Extract configuration of MessageSourceAutoConfiguration

This commit extracts the configuration of MessageSourceAutoConfiguration
in a dedicated object.

Closes gh-9666

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/context/MessageSourceAutoConfiguration.java

@@ -16,8 +16,6 @@
 
 package org.springframework.boot.autoconfigure.context;
 
-import java.nio.charset.Charset;
-
 import org.springframework.boot.autoconfigure.AutoConfigureOrder;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionMessage;
@@ -53,98 +51,33 @@ import org.springframework.util.StringUtils;
 @AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)
 @Conditional(ResourceBundleCondition.class)
 @EnableConfigurationProperties
-@ConfigurationProperties(prefix = "spring.messages")
 public class MessageSourceAutoConfiguration {
 
 	private static final Resource[] NO_RESOURCES = {};
 
-	/**
-	 * Comma-separated list of basenames, each following the ResourceBundle convention.
-	 * Essentially a fully-qualified classpath location. If it doesn't contain a package
-	 * qualifier (such as "org.mypackage"), it will be resolved from the classpath root.
-	 */
-	private String basename = "messages";
-
-	/**
-	 * Message bundles encoding.
-	 */
-	private Charset encoding = Charset.forName("UTF-8");
-
-	/**
-	 * Loaded resource bundle files cache expiration, in seconds. When set to -1, bundles
-	 * are cached forever.
-	 */
-	private int cacheSeconds = -1;
-
-	/**
-	 * Set whether to fall back to the system Locale if no files for a specific Locale
-	 * have been found. if this is turned off, the only fallback will be the default file
-	 * (e.g. "messages.properties" for basename "messages").
-	 */
-	private boolean fallbackToSystemLocale = true;
-
-	/**
-	 * Set whether to always apply the MessageFormat rules, parsing even messages without
-	 * arguments.
-	 */
-	private boolean alwaysUseMessageFormat = false;
+	@Bean
+	@ConfigurationProperties(prefix = "spring.messages")
+	public MessageSourceProperties messageSourceProperties() {
+		return new MessageSourceProperties();
+	}
 
 	@Bean
 	public MessageSource messageSource() {
+		MessageSourceProperties properties = messageSourceProperties();
 		ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
-		if (StringUtils.hasText(this.basename)) {
+		if (StringUtils.hasText(properties.getBasename())) {
 			messageSource.setBasenames(StringUtils.commaDelimitedListToStringArray(
-					StringUtils.trimAllWhitespace(this.basename)));
+					StringUtils.trimAllWhitespace(properties.getBasename())));
 		}
-		if (this.encoding != null) {
-			messageSource.setDefaultEncoding(this.encoding.name());
+		if (properties.getEncoding() != null) {
+			messageSource.setDefaultEncoding(properties.getEncoding().name());
 		}
-		messageSource.setFallbackToSystemLocale(this.fallbackToSystemLocale);
-		messageSource.setCacheSeconds(this.cacheSeconds);
-		messageSource.setAlwaysUseMessageFormat(this.alwaysUseMessageFormat);
+		messageSource.setFallbackToSystemLocale(properties.isFallbackToSystemLocale());
+		messageSource.setCacheSeconds(properties.getCacheSeconds());
+		messageSource.setAlwaysUseMessageFormat(properties.isAlwaysUseMessageFormat());
 		return messageSource;
 	}
 
-	public String getBasename() {
-		return this.basename;
-	}
-
-	public void setBasename(String basename) {
-		this.basename = basename;
-	}
-
-	public Charset getEncoding() {
-		return this.encoding;
-	}
-
-	public void setEncoding(Charset encoding) {
-		this.encoding = encoding;
-	}
-
-	public int getCacheSeconds() {
-		return this.cacheSeconds;
-	}
-
-	public void setCacheSeconds(int cacheSeconds) {
-		this.cacheSeconds = cacheSeconds;
-	}
-
-	public boolean isFallbackToSystemLocale() {
-		return this.fallbackToSystemLocale;
-	}
-
-	public void setFallbackToSystemLocale(boolean fallbackToSystemLocale) {
-		this.fallbackToSystemLocale = fallbackToSystemLocale;
-	}
-
-	public boolean isAlwaysUseMessageFormat() {
-		return this.alwaysUseMessageFormat;
-	}
-
-	public void setAlwaysUseMessageFormat(boolean alwaysUseMessageFormat) {
-		this.alwaysUseMessageFormat = alwaysUseMessageFormat;
-	}
-
 	protected static class ResourceBundleCondition extends SpringBootCondition {
 
 		private static ConcurrentReferenceHashMap<String, ConditionOutcome> cache = new ConcurrentReferenceHashMap<>();

