1#region Copyright notice and license
2// Protocol Buffers - Google's data interchange format
3// Copyright 2015 Google Inc.  All rights reserved.
4// https://developers.google.com/protocol-buffers/
5//
6// Redistribution and use in source and binary forms, with or without
7// modification, are permitted provided that the following conditions are
8// met:
9//
10//     * Redistributions of source code must retain the above copyright
11// notice, this list of conditions and the following disclaimer.
12//     * Redistributions in binary form must reproduce the above
13// copyright notice, this list of conditions and the following disclaimer
14// in the documentation and/or other materials provided with the
15// distribution.
16//     * Neither the name of Google Inc. nor the names of its
17// contributors may be used to endorse or promote products derived from
18// this software without specific prior written permission.
19//
20// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31#endregion
32
33using System;
34using System.Reflection;
35using Google.Protobuf.Compatibility;
36
37namespace Google.Protobuf.Reflection
38{
39    /// <summary>
40    /// Base class for field accessors.
41    /// </summary>
42    internal abstract class FieldAccessorBase : IFieldAccessor
43    {
44        private readonly Func<IMessage, object> getValueDelegate;
45        private readonly FieldDescriptor descriptor;
46
47        internal FieldAccessorBase(PropertyInfo property, FieldDescriptor descriptor)
48        {
49            this.descriptor = descriptor;
50            getValueDelegate = ReflectionUtil.CreateFuncIMessageObject(property.GetGetMethod());
51        }
52
53        public FieldDescriptor Descriptor { get { return descriptor; } }
54
55        public object GetValue(IMessage message)
56        {
57            return getValueDelegate(message);
58        }
59
60        public abstract bool HasValue(IMessage message);
61        public abstract void Clear(IMessage message);
62        public abstract void SetValue(IMessage message, object value);
63    }
64}
65