Polish

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

@@ -68,13 +68,13 @@ class OnJavaCondition extends SpringBootCondition {
 	 * @param version the bounds of the range
 	 * @return if this version is within the specified range
 	 */
-	private boolean isWithin(JavaVersion runningVersion, Range range, JavaVersion version) {
-		int i = runningVersion.compareTo(version);
+	private boolean isWithin(JavaVersion runningVersion, Range range,
+			JavaVersion version) {
 		if (range == Range.EQUAL_OR_NEWER) {
-			return i >= 0;
+			return runningVersion.isEqualOrNewerThan(version);
 		}
-		else if (range == Range.OLDER_THAN) {
-			return i < 0;
+		if (range == Range.OLDER_THAN) {
+			return runningVersion.isOlderThan(version);
 		}
 		throw new IllegalStateException("Unknown range " + range);
 	}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/ConditionalOnJavaTests.java

@@ -17,11 +17,7 @@
 package org.springframework.boot.autoconfigure.condition;
 
 import java.lang.reflect.Method;
-import java.net.URL;
-import java.net.URLClassLoader;
 import java.nio.file.Files;
-import java.util.Arrays;
-import java.util.List;
 import java.util.ServiceLoader;
 import java.util.function.Function;
 
@@ -110,8 +106,7 @@ public class ConditionalOnJavaTests {
 
 	private String getJavaVersion(Class<?>... hiddenClasses) throws Exception {
 		HideClassesClassLoader classLoader = new HideClassesClassLoader(hiddenClasses);
-		Class<?> javaVersionClass = classLoader
-				.loadClass(JavaVersion.class.getName());
+		Class<?> javaVersionClass = classLoader.loadClass(JavaVersion.class.getName());
 		Method getJavaVersionMethod = ReflectionUtils.findMethod(javaVersionClass,
 				"getJavaVersion");
 		Object javaVersion = ReflectionUtils.invokeMethod(getJavaVersionMethod, null);
@@ -126,34 +121,6 @@ public class ConditionalOnJavaTests {
 		assertThat(outcome.isMatch()).as(outcome.getMessage()).isEqualTo(expected);
 	}
 
-	private final class ClassHidingClassLoader extends URLClassLoader {
-
-		private final List<Class<?>> hiddenClasses;
-
-		private ClassHidingClassLoader(URL[] urls, Class<?>... hiddenClasses) {
-			super(urls, null);
-			this.hiddenClasses = Arrays.asList(hiddenClasses);
-		}
-
-		@Override
-		public Class<?> loadClass(String name) throws ClassNotFoundException {
-			if (isHidden(name)) {
-				throw new ClassNotFoundException();
-			}
-			return super.loadClass(name);
-		}
-
-		private boolean isHidden(String name) {
-			for (Class<?> hiddenClass : this.hiddenClasses) {
-				if (hiddenClass.getName().equals(name)) {
-					return true;
-				}
-			}
-			return false;
-		}
-
-	}
-
 	@Configuration
 	@ConditionalOnJava(JavaVersion.NINE)
 	static class Java9Required {

spring-boot-test/src/main/java/org/springframework/boot/test/Assume.java

@@ -36,10 +36,10 @@ public abstract class Assume {
 	 * @throws AssumptionViolatedException if the assumption fails
 	 */
 	public static void javaVersion(JavaVersion version) {
-		JavaVersion currentVersion = JavaVersion.getJavaVersion();
-		boolean outcome = currentVersion.compareTo(JavaVersion.NINE) < 0;
-		org.junit.Assume.assumeTrue(String.format(
-				"This test should run on %s (got %s)", version, currentVersion), outcome);
+		JavaVersion current = JavaVersion.getJavaVersion();
+		org.junit.Assume.assumeTrue(
+				String.format("This test should run on %s (got %s)", version, current),
+				current.isOlderThan(version));
 	}
 
 }

spring-boot/src/main/java/org/springframework/boot/system/JavaVersion.java

@@ -70,4 +70,22 @@ public enum JavaVersion {
 		return EIGHT;
 	}
 
+	/**
+	 * Return if this version is equal to or newer than a given version.
+	 * @param version the version to compare
+	 * @return {@code true} if this version is equal to or newer than {@code version}
+	 */
+	public boolean isEqualOrNewerThan(JavaVersion version) {
+		return compareTo(version) >= 0;
+	}
+
+	/**
+	 * Return if this version is older than a given version.
+	 * @param version the version to compare
+	 * @return {@code true} if this version is older than {@code version}
+	 */
+	public boolean isOlderThan(JavaVersion version) {
+		return compareTo(version) < 0;
+	}
+
 }

spring-boot/src/test/java/org/springframework/boot/system/JavaVersionTests.java

@@ -28,23 +28,53 @@ import static org.assertj.core.api.Assertions.assertThat;
 public class JavaVersionTests {
 
 	@Test
-	public void currentVersionIsAvailable() {
+	public void getJavaVersionShouldBeAvailable() {
 		assertThat(JavaVersion.getJavaVersion()).isNotNull();
 	}
 
 	@Test
-	public void java8IsOlderThanJava9() {
+	public void compareToWhenComparingSmallerToGreaterShouldBeLessThanZero() {
 		assertThat(JavaVersion.EIGHT.compareTo(JavaVersion.NINE)).isLessThan(0);
 	}
 
 	@Test
-	public void java9IsNewerThanJava8() {
+	public void compareToWhenComparingGreaterToSmallerShouldBeGreaterThanZero() {
 		assertThat(JavaVersion.NINE.compareTo(JavaVersion.EIGHT)).isGreaterThan(0);
 	}
 
 	@Test
-	public void comparisonOfSameVersion() {
+	public void compareToWhenComparingSameShouldBeZero() {
 		assertThat(JavaVersion.EIGHT.compareTo(JavaVersion.EIGHT)).isEqualTo(0);
 	}
 
+	@Test
+	public void isEqualOrNewerThanWhenComparingSameShouldBeTrue() throws Exception {
+		assertThat(JavaVersion.EIGHT.isEqualOrNewerThan(JavaVersion.EIGHT)).isTrue();
+	}
+
+	@Test
+	public void isEqualOrNewerThanWhenSmallerToGreaterShouldBeFalse() throws Exception {
+		assertThat(JavaVersion.EIGHT.isEqualOrNewerThan(JavaVersion.NINE)).isFalse();
+	}
+
+	@Test
+	public void isEqualOrNewerThanWhenGreaterToSmallerShouldBeTrue() throws Exception {
+		assertThat(JavaVersion.NINE.isEqualOrNewerThan(JavaVersion.EIGHT)).isTrue();
+	}
+
+	@Test
+	public void isOlderThanThanWhenComparingSameShouldBeFalse() throws Exception {
+		assertThat(JavaVersion.EIGHT.isOlderThan(JavaVersion.EIGHT)).isFalse();
+	}
+
+	@Test
+	public void isOlderThanWhenSmallerToGreaterShouldBeTrue() throws Exception {
+		assertThat(JavaVersion.EIGHT.isOlderThan(JavaVersion.NINE)).isTrue();
+	}
+
+	@Test
+	public void isOlderThanWhenGreaterToSmallerShouldBeFalse() throws Exception {
+		assertThat(JavaVersion.NINE.isOlderThan(JavaVersion.EIGHT)).isFalse();
+	}
+
 }