org.springframework.beans.factory

Class BeanFactoryUtils

java.lang.Object

org.springframework.beans.factory.BeanFactoryUtils

public abstract class BeanFactoryUtils
extends java.lang.Object

Convenience methods operating on bean factories, in particular on the ListableBeanFactory interface.

Returns bean counts, bean names or bean instances, taking into account the nesting hierarchy of a bean factory (which the methods defined on the ListableBeanFactory interface don't, in contrast to the methods defined on the BeanFactory interface).

Since:

04.07.2003

Author:

Rod Johnson, Juergen Hoeller, Chris Beams

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	GENERATED_BEAN_NAME_SEPARATOR Separator for generated bean names.

Constructor Summary

Constructors

Constructor and Description
BeanFactoryUtils()

Method Summary

Modifier and Type	Method and Description
static java.lang.String[]	beanNamesForTypeIncludingAncestors(ListableBeanFactory lbf, java.lang.Class<?> type) Get all bean names for the given type, including those defined in ancestor factories.
static java.lang.String[]	beanNamesForTypeIncludingAncestors(ListableBeanFactory lbf, java.lang.Class<?> type, boolean includeNonSingletons, boolean allowEagerInit) Get all bean names for the given type, including those defined in ancestor factories.
static java.lang.String[]	beanNamesForTypeIncludingAncestors(ListableBeanFactory lbf, ResolvableType type) Get all bean names for the given type, including those defined in ancestor factories.
static java.lang.String[]	beanNamesIncludingAncestors(ListableBeanFactory lbf) Return all bean names in the factory, including ancestor factories.
static <T> T	beanOfType(ListableBeanFactory lbf, java.lang.Class<T> type) Return a single bean of the given type or subtypes, not looking in ancestor factories.
static <T> T	beanOfType(ListableBeanFactory lbf, java.lang.Class<T> type, boolean includeNonSingletons, boolean allowEagerInit) Return a single bean of the given type or subtypes, not looking in ancestor factories.
static <T> T	beanOfTypeIncludingAncestors(ListableBeanFactory lbf, java.lang.Class<T> type) Return a single bean of the given type or subtypes, also picking up beans defined in ancestor bean factories if the current bean factory is a HierarchicalBeanFactory.
static <T> T	beanOfTypeIncludingAncestors(ListableBeanFactory lbf, java.lang.Class<T> type, boolean includeNonSingletons, boolean allowEagerInit) Return a single bean of the given type or subtypes, also picking up beans defined in ancestor bean factories if the current bean factory is a HierarchicalBeanFactory.
static <T> java.util.Map<java.lang.String,T>	beansOfTypeIncludingAncestors(ListableBeanFactory lbf, java.lang.Class<T> type) Return all beans of the given type or subtypes, also picking up beans defined in ancestor bean factories if the current bean factory is a HierarchicalBeanFactory.
static <T> java.util.Map<java.lang.String,T>	beansOfTypeIncludingAncestors(ListableBeanFactory lbf, java.lang.Class<T> type, boolean includeNonSingletons, boolean allowEagerInit) Return all beans of the given type or subtypes, also picking up beans defined in ancestor bean factories if the current bean factory is a HierarchicalBeanFactory.
static int	countBeansIncludingAncestors(ListableBeanFactory lbf) Count all beans in any hierarchy in which this factory participates.
static boolean	isFactoryDereference(java.lang.String name) Return whether the given name is a factory dereference (beginning with the factory dereference prefix).
static boolean	isGeneratedBeanName(java.lang.String name) Return whether the given name is a bean name which has been generated by the default naming strategy (containing a "#..." part).
static java.lang.String	originalBeanName(java.lang.String name) Extract the "raw" bean name from the given (potentially generated) bean name, excluding any "#..." suffixes which might have been added for uniqueness.
static java.lang.String	transformedBeanName(java.lang.String name) Return the actual bean name, stripping out the factory dereference prefix (if any, also stripping repeated factory prefixes if found).
private static <T> T	uniqueBean(java.lang.Class<T> type, java.util.Map<java.lang.String,T> matchingBeans) Extract a unique bean for the given type from the given Map of matching beans.

Methods inherited from class java.lang.Object

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

Field Detail

GENERATED_BEAN_NAME_SEPARATOR

public static final java.lang.String GENERATED_BEAN_NAME_SEPARATOR

Separator for generated bean names. If a class name or parent name is not unique, "#1", "#2" etc will be appended, until the name becomes unique.

See Also:

Constant Field Values

Constructor Detail

BeanFactoryUtils

public BeanFactoryUtils()

Method Detail

isFactoryDereference

public static boolean isFactoryDereference(java.lang.String name)

Return whether the given name is a factory dereference (beginning with the factory dereference prefix).

