1 | using System;
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2 | using System.Diagnostics;
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3 | using System.IO;
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4 | using System.Reflection;
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5 | using System.Windows.Forms;
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6 |
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7 | namespace Netron.Diagramming.Core {
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8 | // ----------------------------------------------------------------------
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9 | /// <summary>
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10 | /// Contains a collection of shapes and handles loading shapes from
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11 | /// assemblies. This can also be serialized for later use.
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12 | /// </summary>
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13 | // ----------------------------------------------------------------------
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14 | public class Library {
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15 | // ------------------------------------------------------------------
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16 | /// <summary>
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17 | /// The collection of shapes for this library.
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18 | /// </summary>
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19 | // ------------------------------------------------------------------
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20 | CollectionBase<IShape> myShapes;
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21 |
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22 | // ------------------------------------------------------------------
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23 | /// <summary>
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24 | /// The name of this library.
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25 | /// </summary>
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26 | // ------------------------------------------------------------------
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27 | string myName = "Library";
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28 |
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29 | // ------------------------------------------------------------------
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30 | /// <summary>
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31 | /// The complete path to the assembly to load.
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32 | /// </summary>
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33 | // ------------------------------------------------------------------
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34 | string myPath = String.Empty;
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35 |
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36 | // ------------------------------------------------------------------
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37 | /// <summary>
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38 | /// Our assembly.
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39 | /// </summary>
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40 | // ------------------------------------------------------------------
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41 | Assembly assembly;
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42 |
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43 | // ------------------------------------------------------------------
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44 | /// <summary>
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45 | /// Gets or sets the name of this library.
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46 | /// </summary>
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47 | // ------------------------------------------------------------------
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48 | public string Name {
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49 | get {
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50 | return myName;
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51 | }
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52 | set {
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53 | myName = value;
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54 | }
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55 | }
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56 |
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57 | // ------------------------------------------------------------------
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58 | /// <summary>
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59 | /// Gets the shapes in the library.
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60 | /// </summary>
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61 | // ------------------------------------------------------------------
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62 | public CollectionBase<IShape> Shapes {
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63 | get {
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64 | return myShapes;
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65 | }
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66 | }
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67 |
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68 | // ------------------------------------------------------------------
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69 | /// <summary>
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70 | /// Constructor.
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71 | /// </summary>
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72 | // ------------------------------------------------------------------
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73 | public Library() {
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74 | this.myShapes = new CollectionBase<IShape>();
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75 | }
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76 |
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77 | // ------------------------------------------------------------------
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78 | /// <summary>
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79 | /// Returns if this library contains a shape with the GUID specified.
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80 | /// </summary>
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81 | /// <param name="guid"></param>
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82 | /// <returns></returns>
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83 | // ------------------------------------------------------------------
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84 | public bool ContainsShape(string guid) {
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85 | foreach (IShape shape in myShapes) {
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86 | if (shape.Uid.ToString() == guid) {
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87 | return true;
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88 | }
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89 | }
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90 | return false;
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91 | }
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92 |
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93 | // ------------------------------------------------------------------
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94 | /// <summary>
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95 | /// Creates a new instance of the shape with the GUID specified.
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96 | /// </summary>
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97 | /// <param name="guid">string</param>
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98 | /// <returns>IShape</returns>
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99 | // ------------------------------------------------------------------
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100 | public IShape CreateNewInstance(string guid) {
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101 | if ((assembly == null) ||
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102 | (guid == "") ||
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103 | (guid == String.Empty)) {
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104 | return null;
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105 | }
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106 |
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107 | string typeName = "";
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108 | foreach (IShape shape in myShapes) {
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109 | if (shape.Uid.ToString() == guid) {
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110 | typeName = shape.GetType().FullName;
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111 | IShape newInstance =
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112 | (IShape)assembly.CreateInstance(typeName);
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113 |
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114 | return newInstance;
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115 | }
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116 | }
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117 | return null;
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118 | }
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119 |
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120 | // ------------------------------------------------------------------
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121 | /// <summary>
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122 | /// Imports all shapes that have the "ShapeAttribute" attribute
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123 | /// from the assembly (i.e. "dll") specified.
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124 | /// </summary>
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125 | /// <param name="path">string: The complete path to the assembly to
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126 | /// load.</param>
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127 | // ------------------------------------------------------------------
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128 | public void Load(string path) {
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129 | try {
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130 | myPath = path;
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131 | Directory.SetCurrentDirectory(
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132 | Path.GetDirectoryName(Application.ExecutablePath));
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133 |
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134 | // Use the "LoadFile" option so the assembly is also loaded
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135 | // into the current domain. This is important!!!
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136 | assembly = Assembly.LoadFile(path);
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137 | if (assembly == null) {
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138 | return;
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139 | }
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140 |
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141 | // The assembly types.
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142 | Type[] types = assembly.GetTypes();
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143 |
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144 | if (types == null) {
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145 | return;
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146 | }
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147 |
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148 | IShape shapeInstance = null;
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149 | object[] objs;
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150 |
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151 | // Loop over all modules in the assembly and get all shapes
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152 | // that are marked with the attribute that indicates they're
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153 | // to be loaded into the library.
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154 | for (int k = 0; k < types.Length; k++) {
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155 | // It has to be a class to be a shape!
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156 | if (!types[k].IsClass) {
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157 | continue;
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158 | }
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159 |
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160 | objs = types[k].GetCustomAttributes(
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161 | typeof(ShapeAttribute), false);
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162 |
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163 | if (objs.Length < 1) {
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164 | // This module isn't a shape so go to the next one.
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165 | continue;
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166 | }
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167 |
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168 | // Now, we are sure to have a shape object.
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169 |
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170 | try {
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171 | // Normally you'd need the constructor passing the
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172 | // Model, but this instance will not actually live
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173 | // on the canvas and hence cause no problem.
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174 | // However, you do need a ctor with no parameters!
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175 | shapeInstance = (IShape)assembly.CreateInstance(
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176 | types[k].FullName);
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177 |
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178 | ShapeAttribute shapeAtts = objs[0] as ShapeAttribute;
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179 | this.myShapes.Add(shapeInstance);
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180 | //summary = new ShapeSummary(path, shapeAtts.Key,shapeAtts.Name, shapeAtts.ShapeCategory, shapeAtts.ReflectionName, shapeAtts.Description);
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181 | //library.ShapeSummaries.Add(summary);
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182 | }
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183 | catch (Exception exc) {
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184 | Trace.WriteLine(exc.Message, "An error occurred " +
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185 | "while creating a shape from type " +
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186 | types[k].FullName);
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187 | continue;
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188 | }
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189 | }
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190 |
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191 | // Now, set the name of this library to the assembly title.
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192 | foreach (Attribute attr in
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193 | Attribute.GetCustomAttributes(assembly)) {
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194 | // Check for the AssemblyTitle attribute.
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195 | if (attr.GetType() == typeof(AssemblyTitleAttribute)) {
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196 | this.myName = ((AssemblyTitleAttribute)attr).Title;
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197 | break;
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198 | }
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199 | }
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200 |
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201 | }
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202 | catch (Exception e) {
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203 | Trace.WriteLine(e.Message, "An error occurred while " +
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204 | "loading library from:\n" + path);
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205 | return;
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206 | }
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207 | }
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208 | }
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209 | }
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