org.springframework.beans.factory

## Interface ListableBeanFactory

- All Superinterfaces:
    BeanFactory
  All Known Subinterfaces:
    ApplicationContext, ConfigurableApplicationContext, ConfigurableListableBeanFactory, ConfigurablePortletApplicationContext, ConfigurableWebApplicationContext, WebApplicationContext
  All Known Implementing Classes:
    AbstractApplicationContext, AbstractRefreshableApplicationContext, AbstractRefreshableConfigApplicationContext, AbstractRefreshablePortletApplicationContext, AbstractRefreshableWebApplicationContext, AbstractXmlApplicationContext, AnnotationConfigApplicationContext, AnnotationConfigWebApplicationContext, ClassPathXmlApplicationContext, DefaultListableBeanFactory, FileSystemXmlApplicationContext, GenericApplicationContext, GenericGroovyApplicationContext, GenericWebApplicationContext, GenericXmlApplicationContext, ResourceAdapterApplicationContext, StaticApplicationContext, StaticListableBeanFactory, StaticPortletApplicationContext, StaticWebApplicationContext, XmlBeanFactory, XmlPortletApplicationContext, XmlWebApplicationContext

      public interface ListableBeanFactory
      extends BeanFactory

  Extension of the `BeanFactory` interface to be implemented by bean factories that can enumerate all their bean instances, rather than attempting bean lookup by name one by one as requested by clients. BeanFactory implementations that preload all their bean definitions (such as XML-based factories) may implement this interface.

  If this is a `HierarchicalBeanFactory`, the return values will not take any BeanFactory hierarchy into account, but will relate only to the beans defined in the current factory. Use the `BeanFactoryUtils` helper class to consider beans in ancestor factories too.

  The methods in this interface will just respect bean definitions of this factory. They will ignore any singleton beans that have been registered by other means like `ConfigurableBeanFactory`'s `registerSingleton` method, with the exception of `getBeanNamesOfType` and `getBeansOfType` which will check such manually registered singletons too. Of course, BeanFactory's `getBean` does allow transparent access to such special beans as well. However, in typical scenarios, all beans will be defined by external bean definitions anyway, so most applications don't need to worry about this differentiation.

  NOTE: With the exception of `getBeanDefinitionCount` and `containsBeanDefinition`, the methods in this interface are not designed for frequent invocation. Implementations may be slow.

  Since:
    16 April 2001
  Author:
    Rod Johnson, Juergen Hoeller
  See Also:
    `HierarchicalBeanFactory`, `BeanFactoryUtils`

- - ### Field Summary

    - ### Fields inherited from interface org.springframework.beans.factory.BeanFactory

      `FACTORY_BEAN_PREFIX`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `containsBeanDefinition(String beanName)` Check if this bean factory contains a bean definition with the given name.
    `<A extends Annotation> A` | `findAnnotationOnBean(String beanName, Class<A> annotationType)` Find an `Annotation` of `annotationType` on the specified bean, traversing its interfaces and super classes if no annotation can be found on the given class itself.
    `int` | `getBeanDefinitionCount()` Return the number of beans defined in the factory.
    `String[]` | `getBeanDefinitionNames()` Return the names of all beans defined in this factory.
    `String[]` | `getBeanNamesForAnnotation(Class<? extends Annotation> annotationType)` Find all names of beans whose `Class` has the supplied `Annotation` type, without creating any bean instances yet.
    `String[]` | `getBeanNamesForType(Class<?> type)` Return the names of beans matching the given type (including subclasses), judging from either bean definitions or the value of `getObjectType` in the case of FactoryBeans.
    `String[]` | `getBeanNamesForType(Class<?> 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 `getObjectType` in the case of FactoryBeans.
    `<T> Map<String,T>` | `getBeansOfType(Class<T> type)` Return the bean instances that match the given object type (including subclasses), judging from either bean definitions or the value of `getObjectType` in the case of FactoryBeans.
    `<T> Map<String,T>` | `getBeansOfType(Class<T> type, boolean includeNonSingletons, boolean allowEagerInit)` Return the bean instances that match the given object type (including subclasses), judging from either bean definitions or the value of `getObjectType` in the case of FactoryBeans.
    `Map<String,Object>` | `getBeansWithAnnotation(Class<? extends Annotation> annotationType)` Find all beans whose `Class` has the supplied `Annotation` type, returning a Map of bean names with corresponding bean instances.

