blob: b1b6b1228ab203b5203043eee64e90d45dcd8674 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.
// http://code.google.com/p/protobuf/
//
// Licensed 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.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);
}
}
/// <summary>
/// Utility class for dealing with lists.
/// </summary>
public static class Lists<T> {
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);
}
}
}
|
