org.springframework.beans.factory.config

## Interface BeanDefinition

- All Superinterfaces:
    AttributeAccessor, BeanMetadataElement
  All Known Subinterfaces:
    AnnotatedBeanDefinition
  All Known Implementing Classes:
    AbstractBeanDefinition, AnnotatedGenericBeanDefinition, ChildBeanDefinition, GenericBeanDefinition, RootBeanDefinition, ScannedGenericBeanDefinition

      public interface BeanDefinition
      extends AttributeAccessor, BeanMetadataElement

  A BeanDefinition describes a bean instance, which has property values, constructor argument values, and further information supplied by concrete implementations.

  This is just a minimal interface: The main intention is to allow a `BeanFactoryPostProcessor` such as `PropertyPlaceholderConfigurer` to introspect and modify property values and other bean metadata.

  Since:
    19.03.2004
  Author:
    Juergen Hoeller, Rob Harrop
  See Also:
    `ConfigurableListableBeanFactory.getBeanDefinition(java.lang.String)`, `RootBeanDefinition`, `ChildBeanDefinition`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `ROLE_APPLICATION` Role hint indicating that a `BeanDefinition` is a major part of the application.
    `static int` | `ROLE_INFRASTRUCTURE` Role hint indicating that a `BeanDefinition` is providing an entirely background role and has no relevance to the end-user.
    `static int` | `ROLE_SUPPORT` Role hint indicating that a `BeanDefinition` is a supporting part of some larger configuration, typically an outer `ComponentDefinition`.
    `static String` | `SCOPE_PROTOTYPE` Scope identifier for the standard prototype scope: "prototype".
    `static String` | `SCOPE_SINGLETON` Scope identifier for the standard singleton scope: "singleton".

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `String` | `getBeanClassName()` Return the current bean class name of this bean definition.
    `ConstructorArgumentValues` | `getConstructorArgumentValues()` Return the constructor argument values for this bean.
    `String[]` | `getDependsOn()` Return the bean names that this bean depends on.
    `String` | `getDescription()` Return a human-readable description of this bean definition.
    `String` | `getFactoryBeanName()` Return the factory bean name, if any.
    `String` | `getFactoryMethodName()` Return a factory method, if any.
    `BeanDefinition` | `getOriginatingBeanDefinition()` Return the originating BeanDefinition, or `null` if none.
    `String` | `getParentName()` Return the name of the parent definition of this bean definition, if any.
    `MutablePropertyValues` | `getPropertyValues()` Return the property values to be applied to a new instance of the bean.
    `String` | `getResourceDescription()` Return a description of the resource that this bean definition came from (for the purpose of showing context in case of errors).
    `int` | `getRole()` Get the role hint for this `BeanDefinition`.
    `String` | `getScope()` Return the name of the current target scope for this bean, or `null` if not known yet.
    `boolean` | `isAbstract()` Return whether this bean is "abstract", that is, not meant to be instantiated.
    `boolean` | `isAutowireCandidate()` Return whether this bean is a candidate for getting autowired into some other bean.
    `boolean` | `isLazyInit()` Return whether this bean should be lazily initialized, i.e.
    `boolean` | `isPrimary()` Return whether this bean is a primary autowire candidate.
    `boolean` | `isPrototype()` Return whether this a Prototype, with an independent instance returned for each call.
    `boolean` | `isSingleton()` Return whether this a Singleton, with a single, shared instance returned on all calls.
    `void` | `setAutowireCandidate(boolean autowireCandidate)` Set whether this bean is a candidate for getting autowired into some other bean.
    `void` | `setBeanClassName(String beanClassName)` Override the bean class name of this bean definition.
    `void` | `setDependsOn(String[] dependsOn)` Set the names of the beans that this bean depends on being initialized.
    `void` | `setFactoryBeanName(String factoryBeanName)` Specify the factory bean to use, if any.
    `void` | `setFactoryMethodName(String factoryMethodName)` Specify a factory method, if any.
    `void` | `setLazyInit(boolean lazyInit)` Set whether this bean should be lazily initialized.
    `void` | `setParentName(String parentName)` Set the name of the parent definition of this bean definition, if any.
    `void` | `setPrimary(boolean primary)` Set whether this bean is a primary autowire candidate.
    `void` | `setScope(String scope)` Override the target scope of this bean, specifying a new scope name.

    - ### Methods inherited from interface org.springframework.core.AttributeAccessor

      `attributeNames, getAttribute, hasAttribute, removeAttribute, setAttribute`

    - ### Methods inherited from interface org.springframework.beans.BeanMetadataElement

      `getSource`

- - ### Field Detail

    - #### SCOPE_SINGLETON

          static final String SCOPE_SINGLETON

      Scope identifier for the standard singleton scope: "singleton".

      Note that extended bean factories might support further scopes.

      See Also:
        `setScope(java.lang.String)`, Constant Field Values

    - #### SCOPE_PROTOTYPE

          static final String SCOPE_PROTOTYPE

      Scope identifier for the standard prototype scope: "prototype".

      Note that extended bean factories might support further scopes.

