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source: trunk/sources/HeuristicLab.MainForm/3.2/MainFormManager.cs @ 3278

Last change on this file since 3278 was 3278, checked in by mkommend, 14 years ago

removed unnecessary lines in MainFormManager (ticket #958)

File size: 9.1 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        Type defaultViewType = null;
91        try {
92          defaultViewType = GetDefaultViewType(contentType);
93        }
94        catch (InvalidOperationException) { }
95
96        foreach (Type viewType in viewTypes.ToList()) {
97          if ((viewType != defaultViewType) && viewTypes.Any(t => t.IsSubclassOf(viewType)))
98            viewTypes.Remove(viewType);
99        }
100      }
101      return viewTypes;
102    }
103
104    public static bool ViewCanViewObject(IView view, object content) {
105      return ContentAttribute.CanViewType(view.GetType(), content.GetType());
106    }
107
108    public static Type GetDefaultViewType(Type contentType) {
109      //check base classes for default view
110      Type type = contentType;
111      while (type != null) {
112        //check classes
113        foreach (Type defaultContentType in defaultViews.Keys) {
114          if (type == defaultContentType || type.CheckGenericTypes(defaultContentType))
115            return TransformGenericTypeDefinition(defaultViews[defaultContentType], contentType);
116        }
117
118        //check interfaces
119        IEnumerable<Type> nonInheritedInterfaces = type.GetInterfaces().Where(i => !i.IsAssignableFrom(type.BaseType));
120        List<Type> defaultViewList = new List<Type>();
121        foreach (Type defaultContentType in defaultViews.Keys) {
122          if (nonInheritedInterfaces.Contains(defaultContentType) || nonInheritedInterfaces.Any(i => i.CheckGenericTypes(defaultContentType)))
123            defaultViewList.Add(defaultViews[defaultContentType]);
124        }
125
126        //return only most spefic view as default view
127        foreach (Type viewType in defaultViewList.ToList()) {
128          if (defaultViewList.Any(t => t.IsSubclassOf(viewType)))
129            defaultViewList.Remove(viewType);
130        }
131
132        if (defaultViewList.Count == 1)
133          return TransformGenericTypeDefinition(defaultViewList[0], contentType);
134        else if (defaultViewList.Count > 1)
135          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.");
136
137        type = type.BaseType;
138      }
139
140      return null;
141    }
142
143    public static IView CreateDefaultView(object content) {
144      Type t = GetDefaultViewType(content.GetType());
145      if (t == null)
146        return null;
147
148      return (IView)Activator.CreateInstance(t, content);
149    }
150
151    public static IView CreateView(Type viewType) {
152      if (!typeof(IView).IsAssignableFrom(viewType))
153        throw new ArgumentException("View can not be created becaues given type " + viewType.ToString() + " is not of type IView.");
154      if (viewType.IsGenericTypeDefinition)
155        throw new ArgumentException("View can not be created becaues given type " + viewType.ToString() + " is a generic type definition.");
156
157      return (IView)Activator.CreateInstance(viewType);
158    }
159
160    public static IView CreateView(Type viewType, object content) {
161      if (!typeof(IView).IsAssignableFrom(viewType))
162        throw new ArgumentException("View can not be created becaues given type " + viewType.ToString() + " is not of type IView.");
163      Type view = viewType;
164      if (view.IsGenericTypeDefinition)
165        view = TransformGenericTypeDefinition(view, content.GetType());
166
167      return (IView)Activator.CreateInstance(view, content);
168    }
169
170    private static Type TransformGenericTypeDefinition(Type viewType, Type contentType) {
171      if (contentType.IsGenericTypeDefinition)
172        throw new ArgumentException("The content type " + contentType.ToString() + " must not be a generic type definition.");
173
174      if (!viewType.IsGenericTypeDefinition)
175        return viewType;
176
177      Type contentTypeBaseType = null;
178      foreach (Type type in ContentAttribute.GetViewableTypes(viewType)) {
179        contentTypeBaseType = contentType;
180        while (contentTypeBaseType != null && (!contentTypeBaseType.IsGenericType ||
181              type.GetGenericTypeDefinition() != contentTypeBaseType.GetGenericTypeDefinition()))
182          contentTypeBaseType = contentTypeBaseType.BaseType;
183
184        //check interfaces for generic type arguments
185        if (contentTypeBaseType == null) {
186          IEnumerable<Type> implementedInterfaces = contentType.GetInterfaces().Where(t => t.IsGenericType);
187          foreach (Type implementedInterface in implementedInterfaces) {
188            if (implementedInterface.CheckGenericTypes(type))
189              contentTypeBaseType = implementedInterface;
190          }
191        }
192        if (contentTypeBaseType != null) break;
193      }
194
195      if (!contentTypeBaseType.IsGenericType)
196        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.");
197
198      Type[] viewTypeGenericArguments = viewType.GetGenericArguments();
199      Type[] contentTypeGenericArguments = contentTypeBaseType.GetGenericArguments();
200
201      if (contentTypeGenericArguments.Length != viewTypeGenericArguments.Length)
202        throw new ArgumentException("Neiter the type (" + contentType.ToString() + ") nor any of its base types specifies " +
203          viewTypeGenericArguments.Length + " generic type arguments.");
204
205      for (int i = 0; i < viewTypeGenericArguments.Length; i++) {
206        foreach (Type typeConstraint in viewTypeGenericArguments[i].GetGenericParameterConstraints()) {
207          if (!typeConstraint.IsAssignableFrom(contentTypeGenericArguments[i]))
208            return null;
209        }
210      }
211
212      Type returnType = viewType.MakeGenericType(contentTypeGenericArguments);
213      return returnType;
214    }
215  }
216}
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