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1 | // Licensed to the Apache Software Foundation(ASF) under one |
2 | // or more contributor license agreements.See the NOTICE file | |
3 | // distributed with this work for additional information | |
4 | // regarding copyright ownership.The ASF licenses this file | |
5 | // to you under the Apache License, Version 2.0 (the | |
6 | // "License"); you may not use this file except in compliance | |
7 | // with the License. You may obtain a copy of the License at | |
8 | // | |
9 | // http://www.apache.org/licenses/LICENSE-2.0 | |
10 | // | |
11 | // Unless required by applicable law or agreed to in writing, | |
12 | // software distributed under the License is distributed on an | |
13 | // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
14 | // KIND, either express or implied. See the License for the | |
15 | // specific language governing permissions and limitations | |
16 | // under the License. | |
17 | ||
18 | using System.Collections; | |
19 | ||
20 | namespace Thrift.Collections | |
21 | { | |
22 | // ReSharper disable once InconsistentNaming | |
23 | public class TCollections | |
24 | { | |
25 | /// <summary> | |
26 | /// This will return true if the two collections are value-wise the same. | |
27 | /// If the collection contains a collection, the collections will be compared using this method. | |
28 | /// </summary> | |
29 | public static bool Equals(IEnumerable first, IEnumerable second) | |
30 | { | |
31 | if (first == null && second == null) | |
32 | { | |
33 | return true; | |
34 | } | |
35 | ||
36 | if (first == null || second == null) | |
37 | { | |
38 | return false; | |
39 | } | |
40 | ||
41 | var fiter = first.GetEnumerator(); | |
42 | var siter = second.GetEnumerator(); | |
43 | ||
44 | var fnext = fiter.MoveNext(); | |
45 | var snext = siter.MoveNext(); | |
46 | ||
47 | while (fnext && snext) | |
48 | { | |
49 | var fenum = fiter.Current as IEnumerable; | |
50 | var senum = siter.Current as IEnumerable; | |
51 | ||
52 | if (fenum != null && senum != null) | |
53 | { | |
54 | if (!Equals(fenum, senum)) | |
55 | { | |
56 | return false; | |
57 | } | |
58 | } | |
59 | else if (fenum == null ^ senum == null) | |
60 | { | |
61 | return false; | |
62 | } | |
63 | else if (!Equals(fiter.Current, siter.Current)) | |
64 | { | |
65 | return false; | |
66 | } | |
67 | ||
68 | fnext = fiter.MoveNext(); | |
69 | snext = siter.MoveNext(); | |
70 | } | |
71 | ||
72 | return fnext == snext; | |
73 | } | |
74 | ||
75 | /// <summary> | |
76 | /// This returns a hashcode based on the value of the enumerable. | |
77 | /// </summary> | |
78 | public static int GetHashCode(IEnumerable enumerable) | |
79 | { | |
80 | if (enumerable == null) | |
81 | { | |
82 | return 0; | |
83 | } | |
84 | ||
85 | var hashcode = 0; | |
86 | ||
87 | foreach (var obj in enumerable) | |
88 | { | |
89 | var enum2 = obj as IEnumerable; | |
90 | var objHash = enum2 == null ? obj.GetHashCode() : GetHashCode(enum2); | |
91 | ||
92 | unchecked | |
93 | { | |
94 | hashcode = (hashcode*397) ^ (objHash); | |
95 | } | |
96 | } | |
97 | ||
98 | return hashcode; | |
99 | } | |
100 | } | |
101 | } |