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using System;
namespace Unity.MLAgents.Sensors.Reflection
{
internal class EnumReflectionSensor : ReflectionSensorBase
{
Array m_Values;
bool m_IsFlags;
internal EnumReflectionSensor(ReflectionSensorInfo reflectionSensorInfo)
: base(reflectionSensorInfo, GetEnumObservationSize(reflectionSensorInfo.GetMemberType()))
{
var memberType = reflectionSensorInfo.GetMemberType();
m_Values = Enum.GetValues(memberType);
m_IsFlags = memberType.IsDefined(typeof(FlagsAttribute), false);
}
internal override void WriteReflectedField(ObservationWriter writer)
{
// Write the enum value as a one-hot encoding.
// Note that unknown enum values will record all 0's.
// Flags will get treated as a sequence of bools.
var enumValue = (Enum)GetReflectedValue();
int i = 0;
foreach (var val in m_Values)
{
if (m_IsFlags)
{
if (enumValue.HasFlag((Enum)val))
{
writer[i] = 1.0f;
}
else
{
writer[i] = 0.0f;
}
}
else
{
if (val.Equals(enumValue))
{
writer[i] = 1.0f;
}
else
{
writer[i] = 0.0f;
}
}
i++;
}
}
internal static int GetEnumObservationSize(Type t)
{
var values = Enum.GetValues(t);
// Account for all enum values
return values.Length;
}
}
}
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