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Diffstat (limited to 'csharp/src/Google.Protobuf/Collections/Lists.cs')
| -rw-r--r-- | csharp/src/Google.Protobuf/Collections/Lists.cs | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/csharp/src/Google.Protobuf/Collections/Lists.cs b/csharp/src/Google.Protobuf/Collections/Lists.cs new file mode 100644 index 00000000..860795ce --- /dev/null +++ b/csharp/src/Google.Protobuf/Collections/Lists.cs @@ -0,0 +1,89 @@ +#region Copyright notice and license +// Protocol Buffers - Google's data interchange format +// Copyright 2017 Google Inc. All rights reserved. +// https://developers.google.com/protocol-buffers/ +// +// 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. +#endregion + +using System.Collections.Generic; +using System.Collections.ObjectModel; + +namespace Google.Protobuf.Collections +{ + /// <summary> + /// Utility to compare if two Lists are the same, and the hash code + /// of a List. + /// </summary> + public static class Lists + { + /// <summary> + /// Checks if two lists are equal. + /// </summary> + public static bool Equals<T>(List<T> left, List<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; + } + + /// <summary> + /// Gets the list's hash code. + /// </summary> + public static int GetHashCode<T>(List<T> list) + { + if (list == null) + { + return 0; + } + int hash = 31; + foreach (T element in list) + { + hash = hash * 29 + element.GetHashCode(); + } + return hash; + } + } +}
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