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package at.spardat.xma.rpc;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.eclipse.swt.widgets.Display;

public class BusyExecutorHelper {

    public static Display getDisplay() {
        Display display = Display.getCurrent(); // from the UI thread
        if (display == null) {
            display = Display.getDefault();
        }
        return display;
    }

    public static boolean hasDisplayMessages() {
        return getDisplayMessageCount() != 0;
    }

    public static int getDisplayMessageCount()  {
        Display display = getDisplay();
        Integer result = null;
        if (display != null) {
            Method m;
            try {
                m = display.getClass().getDeclaredMethod("getMessageCount",null);
                m.setAccessible(true);
                try {
                    result = (Integer) m.invoke(display, null);
                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    e.printStackTrace();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } catch (SecurityException e) {
                e.printStackTrace();
            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            }
            if (result==null) {
                return -1;
            } else {
                return result.intValue();
            }
        } else {
            return -1;
        }
    }
}