import com.sun.jna.ToNativeContext; //导入依赖的package包/类
public Object toNative(Object arg, ToNativeContext context) {
    if (arg == null) {
        return null;
    }
    Pointer ptr = ((NativeObject) arg).handle();
    
    //
    // Deal with any adjustments to the proxy neccessitated by gstreamer
    // breaking their reference-counting idiom with special cases
    //
    if (context instanceof MethodParameterContext) {
        MethodParameterContext mcontext = (MethodParameterContext) context;
        Method method = mcontext.getMethod();
        int index = mcontext.getParameterIndex();
        Annotation[][] parameterAnnotations = method.getParameterAnnotations();
        if (index < parameterAnnotations.length) {
            Annotation[] annotations = parameterAnnotations[index];
            for (int i = 0; i < annotations.length; ++i) {
                if (annotations[i] instanceof Invalidate) {
                    ((Handle) arg).invalidate();
                    break;
                } else if (annotations[i] instanceof IncRef) {
                    ((RefCountedObject) arg).ref();
                    break;
                }
            }
        }
    }
    return ptr;
}
 

import com.sun.jna.ToNativeContext; //导入依赖的package包/类
public Object toNative(Object arg, ToNativeContext context) {
    if (arg == null) {
        return null;
    }
    Pointer ptr = ((NativeObject) arg).getNativeAddress();
    return ptr;
}
 

import com.sun.jna.ToNativeContext; //导入依赖的package包/类
@Override public Object toNative(Object value, ToNativeContext context) {
    return Boolean.TRUE.equals(value) ? 1 : 0;
}
 

import com.sun.jna.ToNativeContext; //导入依赖的package包/类
@Override
public Long toNative(Object input, ToNativeContext context) {
	return ((JnaLongEnum<?>) input).getValue();
}
 

import com.sun.jna.ToNativeContext; //导入依赖的package包/类
@Override
public Integer toNative(Object input, ToNativeContext context) {
	return ((KernReturnT) input).getValue();
}
 

import com.sun.jna.ToNativeContext; //导入依赖的package包/类
@Override
public Integer toNative(Object input, ToNativeContext context) {
	return ((JnaIntEnum<?>) input).getValue();
}
 

import com.sun.jna.ToNativeContext; //导入依赖的package包/类
public Object toNative(Object obj, ToNativeContext ctx) {
	final NativeEnum ne = (NativeEnum)obj;
	return ne.getNativeValue();
}