    - ### Methods inherited from interface org.springframework.beans.factory.BeanFactory

      `containsBean, getAliases, getBean, getBean, getBean, getBean, getType, isPrototype, isSingleton, isTypeMatch`

- - ### Method Detail

    - #### containsBeanDefinition

          boolean containsBeanDefinition(String beanName)

      Check if this bean factory contains a bean definition with the given name.

      Does not consider any hierarchy this factory may participate in, and ignores any singleton beans that have been registered by other means than bean definitions.

      Parameters:
        `beanName` - the name of the bean to look for
      Returns:
        if this bean factory contains a bean definition with the given name
      See Also:
        `BeanFactory.containsBean(java.lang.String)`

    - #### getBeanDefinitionCount

          int getBeanDefinitionCount()

      Return the number of beans defined in the factory.

      Does not consider any hierarchy this factory may participate in, and ignores any singleton beans that have been registered by other means than bean definitions.

      Returns:
        the number of beans defined in the factory

    - #### getBeanDefinitionNames

          String[] getBeanDefinitionNames()

      Return the names of all beans defined in this factory.

      Does not consider any hierarchy this factory may participate in, and ignores any singleton beans that have been registered by other means than bean definitions.

      Returns:
        the names of all beans defined in this factory, or an empty array if none defined

    - #### getBeanNamesForType

          String[] getBeanNamesForType(Class<?> type)

      Return the names of beans matching the given type (including subclasses), judging from either bean definitions or the value of `getObjectType` in the case of FactoryBeans.

      NOTE: This method introspects top-level beans only. It does not check nested beans which might match the specified type as well.

      Does consider objects created by FactoryBeans, 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.

      Does not consider any hierarchy this factory may participate in. Use BeanFactoryUtils' `beanNamesForTypeIncludingAncestors` to include beans in ancestor factories too.

      Note: Does not ignore singleton beans that have been registered by other means than bean definitions.

      This version of `getBeanNamesForType` matches all kinds of beans, be it singletons, prototypes, or FactoryBeans. In most implementations, the result will be the same as for `getBeanNamesOfType(type, true, true)`.

      Bean names returned by this method should always return bean names in the order of definition in the backend configuration, as far as possible.

      Parameters:
        `type` - the class or interface to match, or `null` for all bean names
      Returns:
        the names of beans (or objects created by FactoryBeans) matching the given object type (including subclasses), or an empty array if none
      See Also:
        `FactoryBean.getObjectType()`, `BeanFactoryUtils.beanNamesForTypeIncludingAncestors(ListableBeanFactory, Class)`

    - #### getBeanNamesForType

          String[] getBeanNamesForType(Class<?> 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 `getObjectType` in the case of FactoryBeans.

      NOTE: This method introspects top-level beans only. It does not check nested beans which might match the specified type as well.

      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).

      Does not consider any hierarchy this factory may participate in. Use BeanFactoryUtils' `beanNamesForTypeIncludingAncestors` to include beans in ancestor factories too.

      Note: Does not ignore singleton beans that have been registered by other means than bean definitions.

      Bean names returned by this method should always return bean names in the order of definition in the backend configuration, as far as possible.

      Parameters:
        `type` - the class or interface to match, or `null` for all bean names
        `includeNonSingletons` - whether to include prototype or scoped beans too or just singletons (also applies to FactoryBeans)
        `allowEagerInit` - whether to initialize lazy-init singletons and objects created by FactoryBeans (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.
      Returns:
        the names of beans (or objects created by FactoryBeans) matching the given object type (including subclasses), or an empty array if none
      See Also:
        `FactoryBean.getObjectType()`, `BeanFactoryUtils.beanNamesForTypeIncludingAncestors(ListableBeanFactory, Class, boolean, boolean)`

    - #### getBeansOfType

          <T> Map<String,T> getBeansOfType(Class<T> type)
                                    throws BeansException

      Return the bean instances that match the given object type (including subclasses), judging from either bean definitions or the value of `getObjectType` in the case of FactoryBeans.

