Fix relaxed binding of camel-case properties

Extended RelaxedDataBinder to include a case insensitive version of
SEPARATED_TO_CAMELCASE. This allow properties of the form TEST_THE_VALUE
to to bound to a @ConfigurationProperties class with a prefix of "test"
and a field of `theValue`.

Fixes gh-2304

spring-boot/src/main/java/org/springframework/boot/bind/RelaxedDataBinder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2014 the original author or authors.
+ * Copyright 2012-2015 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.
@@ -201,7 +201,6 @@ public class RelaxedDataBinder extends DataBinder {
 	}
 
 	private String initializePath(BeanWrapper wrapper, BeanPath path, int index) {
-
 		String prefix = path.prefix(index);
 		String key = path.name(index);
 		if (path.isProperty(index)) {

spring-boot/src/main/java/org/springframework/boot/bind/RelaxedNames.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2013 the original author or authors.
+ * Copyright 2012-2015 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.
@@ -158,22 +158,34 @@ public final class RelaxedNames implements Iterable<String> {
 		SEPARATED_TO_CAMELCASE {
 			@Override
 			public String apply(String value) {
-				StringBuilder builder = new StringBuilder();
-				for (String field : value.split("[_\\-.]")) {
-					builder.append(builder.length() == 0 ? field : StringUtils
-							.capitalize(field));
-				}
-				for (String suffix : new String[] { "_", "-", "." }) {
-					if (value.endsWith(suffix)) {
-						builder.append(suffix);
-					}
-				}
-				return builder.toString();
+				return separatedToCamelCase(value, false);
+			}
+		},
+
+		CASE_INSENSITIVE_SEPARATED_TO_CAMELCASE {
+			@Override
+			public String apply(String value) {
+				return separatedToCamelCase(value, true);
 			}
 		};
 
 		public abstract String apply(String value);
 
+		private static String separatedToCamelCase(String value, boolean caseInsensitive) {
+			StringBuilder builder = new StringBuilder();
+			for (String field : value.split("[_\\-.]")) {
+				field = (caseInsensitive ? field.toLowerCase() : field);
+				builder.append(builder.length() == 0 ? field : StringUtils
+						.capitalize(field));
+			}
+			for (String suffix : new String[] { "_", "-", "." }) {
+				if (value.endsWith(suffix)) {
+					builder.append(suffix);
+				}
+			}
+			return builder.toString();
+
+		}
 	}
 
 }

spring-boot/src/test/java/org/springframework/boot/bind/RelaxedNamesTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2013 the original author or authors.
+ * Copyright 2012-2015 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.
@@ -37,6 +37,7 @@ public class RelaxedNamesTests {
 		assertThat(iterator.next(), equalTo("my-RELAXED-property"));
 		assertThat(iterator.next(), equalTo("my_RELAXED_property"));
 		assertThat(iterator.next(), equalTo("myRELAXEDProperty"));
+		assertThat(iterator.next(), equalTo("myRelaxedProperty"));
 		assertThat(iterator.next(), equalTo("my-relaxed-property"));
 		assertThat(iterator.next(), equalTo("my_relaxed_property"));
 		assertThat(iterator.next(), equalTo("myrelaxedproperty"));

spring-boot/src/test/java/org/springframework/boot/context/properties/ConfigurationPropertiesBindingPostProcessorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2014 the original author or authors.
+ * Copyright 2012-2015 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.
@@ -136,10 +136,20 @@ public class ConfigurationPropertiesBindingPostProcessorTests {
 	@Test
 	public void testPropertyWithEnum() throws Exception {
 		this.context = new AnnotationConfigApplicationContext();
-		EnvironmentTestUtils.addEnvironment(this.context, "test.value:foo");
+		EnvironmentTestUtils.addEnvironment(this.context, "test.the-value:foo");
 		this.context.register(PropertyWithEnum.class);
 		this.context.refresh();
-		assertThat(this.context.getBean(PropertyWithEnum.class).getValue(),
+		assertThat(this.context.getBean(PropertyWithEnum.class).getTheValue(),
+				equalTo(FooEnum.FOO));
+	}
+
+	@Test
+	public void testRelaxedPropertyWithEnum() throws Exception {
+		this.context = new AnnotationConfigApplicationContext();
+		EnvironmentTestUtils.addEnvironment(this.context, "TEST_THE_VALUE:FoO");
+		this.context.register(PropertyWithEnum.class);
+		this.context.refresh();
+		assertThat(this.context.getBean(PropertyWithEnum.class).getTheValue(),
 				equalTo(FooEnum.FOO));
 	}
 
@@ -349,14 +359,14 @@ public class ConfigurationPropertiesBindingPostProcessorTests {
 	@ConfigurationProperties(prefix = "test")
 	public static class PropertyWithEnum {
 
-		private FooEnum value;
+		private FooEnum theValue;
 
-		public void setValue(FooEnum value) {
-			this.value = value;
+		public void setTheValue(FooEnum value) {
+			this.theValue = value;
 		}
 
-		public FooEnum getValue() {
-			return this.value;
+		public FooEnum getTheValue() {
+			return this.theValue;
 		}
 
 	}