      See Also:
        `setScope(java.lang.String)`, Constant Field Values

    - #### ROLE_APPLICATION

          static final int ROLE_APPLICATION

      Role hint indicating that a `BeanDefinition` is a major part of the application. Typically corresponds to a user-defined bean.
      See Also:
        Constant Field Values

    - #### ROLE_SUPPORT

          static final int ROLE_SUPPORT

      Role hint indicating that a `BeanDefinition` is a supporting part of some larger configuration, typically an outer `ComponentDefinition`. `SUPPORT` beans are considered important enough to be aware of when looking more closely at a particular `ComponentDefinition`, but not when looking at the overall configuration of an application.
      See Also:
        Constant Field Values

    - #### ROLE_INFRASTRUCTURE

          static final int ROLE_INFRASTRUCTURE

      Role hint indicating that a `BeanDefinition` is providing an entirely background role and has no relevance to the end-user. This hint is used when registering beans that are completely part of the internal workings of a `ComponentDefinition`.
      See Also:
        Constant Field Values

  - ### Method Detail

    - #### getParentName

          String getParentName()

      Return the name of the parent definition of this bean definition, if any.

    - #### setParentName

          void setParentName(String parentName)

      Set the name of the parent definition of this bean definition, if any.

    - #### getBeanClassName

          String getBeanClassName()

      Return the current bean class name of this bean definition.

      Note that this does not have to be the actual class name used at runtime, in case of a child definition overriding/inheriting the class name from its parent. Hence, do not consider this to be the definitive bean type at runtime but rather only use it for parsing purposes at the individual bean definition level.

    - #### setBeanClassName

          void setBeanClassName(String beanClassName)

      Override the bean class name of this bean definition.

      The class name can be modified during bean factory post-processing, typically replacing the original class name with a parsed variant of it.

    - #### getFactoryBeanName

          String getFactoryBeanName()

      Return the factory bean name, if any.

    - #### setFactoryBeanName

          void setFactoryBeanName(String factoryBeanName)

      Specify the factory bean to use, if any.

    - #### getFactoryMethodName

          String getFactoryMethodName()

      Return a factory method, if any.

    - #### setFactoryMethodName

          void setFactoryMethodName(String factoryMethodName)

      Specify a factory method, if any. This method will be invoked with constructor arguments, or with no arguments if none are specified. The method will be invoked on the specified factory bean, if any, or otherwise as a static method on the local bean class.
      Parameters:
        `factoryMethodName` - static factory method name, or `null` if normal constructor creation should be used
      See Also:
        `getBeanClassName()`

    - #### getScope

          String getScope()

      Return the name of the current target scope for this bean, or `null` if not known yet.

    - #### setScope

          void setScope(String scope)

      Override the target scope of this bean, specifying a new scope name.
      See Also:
        `SCOPE_SINGLETON`, `SCOPE_PROTOTYPE`

    - #### isLazyInit

          boolean isLazyInit()

      Return whether this bean should be lazily initialized, i.e. not eagerly instantiated on startup. Only applicable to a singleton bean.

    - #### setLazyInit

          void setLazyInit(boolean lazyInit)

      Set whether this bean should be lazily initialized.

      If `false`, the bean will get instantiated on startup by bean factories that perform eager initialization of singletons.

    - #### getDependsOn

          String[] getDependsOn()

      Return the bean names that this bean depends on.

    - #### setDependsOn

          void setDependsOn(String[] dependsOn)

      Set the names of the beans that this bean depends on being initialized. The bean factory will guarantee that these beans get initialized first.

    - #### isAutowireCandidate

          boolean isAutowireCandidate()

      Return whether this bean is a candidate for getting autowired into some other bean.

    - #### setAutowireCandidate

          void setAutowireCandidate(boolean autowireCandidate)

      Set whether this bean is a candidate for getting autowired into some other bean.

    - #### isPrimary

          boolean isPrimary()

      Return whether this bean is a primary autowire candidate. If this value is true for exactly one bean among multiple matching candidates, it will serve as a tie-breaker.

    - #### setPrimary

          void setPrimary(boolean primary)

      Set whether this bean is a primary autowire candidate.

      If this value is true for exactly one bean among multiple matching candidates, it will serve as a tie-breaker.

    - #### getConstructorArgumentValues

          ConstructorArgumentValues getConstructorArgumentValues()

      Return the constructor argument values for this bean.

      The returned instance can be modified during bean factory post-processing.

      Returns:
        the ConstructorArgumentValues object (never `null`)

    - #### getPropertyValues

          MutablePropertyValues getPropertyValues()

      Return the property values to be applied to a new instance of the bean.

      The returned instance can be modified during bean factory post-processing.

      Returns:
        the MutablePropertyValues object (never `null`)

    - #### isSingleton

          boolean isSingleton()

      Return whether this a Singleton, with a single, shared instance returned on all calls.
      See Also:
        `SCOPE_SINGLETON`

    - #### isPrototype

          boolean isPrototype()

      Return whether this a Prototype, with an independent instance returned for each call.
      See Also:
        `SCOPE_PROTOTYPE`

    - #### isAbstract

          boolean isAbstract()

      Return whether this bean is "abstract", that is, not meant to be instantiated.

    - #### getRole

          int getRole()

      Get the role hint for this `BeanDefinition`. The role hint provides tools with an indication of the importance of a particular `BeanDefinition`.
      See Also:
        `ROLE_APPLICATION`, `ROLE_INFRASTRUCTURE`, `ROLE_SUPPORT`

    - #### getDescription

          String getDescription()

      Return a human-readable description of this bean definition.

    - #### getResourceDescription

          String getResourceDescription()

      Return a description of the resource that this bean definition came from (for the purpose of showing context in case of errors).

    - #### getOriginatingBeanDefinition

          BeanDefinition getOriginatingBeanDefinition()

      Return the originating BeanDefinition, or `null` if none. Allows for retrieving the decorated bean definition, if any.

      Note that this method returns the immediate originator. Iterate through the originator chain to find the original BeanDefinition as defined by the user.