AggregateException.cs

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// AggregateException.cs
//
// Copyright (c) 2008 Jérémie "Garuma" Laval
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//

#if NET_4_0
using System;
using System.Collections.ObjectModel;
using System.Collections.Generic;
using System.Runtime.Serialization;

namespace System
{

    [System.SerializableAttribute]
    [System.Diagnostics.DebuggerDisplay ("Count = {InnerExceptions.Count}")]
    public class AggregateException : Exception
    {
        List<Exception> innerExceptions = new List<Exception> ();
        const string defaultMessage = "One or more errors occured";
        
        public AggregateException () : base (defaultMessage)
        {
        }
        
        public AggregateException (string message): base (message)
        {
        }
        
        public AggregateException (string message, Exception innerException): base (message, innerException)
        {
            if (innerException == null)
                throw new ArgumentNullException ("innerException");
            innerExceptions.Add (innerException);
        }
        
        protected AggregateException (SerializationInfo info, StreamingContext context)
            : base (info, context)
        {
        }
        
        public AggregateException (params Exception[] innerExceptions)
            : this (string.Empty, innerExceptions)
        {
        }
        
        public AggregateException (string message, params Exception[] innerExceptions)
            : base (message, innerExceptions == null || innerExceptions.Length == 0 ? null : innerExceptions[0])
        {
            if (innerExceptions == null)
                throw new ArgumentNullException ("innerExceptions");
            foreach (var exception in innerExceptions)
                if (exception == null)
                    throw new ArgumentException ("One of the inner exception is null", "innerExceptions");

            this.innerExceptions.AddRange (innerExceptions);
        }
        
        public AggregateException (IEnumerable<Exception> innerExceptions)
            : this (defaultMessage, innerExceptions)
        {
        }
        
        public AggregateException (string message, IEnumerable<Exception> innerExceptions)
            : this (message, new List<Exception> (innerExceptions).ToArray ())
        {
        }
        
        public AggregateException Flatten ()
        {
            List<Exception> inner = new List<Exception> ();
            
            foreach (Exception e in innerExceptions) {
                AggregateException aggEx = e as AggregateException;
                if (aggEx != null) {
                    inner.AddRange (aggEx.Flatten ().InnerExceptions);
                } else {
                    inner.Add (e);
                }               
            }

            return new AggregateException (inner);
        }
        
        public void Handle (Func<Exception, bool> predicate)
        {
            List<Exception> failed = new List<Exception> ();
            foreach (var e in innerExceptions) {
                // Spicy Pixel: Mono is wrong here. 
                // Bug filed: https://bugzilla.xamarin.com/show_bug.cgi?id=11867
                //
                // This is what MSDN says:
                //
                // http://msdn.microsoft.com/en-us/library/system.aggregateexception.handle.aspx
                // If any invocations of the predicate throws an exception, it will 
                // halt the processing of any more exceptions and immediately propagate 
                // the thrown exception as-is.
                //try {
                    if (!predicate (e))
                        failed.Add (e);
                //} catch {
                //  throw new AggregateException (failed);
                //}
            }
            if (failed.Count > 0)
                throw new AggregateException (failed);
        }
        
        public ReadOnlyCollection<Exception> InnerExceptions {
            get {
                return innerExceptions.AsReadOnly ();
            }
        }

        internal void AddChildException (AggregateException childEx)
        {
            if (innerExceptions == null)
                innerExceptions = new List<Exception> ();
            if (childEx == null)
                return;

            innerExceptions.Add (childEx);
        }
        
        public override string ToString ()
        {
            System.Text.StringBuilder finalMessage = new System.Text.StringBuilder (base.ToString ());

            int currentIndex = -1;
            foreach (Exception e in innerExceptions) {
                finalMessage.Append (Environment.NewLine);
                finalMessage.Append (" --> (Inner exception ");
                finalMessage.Append (++currentIndex);
                finalMessage.Append (") ");
                finalMessage.Append (e.ToString ());
                finalMessage.Append (Environment.NewLine);
            }
            return finalMessage.ToString ();
        }

        public override void GetObjectData (SerializationInfo info, StreamingContext context)
        {
            if (info == null) {
                throw new ArgumentNullException("info");
            }
            base.GetObjectData(info, context);
            info.AddValue ("InnerExceptions", innerExceptions.ToArray(), typeof (Exception[]));
        }

        public override Exception GetBaseException ()
        {
            if (innerExceptions == null || innerExceptions.Count == 0)
                return this;
            return innerExceptions[0].GetBaseException ();
        }
    }
}
#endif