{--
JVM-Bridge -- bridge from FP languages and others to the Java VM
Copyright (C) 2001 Ashley Yakeley <ashley@semantic.org>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
--}

module Foreign.JavaVM.Typed.Field
(
	getStaticField,getField
) where
{
	import Foreign.JavaVM.Typed.Class;
	import Foreign.JavaVM.Typed.Object;
	import Foreign.JavaVM.Typed.Reference;
	import Foreign.JavaVM.Typed.Value;
	import Foreign.JavaVM.VM;
	import Platform.JavaVM;
	import Control.Monad.Reference;
	import Data.Witness;

	getStaticFieldByType :: (IsJVMValue v) =>
		Type v -> JClass -> MemberName -> VM (Ref IO v);
	getStaticFieldByType vType (MkTLRef jClass) name = tlConvertVMType (\(from,to) -> do
	{
		field <- vmGetStaticField jClass (MkMemberNameType name (getValueType vType));
		return (MkRef
		{
			getRef = do
			{
				vmval <- getRef field;
				from vmval;
			},
			setRef = \v -> do
			{
				vmval <- to v;
				setRef field vmval;
			}
		});
	});

	getFieldByType :: (IsJavaClassMarker c,IsJVMValue v) =>
		Type v -> JClass -> MemberName -> VM (ObjectRef c -> Ref IO v);
	getFieldByType vType (MkTLRef jClass) name = tlConvertVMType (\(from,to) -> do
	{
		field <- vmGetField jClass (MkMemberNameType name (getValueType vType));
		return (\(MkTLRef vmobj) -> MkRef
		{
			getRef = do
			{
				vmval <- getRef (field vmobj);
				from vmval;
			},
			setRef = \v -> do
			{
				vmval <- to v;
				setRef (field vmobj) vmval;
			}
		});
	});

	getStaticField :: (IsJVMValue v) =>
		JClass -> MemberName -> VM (Ref IO v);
	getStaticField = getStaticFieldByType Type;

	getField :: (IsJavaClassMarker c,IsJVMValue v) =>
		JClass -> MemberName -> VM (ObjectRef c -> Ref IO v);
	getField = getFieldByType Type;
}