      NOTE: This method introspects top-level beans only. It does not check nested beans which might match the specified type as well.

      Does consider objects created by FactoryBeans, 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.

      Does not consider any hierarchy this factory may participate in. Use BeanFactoryUtils' `beansOfTypeIncludingAncestors` to include beans in ancestor factories too.

      Note: Does not ignore singleton beans that have been registered by other means than bean definitions.

      This version of getBeansOfType matches all kinds of beans, be it singletons, prototypes, or FactoryBeans. In most implementations, the result will be the same as for `getBeansOfType(type, true, true)`.

      The Map returned by this method should always return bean names and corresponding bean instances in the order of definition in the backend configuration, as far as possible.

      Parameters:
        `type` - the class or interface to match, or `null` for all concrete beans
      Returns:
        a Map with the matching beans, containing the bean names as keys and the corresponding bean instances as values
      Throws:
        `BeansException` - if a bean could not be created
      Since:
        1.1.2
      See Also:
        `FactoryBean.getObjectType()`, `BeanFactoryUtils.beansOfTypeIncludingAncestors(ListableBeanFactory, Class)`

    - #### getBeansOfType

          <T> Map<String,T> getBeansOfType(Class<T> type,
                                           boolean includeNonSingletons,
                                           boolean allowEagerInit)
                                    throws BeansException

      Return the bean instances that match the given object type (including subclasses), judging from either bean definitions or the value of `getObjectType` in the case of FactoryBeans.

      NOTE: This method introspects top-level beans only. It does not check nested beans which might match the specified type as well.

      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).

      Does not consider any hierarchy this factory may participate in. Use BeanFactoryUtils' `beansOfTypeIncludingAncestors` to include beans in ancestor factories too.

      Note: Does not ignore singleton beans that have been registered by other means than bean definitions.

      The Map returned by this method should always return bean names and corresponding bean instances in the order of definition in the backend configuration, as far as possible.

      Parameters:
        `type` - the class or interface to match, or `null` for all concrete beans
        `includeNonSingletons` - whether to include prototype or scoped beans too or just singletons (also applies to FactoryBeans)
        `allowEagerInit` - whether to initialize lazy-init singletons and objects created by FactoryBeans (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.
      Returns:
        a Map with the matching beans, containing the bean names as keys and the corresponding bean instances as values
      Throws:
        `BeansException` - if a bean could not be created
      See Also:
        `FactoryBean.getObjectType()`, `BeanFactoryUtils.beansOfTypeIncludingAncestors(ListableBeanFactory, Class, boolean, boolean)`

    - #### getBeanNamesForAnnotation

          String[] getBeanNamesForAnnotation(Class<? extends Annotation> annotationType)

      Find all names of beans whose `Class` has the supplied `Annotation` type, without creating any bean instances yet.
      Parameters:
        `annotationType` - the type of annotation to look for
      Returns:
        the names of all matching beans
      Since:
        4.0

    - #### getBeansWithAnnotation

          Map<String,Object> getBeansWithAnnotation(Class<? extends Annotation> annotationType)
                                             throws BeansException

      Find all beans whose `Class` has the supplied `Annotation` type, returning a Map of bean names with corresponding bean instances.
      Parameters:
        `annotationType` - the type of annotation to look for
      Returns:
        a Map with the matching beans, containing the bean names as keys and the corresponding bean instances as values
      Throws:
        `BeansException` - if a bean could not be created
      Since:
        3.0

    - #### findAnnotationOnBean

          <A extends Annotation> A findAnnotationOnBean(String beanName,
                                                        Class<A> annotationType)
                                                 throws NoSuchBeanDefinitionException

      Find an `Annotation` of `annotationType` on the specified bean, traversing its interfaces and super classes if no annotation can be found on the given class itself.
      Parameters:
        `beanName` - the name of the bean to look for annotations on
        `annotationType` - the annotation class to look for
      Returns:
        the annotation of the given type if found, or `null`
      Throws:
        `NoSuchBeanDefinitionException` - if there is no bean with the given name
      Since:
        3.0