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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.Reflection;
using Google.ProtocolBuffers.Descriptors;
namespace Google.ProtocolBuffers.FieldAccess
{
/// <summary>
/// Access for a non-repeated field of a "primitive" type (i.e. not another message or an enum).
/// </summary>
internal class SinglePrimitiveAccessor<TMessage, TBuilder> : IFieldAccessor<TMessage, TBuilder>
where TMessage : IMessage<TMessage, TBuilder>
where TBuilder : IBuilder<TMessage, TBuilder>
{
private readonly Type clrType;
private readonly FieldDescriptor field;
private readonly Func<TMessage, object> getValueDelegate;
private readonly Action<TBuilder, object> setValueDelegate;
private readonly Func<TMessage, bool> hasDelegate;
private readonly Func<TBuilder, IBuilder> clearDelegate;
/// <summary>
/// The CLR type of the field (int, the enum type, ByteString, the message etc).
/// As declared by the property.
/// </summary>
protected Type ClrType
{
get { return clrType; }
}
internal SinglePrimitiveAccessor(FieldDescriptor fieldDesriptor, string name, bool supportFieldPresence)
{
field = fieldDesriptor;
PropertyInfo messageProperty = typeof(TMessage).GetProperty(name, null, ReflectionUtil.EmptyTypes);
PropertyInfo builderProperty = typeof(TBuilder).GetProperty(name, null, ReflectionUtil.EmptyTypes);
MethodInfo clearMethod = typeof(TBuilder).GetMethod("Clear" + name);
if (messageProperty == null || builderProperty == null || clearMethod == null)
{
throw new ArgumentException("Not all required properties/methods available");
}
if (supportFieldPresence)
{
PropertyInfo hasProperty = typeof(TMessage).GetProperty("Has" + name);
if (hasProperty == null)
{
throw new ArgumentException("Has properties not available");
}
hasDelegate = ReflectionUtil.CreateDelegateFunc<TMessage, bool>(hasProperty.GetGetMethod());
}
clrType = messageProperty.PropertyType;
clearDelegate = ReflectionUtil.CreateDelegateFunc<TBuilder, IBuilder>(clearMethod);
getValueDelegate = ReflectionUtil.CreateUpcastDelegate<TMessage>(messageProperty.GetGetMethod());
setValueDelegate = ReflectionUtil.CreateDowncastDelegate<TBuilder>(builderProperty.GetSetMethod());
}
public bool Has(TMessage message)
{
if (hasDelegate == null)
{
return !GetValue(message).Equals(field.DefaultValue);
}
return hasDelegate(message);
}
public void Clear(TBuilder builder)
{
clearDelegate(builder);
}
/// <summary>
/// Only valid for message types - this implementation throws InvalidOperationException.
/// </summary>
public virtual IBuilder CreateBuilder()
{
throw new InvalidOperationException();
}
public virtual object GetValue(TMessage message)
{
return getValueDelegate(message);
}
public virtual void SetValue(TBuilder builder, object value)
{
setValueDelegate(builder, value);
}
#region Methods only related to repeated values
public int GetRepeatedCount(TMessage message)
{
throw new InvalidOperationException();
}
public object GetRepeatedValue(TMessage message, int index)
{
throw new InvalidOperationException();
}
public void SetRepeated(TBuilder builder, int index, object value)
{
throw new InvalidOperationException();
}
public void AddRepeated(TBuilder builder, object value)
{
throw new InvalidOperationException();
}
public object GetRepeatedWrapper(TBuilder builder)
{
throw new InvalidOperationException();
}
#endregion
}
}
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