Support relaxed names with ConditionalOnProperty

Update ConditionalOnProperty to optionally support relaxed form names.

Fixes gh-835

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

@@ -37,9 +37,20 @@ import org.springframework.core.env.Environment;
 public @interface ConditionalOnProperty {
 
 	/**
-	 * One or more properties that must be present.
+	 * A prefix that should be applied to each property.
+	 */
+	String prefix() default "";
+
+	/**
+	 * One or more properties that must be present. If you are checking relaxed names you
+	 * should specify the property in its dashed form.
 	 * @return the property names
 	 */
 	String[] value();
 
+	/**
+	 * If relaxed names should be checked. Defaults to {@code true}.
+	 */
+	boolean relaxedNames() default true;
+
 }

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

@@ -19,9 +19,10 @@ package org.springframework.boot.autoconfigure.condition;
 import java.util.ArrayList;
 import java.util.List;
 
+import org.springframework.boot.bind.RelaxedPropertyResolver;
 import org.springframework.context.annotation.Condition;
 import org.springframework.context.annotation.ConditionContext;
-import org.springframework.core.env.Environment;
+import org.springframework.core.env.PropertyResolver;
 import org.springframework.core.type.AnnotatedTypeMetadata;
 import org.springframework.util.StringUtils;
 
@@ -29,6 +30,7 @@ import org.springframework.util.StringUtils;
  * {@link Condition} that checks if properties are defined in environment.
  * 
  * @author Maciej Walkowiak
+ * @author Phillip Webb
  * @see ConditionalOnProperty
  * @since 1.1.0
  */
@@ -38,17 +40,27 @@ class OnPropertyCondition extends SpringBootCondition {
 	public ConditionOutcome getMatchOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
 
-		String[] onProperties = (String[]) metadata.getAnnotationAttributes(
+		String prefix = (String) metadata.getAnnotationAttributes(
+				ConditionalOnProperty.class.getName()).get("prefix");
+		String[] names = (String[]) metadata.getAnnotationAttributes(
 				ConditionalOnProperty.class.getName()).get("value");
+		Boolean relaxedNames = (Boolean) metadata.getAnnotationAttributes(
+				ConditionalOnProperty.class.getName()).get("relaxedNames");
 
 		List<String> missingProperties = new ArrayList<String>();
 
-		Environment environment = context.getEnvironment();
-		for (String property : onProperties) {
-			if (!environment.containsProperty(property)
-					|| StringUtils.endsWithIgnoreCase(environment.getProperty(property),
-							"false")) {
-				missingProperties.add(property);
+		PropertyResolver resolver = context.getEnvironment();
+		if (relaxedNames) {
+			resolver = new RelaxedPropertyResolver(resolver, prefix);
+			prefix = "";
+		}
+
+		for (String name : names) {
+			name = prefix + name;
+			if (!resolver.containsProperty(name)
+					|| "false".equalsIgnoreCase(resolver.getProperty(name))) {
+				missingProperties.add(name);
+
 			}
 		}
 
@@ -56,9 +68,9 @@ class OnPropertyCondition extends SpringBootCondition {
 			return ConditionOutcome.match();
 		}
 
-		return ConditionOutcome
-				.noMatch("@ConditionalOnProperty missing required properties: "
-						+ StringUtils.arrayToCommaDelimitedString(missingProperties
-								.toArray()) + " not found");
+		return ConditionOutcome.noMatch("@ConditionalOnProperty "
+				+ "missing required properties: "
+				+ StringUtils.arrayToCommaDelimitedString(missingProperties.toArray())
+				+ " not found");
 	}
 }

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

@@ -22,7 +22,6 @@ import org.springframework.context.annotation.AnnotationConfigApplicationContext
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
-import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
@@ -36,41 +35,57 @@ public class ConditionalOnPropertyTests {
 	private AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
 
 	@Test
-	public void testBeanIsCreatedWhenAllPropertiesAreDefined() {
+	public void allPropertiesAreDefined() {
 		EnvironmentTestUtils.addEnvironment(this.context.getEnvironment(),
 				"property1=value1", "property2=value2");
-		setupContext();
+		this.context.register(MultiplePropertiesRequiredConfiguration.class);
+		this.context.refresh();
 		assertTrue(this.context.containsBean("foo"));
-		assertEquals("foo", this.context.getBean("foo"));
 	}
 
 	@Test
-	public void testBeanIsNotCreatedWhenNotAllPropertiesAreDefined() {
+	public void notAllPropertiesAreDefined() {
 		EnvironmentTestUtils.addEnvironment(this.context.getEnvironment(),
 				"property1=value1");
-		setupContext();
+		this.context.register(MultiplePropertiesRequiredConfiguration.class);
+		this.context.refresh();
 		assertFalse(this.context.containsBean("foo"));
 	}
 
 	@Test
-	public void testBeanIsNotCreatedWhenPropertyValueEqualsFalse() {
+	public void propertyValueEqualsFalse() {
 		EnvironmentTestUtils.addEnvironment(this.context.getEnvironment(),
 				"property1=false", "property2=value2");
-		setupContext();
+		this.context.register(MultiplePropertiesRequiredConfiguration.class);
+		this.context.refresh();
 		assertFalse(this.context.containsBean("foo"));
 	}
 
 	@Test
-	public void testBeanIsNotCreatedWhenPropertyValueEqualsFALSE() {
+	public void propertyValueEqualsFALSE() {
 		EnvironmentTestUtils.addEnvironment(this.context.getEnvironment(),
 				"property1=FALSE", "property2=value2");
-		setupContext();
+		this.context.register(MultiplePropertiesRequiredConfiguration.class);
+		this.context.refresh();
 		assertFalse(this.context.containsBean("foo"));
 	}
 
-	private void setupContext() {
-		this.context.register(MultiplePropertiesRequiredConfiguration.class);
+	@Test
+	public void relaxedName() throws Exception {
+		EnvironmentTestUtils.addEnvironment(this.context.getEnvironment(),
+				"spring.theRelaxedProperty=value1");
+		this.context.register(RelaxedPropertiesRequiredConfiguration.class);
 		this.context.refresh();
+		assertTrue(this.context.containsBean("foo"));
+	}
+
+	@Test
+	public void nonRelaxedName() throws Exception {
+		EnvironmentTestUtils.addEnvironment(this.context.getEnvironment(),
+				"theRelaxedProperty=value1");
+		this.context.register(NonRelaxedPropertiesRequiredConfiguration.class);
+		this.context.refresh();
+		assertFalse(this.context.containsBean("foo"));
 	}
 
 	@Configuration
@@ -84,4 +99,26 @@ public class ConditionalOnPropertyTests {
 
 	}
 
+	@Configuration
+	@ConditionalOnProperty(prefix = "spring.", value = "the-relaxed-property")
+	protected static class RelaxedPropertiesRequiredConfiguration {
+
+		@Bean
+		public String foo() {
+			return "foo";
+		}
+
+	}
+
+	@Configuration
+	@ConditionalOnProperty(value = "the-relaxed-property", relaxedNames = false)
+	protected static class NonRelaxedPropertiesRequiredConfiguration {
+
+		@Bean
+		public String foo() {
+			return "foo";
+		}
+
+	}
+
 }