org.springframework.beans.factory.support

Class StaticListableBeanFactory

java.lang.Object

org.springframework.beans.factory.support.StaticListableBeanFactory

All Implemented Interfaces:

BeanFactory, ListableBeanFactory

Direct Known Subclasses:

StubWebApplicationContext.StubBeanFactory

public class StaticListableBeanFactory
extends java.lang.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

Modifier and Type	Field and Description
private java.util.Map<java.lang.String,java.lang.Object>	beans Map from bean name to bean instance

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

FACTORY_BEAN_PREFIX

Constructor Summary

Constructors

Constructor and Description
StaticListableBeanFactory()

Method Summary

Modifier and Type	Method and Description
void	addBean(java.lang.String name, java.lang.Object bean) Add a new singleton bean.
boolean	containsBean(java.lang.String name) Does this bean factory contain a bean definition or externally registered singleton instance with the given name?
boolean	containsBeanDefinition(java.lang.String name) Check if this bean factory contains a bean definition with the given name.
<A extends java.lang.annotation.Annotation> A	findAnnotationOnBean(java.lang.String beanName, java.lang.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.
java.lang.String[]	getAliases(java.lang.String name) Return the aliases for the given bean name, if any.
<T> T	getBean(java.lang.Class<T> requiredType) Return the bean instance that uniquely matches the given object type, if any.
<T> T	getBean(java.lang.Class<T> requiredType, java.lang.Object... args) Return an instance, which may be shared or independent, of the specified bean.
java.lang.Object	getBean(java.lang.String name) Return an instance, which may be shared or independent, of the specified bean.
<T> T	getBean(java.lang.String name, java.lang.Class<T> requiredType) Return an instance, which may be shared or independent, of the specified bean.
java.lang.Object	getBean(java.lang.String name, java.lang.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.
java.lang.String[]	getBeanDefinitionNames() Return the names of all beans defined in this factory.
java.lang.String[]	getBeanNamesForAnnotation(java.lang.Class<? extends java.lang.annotation.Annotation> annotationType) Find all names of beans whose Class has the supplied Annotation type, without creating any bean instances yet.
java.lang.String[]	getBeanNamesForType(java.lang.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.
java.lang.String[]	getBeanNamesForType(java.lang.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> java.util.Map<java.lang.String,T>	getBeansOfType(java.lang.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> java.util.Map<java.lang.String,T>	getBeansOfType(java.lang.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.
java.util.Map<java.lang.String,java.lang.Object>	getBeansWithAnnotation(java.lang.Class<? extends java.lang.annotation.Annotation> annotationType) Find all beans whose Class has the supplied Annotation type, returning a Map of bean names with corresponding bean instances.
java.lang.Class<?>	getType(java.lang.String name) Determine the type of the bean with the given name.
boolean	isPrototype(java.lang.String name) Is this bean a prototype? That is, will BeanFactory.getBean(java.lang.String) always return independent instances?
boolean	isSingleton(java.lang.String name) Is this bean a shared singleton? That is, will BeanFactory.getBean(java.lang.String) always return the same instance?
boolean	isTypeMatch(java.lang.String name, java.lang.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

Field Detail

beans

private final java.util.Map<java.lang.String,java.lang.Object> beans

Map from bean name to bean instance

Constructor Detail

StaticListableBeanFactory

public StaticListableBeanFactory()

Method Detail

addBean

public void addBean(java.lang.String name,
                    java.lang.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 java.lang.Object getBean(java.lang.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(java.lang.String name,
                     java.lang.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(java.lang.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 java.lang.Object getBean(java.lang.String name,
                                java.lang.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

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

getBean

public <T> T getBean(java.lang.Class<T> requiredType,
                     java.lang.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:

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.

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(java.lang.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(java.lang.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(java.lang.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(java.lang.String name,
                           java.lang.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 java.lang.Class<?> getType(java.lang.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 java.lang.String[] getAliases(java.lang.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(java.lang.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 java.lang.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 java.lang.String[] getBeanNamesForType(java.lang.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 getBeanNamesForType(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 java.lang.String[] getBeanNamesForType(java.lang.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> java.util.Map<java.lang.String,T> getBeansOfType(java.lang.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> java.util.Map<java.lang.String,T> getBeansOfType(java.lang.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)

getBeanNamesForAnnotation

public java.lang.String[] getBeanNamesForAnnotation(java.lang.Class<? extends java.lang.annotation.Annotation> annotationType)

Description copied from interface: ListableBeanFactory

Find all names of beans whose Class has the supplied Annotation type, without creating any bean instances yet.

Specified by:

getBeanNamesForAnnotation in interface ListableBeanFactory

Parameters:

annotationType - the type of annotation to look for

Returns:

the names of all matching beans

getBeansWithAnnotation

public java.util.Map<java.lang.String,java.lang.Object> getBeansWithAnnotation(java.lang.Class<? extends java.lang.annotation.Annotation> annotationType)
                                                                        throws BeansException

Description copied from interface: ListableBeanFactory

Find all beans whose Class has the supplied Annotation type, returning a Map of bean names with corresponding bean instances.

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 java.lang.annotation.Annotation> A findAnnotationOnBean(java.lang.String beanName,
                                                                          java.lang.Class<A> annotationType)
                                                                   throws NoSuchBeanDefinitionException

Description copied from interface: ListableBeanFactory

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.

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 if found, or null

Throws:

NoSuchBeanDefinitionException - if there is no bean with the given name