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Refactor SourceFilteringListener use Assert.state for null check #33769

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Refactor SourceFilteringListener use Assert.state for null check #33769

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8 changes: 3 additions & 5 deletions spring-context/src/main/java/org/springframework/context/event/SourceFilteringListener.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright 2002-2023 the original author or authors.
* Copyright 2002-2024 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
Expand All @@ -21,6 +21,7 @@
import org.springframework.core.Ordered;
import org.springframework.core.ResolvableType;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

/**
* {@link org.springframework.context.ApplicationListener} decorator that filters
Expand Down Expand Up @@ -102,10 +103,7 @@ public String getListenerId() {
* @param event the event to process (matching the specified source)
*/
protected void onApplicationEventInternal(ApplicationEvent event) {
if (this.delegate == null) {
throw new IllegalStateException(
"Must specify a delegate object or override the onApplicationEventInternal method");
}
Assert.state(this.delegate != null, "Delegate must not be null");
this.delegate.onApplicationEvent(event);
}

Expand Down