Add String type attribute to OnBean conditions

Fixes gh-1381

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

@@ -46,6 +46,13 @@ public @interface ConditionalOnBean {
 	 */
 	Class<?>[] value() default {};
 
+	/**
+	 * The class type names of bean that should be checked. The condition matches when any
+	 * of the classes specified is contained in the {@link ApplicationContext}.
+	 * @return the class type names of beans to check
+	 */
+	String[] type() default {};
+
 	/**
 	 * The annotation type decorating a bean that should be checked. The condition matches
 	 * when each class specified is missing from beans in the {@link ApplicationContext}.

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

@@ -46,6 +46,13 @@ public @interface ConditionalOnMissingBean {
 	 */
 	Class<?>[] value() default {};
 
+	/**
+	 * The class type names of bean that should be checked. The condition matches when
+	 * each class specified is missing in the {@link ApplicationContext}.
+	 * @return the class type names of beans to check
+	 */
+	String[] type() default {};
+
 	/**
 	 * The annotation type decorating a bean that should be checked. The condition matches
 	 * when each class specified is missing from all beans in the

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

@@ -290,6 +290,7 @@ class OnBeanCondition extends SpringBootCondition implements ConfigurationCondit
 					.getAllAnnotationAttributes(annotationType.getName(), true);
 			collect(attributes, "name", this.names);
 			collect(attributes, "value", this.types);
+			collect(attributes, "type", this.types);
 			collect(attributes, "annotation", this.annotations);
 			if (this.types.isEmpty() && this.names.isEmpty()) {
 				addDeducedBeanType(context, metadata, this.types);

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

@@ -76,6 +76,14 @@ public class ConditionalOnBeanTests {
 		assertEquals("bar", this.context.getBean("bar"));
 	}
 
+	@Test
+	public void testClassOnBeanClassNameCondition() {
+		this.context.register(FooConfiguration.class, OnBeanClassNameConfiguration.class);
+		this.context.refresh();
+		assertTrue(this.context.containsBean("bar"));
+		assertEquals("bar", this.context.getBean("bar"));
+	}
+
 	@Test
 	public void testOnBeanConditionWithXml() {
 		this.context.register(XmlConfiguration.class, OnBeanNameConfiguration.class);
@@ -100,6 +108,14 @@ public class ConditionalOnBeanTests {
 		assertEquals("bar", this.context.getBean("bar"));
 	}
 
+	@Test
+	public void testOnMissingBeanType() throws Exception {
+		this.context.register(FooConfiguration.class,
+				OnBeanMissingClassConfiguration.class);
+		this.context.refresh();
+		assertFalse(this.context.containsBean("bar"));
+	}
+
 	@Configuration
 	@ConditionalOnBean(name = "foo")
 	protected static class OnBeanNameConfiguration {
@@ -136,6 +152,24 @@ public class ConditionalOnBeanTests {
 		}
 	}
 
+	@Configuration
+	@ConditionalOnBean(type = "java.lang.String")
+	protected static class OnBeanClassNameConfiguration {
+		@Bean
+		public String bar() {
+			return "bar";
+		}
+	}
+
+	@Configuration
+	@ConditionalOnBean(type = "some.type.Missing")
+	protected static class OnBeanMissingClassConfiguration {
+		@Bean
+		public String bar() {
+			return "bar";
+		}
+	}
+
 	@Configuration
 	@EnableScheduling
 	protected static class FooConfiguration {