CPF/CPF.Mac/Mac/CoreFoundation/CFException.cs

using CPF.Mac.Foundation;
using CPF.Mac.ObjCRuntime;
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;

namespace CPF.Mac.CoreFoundation
{
	public class CFException : Exception
	{
		public int Code
		{
			get;
			private set;
		}

		public NSString Domain
		{
			get;
			private set;
		}

		public string FailureReason
		{
			get;
			private set;
		}

		public string RecoverySuggestion
		{
			get;
			private set;
		}

		public CFException(string description, NSString domain, int code, string failureReason, string recoverySuggestion)
			: base(description)
		{
			Code = code;
			Domain = domain;
			FailureReason = failureReason;
			RecoverySuggestion = recoverySuggestion;
		}

		public static CFException FromCFError(IntPtr cfErrorHandle)
		{
			return FromCFError(cfErrorHandle, release: true);
		}

		public static CFException FromCFError(IntPtr cfErrorHandle, bool release)
		{
			if (cfErrorHandle == IntPtr.Zero)
			{
				throw new ArgumentException("cfErrorHandle must not be null.", "cfErrorHandle");
			}
			CFException ex = new CFException(ToString(CFErrorCopyDescription(cfErrorHandle)), (NSString)Runtime.GetNSObject(CFErrorGetDomain(cfErrorHandle)), CFErrorGetCode(cfErrorHandle), ToString(CFErrorCopyFailureReason(cfErrorHandle)), ToString(CFErrorCopyRecoverySuggestion(cfErrorHandle)));
			IntPtr intPtr = CFErrorCopyUserInfo(cfErrorHandle);
			if (intPtr != IntPtr.Zero)
			{
				using (NSDictionary nSDictionary = new NSDictionary(intPtr))
				{
					foreach (KeyValuePair<NSObject, NSObject> item in nSDictionary)
					{
						ex.Data.Add(item.Key, item.Value);
					}
				}
			}
			if (release)
			{
				CFObject.CFRelease(cfErrorHandle);
			}
			return ex;
		}

		private static string ToString(IntPtr cfStringRef)
		{
			return ToString(cfStringRef, release: true);
		}

		private static string ToString(IntPtr cfStringRef, bool release)
		{
			string result = CFString.FetchString(cfStringRef);
			if (release && cfStringRef != IntPtr.Zero)
			{
				CFObject.CFRelease(cfStringRef);
			}
			return result;
		}

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern IntPtr CFErrorCopyDescription(IntPtr err);

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern IntPtr CFErrorCopyFailureReason(IntPtr err);

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern IntPtr CFErrorCopyRecoverySuggestion(IntPtr err);

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern IntPtr CFErrorCopyUserInfo(IntPtr err);

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern int CFErrorGetCode(IntPtr err);

		[DllImport("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation")]
		private static extern IntPtr CFErrorGetDomain(IntPtr err);
	}
}