[8295] | 1 | #region Copyright notice and license
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| 2 |
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| 3 | // Protocol Buffers - Google's data interchange format
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| 4 | // Copyright 2008 Google Inc. All rights reserved.
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| 5 | // http://github.com/jskeet/dotnet-protobufs/
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| 6 | // Original C++/Java/Python code:
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| 7 | // http://code.google.com/p/protobuf/
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| 8 | //
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| 9 | // Redistribution and use in source and binary forms, with or without
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| 10 | // modification, are permitted provided that the following conditions are
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| 11 | // met:
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| 12 | //
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| 13 | // * Redistributions of source code must retain the above copyright
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| 14 | // notice, this list of conditions and the following disclaimer.
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| 15 | // * Redistributions in binary form must reproduce the above
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| 16 | // copyright notice, this list of conditions and the following disclaimer
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| 17 | // in the documentation and/or other materials provided with the
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| 18 | // distribution.
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| 19 | // * Neither the name of Google Inc. nor the names of its
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| 20 | // contributors may be used to endorse or promote products derived from
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| 21 | // this software without specific prior written permission.
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| 22 | //
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| 23 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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| 24 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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| 25 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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| 26 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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| 27 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 28 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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| 29 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 30 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 31 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 32 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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| 33 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 34 |
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| 35 | #endregion
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| 36 |
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| 37 | using System;
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| 38 | using System.Collections;
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| 39 | using System.Collections.Generic;
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| 40 | using System.Reflection;
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| 41 | using Google.ProtocolBuffers.Descriptors;
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| 42 |
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| 43 | namespace Google.ProtocolBuffers
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| 44 | {
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| 45 | /// <summary>
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| 46 | /// Base type for all generated extensions.
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| 47 | /// </summary>
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| 48 | /// <remarks>
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| 49 | /// The protocol compiler generates a static singleton instance of this
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| 50 | /// class for each extension. For exmaple, imagine a .proto file with:
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| 51 | /// <code>
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| 52 | /// message Foo {
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| 53 | /// extensions 1000 to max
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| 54 | /// }
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| 55 | ///
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| 56 | /// extend Foo {
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| 57 | /// optional int32 bar;
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| 58 | /// }
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| 59 | /// </code>
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| 60 | /// Then MyProto.Foo.Bar has type GeneratedExtensionBase<MyProto.Foo,int>.
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| 61 | /// <para />
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| 62 | /// In general, users should ignore the details of this type, and
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| 63 | /// simply use the static singletons as parameters to the extension accessors
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| 64 | /// in ExtendableMessage and ExtendableBuilder.
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| 65 | /// The interface implemented by both GeneratedException and GeneratedRepeatException,
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| 66 | /// to make it easier to cope with repeats separately.
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| 67 | /// </remarks>
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| 68 | public abstract class GeneratedExtensionBase<TExtension>
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| 69 | {
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| 70 | private readonly FieldDescriptor descriptor;
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| 71 | private readonly IMessageLite messageDefaultInstance;
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| 72 |
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| 73 | protected GeneratedExtensionBase(FieldDescriptor descriptor, Type singularExtensionType)
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| 74 | {
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| 75 | if (!descriptor.IsExtension)
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| 76 | {
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| 77 | throw new ArgumentException("GeneratedExtension given a regular (non-extension) field.");
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| 78 | }
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| 79 |
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| 80 | this.descriptor = descriptor;
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| 81 | if (descriptor.MappedType == MappedType.Message)
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| 82 | {
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| 83 | PropertyInfo defaultInstanceProperty = singularExtensionType
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| 84 | .GetProperty("DefaultInstance", BindingFlags.Static | BindingFlags.Public);
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| 85 | if (defaultInstanceProperty == null)
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| 86 | {
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| 87 | throw new ArgumentException("No public static DefaultInstance property for type " +
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| 88 | typeof (TExtension).Name);
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| 89 | }
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| 90 |
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| 91 | messageDefaultInstance = (IMessageLite) defaultInstanceProperty.GetValue(null, null);
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| 92 | }
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| 93 | }
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| 94 |
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| 95 | public FieldDescriptor Descriptor
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| 96 | {
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| 97 | get { return descriptor; }
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| 98 | }
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| 99 |
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| 100 | public int Number
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| 101 | {
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| 102 | get { return Descriptor.FieldNumber; }
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| 103 | }
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| 104 |
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| 105 | /// <summary>
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| 106 | /// Returns the default message instance for extensions which are message types.
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| 107 | /// </summary>
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| 108 | public IMessageLite MessageDefaultInstance
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| 109 | {
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| 110 | get { return messageDefaultInstance; }
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| 111 | }
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| 112 |
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| 113 | public object SingularFromReflectionType(object value)
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| 114 | {
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| 115 | switch (Descriptor.MappedType)
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| 116 | {
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| 117 | case MappedType.Message:
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| 118 | if (value is TExtension)
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| 119 | {
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| 120 | return value;
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| 121 | }
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| 122 | else
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| 123 | {
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| 124 | // It seems the copy of the embedded message stored inside the
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| 125 | // extended message is not of the exact type the user was
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| 126 | // expecting. This can happen if a user defines a
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| 127 | // GeneratedExtension manually and gives it a different type.
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| 128 | // This should not happen in normal use. But, to be nice, we'll
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| 129 | // copy the message to whatever type the caller was expecting.
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| 130 | return MessageDefaultInstance.WeakCreateBuilderForType()
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| 131 | .WeakMergeFrom((IMessageLite) value).WeakBuild();
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| 132 | }
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| 133 | case MappedType.Enum:
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| 134 | // Just return a boxed int - that can be unboxed to the enum
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| 135 | EnumValueDescriptor enumValue = (EnumValueDescriptor) value;
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| 136 | return enumValue.Number;
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| 137 | default:
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| 138 | return value;
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| 139 | }
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| 140 | }
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| 141 |
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| 142 | /// <summary>
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| 143 | /// Converts from the type used by the native accessors to the type
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| 144 | /// used by reflection accessors. For example, the reflection accessors
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| 145 | /// for enums use EnumValueDescriptors but the native accessors use
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| 146 | /// the generated enum type.
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| 147 | /// </summary>
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| 148 | public object ToReflectionType(object value)
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| 149 | {
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| 150 | if (descriptor.IsRepeated)
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| 151 | {
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| 152 | if (descriptor.MappedType == MappedType.Enum)
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| 153 | {
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| 154 | // Must convert the whole list.
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| 155 | IList<object> result = new List<object>();
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| 156 | foreach (object element in (IEnumerable) value)
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| 157 | {
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| 158 | result.Add(SingularToReflectionType(element));
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| 159 | }
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| 160 | return result;
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| 161 | }
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| 162 | else
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| 163 | {
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| 164 | return value;
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| 165 | }
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| 166 | }
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| 167 | else
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| 168 | {
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| 169 | return SingularToReflectionType(value);
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| 170 | }
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| 171 | }
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| 172 |
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| 173 | /// <summary>
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| 174 | /// Like ToReflectionType(object) but for a single element.
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| 175 | /// </summary>
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| 176 | internal Object SingularToReflectionType(object value)
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| 177 | {
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| 178 | return descriptor.MappedType == MappedType.Enum
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| 179 | ? descriptor.EnumType.FindValueByNumber((int) value)
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| 180 | : value;
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| 181 | }
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| 182 |
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| 183 | public abstract object FromReflectionType(object value);
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| 184 | }
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| 185 | } |
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