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// Licensed to the Apache Software Foundation(ASF) under one
// or more contributor license agreements.See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
using System.Collections;
namespace Thrift.Collections
{
// ReSharper disable once InconsistentNaming
public class TCollections
{
/// <summary>
/// This will return true if the two collections are value-wise the same.
/// If the collection contains a collection, the collections will be compared using this method.
/// </summary>
public static bool Equals(IEnumerable first, IEnumerable second)
{
if (first == null && second == null)
{
return true;
}
if (first == null || second == null)
{
return false;
}
var fiter = first.GetEnumerator();
var siter = second.GetEnumerator();
var fnext = fiter.MoveNext();
var snext = siter.MoveNext();
while (fnext && snext)
{
var fenum = fiter.Current as IEnumerable;
var senum = siter.Current as IEnumerable;
if (fenum != null && senum != null)
{
if (!Equals(fenum, senum))
{
return false;
}
}
else if (fenum == null ^ senum == null)
{
return false;
}
else if (!Equals(fiter.Current, siter.Current))
{
return false;
}
fnext = fiter.MoveNext();
snext = siter.MoveNext();
}
return fnext == snext;
}
/// <summary>
/// This returns a hashcode based on the value of the enumerable.
/// </summary>
public static int GetHashCode(IEnumerable enumerable)
{
if (enumerable == null)
{
return 0;
}
var hashcode = 0;
foreach (var obj in enumerable)
{
var enum2 = obj as IEnumerable;
var objHash = enum2 == null ? obj.GetHashCode() : GetHashCode(enum2);
unchecked
{
hashcode = (hashcode*397) ^ (objHash);
}
}
return hashcode;
}
}
}
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