protobuf/csharp/src/ProtoGen/InvalidOptionsException.cs

#region Copyright notice and license

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// http://github.com/jskeet/dotnet-protobufs/
// Original C++/Java/Python code:
// http://code.google.com/p/protobuf/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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#endregion

using System;
using System.Collections.Generic;
using System.Text;
using Google.ProtocolBuffers.Collections;

namespace Google.ProtocolBuffers.ProtoGen
{
    /// <summary>
    /// Exception thrown to indicate that the options passed were invalid.
    /// </summary>
    public sealed class InvalidOptionsException : Exception
    {
        private readonly IList<string> reasons;

        /// <summary>
        /// An immutable list of reasons why the options were invalid.
        /// </summary>
        public IList<string> Reasons
        {
            get { return reasons; }
        }

        public InvalidOptionsException(IList<string> reasons)
            : base(BuildMessage(reasons))
        {
            this.reasons = Lists.AsReadOnly(reasons);
        }

        private static string BuildMessage(IEnumerable<string> reasons)
        {
            StringBuilder builder = new StringBuilder("Invalid options:");
            builder.AppendLine();
            foreach (string reason in reasons)
            {
                builder.Append("  ");
                builder.AppendLine(reason);
            }
            return builder.ToString();
        }
    }
}