Friends:
-- I'm developing a Chemical drawing tool and have been progressing steadily with a lot of difficulties. My technology stack is Java 8, GWT 2.8.2, GMD 2.x, Eclipse Photon, running on a MacBook Pro, and Chrome | Firefox | Opera for testing. A limited functioning pilot is running at http://peruselab.com.
I just ran into a trouble that I couldn't figure out on my own. Below are the relevant snippets of code that's causing trouble. The call (1) ActionHandlerMap.getHandler(action) is expected to return an instance of PeruseEventHandler. I expect the sequence of execution to be 1, 2, & 3. However, upon returning from 2 (verified with the debugger) I see the control going to 4 (screen clip 1) followed by throwing an exception (screen clip 2). Any idea what could be wrong? Your help will be greatly appreciated.
...
PeruseEventHandler eventHandler = ActionHandlerMap.getHandler(action); // 1
Globals.currentShape = eventHandler.handle(null, null); // 3
...
public class ActionHandlerMap {
public static final Map<Action, PeruseEventHandler> ACTION_HANDLER_MAP = new HashMap<>();
static {
ACTION_HANDLER_MAP.put(Action.DRAW_SINGLE_BOND, new SingleBondDrawingHandler());
}
public static PeruseEventHandler getHandler(Action anAction) {
return ACTION_HANDLER_MAP.get(anAction); // 2
}
}
public class Globals {
public static Action action;
public static Shape currentShape; // 4
}
Enter code here...
Screen clip 1
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