org.springframework.context.support
Class GenericApplicationContext

java.lang.Object
  org.springframework.core.io.DefaultResourceLoader
      org.springframework.context.support.AbstractApplicationContext
          org.springframework.context.support.GenericApplicationContext

All Implemented Interfaces:

BeanFactory, DisposableBean, HierarchicalBeanFactory, ListableBeanFactory, BeanDefinitionRegistry, ApplicationContext, ApplicationEventPublisher, ConfigurableApplicationContext, Lifecycle, MessageSource, AliasRegistry, ResourceLoader, ResourcePatternResolver

Direct Known Subclasses:

AnnotationConfigApplicationContext, GenericWebApplicationContext, GenericXmlApplicationContext, ResourceAdapterApplicationContext, StaticApplicationContext

public class GenericApplicationContext
extends AbstractApplicationContext
implements BeanDefinitionRegistry

Generic ApplicationContext implementation that holds a single internal DefaultListableBeanFactory instance and does not assume a specific bean definition format. Implements the BeanDefinitionRegistry interface in order to allow for applying any bean definition readers to it.

Typical usage is to register a variety of bean definitions via the BeanDefinitionRegistry interface and then call AbstractApplicationContext.refresh() to initialize those beans with application context semantics (handling ApplicationContextAware, auto-detecting BeanFactoryPostProcessors, etc).

In contrast to other ApplicationContext implementations that create a new internal BeanFactory instance for each refresh, the internal BeanFactory of this context is available right from the start, to be able to register bean definitions on it. AbstractApplicationContext.refresh() may only be called once.

Usage example:

 GenericApplicationContext ctx = new GenericApplicationContext();
 XmlBeanDefinitionReader xmlReader = new XmlBeanDefinitionReader(ctx);
 xmlReader.loadBeanDefinitions(new ClassPathResource("applicationContext.xml"));
 PropertiesBeanDefinitionReader propReader = new PropertiesBeanDefinitionReader(ctx);
 propReader.loadBeanDefinitions(new ClassPathResource("otherBeans.properties"));
 ctx.refresh();

 MyBean myBean = (MyBean) ctx.getBean("myBean");
 ...

For the typical case of XML bean definitions, simply use ClassPathXmlApplicationContext or FileSystemXmlApplicationContext, which are easier to set up - but less flexible, since you can just use standard resource locations for XML bean definitions, rather than mixing arbitrary bean definition formats. The equivalent in a web environment is XmlWebApplicationContext.

For custom application context implementations that are supposed to read special bean definition formats in a refreshable manner, consider deriving from the AbstractRefreshableApplicationContext base class.

Since:

1.1.2

Author:

Juergen Hoeller

See Also:

registerBeanDefinition(java.lang.String, org.springframework.beans.factory.config.BeanDefinition), AbstractApplicationContext.refresh(), XmlBeanDefinitionReader, PropertiesBeanDefinitionReader

Field Summary

Fields inherited from class org.springframework.context.support.AbstractApplicationContext

APPLICATION_EVENT_MULTICASTER_BEAN_NAME, LIFECYCLE_PROCESSOR_BEAN_NAME, logger, MESSAGE_SOURCE_BEAN_NAME

Fields inherited from interface org.springframework.context.ConfigurableApplicationContext

CONFIG_LOCATION_DELIMITERS, CONVERSION_SERVICE_BEAN_NAME, LOAD_TIME_WEAVER_BEAN_NAME, SYSTEM_ENVIRONMENT_BEAN_NAME, SYSTEM_PROPERTIES_BEAN_NAME

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

FACTORY_BEAN_PREFIX

Fields inherited from interface org.springframework.core.io.support.ResourcePatternResolver

CLASSPATH_ALL_URL_PREFIX

Fields inherited from interface org.springframework.core.io.ResourceLoader

CLASSPATH_URL_PREFIX

Constructor Summary

GenericApplicationContext()
Create a new GenericApplicationContext.

GenericApplicationContext(ApplicationContext parent)
Create a new GenericApplicationContext with the given parent.

GenericApplicationContext(DefaultListableBeanFactory beanFactory)
Create a new GenericApplicationContext with the given DefaultListableBeanFactory.

GenericApplicationContext(DefaultListableBeanFactory beanFactory, ApplicationContext parent)
Create a new GenericApplicationContext with the given DefaultListableBeanFactory.

