Add missing variants of getBeanNamesForType

Update `ListableBeanFactory` and `BeanFactoryUtils` to add the missing
`getBeanNamesForType` methods that accept a `ResolvableType` rather
than a `Class`.

This completes the work started in 778a0194.

Closes gh-23335

spring-beans/src/main/java/org/springframework/beans/factory/BeanFactoryUtils.java

 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -172,6 +172,44 @@ public abstract class BeanFactoryUtils {
 		return result;
 	}
 
+	/**
+	 * Get all bean names for the given type, including those defined in ancestor
+	 * factories. Will return unique names in case of overridden bean definitions.
+	 * <p>Does consider objects created by FactoryBeans if the "allowEagerInit"
+	 * flag is set, which means that FactoryBeans will get initialized. If the
+	 * object created by the FactoryBean doesn't match, the raw FactoryBean itself
+	 * will be matched against the type. If "allowEagerInit" is not set,
+	 * only raw FactoryBeans will be checked (which doesn't require initialization
+	 * of each FactoryBean).
+	 * @param lbf the bean factory
+	 * @param includeNonSingletons whether to include prototype or scoped beans too
+	 * or just singletons (also applies to FactoryBeans)
+	 * @param allowEagerInit whether to initialize <i>lazy-init singletons</i> and
+	 * <i>objects created by FactoryBeans</i> (or by factory methods with a
+	 * "factory-bean" reference) for the type check. Note that FactoryBeans need to be
+	 * eagerly initialized to determine their type: So be aware that passing in "true"
+	 * for this flag will initialize FactoryBeans and "factory-bean" references.
+	 * @param type the type that beans must match (as a {@code ResolvableType})
+	 * @return the array of matching bean names, or an empty array if none
+	 * @since 5.2
+	 * @see ListableBeanFactory#getBeanNamesForType(ResolvableType, boolean, boolean)
+	 */
+	public static String[] beanNamesForTypeIncludingAncestors(
+			ListableBeanFactory lbf, ResolvableType type, boolean includeNonSingletons, boolean allowEagerInit) {
+
+		Assert.notNull(lbf, "ListableBeanFactory must not be null");
+		String[] result = lbf.getBeanNamesForType(type, includeNonSingletons, allowEagerInit);
+		if (lbf instanceof HierarchicalBeanFactory) {
+			HierarchicalBeanFactory hbf = (HierarchicalBeanFactory) lbf;
+			if (hbf.getParentBeanFactory() instanceof ListableBeanFactory) {
+				String[] parentResult = beanNamesForTypeIncludingAncestors(
+						(ListableBeanFactory) hbf.getParentBeanFactory(), type, includeNonSingletons, allowEagerInit);
+				result = mergeNamesWithParent(result, parentResult, hbf);
+			}
+		}
+		return result;
+	}
+
 	/**
 	 * Get all bean names for the given type, including those defined in ancestor
 	 * factories. Will return unique names in case of overridden bean definitions.

spring-beans/src/main/java/org/springframework/beans/factory/ListableBeanFactory.java

@@ -116,6 +116,40 @@ public interface ListableBeanFactory extends BeanFactory {
 	 */
 	String[] getBeanNamesForType(ResolvableType type);
 
+	/**
+	 * Return the names of beans matching the given type (including subclasses),
+	 * judging from either bean definitions or the value of {@code getObjectType}
+	 * in the case of FactoryBeans.
+	 * <p><b>NOTE: This method introspects top-level beans only.</b> It does <i>not</i>
+	 * check nested beans which might match the specified type as well.
+	 * <p>Does consider objects created by FactoryBeans if the "allowEagerInit" flag is set,
+	 * which means that FactoryBeans will get initialized. If the object created by the
+	 * FactoryBean doesn't match, the raw FactoryBean itself will be matched against the
+	 * type. If "allowEagerInit" is not set, only raw FactoryBeans will be checked
+	 * (which doesn't require initialization of each FactoryBean).
+	 * <p>Does not consider any hierarchy this factory may participate in.
+	 * Use BeanFactoryUtils' {@code beanNamesForTypeIncludingAncestors}
+	 * to include beans in ancestor factories too.
+	 * <p>Note: Does <i>not</i> ignore singleton beans that have been registered
+	 * by other means than bean definitions.
+	 * <p>Bean names returned by this method should always return bean names <i>in the
+	 * order of definition</i> in the backend configuration, as far as possible.
+	 * @param type the generically typed class or interface to match
+	 * @param includeNonSingletons whether to include prototype or scoped beans too
+	 * or just singletons (also applies to FactoryBeans)
+	 * @param allowEagerInit whether to initialize <i>lazy-init singletons</i> and
+	 * <i>objects created by FactoryBeans</i> (or by factory methods with a
+	 * "factory-bean" reference) for the type check. Note that FactoryBeans need to be
+	 * eagerly initialized to determine their type: So be aware that passing in "true"
+	 * for this flag will initialize FactoryBeans and "factory-bean" references.
+	 * @return the names of beans (or objects created by FactoryBeans) matching
+	 * the given object type (including subclasses), or an empty array if none
+	 * @since 5.2
+	 * @see FactoryBean#getObjectType
+	 * @see BeanFactoryUtils#beanNamesForTypeIncludingAncestors(ListableBeanFactory, ResolvableType, boolean, boolean)
+	 */
+	String[] getBeanNamesForType(ResolvableType type, boolean includeNonSingletons, boolean allowEagerInit);
+
 	/**
 	 * Return the names of beans matching the given type (including subclasses),
 	 * judging from either bean definitions or the value of {@code getObjectType}

spring-beans/src/main/java/org/springframework/beans/factory/support/DefaultListableBeanFactory.java

