Package org.springframework.web.context.support

Class ServletContextParameterFactoryBean

java.lang.Object
org.springframework.web.context.support.ServletContextParameterFactoryBean
All Implemented Interfaces:
Aware, FactoryBean<String>, ServletContextAware
public class ServletContextParameterFactoryBean extends Object implements FactoryBean<String>, ServletContextAware
FactoryBean that retrieves a specific ServletContext init parameter (that is, a "context-param" defined in web.xml). Exposes that ServletContext init parameter when used as bean reference, effectively making it available as named Spring bean instance.

NOTE: You may also use the "contextParameters" default bean, which is of type Map, and dereference it using a "#{contextParameters.myKey}" expression to access a specific parameter by name.

Since:
1.2.4
Author:
Juergen Hoeller
See Also:

  • Constructor Details

    • ServletContextParameterFactoryBean

      public ServletContextParameterFactoryBean()

  • Method Details

    • setInitParamName

      public void setInitParamName(String initParamName)
      Set the name of the ServletContext init parameter to expose.

    • setServletContext

      public void setServletContext(ServletContext servletContext)
      Description copied from interface: ServletContextAware
      Set the ServletContext that this object runs in.

      Invoked after population of normal bean properties but before an init callback like InitializingBean's afterPropertiesSet or a custom init-method. Invoked after ApplicationContextAware's setApplicationContext.

      Specified by:
      setServletContext in interface ServletContextAware
      Parameters:
      servletContext - the ServletContext object to be used by this object
      See Also:

    • getObject

      @Nullable public String getObject()
      Description copied from interface: FactoryBean
      Return an instance (possibly shared or independent) of the object managed by this factory.

      As with a BeanFactory, this allows support for both the Singleton and Prototype design patterns.

      If this FactoryBean is not fully initialized yet at the time of the call (for example because it is involved in a circular reference), throw a corresponding FactoryBeanNotInitializedException.

      FactoryBeans are allowed to return null objects. The bean factory will consider this as a normal value to be used and will not throw a FactoryBeanNotInitializedException in this case. However, FactoryBean implementations are encouraged to throw FactoryBeanNotInitializedException themselves, as appropriate.

      Specified by:
      getObject in interface FactoryBean<String>
      Returns:
      an instance of the bean (can be null)
      See Also:

    • getObjectType

      public Class<String> getObjectType()
      Description copied from interface: FactoryBean
      Return the type of object that this FactoryBean creates, or null if not known in advance.

      This allows one to check for specific types of beans without instantiating objects, for example on autowiring.

      In the case of implementations that create a singleton object, this method should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.

      This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.

      NOTE: Autowiring will simply ignore FactoryBeans that return null here. Therefore, it is highly recommended to implement this method properly, using the current state of the FactoryBean.

      Specified by:
      getObjectType in interface FactoryBean<String>
      Returns:
      the type of object that this FactoryBean creates, or null if not known at the time of the call
      See Also:

    • isSingleton

      public boolean isSingleton()
      Description copied from interface: FactoryBean
      Is the object managed by this factory a singleton? That is, will FactoryBean.getObject() always return the same object (a reference that can be cached)?

      NOTE: If a FactoryBean indicates that it holds a singleton object, the object returned from getObject() might get cached by the owning BeanFactory. Hence, do not return true unless the FactoryBean always exposes the same reference.

      The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.

      NOTE: This method returning false does not necessarily indicate that returned objects are independent instances. An implementation of the extended SmartFactoryBean interface may explicitly indicate independent instances through its SmartFactoryBean.isPrototype() method. Plain FactoryBean implementations which do not implement this extended interface are simply assumed to always return independent instances if the isSingleton() implementation returns false.

      The default implementation returns true, since a FactoryBean typically manages a singleton instance.

      Specified by:
      isSingleton in interface FactoryBean<String>
      Returns:
      whether the exposed object is a singleton
      See Also: