org.springframework.beans.factory.support

## Class StaticListableBeanFactory

- java.lang.Object
- - org.springframework.beans.factory.support.StaticListableBeanFactory

- All Implemented Interfaces:
    BeanFactory, ListableBeanFactory

      public class StaticListableBeanFactory
      extends Object
      implements ListableBeanFactory

  Static `BeanFactory` implementation which allows to register existing singleton instances programmatically. Does not have support for prototype beans or aliases.

  Serves as example for a simple implementation of the `ListableBeanFactory` interface, managing existing bean instances rather than creating new ones based on bean definitions, and not implementing any extended SPI interfaces (such as `ConfigurableBeanFactory`).

  For a full-fledged factory based on bean definitions, have a look at `DefaultListableBeanFactory`.

  Since:
    06.01.2003
  Author:
    Rod Johnson, Juergen Hoeller
  See Also:
    `DefaultListableBeanFactory`

- - ### Field Summary

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

      `FACTORY_BEAN_PREFIX`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `StaticListableBeanFactory()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addBean(String name, Object bean)` Add a new singleton bean.
    `boolean` | `containsBean(String name)` Does this bean factory contain a bean definition or externally registered singleton instance with the given name?
    `boolean` | `containsBeanDefinition(String name)` Check if this bean factory contains a bean definition with the given name.
    `<A extends Annotation> A` | `findAnnotationOnBean(String beanName, Class<A> annotationType)` Find a `Annotation` of `annotationType` on the specified bean, traversing its interfaces and super classes if no annotation can be found on the given class itself.
    `String[]` | `getAliases(String name)` Return the aliases for the given bean name, if any.
    `<T> T` | `getBean(Class<T> requiredType)` Return the bean instance that uniquely matches the given object type, if any.
    `Object` | `getBean(String name)` Return an instance, which may be shared or independent, of the specified bean.
    `<T> T` | `getBean(String name, Class<T> requiredType)` Return an instance, which may be shared or independent, of the specified bean.
    `Object` | `getBean(String name, Object... args)` Return an instance, which may be shared or independent, of the specified bean.
    `int` | `getBeanDefinitionCount()` Return the number of beans defined in the factory.
    `String[]` | `getBeanDefinitionNames()` Return the names of all beans defined in this factory.
    `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 includeFactoryBeans)` 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 includeFactoryBeans)` 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.
    `Class<?>` | `getType(String name)` Determine the type of the bean with the given name.
    `boolean` | `isPrototype(String name)` Is this bean a prototype? That is, will `BeanFactory.getBean(java.lang.String)` always return independent instances?
    `boolean` | `isSingleton(String name)` Is this bean a shared singleton? That is, will `BeanFactory.getBean(java.lang.String)` always return the same instance?
    `boolean` | `isTypeMatch(String name, Class<?> targetType)` Check whether the bean with the given name matches the specified type.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### StaticListableBeanFactory

          public StaticListableBeanFactory()

  - ### Method Detail

    - #### addBean

          public void addBean(String name,
                     Object bean)

      Add a new singleton bean. Will overwrite any existing instance for the given name.
      Parameters:
        `name` - the name of the bean
        `bean` - the bean instance

    - #### getBean

          public Object getBean(String name)
                         throws BeansException

      Description copied from interface: `BeanFactory`
      Return an instance, which may be shared or independent, of the specified bean.

      This method allows a Spring BeanFactory to be used as a replacement for the Singleton or Prototype design pattern. Callers may retain references to returned objects in the case of Singleton beans.

      Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

      Specified by:
        `getBean` in interface `BeanFactory`
      Parameters:
        `name` - the name of the bean to retrieve
      Returns:
        an instance of the bean
      Throws:
        `NoSuchBeanDefinitionException` - if there is no bean definition with the specified name
        `BeansException` - if the bean could not be obtained

    - #### getBean

          public <T> T getBean(String name,
                      Class<T> requiredType)
                    throws BeansException

      Description copied from interface: `BeanFactory`
      Return an instance, which may be shared or independent, of the specified bean.

      Behaves the same as `BeanFactory.getBean(String)`, but provides a measure of type safety by throwing a BeanNotOfRequiredTypeException if the bean is not of the required type. This means that ClassCastException can't be thrown on casting the result correctly, as can happen with `BeanFactory.getBean(String)`.

      Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

      Specified by:
        `getBean` in interface `BeanFactory`
      Parameters:
        `name` - the name of the bean to retrieve
        `requiredType` - type the bean must match. Can be an interface or superclass of the actual class, or `null` for any match. For example, if the value is `Object.class`, this method will succeed whatever the class of the returned instance.
      Returns:
        an instance of the bean
      Throws:
        `NoSuchBeanDefinitionException` - if there is no such bean definition
        `BeanNotOfRequiredTypeException` - if the bean is not of the required type
        `BeansException` - if the bean could not be created

    - #### getBean

          public <T> T getBean(Class<T> requiredType)
                    throws BeansException

      Description copied from interface: `BeanFactory`
      Return the bean instance that uniquely matches the given object type, if any.
      Specified by:
        `getBean` in interface `BeanFactory`
      Parameters:
        `requiredType` - type the bean must match; can be an interface or superclass. `null` is disallowed.

        This method goes into `ListableBeanFactory` by-type lookup territory but may also be translated into a conventional by-name lookup based on the name of the given type. For more extensive retrieval operations across sets of beans, use `ListableBeanFactory` and/or `BeanFactoryUtils`.

      Returns:
        an instance of the single bean matching the required type
      Throws:
        `NoSuchBeanDefinitionException` - if no bean of the given type was found
        `NoUniqueBeanDefinitionException` - if more than one bean of the given type was found
        `BeansException`
      See Also:
        `ListableBeanFactory`

    - #### getBean

          public Object getBean(String name,
                       Object... args)
                         throws BeansException

      Description copied from interface: `BeanFactory`
      Return an instance, which may be shared or independent, of the specified bean.

      Allows for specifying explicit constructor arguments / factory method arguments, overriding the specified default arguments (if any) in the bean definition.

      Specified by:
        `getBean` in interface `BeanFactory`
      Parameters:
        `name` - the name of the bean to retrieve
        `args` - arguments to use if creating a prototype using explicit arguments to a static factory method. It is invalid to use a non-null args value in any other case.
      Returns:
        an instance of the bean
      Throws:
        `NoSuchBeanDefinitionException` - if there is no such bean definition
        `BeanDefinitionStoreException` - if arguments have been given but the affected bean isn't a prototype
        `BeansException` - if the bean could not be created

    - #### containsBean

          public boolean containsBean(String name)

      Description copied from interface: `BeanFactory`
      Does this bean factory contain a bean definition or externally registered singleton instance with the given name?

      If the given name is an alias, it will be translated back to the corresponding canonical bean name.

      If this factory is hierarchical, will ask any parent factory if the bean cannot be found in this factory instance.

      If a bean definition or singleton instance matching the given name is found, this method will return `true` whether the named bean definition is concrete or abstract, lazy or eager, in scope or not. Therefore, note that a `true` return value from this method does not necessarily indicate that `BeanFactory.getBean(java.lang.String)` will be able to obtain an instance for the same name.

      Specified by:
        `containsBean` in interface `BeanFactory`
      Parameters:
        `name` - the name of the bean to query
      Returns:
        whether a bean with the given name is present

    - #### isSingleton

          public boolean isSingleton(String name)
                              throws NoSuchBeanDefinitionException

      Description copied from interface: `BeanFactory`
      Is this bean a shared singleton? That is, will `BeanFactory.getBean(java.lang.String)` always return the same instance?

      Note: This method returning `false` does not clearly indicate independent instances. It indicates non-singleton instances, which may correspond to a scoped bean as well. Use the `BeanFactory.isPrototype(java.lang.String)` operation to explicitly check for independent instances.

      Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

      Specified by:
        `isSingleton` in interface `BeanFactory`
      Parameters:
        `name` - the name of the bean to query
      Returns:
        whether this bean corresponds to a singleton instance
      Throws:
        `NoSuchBeanDefinitionException` - if there is no bean with the given name
      See Also:
        `BeanFactory.getBean(java.lang.String)`, `BeanFactory.isPrototype(java.lang.String)`

    - #### isPrototype

          public boolean isPrototype(String name)
                              throws NoSuchBeanDefinitionException

      Description copied from interface: `BeanFactory`
      Is this bean a prototype? That is, will `BeanFactory.getBean(java.lang.String)` always return independent instances?

      Note: This method returning `false` does not clearly indicate a singleton object. It indicates non-independent instances, which may correspond to a scoped bean as well. Use the `BeanFactory.isSingleton(java.lang.String)` operation to explicitly check for a shared singleton instance.

      Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

      Specified by:
        `isPrototype` in interface `BeanFactory`
      Parameters:
        `name` - the name of the bean to query
      Returns:
        whether this bean will always deliver independent instances
      Throws:
        `NoSuchBeanDefinitionException` - if there is no bean with the given name
      See Also:
        `BeanFactory.getBean(java.lang.String)`, `BeanFactory.isSingleton(java.lang.String)`

    - #### isTypeMatch

          public boolean isTypeMatch(String name,
                            Class<?> targetType)
                              throws NoSuchBeanDefinitionException

      Description copied from interface: `BeanFactory`
      Check whether the bean with the given name matches the specified type. More specifically, check whether a `BeanFactory.getBean(java.lang.String)` call for the given name would return an object that is assignable to the specified target type.

      Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

      Specified by:
        `isTypeMatch` in interface `BeanFactory`
      Parameters:
        `name` - the name of the bean to query
        `targetType` - the type to match against
      Returns:
        `true` if the bean type matches, `false` if it doesn't match or cannot be determined yet
      Throws:
        `NoSuchBeanDefinitionException` - if there is no bean with the given name
      See Also:
        `BeanFactory.getBean(java.lang.String)`, `BeanFactory.getType(java.lang.String)`

    - #### getType

          public Class<?> getType(String name)
                           throws NoSuchBeanDefinitionException

      Description copied from interface: `BeanFactory`
      Determine the type of the bean with the given name. More specifically, determine the type of object that `BeanFactory.getBean(java.lang.String)` would return for the given name.

      For a `FactoryBean`, return the type of object that the FactoryBean creates, as exposed by `FactoryBean.getObjectType()`.

      Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

      Specified by:
        `getType` in interface `BeanFactory`
      Parameters:
        `name` - the name of the bean to query
      Returns:
        the type of the bean, or `null` if not determinable
      Throws:
        `NoSuchBeanDefinitionException` - if there is no bean with the given name
      See Also:
        `BeanFactory.getBean(java.lang.String)`, `BeanFactory.isTypeMatch(java.lang.String, java.lang.Class<?>)`

    - #### getAliases

          public String[] getAliases(String name)

      Description copied from interface: `BeanFactory`
      Return the aliases for the given bean name, if any. All of those aliases point to the same bean when used in a `BeanFactory.getBean(java.lang.String)` call.

      If the given name is an alias, the corresponding original bean name and other aliases (if any) will be returned, with the original bean name being the first element in the array.

      Will ask the parent factory if the bean cannot be found in this factory instance.

      Specified by:
        `getAliases` in interface `BeanFactory`
      Parameters:
        `name` - the bean name to check for aliases
      Returns:
        the aliases, or an empty array if none
      See Also:
        `BeanFactory.getBean(java.lang.String)`

    - #### containsBeanDefinition

          public boolean containsBeanDefinition(String name)

      Description copied from interface: `ListableBeanFactory`
      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.

      Specified by:
        `containsBeanDefinition` in interface `ListableBeanFactory`
      Parameters:
        `name` - 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

          public int getBeanDefinitionCount()

      Description copied from interface: `ListableBeanFactory`
      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.

      Specified by:
        `getBeanDefinitionCount` in interface `ListableBeanFactory`
      Returns:
        the number of beans defined in the factory

    - #### getBeanDefinitionNames

          public String[] getBeanDefinitionNames()

      Description copied from interface: `ListableBeanFactory`
      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.

      Specified by:
        `getBeanDefinitionNames` in interface `ListableBeanFactory`
      Returns:
        the names of all beans defined in this factory, or an empty array if none defined

    - #### getBeanNamesForType

          public String[] getBeanNamesForType(Class<?> type)

      Description copied from interface: `ListableBeanFactory`
      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.

      Specified by:
        `getBeanNamesForType` in interface `ListableBeanFactory`
      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

          public String[] getBeanNamesForType(Class<?> type,
                                     boolean includeNonSingletons,
                                     boolean includeFactoryBeans)

      Description copied from interface: `ListableBeanFactory`
      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.

      Specified by:
        `getBeanNamesForType` in interface `ListableBeanFactory`
      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)
        `includeFactoryBeans` - 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

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

      Description copied from interface: `ListableBeanFactory`
      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.

      Specified by:
        `getBeansOfType` in interface `ListableBeanFactory`
      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
      See Also:
        `FactoryBean.getObjectType()`, `BeanFactoryUtils.beansOfTypeIncludingAncestors(ListableBeanFactory, Class)`

    - #### getBeansOfType

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

      Description copied from interface: `ListableBeanFactory`
      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.

      Specified by:
        `getBeansOfType` in interface `ListableBeanFactory`
      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)
        `includeFactoryBeans` - 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)`

    - #### getBeansWithAnnotation

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

      Description copied from interface: `ListableBeanFactory`
      Find all beans whose `Class` has the supplied `Annotation` type.
      Specified by:
        `getBeansWithAnnotation` in interface `ListableBeanFactory`
      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

    - #### findAnnotationOnBean

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

      Description copied from interface: `ListableBeanFactory`
      Find a `Annotation` of `annotationType` on the specified bean, traversing its interfaces and super classes if no annotation can be found on the given class itself.
      Specified by:
        `findAnnotationOnBean` in interface `ListableBeanFactory`
      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 found, or `null`