Parameters:

name - the name of the bean

Returns:

whether the given name is a factory dereference

See Also:

BeanFactory.FACTORY_BEAN_PREFIX

transformedBeanName

public static java.lang.String transformedBeanName(java.lang.String name)

Return the actual bean name, stripping out the factory dereference prefix (if any, also stripping repeated factory prefixes if found).

Parameters:

name - the name of the bean

Returns:

the transformed name

See Also:

BeanFactory.FACTORY_BEAN_PREFIX

isGeneratedBeanName

public static boolean isGeneratedBeanName(java.lang.String name)

Return whether the given name is a bean name which has been generated by the default naming strategy (containing a "#..." part).

Parameters:

name - the name of the bean

Returns:

whether the given name is a generated bean name

See Also:

GENERATED_BEAN_NAME_SEPARATOR, BeanDefinitionReaderUtils.generateBeanName(org.springframework.beans.factory.config.BeanDefinition, org.springframework.beans.factory.support.BeanDefinitionRegistry, boolean), DefaultBeanNameGenerator

originalBeanName

public static java.lang.String originalBeanName(java.lang.String name)

Extract the "raw" bean name from the given (potentially generated) bean name, excluding any "#..." suffixes which might have been added for uniqueness.

Parameters:

name - the potentially generated bean name

Returns:

the raw bean name

See Also:

GENERATED_BEAN_NAME_SEPARATOR

countBeansIncludingAncestors

public static int countBeansIncludingAncestors(ListableBeanFactory lbf)

Count all beans in any hierarchy in which this factory participates. Includes counts of ancestor bean factories.

Beans that are "overridden" (specified in a descendant factory with the same name) are only counted once.

Parameters:

lbf - the bean factory

Returns:

count of beans including those defined in ancestor factories

beanNamesIncludingAncestors

public static java.lang.String[] beanNamesIncludingAncestors(ListableBeanFactory lbf)

Return all bean names in the factory, including ancestor factories.

Parameters:

lbf - the bean factory

Returns:

the array of matching bean names, or an empty array if none

See Also:

beanNamesForTypeIncludingAncestors(org.springframework.beans.factory.ListableBeanFactory, org.springframework.core.ResolvableType)

beanNamesForTypeIncludingAncestors

public static java.lang.String[] beanNamesForTypeIncludingAncestors(ListableBeanFactory lbf,
                                                                    ResolvableType type)

Get all bean names for the given type, including those defined in ancestor factories. Will return unique names in case of overridden bean definitions.

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.

This version of beanNamesForTypeIncludingAncestors automatically includes prototypes and FactoryBeans.

Parameters:

lbf - the bean factory

type - the type that beans must match (as a ResolvableType)

Returns:

the array of matching bean names, or an empty array if none

Since:

4.2

beanNamesForTypeIncludingAncestors

public static java.lang.String[] beanNamesForTypeIncludingAncestors(ListableBeanFactory lbf,
                                                                    java.lang.Class<?> type)

Get all bean names for the given type, including those defined in ancestor factories. Will return unique names in case of overridden bean definitions.

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.

This version of beanNamesForTypeIncludingAncestors automatically includes prototypes and FactoryBeans.

Parameters:

lbf - the bean factory

type - the type that beans must match (as a Class)

Returns:

the array of matching bean names, or an empty array if none

beanNamesForTypeIncludingAncestors

public static java.lang.String[] beanNamesForTypeIncludingAncestors(ListableBeanFactory lbf,
                                                                    java.lang.Class<?> type,
                                                                    boolean includeNonSingletons,
                                                                    boolean allowEagerInit)

Get all bean names for the given type, including those defined in ancestor factories. Will return unique names in case of overridden bean definitions.

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).

Parameters:

lbf - the bean factory

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.

type - the type that beans must match

Returns:

the array of matching bean names, or an empty array if none

beansOfTypeIncludingAncestors

public static <T> java.util.Map<java.lang.String,T> beansOfTypeIncludingAncestors(ListableBeanFactory lbf,
                                                                                  java.lang.Class<T> type)
                                                                           throws BeansException

Return all beans of the given type or subtypes, also picking up beans defined in ancestor bean factories if the current bean factory is a HierarchicalBeanFactory. The returned Map will only contain beans of this type.

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.

Note: Beans of the same name will take precedence at the 'lowest' factory level, i.e. such beans will be returned from the lowest factory that they are being found in, hiding corresponding beans in ancestor factories. This feature allows for 'replacing' beans by explicitly choosing the same bean name in a child factory; the bean in the ancestor factory won't be visible then, not even for by-type lookups.

