Restructured for new direction.

Assets/Plugins/AssetUsageDetector/Editor/VariableGetter.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Reflection;
+using System.Text;
+using UnityEngine;
+
+namespace AssetUsageDetectorNamespace
+{
+	// Delegate to get the value of a variable (either field or property)
+	public delegate object VariableGetVal( object obj );
+
+	// Custom struct to hold a variable, its important properties and its getter function
+	public readonly struct VariableGetterHolder
+	{
+		public readonly MemberInfo variable;
+		private readonly VariableGetVal getter;
+
+		public readonly string Name { get { return variable.Name; } }
+		public readonly bool IsProperty { get { return variable is PropertyInfo; } }
+
+        public VariableGetterHolder(FieldInfo fieldInfo, VariableGetVal getter)
+        {
+            this.variable = fieldInfo;
+            this.getter = getter;
+        }
+
+        public VariableGetterHolder(PropertyInfo propertyInfo, VariableGetVal getter)
+        {
+            this.variable = propertyInfo;
+            this.getter = getter;
+        }
+
+		public readonly object Get( object obj )
+		{
+			try
+			{
+				return getter( obj );
+			}
+			catch( Exception e )
+			{
+				StringBuilder sb = Utilities.stringBuilder;
+				sb.Length = 0;
+				sb.Append( "Error while getting the value of (" ).Append( IsProperty ? ( (PropertyInfo) variable ).PropertyType : ( (FieldInfo) variable ).FieldType ).Append( ") " )
+					.Append( variable.DeclaringType ).Append( "." ).Append( Name ).Append( ": " ).Append( e );
+
+				Debug.LogError( sb.ToString() );
+				return null;
+			}
+		}
+	}
+
+	// Credit: http://stackoverflow.com/questions/724143/how-do-i-create-a-delegate-for-a-net-property
+	public interface IPropertyAccessor
+	{
+		object GetValue( object source );
+	}
+
+	// A wrapper class for properties to get their values more efficiently
+	public class PropertyWrapper<TObject, TValue> : IPropertyAccessor where TObject : class
+	{
+		private readonly Func<TObject, TValue> getter;
+
+		public PropertyWrapper( MethodInfo getterMethod )
+		{
+			getter = (Func<TObject, TValue>) Delegate.CreateDelegate( typeof( Func<TObject, TValue> ), getterMethod );
+		}
+
+		public object GetValue( object obj )
+		{
+			try
+			{
+				return getter( (TObject) obj );
+			}
+			catch
+			{
+				// Property getters may return various kinds of exceptions if their backing fields are not initialized (yet)
+				return null;
+			}
+		}
+	}
+}