Free cookie consent management tool by TermsFeed Policy Generator

source: trunk/sources/HeuristicLab.MainForm/3.2/MainFormManager.cs @ 2992

Last change on this file since 2992 was 2992, checked in by mkommend, 13 years ago

overloaded GetViewTypes in MainFormManager(ticket #902)

File size: 8.5 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 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  public static class MainFormManager {
31    private static object locker;
32    private static IMainForm mainform;
33    private static HashSet<Type> views;
34    private static Dictionary<Type, Type> defaultViews;
35
36    static MainFormManager() {
37      locker = new object();
38      mainform = null;
39      views = new HashSet<Type>();
40      defaultViews = new Dictionary<Type, Type>();
41    }
42
43    public static void RegisterMainForm(IMainForm mainForm) {
44      lock (locker) {
45        if (MainFormManager.mainform != null)
46          throw new ArgumentException("A mainform was already associated with the mainform manager.");
47        if (mainForm == null)
48          throw new ArgumentException("Could not associate null as a mainform in the mainform manager.");
49
50        MainFormManager.mainform = mainForm;
51        IEnumerable<Type> types =
52          from t in ApplicationManager.Manager.GetTypes(typeof(IView))
53          where !t.IsAbstract && !t.IsInterface && ContentAttribute.HasContentAttribute(t)
54          select t;
55
56        foreach (Type viewType in types) {
57          views.Add(viewType);
58          foreach (Type contentType in ContentAttribute.GetDefaultViewableTypes(viewType)) {
59            if (defaultViews.ContainsKey(contentType))
60              throw new ArgumentException("DefaultView for type " + contentType + " is " + defaultViews[contentType] +
61                ". Can't register additional DefaultView " + viewType + ".");
62            defaultViews[contentType] = viewType;
63          }
64        }
65      }
66    }
67
68    public static IMainForm MainForm {
69      get { return mainform; }
70    }
71
72    public static T GetMainForm<T>() where T : IMainForm {
73      return (T)mainform;
74    }
75
76    public static IEnumerable<Type> GetViewTypes(Type contentType) {
77      List<Type> viewTypes = (from v in views
78                              where ContentAttribute.CanViewType(v, contentType)
79                              select v).ToList();
80      //transform generic type definitions to generic types
81      for (int i = 0; i < viewTypes.Count; i++) {
82        viewTypes[i] = TransformGenericTypeDefinition(viewTypes[i], contentType);
83      }
84      return viewTypes.Where(t => t != null);
85    }
86
87    public static IEnumerable<Type> GetViewTypes(Type contentType, bool returnOnlyMostSpecificViewTypes) {
88      List<Type> viewTypes = new List<Type>(GetViewTypes(contentType));
89      if (returnOnlyMostSpecificViewTypes) {
90        foreach (Type viewType in viewTypes.ToList()) {
91          if(viewTypes.Any(t => t.IsSubclassOf(viewType)))
92            viewTypes.Remove(viewType);
93        }
94      }
95      return viewTypes;
96    }
97
98    public static bool ViewCanViewObject(IView view, object content) {
99      return ContentAttribute.CanViewType(view.GetType(), content.GetType());
100    }
101
102    public static Type GetDefaultViewType(Type contentType) {
103      //check if viewableType has a default view
104      if (defaultViews.ContainsKey(contentType))
105        return defaultViews[contentType];
106
107      //check base classes for default view
108      Type type = contentType;
109      while (type != null) {
110        foreach (Type defaultContentType in defaultViews.Keys) {
111          if (type == defaultContentType || type.CheckGenericTypes(defaultContentType))
112            return TransformGenericTypeDefinition(defaultViews[defaultContentType], contentType);
113        }
114        type = type.BaseType;
115      }
116
117      //check if exactly one implemented interface has a default view
118      List<Type> temp = (from t in defaultViews.Keys
119                         where t.IsInterface && contentType.IsAssignableTo(t)