Parameters:

lbf - the bean factory

type - type of bean to match

Returns:

the Map of matching bean instances, or an empty Map if none

Throws:

BeansException - if a bean could not be created

beansOfTypeIncludingAncestors

public static <T> java.util.Map<java.lang.String,T> beansOfTypeIncludingAncestors(ListableBeanFactory lbf,
                                                                                  java.lang.Class<T> type,
                                                                                  boolean includeNonSingletons,
                                                                                  boolean allowEagerInit)
                                                                           throws BeansException

Return all beans of the given type or subtypes, also picking up beans defined in ancestor bean factories if the current bean factory is a HierarchicalBeanFactory. The returned Map will only contain beans of this type.

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).

Note: Beans of the same name will take precedence at the 'lowest' factory level, i.e. such beans will be returned from the lowest factory that they are being found in, hiding corresponding beans in ancestor factories. This feature allows for 'replacing' beans by explicitly choosing the same bean name in a child factory; the bean in the ancestor factory won't be visible then, not even for by-type lookups.

Parameters:

lbf - the bean factory

type - type of bean to match

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 Map of matching bean instances, or an empty Map if none

Throws:

BeansException - if a bean could not be created

beanOfTypeIncludingAncestors

public static <T> T beanOfTypeIncludingAncestors(ListableBeanFactory lbf,
                                                 java.lang.Class<T> type)
                                          throws BeansException

Return a single bean of the given type or subtypes, also picking up beans defined in ancestor bean factories if the current bean factory is a HierarchicalBeanFactory. Useful convenience method when we expect a single bean and don't care about the bean name.

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.

This version of beanOfTypeIncludingAncestors automatically includes prototypes and FactoryBeans.

Note: Beans of the same name will take precedence at the 'lowest' factory level, i.e. such beans will be returned from the lowest factory that they are being found in, hiding corresponding beans in ancestor factories. This feature allows for 'replacing' beans by explicitly choosing the same bean name in a child factory; the bean in the ancestor factory won't be visible then, not even for by-type lookups.

Parameters:

lbf - the bean factory

type - type of bean to match

Returns:

the matching bean instance

Throws:

NoSuchBeanDefinitionException - if no bean of the given type was found

NoUniqueBeanDefinitionException - if more than one bean of the given type was found

BeansException - if the bean could not be created

beanOfTypeIncludingAncestors

public static <T> T beanOfTypeIncludingAncestors(ListableBeanFactory lbf,
                                                 java.lang.Class<T> type,
                                                 boolean includeNonSingletons,
                                                 boolean allowEagerInit)
                                          throws BeansException

Return a single bean of the given type or subtypes, also picking up beans defined in ancestor bean factories if the current bean factory is a HierarchicalBeanFactory. Useful convenience method when we expect a single bean and don't care about the bean name.

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).

Note: Beans of the same name will take precedence at the 'lowest' factory level, i.e. such beans will be returned from the lowest factory that they are being found in, hiding corresponding beans in ancestor factories. This feature allows for 'replacing' beans by explicitly choosing the same bean name in a child factory; the bean in the ancestor factory won't be visible then, not even for by-type lookups.

Parameters:

lbf - the bean factory

type - type of bean to match

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 matching bean instance

Throws:

NoSuchBeanDefinitionException - if no bean of the given type was found

NoUniqueBeanDefinitionException - if more than one bean of the given type was found

BeansException - if the bean could not be created

beanOfType

public static <T> T beanOfType(ListableBeanFactory lbf,
                               java.lang.Class<T> type)
                        throws BeansException

Return a single bean of the given type or subtypes, not looking in ancestor factories. Useful convenience method when we expect a single bean and don't care about the bean name.

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.

This version of beanOfType automatically includes prototypes and FactoryBeans.

Parameters:

lbf - the bean factory

type - type of bean to match

Returns:

the matching bean instance

Throws:

NoSuchBeanDefinitionException - if no bean of the given type was found

NoUniqueBeanDefinitionException - if more than one bean of the given type was found

BeansException - if the bean could not be created

beanOfType

public static <T> T beanOfType(ListableBeanFactory lbf,
                               java.lang.Class<T> type,
                               boolean includeNonSingletons,
                               boolean allowEagerInit)
                        throws BeansException

Return a single bean of the given type or subtypes, not looking in ancestor factories. Useful convenience method when we expect a single bean and don't care about the bean name.

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).

Parameters:

lbf - the bean factory

type - type of bean to match

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 matching bean instance

Throws:

NoSuchBeanDefinitionException - if no bean of the given type was found

NoUniqueBeanDefinitionException - if more than one bean of the given type was found

BeansException - if the bean could not be created

uniqueBean

private static <T> T uniqueBean(java.lang.Class<T> type,
                                java.util.Map<java.lang.String,T> matchingBeans)

Extract a unique bean for the given type from the given Map of matching beans.

Parameters:

type - type of bean to match

matchingBeans - all matching beans found

Returns:

the unique bean instance

Throws:

NoSuchBeanDefinitionException - if no bean of the given type was found

NoUniqueBeanDefinitionException - if more than one bean of the given type was found