120 lines
4.7 KiB
C#
120 lines
4.7 KiB
C#
#region Copyright notice and license
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// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#endregion
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using System;
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namespace LC.Google.Protobuf
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{
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/// <summary>
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/// Represents a non-generic extension definition. This API is experimental and subject to change.
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/// </summary>
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public abstract class Extension
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{
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internal abstract Type TargetType { get; }
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/// <summary>
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/// Internal use. Creates a new extension with the specified field number.
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/// </summary>
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protected Extension(int fieldNumber)
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{
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FieldNumber = fieldNumber;
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}
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internal abstract IExtensionValue CreateValue();
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/// <summary>
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/// Gets the field number of this extension
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/// </summary>
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public int FieldNumber { get; }
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internal abstract bool IsRepeated { get; }
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}
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/// <summary>
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/// Represents a type-safe extension identifier used for getting and setting single extension values in <see cref="IExtendableMessage{T}"/> instances.
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/// This API is experimental and subject to change.
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/// </summary>
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/// <typeparam name="TTarget">The message type this field applies to</typeparam>
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/// <typeparam name="TValue">The field value type of this extension</typeparam>
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public sealed class Extension<TTarget, TValue> : Extension where TTarget : IExtendableMessage<TTarget>
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{
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private readonly FieldCodec<TValue> codec;
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/// <summary>
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/// Creates a new extension identifier with the specified field number and codec
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/// </summary>
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public Extension(int fieldNumber, FieldCodec<TValue> codec) : base(fieldNumber)
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{
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this.codec = codec;
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}
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internal TValue DefaultValue => codec.DefaultValue;
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internal override Type TargetType => typeof(TTarget);
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internal override bool IsRepeated => false;
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internal override IExtensionValue CreateValue()
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{
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return new ExtensionValue<TValue>(codec);
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}
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}
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/// <summary>
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/// Represents a type-safe extension identifier used for getting repeated extension values in <see cref="IExtendableMessage{T}"/> instances.
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/// This API is experimental and subject to change.
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/// </summary>
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/// <typeparam name="TTarget">The message type this field applies to</typeparam>
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/// <typeparam name="TValue">The repeated field value type of this extension</typeparam>
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public sealed class RepeatedExtension<TTarget, TValue> : Extension where TTarget : IExtendableMessage<TTarget>
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{
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private readonly FieldCodec<TValue> codec;
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/// <summary>
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/// Creates a new repeated extension identifier with the specified field number and codec
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/// </summary>
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public RepeatedExtension(int fieldNumber, FieldCodec<TValue> codec) : base(fieldNumber)
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{
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this.codec = codec;
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}
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internal override Type TargetType => typeof(TTarget);
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internal override bool IsRepeated => true;
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internal override IExtensionValue CreateValue()
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{
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return new RepeatedExtensionValue<TValue>(codec);
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}
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}
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}
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