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Avoid wasted memory on empty maps and sets

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This commit avoids wasted memory on empty hash maps in
MergedAnnotationReadingVisitor and empty sets in InjectionMetadata.

Closes gh-29742
This commit is contained in:
Vasiliy Kudriavtsev
2022-12-26 12:35:38 +03:00
committed by Sam Brannen
parent fd3e99c7ee
commit 3738a45658
2 changed files with 17 additions and 9 deletions
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5
spring-core/src/main/java/org/springframework/core/type/classreading/MergedAnnotationReadingVisitor.java
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@@ -19,6 +19,7 @@ package org.springframework.core.type.classreading;
import java.lang.annotation.Annotation;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
@@ -92,8 +93,10 @@ class MergedAnnotationReadingVisitor<A extends Annotation> extends AnnotationVis
@Override
public void visitEnd() {
Map<String, Object> compactedAttributes
= this.attributes.size() == 0 ? Collections.emptyMap() : this.attributes;
MergedAnnotation<A> annotation = MergedAnnotation.of(
this.classLoader, this.source, this.annotationType, this.attributes);
this.classLoader, this.source, this.annotationType, compactedAttributes);
this.consumer.accept(annotation);
}