org.apache.struts2.config
Class BeanSelectionProvider

java.lang.Object
  org.apache.struts2.config.BeanSelectionProvider

All Implemented Interfaces:

ConfigurationProvider, ContainerProvider, PackageProvider

public class BeanSelectionProvider
extends Object
implements ConfigurationProvider

Selects the implementations of key framework extension points, using the loaded property constants. The implementations are selected from the container builder using the name defined in its associated property. The default implementation name will always be "struts".

The following is a list of the allowed extension points:

Type	Property	Scope	Description
com.opensymphony.xwork2.ObjectFactory	struts.objectFactory	singleton	Creates actions, results, and interceptors
com.opensymphony.xwork2.ActionProxyFactory	struts.actionProxyFactory	singleton	Creates the ActionProxy
com.opensymphony.xwork2.util.ObjectTypeDeterminer	struts.objectTypeDeterminer	singleton	Determines what the key and element class of a Map or Collection should be
org.apache.struts2.dispatcher.mapper.ActionMapper	struts.mapper.class	singleton	Determines the ActionMapping from a request and a URI from an ActionMapping
org.apache.struts2.dispatcher.multipart.MultiPartRequest	struts.multipart.parser	per request	Parses a multipart request (file upload)
org.apache.struts2.views.freemarker.FreemarkerManager	struts.freemarker.manager.classname	singleton	Loads and processes Freemarker templates
org.apache.struts2.views.velocity.VelocityManager	struts.velocity.manager.classname	singleton	Loads and processes Velocity templates
com.opensymphony.xwork2.validator.ActionValidatorManager	struts.actionValidatorManager	singleton	Main interface for validation managers (regular and annotation based). Handles both the loading of configuration and the actual validation (since 2.1)
com.opensymphony.xwork2.util.ValueStackFactory	struts.valueStackFactory	singleton	Creates value stacks (since 2.1)
com.opensymphony.xwork2.reflection.ReflectionProvider	struts.reflectionProvider	singleton	Provides reflection services, key place to plug in a custom expression language (since 2.1)
com.opensymphony.xwork2.reflection.ReflectionContextFactory	struts.reflectionContextFactory	singleton	Creates reflection context maps used for reflection and expression language operations (since 2.1)
com.opensymphony.xwork2.config.PackageProvider	N/A	singleton	All beans registered as PackageProvider implementations will be automatically included in configuration building (since 2.1)
com.opensymphony.xwork2.util.PatternMatcher	struts.patternMatcher	singleton	Matches patterns, such as action names, generally used in configuration (since 2.1)

Implementations are selected using the value of its associated property. That property is used to determine the implementation by:

1. Trying to find an existing bean by that name in the container
2. Trying to find a class by that name, then creating a new bean factory for it
3. Creating a new delegation bean factory that delegates to the configured ObjectFactory at runtime

Finally, this class overrides certain properties if dev mode is enabled:

• struts.i18n.reload = true
• struts.configuration.xml.reload = true

Nested Class Summary

(package private) static class

BeanSelectionProvider.ObjectFactoryDelegateFactory

Field Summary

static String	DEFAULT_BEAN_NAME
private static Logger	LOG

Constructor Summary

BeanSelectionProvider()

Method Summary

(package private) void	alias(Class type, String key, ContainerBuilder builder, Properties props)
(package private) void	alias(Class type, String key, ContainerBuilder builder, Properties props, Scope scope)
void	destroy() Called before removed from the configuration manager
void	init(Configuration configuration) Initializes with the configuration
void	loadPackages() Loads the packages for the configuration.
boolean	needsReload() Tells whether the ContainerProvider should reload its configuration
void	register(ContainerBuilder builder, LocatableProperties props) Registers beans and properties for the Container

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_BEAN_NAME

public static final String DEFAULT_BEAN_NAME

See Also:

Constant Field Values

LOG

private static final Logger LOG

Constructor Detail

BeanSelectionProvider

public BeanSelectionProvider()

Method Detail

destroy

public void destroy()

Description copied from interface: ContainerProvider

Called before removed from the configuration manager

Specified by:

destroy in interface ContainerProvider

loadPackages

public void loadPackages()
                  throws ConfigurationException

Description copied from interface: PackageProvider

Loads the packages for the configuration.

Specified by:

loadPackages in interface PackageProvider

Throws:

ConfigurationException

init

public void init(Configuration configuration)
          throws ConfigurationException

Description copied from interface: ContainerProvider

Initializes with the configuration

Specified by:

init in interface ContainerProvider

Specified by:

init in interface PackageProvider

Parameters:

configuration - The configuration

Throws:

ConfigurationException - If anything goes wrong

needsReload

public boolean needsReload()

Description copied from interface: ContainerProvider

Tells whether the ContainerProvider should reload its configuration

Specified by:

needsReload in interface ContainerProvider

Specified by:

needsReload in interface PackageProvider

Returns:

true, whether the ContainerProvider should reload its configuration, falseotherwise.

register

public void register(ContainerBuilder builder,
                     LocatableProperties props)

Description copied from interface: ContainerProvider

Registers beans and properties for the Container

Specified by:

register in interface ContainerProvider

Parameters:

builder - The builder to register beans with

props - The properties to register constants with

alias

void alias(Class type,
           String key,
           ContainerBuilder builder,
           Properties props)

alias

void alias(Class type,
           String key,
           ContainerBuilder builder,
           Properties props,
           Scope scope)