120                         select t).ToList();
121      if (temp.Count == 1)
122        return TransformGenericTypeDefinition(defaultViews[temp[0]], contentType);
123      //more than one default view for implemented interfaces are found
124      if (temp.Count > 1)
125        throw new InvalidOperationException("Could not determine which is the default view for type " + contentType.ToString() + ". Because more than one implemented interfaces have a default view.");
126      return null;
127    }
128
129    public static IView CreateDefaultView(object content) {
130      Type t = GetDefaultViewType(content.GetType());
131      if (t == null)
132        return null;
133
134      return (IView)Activator.CreateInstance(t, content);
135    }
136
137    public static IView CreateView(Type viewType) {
138      if (!typeof(IView).IsAssignableFrom(viewType))
139        throw new ArgumentException("View can not be created becaues given type " + viewType.ToString() + " is not of type IView.");
140      if (viewType.IsGenericTypeDefinition)
141        throw new ArgumentException("View can not be created becaues given type " + viewType.ToString() + " is a generic type definition.");
142
143      return (IView)Activator.CreateInstance(viewType);
144    }
145
146    public static IView CreateView(Type viewType, object content) {
147      if (!typeof(IView).IsAssignableFrom(viewType))
148        throw new ArgumentException("View can not be created becaues given type " + viewType.ToString() + " is not of type IView.");
149      Type view = viewType;
150      if (view.IsGenericTypeDefinition)
151        view = TransformGenericTypeDefinition(view, content.GetType());
152
153      return (IView)Activator.CreateInstance(view, content);
154    }
155
156    private static Type TransformGenericTypeDefinition(Type viewType, Type contentType) {
157      if (contentType.IsGenericTypeDefinition)
158        throw new ArgumentException("The content type " + contentType.ToString() + " must not be a generic type definition.");
159
160      if (!viewType.IsGenericTypeDefinition)
161        return viewType;
162
163      Type contentTypeBaseType = null;
164      foreach (Type type in ContentAttribute.GetViewableTypes(viewType)) {
165        contentTypeBaseType = contentType;
166        while (contentTypeBaseType != null && (!contentTypeBaseType.IsGenericType ||
167              type.GetGenericTypeDefinition() != contentTypeBaseType.GetGenericTypeDefinition()))
168          contentTypeBaseType = contentTypeBaseType.BaseType;
169
170        //check interfaces for generic type arguments
171        if (contentTypeBaseType == null) {
172          IEnumerable<Type> implementedInterfaces = contentType.GetInterfaces().Where(t => t.IsGenericType);
173          foreach (Type implementedInterface in implementedInterfaces) {
174            if (implementedInterface.CheckGenericTypes(type))
175              contentTypeBaseType = implementedInterface;
176          }
177        }
178        if (contentTypeBaseType != null) break;
179      }
180
181      if (!contentTypeBaseType.IsGenericType)
182        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.");
183
184      Type[] viewTypeGenericArguments = viewType.GetGenericArguments();
185      Type[] contentTypeGenericArguments = contentTypeBaseType.GetGenericArguments();
186
187      if (contentTypeGenericArguments.Length != viewTypeGenericArguments.Length)
188        throw new ArgumentException("Neiter the type (" + contentType.ToString() + ") nor any of its base types specifies " +
189          viewTypeGenericArguments.Length + " generic type arguments.");
190
191      for (int i = 0; i < viewTypeGenericArguments.Length; i++) {
192        foreach (Type typeConstraint in viewTypeGenericArguments[i].GetGenericParameterConstraints()) {
193          if (!typeConstraint.IsAssignableFrom(contentTypeGenericArguments[i]))
194            return null;
195        }
196      }
197
198      Type returnType = viewType.MakeGenericType(contentTypeGenericArguments);
199      return returnType;
200    }
201  }
202}
Note: See TracBrowser for help on using the repository browser.