Method Summary

protected void	closeBeanFactory() Not much to do: We hold a single internal BeanFactory that will never get released.
BeanDefinition	getBeanDefinition(String beanName) Return the BeanDefinition for the given bean name.
ConfigurableListableBeanFactory	getBeanFactory() Return the single internal BeanFactory held by this context (as ConfigurableListableBeanFactory).
DefaultListableBeanFactory	getDefaultListableBeanFactory() Return the underlying bean factory of this context, available for registering bean definitions.
Resource	getResource(String location) This implementation delegates to this context's ResourceLoader if set, falling back to the default superclass behavior else.
Resource[]	getResources(String locationPattern) This implementation delegates to this context's ResourceLoader if it implements the ResourcePatternResolver interface, falling back to the default superclass behavior else.
boolean	isAlias(String beanName) Determine whether this given name is defines as an alias (as opposed to the name of an actually registered component).
boolean	isBeanNameInUse(String beanName) Determine whether the given bean name is already in use within this registry, i.e.
protected void	refreshBeanFactory() Do nothing: We hold a single internal BeanFactory and rely on callers to register beans through our public methods (or the BeanFactory's).
void	registerAlias(String beanName, String alias) Given a name, register an alias for it.
void	registerBeanDefinition(String beanName, BeanDefinition beanDefinition) Register a new bean definition with this registry.
void	removeAlias(String alias) Remove the specified alias from this registry.
void	removeBeanDefinition(String beanName) Remove the BeanDefinition for the given name.
void	setAllowBeanDefinitionOverriding(boolean allowBeanDefinitionOverriding) Set whether it should be allowed to override bean definitions by registering a different definition with the same name, automatically replacing the former.
void	setAllowCircularReferences(boolean allowCircularReferences) Set whether to allow circular references between beans - and automatically try to resolve them.
void	setId(String id) Set the unique id of this application context.
void	setParent(ApplicationContext parent) Set the parent of this application context, also setting the parent of the internal BeanFactory accordingly.
void	setResourceLoader(ResourceLoader resourceLoader) Set a ResourceLoader to use for this context.

Methods inherited from class org.springframework.context.support.AbstractApplicationContext

addApplicationListener, addBeanFactoryPostProcessor, addListener, cancelRefresh, close, containsBean, containsBeanDefinition, containsLocalBean, destroy, destroyBeans, doClose, findAnnotationOnBean, finishBeanFactoryInitialization, finishRefresh, getAliases, getApplicationListeners, getAutowireCapableBeanFactory, getBean, getBean, getBean, getBean, getBeanDefinitionCount, getBeanDefinitionNames, getBeanFactoryPostProcessors, getBeanNamesForType, getBeanNamesForType, getBeansOfType, getBeansOfType, getBeansWithAnnotation, getDisplayName, getId, getInternalParentBeanFactory, getInternalParentMessageSource, getMessage, getMessage, getMessage, getParent, getParentBeanFactory, getResourcePatternResolver, getStartupDate, getType, initApplicationEventMulticaster, initLifecycleProcessor, initMessageSource, invokeBeanFactoryPostProcessors, isActive, isPrototype, isRunning, isSingleton, isTypeMatch, obtainFreshBeanFactory, onClose, onRefresh, postProcessBeanFactory, prepareBeanFactory, prepareRefresh, publishEvent, refresh, registerBeanPostProcessors, registerListeners, registerShutdownHook, setDisplayName, start, stop, toString

Methods inherited from class org.springframework.core.io.DefaultResourceLoader

getClassLoader, getResourceByPath, setClassLoader

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.beans.factory.support.BeanDefinitionRegistry

containsBeanDefinition, getBeanDefinitionCount, getBeanDefinitionNames

Methods inherited from interface org.springframework.core.AliasRegistry

getAliases

Methods inherited from interface org.springframework.core.io.ResourceLoader

getClassLoader

Constructor Detail

GenericApplicationContext

public GenericApplicationContext()

Create a new GenericApplicationContext.

See Also:

registerBeanDefinition(java.lang.String, org.springframework.beans.factory.config.BeanDefinition), AbstractApplicationContext.refresh()

GenericApplicationContext

public GenericApplicationContext(DefaultListableBeanFactory beanFactory)

Create a new GenericApplicationContext with the given DefaultListableBeanFactory.

