zdm/event-bus
zdm/event-bus
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Warn about useless handler property redefinitions

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When polymorphism or a priority is defined at listener-level and then
identically defined for a specific handler, a warning is issued.

This does not affect redefinitions of default values.
This commit is contained in:
Kai S. K. Engelbart 2021-03-14 14:38:43 +01:00
parent 32dfe64c0f
commit 7357198d45
Signed by: kske
GPG Key ID: 8BEB13EC5DF7EF13
1 changed files with 39 additions and 3 deletions
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42
event-bus-proc/src/main/java/dev/kske/eventbus/proc/EventProcessor.java
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@ -65,7 +65,7 @@ public class EventProcessor extends AbstractProcessor {
// Warn the user about unused return values
if (useParameter && eventHandler.getReturnType().getKind() != TypeKind.VOID)
warning(eventHandler, "Unused return value");
warning(eventHandler, "Unused return value");
// Abort checking if the handler signature is incorrect
if (!pass)
@ -84,9 +84,45 @@ public class EventProcessor extends AbstractProcessor {
}
}
// Get the listener containing this handler
TypeElement listener = (TypeElement) eventHandler.getEnclosingElement();
// Default properties
boolean defPolymorphic = false;
int defPriority = 100;
// Listener-level polymorphism
Polymorphic listenerPolymorphic = listener.getAnnotation(Polymorphic.class);
boolean hasListenerPolymorphic = listenerPolymorphic != null;
// Listener-level priority
Priority listenerPriority = listener.getAnnotation(Priority.class);
boolean hasListenerPriority = listenerPriority != null;
// Effective polymorphism
boolean polymorphic =
hasListenerPolymorphic ? listenerPolymorphic.value() : defPolymorphic;
boolean hasHandlerPolymorphic = eventHandler.getAnnotation(Polymorphic.class) != null;
if (hasHandlerPolymorphic)
polymorphic = eventHandler.getAnnotation(Polymorphic.class).value();
// Effective priority
int priority = hasListenerPriority ? listenerPriority.value() : defPriority;
boolean hasHandlerPriority = eventHandler.getAnnotation(Priority.class) != null;
if (hasHandlerPriority)
priority = eventHandler.getAnnotation(Priority.class).value();
// Detect useless polymorphism redefinition
if (hasListenerPolymorphic && hasHandlerPolymorphic
&& listenerPolymorphic.value() == polymorphic)
warning(eventHandler, "@Polymorphism is already defined at listener level");
// Detect useless priority redefinition
if (hasListenerPriority && hasHandlerPriority && listenerPriority.value() == priority)
warning(eventHandler, "@Priority is already defined at the listener level");
// Detect missing or useless @Polymorphic
boolean polymorphic = eventHandler.getAnnotation(Polymorphic.class) != null;
Element eventElement = ((DeclaredType) eventType).asElement();
Element eventElement = ((DeclaredType) eventType).asElement();
// Check for handlers for abstract types that aren't polymorphic
if (!polymorphic && (eventElement.getKind() == ElementKind.INTERFACE