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// 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);
}
}
}
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