Parameters:

beanFactory - the DefaultListableBeanFactory instance to use for this context

See Also:

registerBeanDefinition(java.lang.String, org.springframework.beans.factory.config.BeanDefinition), AbstractApplicationContext.refresh()

GenericApplicationContext

public GenericApplicationContext(ApplicationContext parent)

Create a new GenericApplicationContext with the given parent.

Parameters:

parent - the parent application context

See Also:

registerBeanDefinition(java.lang.String, org.springframework.beans.factory.config.BeanDefinition), AbstractApplicationContext.refresh()

GenericApplicationContext

public GenericApplicationContext(DefaultListableBeanFactory beanFactory,
                                 ApplicationContext parent)

Create a new GenericApplicationContext with the given DefaultListableBeanFactory.

Parameters:

beanFactory - the DefaultListableBeanFactory instance to use for this context

parent - the parent application context

See Also:

registerBeanDefinition(java.lang.String, org.springframework.beans.factory.config.BeanDefinition), AbstractApplicationContext.refresh()

Method Detail

setParent

public void setParent(ApplicationContext parent)

Set the parent of this application context, also setting the parent of the internal BeanFactory accordingly.

Specified by:

setParent in interface ConfigurableApplicationContext

Overrides:

setParent in class AbstractApplicationContext

Parameters:

parent - the parent context

See Also:

ConfigurableBeanFactory.setParentBeanFactory(org.springframework.beans.factory.BeanFactory)

setId

public void setId(String id)

Description copied from class: AbstractApplicationContext

Set the unique id of this application context.

Default is the object id of the context instance, or the name of the context bean if the context is itself defined as a bean.

Specified by:

setId in interface ConfigurableApplicationContext

Overrides:

setId in class AbstractApplicationContext

Parameters:

id - the unique id of the context

setAllowBeanDefinitionOverriding

public void setAllowBeanDefinitionOverriding(boolean allowBeanDefinitionOverriding)

Set whether it should be allowed to override bean definitions by registering a different definition with the same name, automatically replacing the former. If not, an exception will be thrown. Default is "true".

See Also:

DefaultListableBeanFactory.setAllowBeanDefinitionOverriding(boolean)

setAllowCircularReferences

public void setAllowCircularReferences(boolean allowCircularReferences)

Set whether to allow circular references between beans - and automatically try to resolve them.

Default is "true". Turn this off to throw an exception when encountering a circular reference, disallowing them completely.

See Also:

AbstractAutowireCapableBeanFactory.setAllowCircularReferences(boolean)

setResourceLoader

public void setResourceLoader(ResourceLoader resourceLoader)

Set a ResourceLoader to use for this context. If set, the context will delegate all getResource calls to the given ResourceLoader. If not set, default resource loading will apply.

The main reason to specify a custom ResourceLoader is to resolve resource paths (withour URL prefix) in a specific fashion. The default behavior is to resolve such paths as class path locations. To resolve resource paths as file system locations, specify a FileSystemResourceLoader here.

You can also pass in a full ResourcePatternResolver, which will be autodetected by the context and used for getResources calls as well. Else, default resource pattern matching will apply.

See Also:

getResource(java.lang.String), DefaultResourceLoader, FileSystemResourceLoader, ResourcePatternResolver, getResources(java.lang.String)

getResource

public Resource getResource(String location)

This implementation delegates to this context's ResourceLoader if set, falling back to the default superclass behavior else.

Specified by:

getResource in interface ResourceLoader

Overrides:

getResource in class DefaultResourceLoader

Parameters:

location - the resource location

Returns:

a corresponding Resource handle

See Also:

setResourceLoader(org.springframework.core.io.ResourceLoader)

getResources

public Resource[] getResources(String locationPattern)
                        throws IOException

This implementation delegates to this context's ResourceLoader if it implements the ResourcePatternResolver interface, falling back to the default superclass behavior else.

Specified by:

getResources in interface ResourcePatternResolver

Overrides:

getResources in class AbstractApplicationContext

Parameters:

locationPattern - the location pattern to resolve

Returns:

the corresponding Resource objects

Throws:

IOException - in case of I/O errors

See Also:

setResourceLoader(org.springframework.core.io.ResourceLoader)

refreshBeanFactory

protected final void refreshBeanFactory()
                                 throws IllegalStateException

Do nothing: We hold a single internal BeanFactory and rely on callers to register beans through our public methods (or the BeanFactory's).

