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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.
// http://code.google.com/p/protobuf/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
using System;
using System.Reflection;
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 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(string name) {
string propertyName = name == typeof(TMessage).Name ? name + "_" : name;
PropertyInfo messageProperty = typeof(TMessage).GetProperty(propertyName);
PropertyInfo builderProperty = typeof(TBuilder).GetProperty(name); // FIXME!
if (builderProperty == null) builderProperty = typeof(TBuilder).GetProperty(propertyName); // FIXME!
PropertyInfo hasProperty = typeof(TMessage).GetProperty("Has" + name);
MethodInfo clearMethod = typeof(TBuilder).GetMethod("Clear" + name, Type.EmptyTypes);
if (messageProperty == null || builderProperty == null || hasProperty == null || clearMethod == null) {
throw new ArgumentException("Not all required properties/methods available");
}
clrType = messageProperty.PropertyType;
hasDelegate = (Func<TMessage, bool>)Delegate.CreateDelegate(typeof(Func<TMessage, bool>), hasProperty.GetGetMethod());
clearDelegate = (Func<TBuilder, IBuilder>)Delegate.CreateDelegate(typeof(Func<TBuilder, IBuilder>), clearMethod);
getValueDelegate = ReflectionUtil.CreateUpcastDelegate<TMessage>(messageProperty.GetGetMethod());
setValueDelegate = ReflectionUtil.CreateDowncastDelegate<TBuilder>(builderProperty.GetSetMethod());
}
public bool Has(TMessage message) {
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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