// Protocol Buffers - Google's data interchange format | |
// Copyright 2008 Google Inc. All rights reserved. | |
// http://github.com/jskeet/dotnet-protobufs/ | |
// Original C++/Java/Python code: | |
// http://code.google.com/p/protobuf/ | |
// | |
// Redistribution and use in source and binary forms, with or without | |
// modification, are permitted provided that the following conditions are | |
// met: | |
// | |
// * Redistributions of source code must retain the above copyright | |
// notice, this list of conditions and the following disclaimer. | |
// * Redistributions in binary form must reproduce the above | |
// copyright notice, this list of conditions and the following disclaimer | |
// in the documentation and/or other materials provided with the | |
// distribution. | |
// * Neither the name of Google Inc. nor the names of its | |
// contributors may be used to endorse or promote products derived from | |
// this software without specific prior written permission. | |
// | |
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
using System; | |
using System.Collections; | |
using System.Reflection; | |
namespace Google.ProtocolBuffers.FieldAccess | |
{ | |
/// <summary> | |
/// Accessor for a repeated field of type int, ByteString etc. | |
/// </summary> | |
internal class RepeatedPrimitiveAccessor<TMessage, TBuilder> : IFieldAccessor<TMessage, TBuilder> | |
where TMessage : IMessage<TMessage, TBuilder> | |
where TBuilder : IBuilder<TMessage, TBuilder> | |
{ | |
private readonly Type clrType; | |
private readonly Func<TMessage, object> getValueDelegate; | |
private readonly Func<TBuilder, IBuilder> clearDelegate; | |
private readonly Action<TBuilder, object> addValueDelegate; | |
private readonly Func<TBuilder, object> getRepeatedWrapperDelegate; | |
private readonly Func<TMessage, int> countDelegate; | |
private readonly MethodInfo getElementMethod; | |
private readonly MethodInfo setElementMethod; | |
// Replacement for Type.EmptyTypes which apparently isn't available on the compact framework | |
internal static readonly Type[] EmptyTypes = new Type[0]; | |
/// <summary> | |
/// The CLR type of the field (int, the enum type, ByteString, the message etc). | |
/// This is taken from the return type of the method used to retrieve a single | |
/// value. | |
/// </summary> | |
protected Type ClrType | |
{ | |
get { return clrType; } | |
} | |
internal RepeatedPrimitiveAccessor(string name) | |
{ | |
PropertyInfo messageProperty = typeof(TMessage).GetProperty(name + "List"); | |
PropertyInfo builderProperty = typeof(TBuilder).GetProperty(name + "List"); | |
PropertyInfo countProperty = typeof(TMessage).GetProperty(name + "Count"); | |
MethodInfo clearMethod = typeof(TBuilder).GetMethod("Clear" + name, EmptyTypes); | |
getElementMethod = typeof(TMessage).GetMethod("Get" + name, new Type[] {typeof(int)}); | |
clrType = getElementMethod.ReturnType; | |
MethodInfo addMethod = typeof(TBuilder).GetMethod("Add" + name, new Type[] {ClrType}); | |
setElementMethod = typeof(TBuilder).GetMethod("Set" + name, new Type[] {typeof(int), ClrType}); | |
if (messageProperty == null | |
|| builderProperty == null | |
|| countProperty == null | |
|| clearMethod == null | |
|| addMethod == null | |
|| getElementMethod == null | |
|| setElementMethod == null) | |
{ | |
throw new ArgumentException("Not all required properties/methods available"); | |
} | |
clearDelegate = ReflectionUtil.CreateDelegateFunc<TBuilder, IBuilder>(clearMethod); | |
countDelegate = ReflectionUtil.CreateDelegateFunc<TMessage, int>(countProperty.GetGetMethod()); | |
getValueDelegate = ReflectionUtil.CreateUpcastDelegate<TMessage>(messageProperty.GetGetMethod()); | |
addValueDelegate = ReflectionUtil.CreateDowncastDelegateIgnoringReturn<TBuilder>(addMethod); | |
getRepeatedWrapperDelegate = ReflectionUtil.CreateUpcastDelegate<TBuilder>(builderProperty.GetGetMethod()); | |
} | |
public bool Has(TMessage message) | |
{ | |
throw new InvalidOperationException(); | |
} | |
public virtual IBuilder CreateBuilder() | |
{ | |
throw new InvalidOperationException(); | |
} | |
public virtual object GetValue(TMessage message) | |
{ | |
return getValueDelegate(message); | |
} | |
public void SetValue(TBuilder builder, object value) | |
{ | |
// Add all the elements individually. This serves two purposes: | |
// 1) Verifies that each element has the correct type. | |
// 2) Insures that the caller cannot modify the list later on and | |
// have the modifications be reflected in the message. | |
Clear(builder); | |
foreach (object element in (IEnumerable) value) | |
{ | |
AddRepeated(builder, element); | |
} | |
} | |
public void Clear(TBuilder builder) | |
{ | |
clearDelegate(builder); | |
} | |
public int GetRepeatedCount(TMessage message) | |
{ | |
return countDelegate(message); | |
} | |
public virtual object GetRepeatedValue(TMessage message, int index) | |
{ | |
return getElementMethod.Invoke(message, new object[] {index}); | |
} | |
public virtual void SetRepeated(TBuilder builder, int index, object value) | |
{ | |
ThrowHelper.ThrowIfNull(value, "value"); | |
setElementMethod.Invoke(builder, new object[] {index, value}); | |
} | |
public virtual void AddRepeated(TBuilder builder, object value) | |
{ | |
ThrowHelper.ThrowIfNull(value, "value"); | |
addValueDelegate(builder, value); | |
} | |
/// <summary> | |
/// The builder class's accessor already builds a read-only wrapper for | |
/// us, which is exactly what we want. | |
/// </summary> | |
public object GetRepeatedWrapper(TBuilder builder) | |
{ | |
return getRepeatedWrapperDelegate(builder); | |
} | |
} | |
} |