for (int i = 0; i < viewTypes.Count; i++) {
83        viewTypes[i] = TransformGenericTypeDefinition(viewTypes[i], contentType);
84      }
85      return viewTypes;
86    }
87
88    public static bool ViewCanViewObject(IView view, object o) {
89      return ContentAttribute.CanViewType(view.GetType(), o.GetType());
90    }
91
92    public static Type GetDefaultViewType(Type contentType) {
93      //check if viewableType has a default view
94      if (defaultViews.ContainsKey(contentType))
95        return defaultViews[contentType];
96
97      //check base classes for default view
98      Type type = contentType;
99      while (type != null) {
100        foreach (Type defaultContentType in defaultViews.Keys) {
101          if (type == defaultContentType || type.CheckGenericTypes(defaultContentType))
102            return TransformGenericTypeDefinition(defaultViews[defaultContentType], contentType);
103        }
104        type = type.BaseType;
105      }
106
107      //check if exactly one implemented interface has a default view
108      List<Type> temp = (from t in defaultViews.Keys
109                         where t.IsInterface && contentType.IsAssignableTo(t)
110                         select t).ToList();
111      if (temp.Count == 1)
112        return TransformGenericTypeDefinition(defaultViews[temp[0]], contentType);
113      //more than one default view for implemented interfaces are found
114      if (temp.Count > 1)
115        throw new Exception("Could not determine which is the default view for type " + contentType.ToString() + ". Because more than one implemented interfaces have a default view.");
116      return null;
117    }
118
119    public static IView CreateDefaultView(object objectToView) {
120      Type t = GetDefaultViewType(objectToView.GetType());
121      if (t == null)
122        return null;
123
124      return (IView)Activator.CreateInstance(t, objectToView);
125    }
126
127    public static IView CreateView(Type viewType) {
128      if (!typeof(IView).IsAssignableFrom(viewType))
129        throw new ArgumentException("View can not be created becaues given type " + viewType.ToString() + " is not of type IView.");
130      if (viewType.IsGenericTypeDefinition)
131        throw new ArgumentException("View can not be created becaues given type " + viewType.ToString() + " is a generic type definition.");
132
133      return (IView)Activator.CreateInstance(viewType);
134    }
135
136    public static IView CreateView(Type viewType, object objectToView) {
137      if (!typeof(IView).IsAssignableFrom(viewType))
138        throw new ArgumentException("View can not be created becaues given type " + viewType.ToString() + " is not of type IView.");
139      if (viewType.IsGenericTypeDefinition)
140        throw new ArgumentException("View can not be created becaues given type " + viewType.ToString() + " is a generic type definition.");
141
142      return (IView)Activator.CreateInstance(viewType, objectToView);
143    }
144
145    private static Type TransformGenericTypeDefinition(Type viewType, Type contentType) {
146      if (contentType.IsGenericTypeDefinition)
147        throw new ArgumentException("The content type " + contentType.ToString() + " must not be a generic type definition.");
148
149      if (!viewType.IsGenericTypeDefinition)
150        return viewType;
151
152      Type contentTypeBaseType = contentType;
153      foreach (Type type in ContentAttribute.GetViewableTypes(viewType)) {
154        while (contentTypeBaseType != null && (!contentTypeBaseType.IsGenericType ||
155              type.GetGenericTypeDefinition() != contentTypeBaseType.GetGenericTypeDefinition()))
156          contentTypeBaseType = contentTypeBaseType.BaseType;
157
158        //check interfaces for generic type arguments
159        if (contentTypeBaseType == null) {
160          IEnumerable<Type> implementedInterfaces = contentType.GetInterfaces().Where(t => t.IsGenericType);
161          foreach (Type implementedInterface in implementedInterfaces) {
162            if (implementedInterface.CheckGenericTypes(viewType))
163              contentTypeBaseType = implementedInterface;
164          }
165        }
166      }
167
168      if (!contentTypeBaseType.IsGenericType)
169        throw new ArgumentException("Neither content type itself nor any of its base classes is a generic type. Could not determine generic type argument for the view.");
170
171      Type[] viewTypeGenericArguments = viewType.GetGenericArguments();
172      Type[] contentTypeGenericArguments = contentTypeBaseType.GetGenericArguments();
173
174      if (contentTypeGenericArguments.Length != viewTypeGenericArguments.Length)
175        throw new ArgumentException("Neiter the type (" + contentType.ToString() + ") nor any of its base types specifies " +
176          viewTypeGenericArguments.Length + " generic type arguments.");
177
178      for (int i = 0; i < viewTypeGenericArguments.Length; i++) {
179        foreach (Type typeConstraint in viewTypeGenericArguments[i].GetGenericParameterConstraints()) {
180          if (!typeConstraint.IsAssignableFrom(contentTypeGenericArguments[i]))
181            return null;
182        }
183      }
184
185      Type returnType = viewType.MakeGenericType(contentTypeGenericArguments);
186      return returnType;
187    }
188  }
189}
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