Polishing

This commit removes unnecessary not-null checks for annotation
attribute alias names.

spring-core/src/main/java/org/springframework/core/annotation/AbstractAliasAwareAnnotationAttributeExtractor.java

@@ -91,25 +91,23 @@ abstract class AbstractAliasAwareAnnotationAttributeExtractor<S> implements Anno
 		if (aliasNames != null) {
 			final Object defaultValue = AnnotationUtils.getDefaultValue(getAnnotationType(), attributeName);
 			for (String aliasName : aliasNames) {
-				if (aliasName != null) {
-					Object aliasValue = getRawAttributeValue(aliasName);
-
-					if (!ObjectUtils.nullSafeEquals(attributeValue, aliasValue) &&
-							!ObjectUtils.nullSafeEquals(attributeValue, defaultValue) &&
-							!ObjectUtils.nullSafeEquals(aliasValue, defaultValue)) {
-						String elementName = (getAnnotatedElement() != null ? getAnnotatedElement().toString() : "unknown element");
-						throw new AnnotationConfigurationException(String.format(
-								"In annotation [%s] declared on %s and synthesized from [%s], attribute '%s' and its " +
-								"alias '%s' are present with values of [%s] and [%s], but only one is permitted.",
-								getAnnotationType().getName(), elementName, getSource(), attributeName, aliasName,
-								ObjectUtils.nullSafeToString(attributeValue), ObjectUtils.nullSafeToString(aliasValue)));
-					}
-
-					// If the user didn't declare the annotation with an explicit value,
-					// use the value of the alias instead.
-					if (ObjectUtils.nullSafeEquals(attributeValue, defaultValue)) {
-						attributeValue = aliasValue;
-					}
+				Object aliasValue = getRawAttributeValue(aliasName);
+
+				if (!ObjectUtils.nullSafeEquals(attributeValue, aliasValue) &&
+						!ObjectUtils.nullSafeEquals(attributeValue, defaultValue) &&
+						!ObjectUtils.nullSafeEquals(aliasValue, defaultValue)) {
+					String elementName = (getAnnotatedElement() != null ? getAnnotatedElement().toString() : "unknown element");
+					throw new AnnotationConfigurationException(String.format(
+							"In annotation [%s] declared on %s and synthesized from [%s], attribute '%s' and its " +
+							"alias '%s' are present with values of [%s] and [%s], but only one is permitted.",
+							getAnnotationType().getName(), elementName, getSource(), attributeName, aliasName,
+							ObjectUtils.nullSafeToString(attributeValue), ObjectUtils.nullSafeToString(aliasValue)));
+				}
+
+				// If the user didn't declare the annotation with an explicit value,
+				// use the value of the alias instead.
+				if (ObjectUtils.nullSafeEquals(attributeValue, defaultValue)) {
+					attributeValue = aliasValue;
 				}
 			}
 		}

spring-core/src/main/java/org/springframework/core/annotation/MapAnnotationAttributeExtractor.java

@@ -99,13 +99,11 @@ class MapAnnotationAttributeExtractor extends AbstractAliasAwareAnnotationAttrib
 				List<String> aliasNames = attributeAliasMap.get(attributeName);
 				if (aliasNames != null) {
 					for (String aliasName : aliasNames) {
-						if (aliasName != null) {
-							Object aliasValue = attributes.get(aliasName);
-							if (aliasValue != null) {
-								attributeValue = aliasValue;
-								attributes.put(attributeName, attributeValue);
-								break;
-							}
+						Object aliasValue = attributes.get(aliasName);
+						if (aliasValue != null) {
+							attributeValue = aliasValue;
+							attributes.put(attributeName, attributeValue);
+							break;
 						}
 					}
 				}