public void bindActionHandler(
final Object fieldInstance,
final Class<? extends ActionHandler> actionHandlerType,
final Object[] sources,
ActionWrapper actionWrapper,
Object... viewModels)
throws IllegalAccessException, UnsupportedOperationException {
Method actionHandler = null;
Object viewModel = null;
for (Object viewModelObject : viewModels) {
actionHandler = findActionHandlerInstance(viewModelObject, actionHandlerType);
viewModel = viewModelObject;
if (actionHandler != null) {
break;
}
}
if (actionHandler == null || viewModel == null) {
throw new NoSuchElementException(
"Handler for Action "
+ actionHandlerType
+ " not found: Check annotation, instantiation and type.");
}
if (actionWrapper == null) {
throw new NoSuchElementException(
"No "
+ ActionWrapper.class.getSimpleName()
+ " for "
+ fieldInstance.getClass()
+ " found.");
}
final Method actionHandlerTarget = actionHandler;
final Object viewModelTarget = viewModel;
actionWrapper.addActionHandler(
fieldInstance,
new ActionHandler() {
@Override
public <ActionDataType> void handle(ActionDataType actionData)
throws UnsupportedOperationException {
if (circularActionStateUpdatingFields.containsKey(fieldInstance)
&& circularActionStateUpdatingFields.get(fieldInstance)) {
return;
}
if (circularActionStateUpdatingFields.containsKey(fieldInstance)) {
circularActionStateUpdatingFields.put(fieldInstance, true);
}
Object[] sourceData = new Object[sources.length];
for (int i = 0; i < sources.length; i++) {
SourceWrapper<?> sourceWrapper = null;
for (Class<?> key : sourceWrappers.keySet()) {
if (key.isAssignableFrom(sources[i].getClass())) {
sourceWrapper = sourceWrappers.get(key);
break;
}
}
if (sourceWrapper == null) {
throw new NoSuchElementException(
"No "
+ SourceWrapper.class.getSimpleName()
+ " for "
+ sources[i].getClass()
+ " found.");
}
sourceData[i] = sourceWrapper.get(sources[i]);
}
try {
if (sourceData.length != 0) {
actionHandlerTarget.invoke(viewModelTarget, sourceData);
} else {
actionHandlerTarget.invoke(viewModelTarget, actionData);
}
} catch (IllegalAccessException
| IllegalArgumentException
| InvocationTargetException
| ClassCastException e) {
throw new UnsupportedOperationException(
"Invoking "
+ ActionHandler.class.getSimpleName()
+ " "
+ actionHandlerTarget.getName()
+ " in "
+ viewModelTarget.getClass().getSimpleName()
+ " for "
+ actionHandlerType.getName()
+ " event of "
+ fieldInstance.getClass().getSimpleName()
+ " failed: check amount and type of parameters.");
} finally {
circularActionStateUpdatingFields.put(fieldInstance, false);
}
}
});
}
private static void installActionWrapper(
ActionMap map, String actionName, ActionWrapper wrapper) {
wrapper.setParent(map.get(actionName));
map.put(actionName, wrapper);
}