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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 : IFieldAccessor {
private readonly PropertyInfo messageProperty;
private readonly PropertyInfo builderProperty;
private readonly PropertyInfo hasProperty;
private readonly MethodInfo clearMethod;
/// <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 messageProperty.PropertyType; }
}
internal SinglePrimitiveAccessor(string name, Type messageType, Type builderType) {
messageProperty = messageType.GetProperty(name);
builderProperty = builderType.GetProperty(name);
hasProperty = messageType.GetProperty("Has" + name);
clearMethod = builderType.GetMethod("Clear" + name);
if (messageProperty == null || builderProperty == null || hasProperty == null || clearMethod == null) {
throw new ArgumentException("Not all required properties/methods available");
}
}
public bool Has(IMessage message) {
return (bool) hasProperty.GetValue(message, null);
}
public void Clear(IBuilder builder) {
clearMethod.Invoke(builder, null);
}
/// <summary>
/// Only valid for message types - this implementation throws InvalidOperationException.
/// </summary>
public virtual IBuilder CreateBuilder() {
throw new InvalidOperationException();
}
public virtual object GetValue(IMessage message) {
return messageProperty.GetValue(message, null);
}
public virtual void SetValue(IBuilder builder, object value) {
builderProperty.SetValue(builder, value, null);
}
#region Methods only related to repeated values
public int GetRepeatedCount(IMessage 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
}
}
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