Polishing

spring-context/src/main/java/org/springframework/context/event/AbstractApplicationEventMulticaster.java

 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -16,9 +16,10 @@
 
 package org.springframework.context.event;
 
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.LinkedHashSet;
-import java.util.LinkedList;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
@@ -210,7 +211,7 @@ public abstract class AbstractApplicationEventMulticaster
 	private Collection<ApplicationListener<?>> retrieveApplicationListeners(
 			ResolvableType eventType, Class<?> sourceType, ListenerRetriever retriever) {
 
-		LinkedList<ApplicationListener<?>> allListeners = new LinkedList<ApplicationListener<?>>();
+		List<ApplicationListener<?>> allListeners = new ArrayList<ApplicationListener<?>>();
 		Set<ApplicationListener<?>> listeners;
 		Set<String> listenerBeans;
 		synchronized (this.retrievalMutex) {
@@ -345,23 +346,20 @@ public abstract class AbstractApplicationEventMulticaster
 	 */
 	private class ListenerRetriever {
 
-		public final Set<ApplicationListener<?>> applicationListeners;
+		public final Set<ApplicationListener<?>> applicationListeners = new LinkedHashSet<ApplicationListener<?>>();
 
-		public final Set<String> applicationListenerBeans;
+		public final Set<String> applicationListenerBeans = new LinkedHashSet<String>();
 
 		private final boolean preFiltered;
 
 		public ListenerRetriever(boolean preFiltered) {
-			this.applicationListeners = new LinkedHashSet<ApplicationListener<?>>();
-			this.applicationListenerBeans = new LinkedHashSet<String>();
 			this.preFiltered = preFiltered;
 		}
 
 		public Collection<ApplicationListener<?>> getApplicationListeners() {
-			LinkedList<ApplicationListener<?>> allListeners = new LinkedList<ApplicationListener<?>>();
-			for (ApplicationListener<?> listener : this.applicationListeners) {
-				allListeners.add(listener);
-			}
+			List<ApplicationListener<?>> allListeners = new ArrayList<ApplicationListener<?>>(
+					this.applicationListeners.size() + this.applicationListenerBeans.size());
+			allListeners.addAll(this.applicationListeners);
 			if (!this.applicationListenerBeans.isEmpty()) {
 				BeanFactory beanFactory = getBeanFactory();
 				for (String listenerBeanName : this.applicationListenerBeans) {

spring-core/src/test/java/org/springframework/core/env/StandardEnvironmentTests.java

 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -38,6 +38,7 @@ import static org.springframework.core.env.AbstractEnvironment.*;
  * @author Chris Beams
  * @author Juergen Hoeller
  */
+@SuppressWarnings("deprecation")
 public class StandardEnvironmentTests {
 
 	private static final String ALLOWED_PROPERTY_NAME = "theanswer";
@@ -51,7 +52,8 @@ public class StandardEnvironmentTests {
 	private static final Object NON_STRING_PROPERTY_NAME = new Object();
 	private static final Object NON_STRING_PROPERTY_VALUE = new Object();
 
-	private ConfigurableEnvironment environment = new StandardEnvironment();
+	private final ConfigurableEnvironment environment = new StandardEnvironment();
+
 
 	@Test
 	public void merge() {
@@ -129,42 +131,42 @@ public class StandardEnvironmentTests {
 		assertThat(activeProfiles.length, is(2));
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void setActiveProfiles_withNullProfileArray() {
-		environment.setActiveProfiles((String[])null);
+		environment.setActiveProfiles((String[]) null);
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void setActiveProfiles_withNullProfile() {
-		environment.setActiveProfiles((String)null);
+		environment.setActiveProfiles((String) null);
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void setActiveProfiles_withEmptyProfile() {
 		environment.setActiveProfiles("");
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void setActiveProfiles_withNotOperator() {
 		environment.setActiveProfiles("p1", "!p2");
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void setDefaultProfiles_withNullProfileArray() {
-		environment.setDefaultProfiles((String[])null);
+		environment.setDefaultProfiles((String[]) null);
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void setDefaultProfiles_withNullProfile() {
-		environment.setDefaultProfiles((String)null);
+		environment.setDefaultProfiles((String) null);
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void setDefaultProfiles_withEmptyProfile() {
 		environment.setDefaultProfiles("");
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void setDefaultProfiles_withNotOperator() {
 		environment.setDefaultProfiles("d1", "!d2");
 	}
@@ -204,7 +206,7 @@ public class StandardEnvironmentTests {
 		System.getProperties().remove(DEFAULT_PROFILES_PROPERTY_NAME);
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void defaultProfileWithCircularPlaceholder() {
 		System.setProperty(DEFAULT_PROFILES_PROPERTY_NAME, "${spring.profiles.default}");
 		try {
@@ -263,27 +265,26 @@ public class StandardEnvironmentTests {
 		assertThat(Arrays.asList(environment.getDefaultProfiles()), hasItems("pd2", "pd3"));
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void acceptsProfiles_withEmptyArgumentList() {
 		environment.acceptsProfiles();
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void acceptsProfiles_withNullArgumentList() {
-		environment.acceptsProfiles((String[])null);
+		environment.acceptsProfiles((String[]) null);
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void acceptsProfiles_withNullArgument() {
-		environment.acceptsProfiles((String)null);
+		environment.acceptsProfiles((String) null);
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void acceptsProfiles_withEmptyArgument() {
 		environment.acceptsProfiles("");
 	}
 
-
 	@Test
 	public void acceptsProfiles_activeProfileSetProgrammatically() {
 		assertThat(environment.acceptsProfiles("p1", "p2"), is(false));
@@ -321,7 +322,7 @@ public class StandardEnvironmentTests {
 		assertThat(environment.acceptsProfiles("!p1"), is(false));
 	}
 
-	@Test(expected=IllegalArgumentException.class)
+	@Test(expected = IllegalArgumentException.class)
 	public void acceptsProfiles_withInvalidNotOperator() {
 		environment.acceptsProfiles("p1", "!");
 	}
@@ -488,6 +489,7 @@ public class StandardEnvironmentTests {
 		getModifiableSystemEnvironment().remove(DISALLOWED_PROPERTY_NAME);
 	}
 
+
 	@SuppressWarnings("unchecked")
 	public static Map<String, String> getModifiableSystemEnvironment() {
 		// for os x / linux