305 lines
15 KiB
C#
305 lines
15 KiB
C#
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#region Copyright notice and license
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// Protocol Buffers - Google's data interchange format
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// Copyright 2017 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 LC.Google.Protobuf.Collections;
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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namespace LC.Google.Protobuf.Reflection
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{
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/// <summary>
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/// Container for a set of custom options specified within a message, field etc.
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/// </summary>
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/// <remarks>
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/// <para>
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/// This type is publicly immutable, but internally mutable. It is only populated
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/// by the descriptor parsing code - by the time any user code is able to see an instance,
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/// it will be fully initialized.
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/// </para>
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/// <para>
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/// If an option is requested using the incorrect method, an answer may still be returned: all
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/// of the numeric types are represented internally using 64-bit integers, for example. It is up to
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/// the caller to ensure that they make the appropriate method call for the option they're interested in.
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/// Note that enum options are simply stored as integers, so the value should be fetched using
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/// <see cref="TryGetInt32(int, out int)"/> and then cast appropriately.
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/// </para>
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/// <para>
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/// Repeated options are currently not supported. Asking for a single value of an option
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/// which was actually repeated will return the last value, except for message types where
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/// all the set values are merged together.
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/// </para>
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/// </remarks>
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public sealed class CustomOptions
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{
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private static readonly object[] EmptyParameters = new object[0];
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private readonly IDictionary<int, IExtensionValue> values;
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internal CustomOptions(IDictionary<int, IExtensionValue> values)
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{
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this.values = values;
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}
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/// <summary>
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/// Retrieves a Boolean value for the specified option field.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetBool(int field, out bool value) => TryGetPrimitiveValue(field, out value);
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/// <summary>
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/// Retrieves a signed 32-bit integer value for the specified option field.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetInt32(int field, out int value) => TryGetPrimitiveValue(field, out value);
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/// <summary>
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/// Retrieves a signed 64-bit integer value for the specified option field.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetInt64(int field, out long value) => TryGetPrimitiveValue(field, out value);
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/// <summary>
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/// Retrieves an unsigned 32-bit integer value for the specified option field,
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/// assuming a fixed-length representation.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetFixed32(int field, out uint value) => TryGetUInt32(field, out value);
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/// <summary>
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/// Retrieves an unsigned 64-bit integer value for the specified option field,
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/// assuming a fixed-length representation.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetFixed64(int field, out ulong value) => TryGetUInt64(field, out value);
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/// <summary>
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/// Retrieves a signed 32-bit integer value for the specified option field,
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/// assuming a fixed-length representation.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetSFixed32(int field, out int value) => TryGetInt32(field, out value);
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/// <summary>
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/// Retrieves a signed 64-bit integer value for the specified option field,
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/// assuming a fixed-length representation.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetSFixed64(int field, out long value) => TryGetInt64(field, out value);
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/// <summary>
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/// Retrieves a signed 32-bit integer value for the specified option field,
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/// assuming a zigzag encoding.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetSInt32(int field, out int value) => TryGetPrimitiveValue(field, out value);
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/// <summary>
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/// Retrieves a signed 64-bit integer value for the specified option field,
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/// assuming a zigzag encoding.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetSInt64(int field, out long value) => TryGetPrimitiveValue(field, out value);
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/// <summary>
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/// Retrieves an unsigned 32-bit integer value for the specified option field.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetUInt32(int field, out uint value) => TryGetPrimitiveValue(field, out value);
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/// <summary>
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/// Retrieves an unsigned 64-bit integer value for the specified option field.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetUInt64(int field, out ulong value) => TryGetPrimitiveValue(field, out value);
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/// <summary>
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/// Retrieves a 32-bit floating point value for the specified option field.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetFloat(int field, out float value) => TryGetPrimitiveValue(field, out value);
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/// <summary>
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/// Retrieves a 64-bit floating point value for the specified option field.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetDouble(int field, out double value) => TryGetPrimitiveValue(field, out value);
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/// <summary>
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/// Retrieves a string value for the specified option field.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetString(int field, out string value) => TryGetPrimitiveValue(field, out value);
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/// <summary>
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/// Retrieves a bytes value for the specified option field.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetBytes(int field, out ByteString value) => TryGetPrimitiveValue(field, out value);
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/// <summary>
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/// Retrieves a message value for the specified option field.
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/// </summary>
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/// <param name="field">The field to fetch the value for.</param>
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/// <param name="value">The output variable to populate.</param>
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/// <returns><c>true</c> if a suitable value for the field was found; <c>false</c> otherwise.</returns>
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public bool TryGetMessage<T>(int field, out T value) where T : class, IMessage, new()
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{
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if (values == null)
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{
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value = default(T);
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return false;
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}
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IExtensionValue extensionValue;
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if (values.TryGetValue(field, out extensionValue))
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{
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if (extensionValue is ExtensionValue<T>)
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{
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ExtensionValue<T> single = extensionValue as ExtensionValue<T>;
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ByteString bytes = single.GetValue().ToByteString();
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value = new T();
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value.MergeFrom(bytes);
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return true;
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}
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else if (extensionValue is RepeatedExtensionValue<T>)
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{
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RepeatedExtensionValue<T> repeated = extensionValue as RepeatedExtensionValue<T>;
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value = repeated.GetValue()
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.Select(v => v.ToByteString())
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.Aggregate(new T(), (t, b) =>
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{
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t.MergeFrom(b);
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return t;
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});
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return true;
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}
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}
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value = null;
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return false;
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}
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private bool TryGetPrimitiveValue<T>(int field, out T value)
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{
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if (values == null)
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{
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value = default(T);
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return false;
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}
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IExtensionValue extensionValue;
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if (values.TryGetValue(field, out extensionValue))
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{
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if (extensionValue is ExtensionValue<T>)
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{
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ExtensionValue<T> single = extensionValue as ExtensionValue<T>;
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value = single.GetValue();
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return true;
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}
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else if (extensionValue is RepeatedExtensionValue<T>)
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{
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RepeatedExtensionValue<T> repeated = extensionValue as RepeatedExtensionValue<T>;
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if (repeated.GetValue().Count != 0)
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{
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RepeatedField<T> repeatedField = repeated.GetValue();
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value = repeatedField[repeatedField.Count - 1];
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return true;
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}
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}
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else // and here we find explicit enum handling since T : Enum ! x is ExtensionValue<Enum>
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{
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var type = extensionValue.GetType();
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if (type.GetGenericTypeDefinition() == typeof(ExtensionValue<>))
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{
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var typeInfo = type.GetTypeInfo();
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var typeArgs = typeInfo.GenericTypeArguments;
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if (typeArgs.Length == 1 && typeArgs[0].GetTypeInfo().IsEnum)
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{
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value = (T)typeInfo.GetDeclaredMethod(nameof(ExtensionValue<T>.GetValue)).Invoke(extensionValue, EmptyParameters);
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return true;
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}
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}
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else if (type.GetGenericTypeDefinition() == typeof(RepeatedExtensionValue<>))
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{
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var typeInfo = type.GetTypeInfo();
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var typeArgs = typeInfo.GenericTypeArguments;
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if (typeArgs.Length == 1 && typeArgs[0].GetTypeInfo().IsEnum)
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{
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var values = (IList)typeInfo.GetDeclaredMethod(nameof(RepeatedExtensionValue<T>.GetValue)).Invoke(extensionValue, EmptyParameters);
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if (values.Count != 0)
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{
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value = (T)values[values.Count - 1];
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return true;
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}
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}
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}
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}
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}
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value = default(T);
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return false;
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}
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}
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}
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