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// 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
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
using System.Collections.Generic;
using System.Collections.ObjectModel;
namespace Google.ProtocolBuffers.Collections
{
/// <summary>
/// Utility non-generic class for calling into Lists{T} using type inference.
/// </summary>
public static class Lists
{
/// <summary>
/// Returns a read-only view of the specified list.
/// </summary>
public static IList<T> AsReadOnly<T>(IList<T> list)
{
return Lists<T>.AsReadOnly(list);
}
public static bool Equals<T>(IList<T> left, IList<T> right)
{
if (left == right)
{
return true;
}
if (left == null || right == null)
{
return false;
}
if (left.Count != right.Count)
{
return false;
}
IEqualityComparer<T> comparer = EqualityComparer<T>.Default;
for (int i = 0; i < left.Count; i++)
{
if (!comparer.Equals(left[i], right[i]))
{
return false;
}
}
return true;
}
public static int GetHashCode<T>(IList<T> list)
{
int hash = 31;
foreach (T element in list)
{
hash = hash*29 + element.GetHashCode();
}
return hash;
}
}
/// <summary>
/// Utility class for dealing with lists.
/// </summary>
public static class Lists<T>
{
private static readonly ReadOnlyCollection<T> empty = new ReadOnlyCollection<T>(new T[0]);
/// <summary>
/// Returns an immutable empty list.
/// </summary>
public static ReadOnlyCollection<T> Empty
{
get { return empty; }
}
/// <summary>
/// Returns either the original reference if it's already read-only,
/// or a new ReadOnlyCollection wrapping the original list.
/// </summary>
public static IList<T> AsReadOnly(IList<T> list)
{
return list.IsReadOnly ? list : new ReadOnlyCollection<T>(list);
}
}
}
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