@@ -463,12 +463,17 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 
 	@Override
 	public String[] getBeanNamesForType(ResolvableType type) {
+		return getBeanNamesForType(type, true, true);
+	}
+
+	@Override
+	public String[] getBeanNamesForType(ResolvableType type, boolean includeNonSingletons, boolean allowEagerInit) {
 		Class<?> resolved = type.resolve();
 		if (resolved != null && !type.hasGenerics()) {
-			return getBeanNamesForType(resolved, true, true);
+			return getBeanNamesForType(resolved, includeNonSingletons, includeNonSingletons);
 		}
 		else {
-			return doGetBeanNamesForType(type, true, true);
+			return doGetBeanNamesForType(type, includeNonSingletons, includeNonSingletons);
 		}
 	}
 

spring-beans/src/main/java/org/springframework/beans/factory/support/StaticListableBeanFactory.java

 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -329,26 +329,32 @@ public class StaticListableBeanFactory implements ListableBeanFactory {
 
 	@Override
 	public String[] getBeanNamesForType(@Nullable ResolvableType type) {
-		boolean isFactoryType = false;
-		if (type != null) {
-			Class<?> resolved = type.resolve();
-			if (resolved != null && FactoryBean.class.isAssignableFrom(resolved)) {
-				isFactoryType = true;
-			}
-		}
+		return getBeanNamesForType(type, true, true);
+	}
+
+
+	@Override
+	public String[] getBeanNamesForType(@Nullable ResolvableType type,
+			boolean includeNonSingletons, boolean allowEagerInit) {
+
+		Class<?> resolved = (type != null ? type.resolve() : null);
+		boolean isFactoryType = resolved != null && FactoryBean.class.isAssignableFrom(resolved);
 		List<String> matches = new ArrayList<>();
+
 		for (Map.Entry<String, Object> entry : this.beans.entrySet()) {
-			String name = entry.getKey();
+			String beanName = entry.getKey();
 			Object beanInstance = entry.getValue();
 			if (beanInstance instanceof FactoryBean && !isFactoryType) {
-				Class<?> objectType = ((FactoryBean<?>) beanInstance).getObjectType();
-				if (objectType != null && (type == null || type.isAssignableFrom(objectType))) {
-					matches.add(name);
+				FactoryBean<?> factoryBean = (FactoryBean<?>) beanInstance;
+				Class<?> objectType = factoryBean.getObjectType();
+				if ((includeNonSingletons || factoryBean.isSingleton()) &&
+						objectType != null && (type == null || type.isAssignableFrom(objectType))) {
+					matches.add(beanName);
 				}
 			}
 			else {
 				if (type == null || type.isInstance(beanInstance)) {
-					matches.add(name);
+					matches.add(beanName);
 				}
 			}
 		}
@@ -362,7 +368,7 @@ public class StaticListableBeanFactory implements ListableBeanFactory {
 
 	@Override
 	public String[] getBeanNamesForType(@Nullable Class<?> type, boolean includeNonSingletons, boolean allowEagerInit) {
-		return getBeanNamesForType(ResolvableType.forClass(type));
+		return getBeanNamesForType(ResolvableType.forClass(type), includeNonSingletons, allowEagerInit);
 	}
 
 	@Override

spring-beans/src/test/java/org/springframework/beans/factory/DefaultListableBeanFactoryTests.java

@@ -1751,6 +1751,8 @@ public class DefaultListableBeanFactoryTests {
 		assertThat(lbf.getBeanNamesForType(ConstructorDependencyFactoryBean.class).length).isEqualTo(1);
 		assertThat(lbf.getBeanNamesForType(ResolvableType.forClassWithGenerics(FactoryBean.class, Object.class)).length).isEqualTo(1);
 		assertThat(lbf.getBeanNamesForType(ResolvableType.forClassWithGenerics(FactoryBean.class, String.class)).length).isEqualTo(0);
+		assertThat(lbf.getBeanNamesForType(ResolvableType.forClassWithGenerics(FactoryBean.class, Object.class), true, true).length).isEqualTo(1);
+		assertThat(lbf.getBeanNamesForType(ResolvableType.forClassWithGenerics(FactoryBean.class, String.class), true, true).length).isEqualTo(0);
 	}
 
 	private RootBeanDefinition createConstructorDependencyBeanDefinition(int age) {

spring-context/src/main/java/org/springframework/context/support/AbstractApplicationContext.java

@@ -1208,6 +1208,12 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 		return getBeanFactory().getBeanNamesForType(type);
 	}
 
+	@Override
+	public String[] getBeanNamesForType(ResolvableType type, boolean includeNonSingletons, boolean allowEagerInit) {
+		assertBeanFactoryActive();
+		return getBeanFactory().getBeanNamesForType(type, includeNonSingletons, allowEagerInit);
+	}
+
 	@Override
 	public String[] getBeanNamesForType(@Nullable Class<?> type) {
 		assertBeanFactoryActive();

spring-test/src/main/java/org/springframework/test/web/servlet/setup/StubWebApplicationContext.java

@@ -251,6 +251,11 @@ class StubWebApplicationContext implements WebApplicationContext {
 		return this.beanFactory.getBeanNamesForType(type);
 	}
 
+	@Override
+	public String[] getBeanNamesForType(@Nullable ResolvableType type, boolean includeNonSingletons, boolean allowEagerInit) {
+		return this.beanFactory.getBeanNamesForType(type, includeNonSingletons, allowEagerInit);
+	}
+
 	@Override
 	public String[] getBeanNamesForType(@Nullable Class<?> type) {
 		return this.beanFactory.getBeanNamesForType(type);