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/context/MessageSourceProperties.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2012-2017 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.context;
+
+import java.nio.charset.Charset;
+
+/**
+ * Configuration properties for Message Source.
+ *
+ * @author Stephane Nicoll
+ * @since 2.0.0
+ */
+public class MessageSourceProperties {
+
+	/**
+	 * Comma-separated list of basenames, each following the ResourceBundle convention.
+	 * Essentially a fully-qualified classpath location. If it doesn't contain a package
+	 * qualifier (such as "org.mypackage"), it will be resolved from the classpath root.
+	 */
+	private String basename = "messages";
+
+	/**
+	 * Message bundles encoding.
+	 */
+	private Charset encoding = Charset.forName("UTF-8");
+
+	/**
+	 * Loaded resource bundle files cache expiration, in seconds. When set to -1, bundles
+	 * are cached forever.
+	 */
+	private int cacheSeconds = -1;
+
+	/**
+	 * Set whether to fall back to the system Locale if no files for a specific Locale
+	 * have been found. if this is turned off, the only fallback will be the default file
+	 * (e.g. "messages.properties" for basename "messages").
+	 */
+	private boolean fallbackToSystemLocale = true;
+
+	/**
+	 * Set whether to always apply the MessageFormat rules, parsing even messages without
+	 * arguments.
+	 */
+	private boolean alwaysUseMessageFormat = false;
+
+	public String getBasename() {
+		return this.basename;
+	}
+
+	public void setBasename(String basename) {
+		this.basename = basename;
+	}
+
+	public Charset getEncoding() {
+		return this.encoding;
+	}
+
+	public void setEncoding(Charset encoding) {
+		this.encoding = encoding;
+	}
+
+	public int getCacheSeconds() {
+		return this.cacheSeconds;
+	}
+
+	public void setCacheSeconds(int cacheSeconds) {
+		this.cacheSeconds = cacheSeconds;
+	}
+
+	public boolean isFallbackToSystemLocale() {
+		return this.fallbackToSystemLocale;
+	}
+
+	public void setFallbackToSystemLocale(boolean fallbackToSystemLocale) {
+		this.fallbackToSystemLocale = fallbackToSystemLocale;
+	}
+
+	public boolean isAlwaysUseMessageFormat() {
+		return this.alwaysUseMessageFormat;
+	}
+
+	public void setAlwaysUseMessageFormat(boolean alwaysUseMessageFormat) {
+		this.alwaysUseMessageFormat = alwaysUseMessageFormat;
+	}
+
+}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/context/MessageSourceAutoConfigurationTests.java

@@ -22,6 +22,7 @@ import org.junit.After;
 import org.junit.Ignore;
 import org.junit.Test;
 
+import org.springframework.beans.DirectFieldAccessor;
 import org.springframework.boot.test.util.TestPropertyValues;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.MessageSource;
@@ -104,31 +105,41 @@ public class MessageSourceAutoConfigurationTests {
 	@Test
 	public void testFallbackDefault() throws Exception {
 		load("spring.messages.basename:test/messages");
-		assertThat(this.context.getBean(MessageSourceAutoConfiguration.class)
-				.isFallbackToSystemLocale()).isTrue();
+		assertThat(isFallbackToSystemLocale(this.context.getBean(MessageSource.class)))
+				.isTrue();
 	}
 
 	@Test
 	public void testFallbackTurnOff() throws Exception {
 		load("spring.messages.basename:test/messages",
 				"spring.messages.fallback-to-system-locale:false");
-		assertThat(this.context.getBean(MessageSourceAutoConfiguration.class)
-				.isFallbackToSystemLocale()).isFalse();
+		assertThat(isFallbackToSystemLocale(this.context.getBean(MessageSource.class)))
+				.isFalse();
 	}
 
 	@Test
 	public void testFormatMessageDefault() throws Exception {
 		load("spring.messages.basename:test/messages");
-		assertThat(this.context.getBean(MessageSourceAutoConfiguration.class)
-				.isAlwaysUseMessageFormat()).isFalse();
+		assertThat(isAlwaysUseMessageFormat(this.context.getBean(MessageSource.class)))
+				.isFalse();
 	}
 
 	@Test
 	public void testFormatMessageOn() throws Exception {
 		load("spring.messages.basename:test/messages",
 				"spring.messages.always-use-message-format:true");
-		assertThat(this.context.getBean(MessageSourceAutoConfiguration.class)
-				.isAlwaysUseMessageFormat()).isTrue();
+		assertThat(isAlwaysUseMessageFormat(this.context.getBean(MessageSource.class)))
+				.isTrue();
+	}
+
+	private boolean isFallbackToSystemLocale(MessageSource messageSource) {
+		return (boolean) new DirectFieldAccessor(messageSource)
+				.getPropertyValue("fallbackToSystemLocale");
+	}
+
+	private boolean isAlwaysUseMessageFormat(MessageSource messageSource) {
+		return (boolean) new DirectFieldAccessor(messageSource)
+				.getPropertyValue("alwaysUseMessageFormat");
 	}
 
 	@Test