Polish "Narrow the event types ConfigFileApplicationListener supports"

Closes gh-9628

spring-boot/src/main/java/org/springframework/boot/context/config/ConfigFileApplicationListener.java

@@ -62,7 +62,6 @@ import org.springframework.core.io.DefaultResourceLoader;
 import org.springframework.core.io.Resource;
 import org.springframework.core.io.ResourceLoader;
 import org.springframework.core.io.support.SpringFactoriesLoader;
-import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ResourceUtils;
 import org.springframework.util.StringUtils;
@@ -152,6 +151,17 @@ public class ConfigFileApplicationListener implements EnvironmentPostProcessor,
 
 	private final ConversionService conversionService = new DefaultConversionService();
 
+	@Override
+	public boolean supportsEventType(Class<? extends ApplicationEvent> eventType) {
+		return ApplicationEnvironmentPreparedEvent.class.isAssignableFrom(eventType) ||
+				ApplicationPreparedEvent.class.isAssignableFrom(eventType);
+	}
+
+	@Override
+	public boolean supportsSourceType(Class<?> aClass) {
+		return true;
+	}
+
 	@Override
 	public void onApplicationEvent(ApplicationEvent event) {
 		if (event instanceof ApplicationEnvironmentPreparedEvent) {
@@ -277,17 +287,6 @@ public class ConfigFileApplicationListener implements EnvironmentPostProcessor,
 		this.names = names;
 	}
 
-	@Override
-	public boolean supportsEventType(Class<? extends ApplicationEvent> eventType) {
-		return ApplicationEnvironmentPreparedEvent.class.isAssignableFrom(eventType) ||
-				ApplicationPreparedEvent.class.isAssignableFrom(eventType);
-	}
-
-	@Override
-	public boolean supportsSourceType(@Nullable Class<?> aClass) {
-		return true;
-	}
-
 	/**
 	 * {@link BeanFactoryPostProcessor} to re-order our property sources below any
 	 * {@code @PropertySource} items added by the {@link ConfigurationClassPostProcessor}.