package dynamilize;

import java.lang.invoke.MethodHandle;

import java.lang.invoke.MethodHandles;

import java.lang.reflect.Field;

import java.lang.reflect.Modifier;

@SuppressWarnings("unchecked")

public class JavaVariable implements IVariable{

private final Field field;

private final MethodHandle setter;

private final MethodHandle getter;

public JavaVariable(Field field){

this.field = field;

MethodHandles.Lookup lookup = MethodHandles.lookup();

try{

getter = lookup.unreflectGetter(field);

setter = isConst()? null: lookup.unreflectSetter(field);

}catch(IllegalAccessException e){

throw new IllegalHandleException(e);

}

}

@Override

public String name(){

return field.getName();

}

@Override

public boolean isConst(){

return Modifier.isFinal(field.getModifiers());

}

@Override

public <T> T get(DynamicObject<?> obj){

try{

return (T) getter.invoke(obj);

}catch(ClassCastException e){

throw e;

}catch(Throwable e){

throw new IllegalHandleException(e);

}

}

@Override

public void set(DynamicObject<?> obj, Object value){

if(isConst())

throw new IllegalHandleException("can not modifier a const variable");

try{

setter.invoke(obj, value);

}catch(Throwable e){

throw new IllegalHandleException(e);

}

}

}