// 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 {
///
/// Access for a non-repeated field of a "primitive" type (i.e. not another message or an enum).
///
internal class SinglePrimitiveAccessor : IFieldAccessor
where TMessage : IMessage
where TBuilder : IBuilder {
private readonly PropertyInfo messageProperty;
private readonly PropertyInfo builderProperty;
private readonly HasDelegate hasDelegate;
private readonly ClearDelegate clearDelegate;
///
/// The CLR type of the field (int, the enum type, ByteString, the message etc).
/// As declared by the property.
///
protected Type ClrType {
get { return messageProperty.PropertyType; }
}
internal SinglePrimitiveAccessor(string name) {
messageProperty = typeof(TMessage).GetProperty(name);
builderProperty = typeof(TBuilder).GetProperty(name);
PropertyInfo hasProperty = typeof(TMessage).GetProperty("Has" + name);
MethodInfo clearMethod = typeof(TBuilder).GetMethod("Clear" + name);
if (messageProperty == null || builderProperty == null || hasProperty == null || clearMethod == null) {
throw new ArgumentException("Not all required properties/methods available");
}
hasDelegate = (HasDelegate)Delegate.CreateDelegate(typeof(HasDelegate), hasProperty.GetGetMethod());
clearDelegate = (ClearDelegate)Delegate.CreateDelegate(typeof(ClearDelegate), clearMethod);
}
public bool Has(TMessage message) {
return hasDelegate(message);
}
public void Clear(TBuilder builder) {
clearDelegate(builder);
}
///
/// Only valid for message types - this implementation throws InvalidOperationException.
///
public virtual IBuilder CreateBuilder() {
throw new InvalidOperationException();
}
public virtual object GetValue(TMessage message) {
return messageProperty.GetValue(message, null);
}
public virtual void SetValue(TBuilder builder, object value) {
builderProperty.SetValue(builder, value, null);
}
#region Methods only related to repeated values
public int GetRepeatedCount(TMessage message) {
throw new InvalidOperationException();
}
public object GetRepeatedValue(IMessage message, int index) {
throw new InvalidOperationException();
}
public void SetRepeated(IBuilder builder, int index, object value) {
throw new InvalidOperationException();
}
public void AddRepeated(IBuilder builder, object value) {
throw new InvalidOperationException();
}
public object GetRepeatedWrapper(IBuilder builder) {
throw new InvalidOperationException();
}
#endregion
}
}