Make intermediate classes of public classes public

Backport gh-12590 to 1.5.x and also pick up a few classes that were
missed. This commit also makes a few properties bound classes public.

Closes gh-17337

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/cloudfoundry/Token.java

@@ -28,8 +28,9 @@ import org.springframework.util.StringUtils;
  * The JSON web token provided with each request that originates from Cloud Foundry.
  *
  * @author Madhura Bhave
+ * @since 1.5.22
  */
-class Token {
+public class Token {
 
 	private static final Charset UTF_8 = Charset.forName("UTF-8");
 

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/buffer/Buffer.java

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -22,8 +22,9 @@ package org.springframework.boot.actuate.metrics.buffer;
  * @param <T> the value type
  * @author Dave Syer
  * @author Phillip Webb
+ * @since 1.5.22
  */
-abstract class Buffer<T extends Number> {
+public abstract class Buffer<T extends Number> {
 
 	private volatile long timestamp;
 

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/buffer/Buffers.java

@@ -30,12 +30,16 @@ import org.springframework.lang.UsesJava8;
  * @author Dave Syer
  * @author Phillip Webb
  * @param <B> the buffer type
+ * @since 1.5.22
  */
 @UsesJava8
-abstract class Buffers<B extends Buffer<?>> {
+public abstract class Buffers<B extends Buffer<?>> {
 
 	private final ConcurrentHashMap<String, B> buffers = new ConcurrentHashMap<String, B>();
 
+	Buffers() {
+	}
+
 	public void forEach(final Predicate<String> predicate, final BiConsumer<String, B> consumer) {
 		this.buffers.forEach(new BiConsumer<String, B>() {
 

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/writer/MetricMessage.java

 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -24,8 +24,9 @@ import org.springframework.messaging.support.MessageBuilder;
  * A metric message sent via Spring Integration.
  *
  * @author Phillip Webb
+ * @since 1.5.22
  */
-class MetricMessage {
+public class MetricMessage {
 
 	private static final String METRIC_NAME = "metricName";
 

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/AbstractNestedCondition.java

@@ -40,8 +40,9 @@ import org.springframework.util.MultiValueMap;
  * Abstract base class for nested conditions.
  *
  * @author Phillip Webb
+ * @since 1.5.22
  */
-abstract class AbstractNestedCondition extends SpringBootCondition implements ConfigurationCondition {
+public abstract class AbstractNestedCondition extends SpringBootCondition implements ConfigurationCondition {
 
 	private final ConfigurationPhase configurationPhase;
 

spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/restdocs/RestDocsMockMvcBuilderCustomizer.java

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -27,8 +27,9 @@ import org.springframework.util.StringUtils;
  * A {@link MockMvcBuilderCustomizer} that configures Spring REST Docs.
  *
  * @author Andy Wilkinson
+ * @since 1.5.22
  */
-class RestDocsMockMvcBuilderCustomizer implements InitializingBean, MockMvcBuilderCustomizer {
+public class RestDocsMockMvcBuilderCustomizer implements InitializingBean, MockMvcBuilderCustomizer {
 
 	private final MockMvcRestDocumentationConfigurer delegate;
 

spring-boot/src/main/java/org/springframework/boot/web/servlet/AbstractFilterRegistrationBean.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -39,8 +39,9 @@ import org.springframework.util.Assert;
  * Servlet 3.0+ container.
  *
  * @author Phillip Webb
+ * @since 1.5.22
  */
-abstract class AbstractFilterRegistrationBean extends RegistrationBean {
+public abstract class AbstractFilterRegistrationBean extends RegistrationBean {
 
 	/**
 	 * Filters that wrap the servlet request should be ordered less than or equal to this.