Specified by:

refreshBeanFactory in class AbstractApplicationContext

Throws:

IllegalStateException - if already initialized and multiple refresh attempts are not supported

See Also:

registerBeanDefinition(java.lang.String, org.springframework.beans.factory.config.BeanDefinition)

closeBeanFactory

protected final void closeBeanFactory()

Not much to do: We hold a single internal BeanFactory that will never get released.

Specified by:

closeBeanFactory in class AbstractApplicationContext

getBeanFactory

public final ConfigurableListableBeanFactory getBeanFactory()

Return the single internal BeanFactory held by this context (as ConfigurableListableBeanFactory).

Specified by:

getBeanFactory in interface ConfigurableApplicationContext

Specified by:

getBeanFactory in class AbstractApplicationContext

Returns:

this application context's internal bean factory (never null)

See Also:

AbstractApplicationContext.refreshBeanFactory(), AbstractApplicationContext.closeBeanFactory()

getDefaultListableBeanFactory

public final DefaultListableBeanFactory getDefaultListableBeanFactory()

Return the underlying bean factory of this context, available for registering bean definitions.

NOTE: You need to call AbstractApplicationContext.refresh() to initialize the bean factory and its contained beans with application context semantics (autodetecting BeanFactoryPostProcessors, etc).

Returns:

the internal bean factory (as DefaultListableBeanFactory)

registerBeanDefinition

public void registerBeanDefinition(String beanName,
                                   BeanDefinition beanDefinition)
                            throws BeanDefinitionStoreException

Description copied from interface: BeanDefinitionRegistry

Register a new bean definition with this registry. Must support RootBeanDefinition and ChildBeanDefinition.

Specified by:

registerBeanDefinition in interface BeanDefinitionRegistry

Parameters:

beanName - the name of the bean instance to register

beanDefinition - definition of the bean instance to register

Throws:

BeanDefinitionStoreException - if the BeanDefinition is invalid or if there is already a BeanDefinition for the specified bean name (and we are not allowed to override it)

See Also:

RootBeanDefinition, ChildBeanDefinition

removeBeanDefinition

public void removeBeanDefinition(String beanName)
                          throws NoSuchBeanDefinitionException

Description copied from interface: BeanDefinitionRegistry

Remove the BeanDefinition for the given name.

Specified by:

removeBeanDefinition in interface BeanDefinitionRegistry

Parameters:

beanName - the name of the bean instance to register

Throws:

NoSuchBeanDefinitionException - if there is no such bean definition

getBeanDefinition

public BeanDefinition getBeanDefinition(String beanName)
                                 throws NoSuchBeanDefinitionException

Description copied from interface: BeanDefinitionRegistry

Return the BeanDefinition for the given bean name.

Specified by:

getBeanDefinition in interface BeanDefinitionRegistry

Parameters:

beanName - name of the bean to find a definition for

Returns:

the BeanDefinition for the given name (never null)

Throws:

NoSuchBeanDefinitionException - if there is no such bean definition

isBeanNameInUse

public boolean isBeanNameInUse(String beanName)

Description copied from interface: BeanDefinitionRegistry

Determine whether the given bean name is already in use within this registry, i.e. whether there is a local bean or alias registered under this name.

Specified by:

isBeanNameInUse in interface BeanDefinitionRegistry

Parameters:

beanName - the name to check

Returns:

whether the given bean name is already in use

registerAlias

public void registerAlias(String beanName,
                          String alias)

Description copied from interface: AliasRegistry

Given a name, register an alias for it.

Specified by:

registerAlias in interface AliasRegistry

Parameters:

beanName - the canonical name

alias - the alias to be registered

removeAlias

public void removeAlias(String alias)

Description copied from interface: AliasRegistry

Remove the specified alias from this registry.

Specified by:

removeAlias in interface AliasRegistry

Parameters:

alias - the alias to remove

isAlias

public boolean isAlias(String beanName)

Description copied from interface: AliasRegistry

Determine whether this given name is defines as an alias (as opposed to the name of an actually registered component).

Specified by:

isAlias in interface AliasRegistry

Parameters:

beanName - the bean name to check

Returns:

whether the given name is an alias