org.springframework.web.servlet.view
Class ResourceBundleViewResolver

java.lang.Object
  org.springframework.context.support.ApplicationObjectSupport
      org.springframework.web.context.support.WebApplicationObjectSupport
          org.springframework.web.servlet.view.AbstractCachingViewResolver
              org.springframework.web.servlet.view.ResourceBundleViewResolver

All Implemented Interfaces:

DisposableBean, InitializingBean, ApplicationContextAware, Ordered, ServletContextAware, ViewResolver

public class ResourceBundleViewResolver
extends AbstractCachingViewResolver
implements Ordered, InitializingBean, DisposableBean

ViewResolver implementation that uses bean definitions in a ResourceBundle, specified by the bundle basename.

The bundle is typically defined in a properties file, located in the class path. The default bundle basename is "views".

This ViewResolver supports localized view definitions, using the default support of PropertyResourceBundle. For example, the basename "views" will be resolved as class path resources "views_de_AT.properties", "views_de.properties", "views.properties" - for a given Locale "de_AT".

Note: this ViewResolver implements the Ordered interface to allow for flexible participation in ViewResolver chaining. For example, some special views could be defined via this ViewResolver (giving it 0 as "order" value), while all remaining views could be resolved by a UrlBasedViewResolver.

Author:

Rod Johnson, Juergen Hoeller

See Also:

ResourceBundle.getBundle(java.lang.String), PropertyResourceBundle, UrlBasedViewResolver

Field Summary

static String

DEFAULT_BASENAME The default basename if no other basename is supplied.

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

logger

Fields inherited from interface org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

Constructor Summary

ResourceBundleViewResolver()

Method Summary

void	afterPropertiesSet() Eagerly initialize Locales if necessary.
void	destroy() Close the bundle View factories on context shutdown.
protected ResourceBundle	getBundle(String basename, Locale locale) Obtain the resource bundle for the given basename and Locale.
protected ClassLoader	getBundleClassLoader() Return the ClassLoader to load resource bundles with.
int	getOrder() Return the order value of this object, with a higher value meaning greater in terms of sorting.
protected BeanFactory	initFactory(Locale locale) Initialize the View BeanFactory from the ResourceBundle, for the given locale.
protected View	loadView(String viewName, Locale locale) Subclasses must implement this method, building a View object for the specified view.
void	setBasename(String basename) Set a single basename, following ResourceBundle conventions.
void	setBasenames(String[] basenames) Set an array of basenames, each following ResourceBundle conventions.
void	setBundleClassLoader(ClassLoader classLoader) Set the ClassLoader to load resource bundles with.
void	setDefaultParentView(String defaultParentView) Set the default parent for views defined in the ResourceBundle.
void	setLocalesToInitialize(Locale[] localesToInitialize) Specify Locales to initialize eagerly, rather than lazily when actually accessed.
void	setOrder(int order)

Methods inherited from class org.springframework.web.servlet.view.AbstractCachingViewResolver

clearCache, createView, getCacheKey, isCache, removeFromCache, resolveViewName, setCache

Methods inherited from class org.springframework.web.context.support.WebApplicationObjectSupport

getServletContext, getTempDir, getWebApplicationContext, initApplicationContext, initServletContext, isContextRequired, setServletContext

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

getApplicationContext, getMessageSourceAccessor, initApplicationContext, requiredContextClass, setApplicationContext

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_BASENAME

public static final String DEFAULT_BASENAME

The default basename if no other basename is supplied.

See Also:

Constant Field Values

Constructor Detail

ResourceBundleViewResolver

public ResourceBundleViewResolver()

Method Detail

setOrder

public void setOrder(int order)

getOrder

public int getOrder()

Description copied from interface: Ordered

Return the order value of this object, with a higher value meaning greater in terms of sorting.

Normally starting with 0, with Integer.MAX_VALUE indicating the greatest value. Same order values will result in arbitrary positions for the affected objects.

Higher values can be interpreted as lower priority. As a consequence, the object with the lowest value has highest priority (somewhat analogous to Servlet "load-on-startup" values).

Specified by:

getOrder in interface Ordered

Returns:

the order value

setBasename

public void setBasename(String basename)

Set a single basename, following ResourceBundle conventions. The default is "views".

ResourceBundle supports different suffixes. For example, a base name of "views" might map to ResourceBundle files "views", "views_en_au" and "views_de".

Note that ResourceBundle names are effectively classpath locations: As a consequence, the JDK's standard ResourceBundle treats dots as package separators. This means that "test.theme" is effectively equivalent to "test/theme", just like it is for programmatic java.util.ResourceBundle usage.

See Also:

setBasenames(java.lang.String[]), ResourceBundle.getBundle(String)

setBasenames

public void setBasenames(String[] basenames)

Set an array of basenames, each following ResourceBundle conventions. The default is a single basename "views".

ResourceBundle supports different suffixes. For example, a base name of "views" might map to ResourceBundle files "views", "views_en_au" and "views_de".

The associated resource bundles will be checked sequentially when resolving a message code. Note that message definitions in a previous resource bundle will override ones in a later bundle, due to the sequential lookup.

Note that ResourceBundle names are effectively classpath locations: As a consequence, the JDK's standard ResourceBundle treats dots as package separators. This means that "test.theme" is effectively equivalent to "test/theme", just like it is for programmatic java.util.ResourceBundle usage.

See Also:

setBasename(java.lang.String), ResourceBundle.getBundle(String)

setBundleClassLoader

public void setBundleClassLoader(ClassLoader classLoader)

Set the ClassLoader to load resource bundles with. Default is the thread context ClassLoader.

getBundleClassLoader

protected ClassLoader getBundleClassLoader()

Return the ClassLoader to load resource bundles with.

Default is the specified bundle ClassLoader, usually the thread context ClassLoader.

setDefaultParentView

public void setDefaultParentView(String defaultParentView)

Set the default parent for views defined in the ResourceBundle.

This avoids repeated "yyy1.(parent)=xxx", "yyy2.(parent)=xxx" definitions in the bundle, especially if all defined views share the same parent.

The parent will typically define the view class and common attributes. Concrete views might simply consist of an URL definition then: a la "yyy1.url=/my.jsp", "yyy2.url=/your.jsp".

View definitions that define their own parent or carry their own class can still override this. Strictly speaking, the rule that a default parent setting does not apply to a bean definition that carries a class is there for backwards compatiblity reasons. It still matches the typical use case.

setLocalesToInitialize

public void setLocalesToInitialize(Locale[] localesToInitialize)

Specify Locales to initialize eagerly, rather than lazily when actually accessed.

Allows for pre-initialization of common Locales, eagerly checking the view configuration for those Locales.

afterPropertiesSet

public void afterPropertiesSet()
                        throws BeansException

Eagerly initialize Locales if necessary.

Specified by:

afterPropertiesSet in interface InitializingBean

Throws:

BeansException

See Also:

setLocalesToInitialize(java.util.Locale[])

loadView

protected View loadView(String viewName,
                        Locale locale)
                 throws Exception

Description copied from class: AbstractCachingViewResolver

Subclasses must implement this method, building a View object for the specified view. The returned View objects will be cached by this ViewResolver base class.

Subclasses are not forced to support internationalization: A subclass that does not may simply ignore the locale parameter.

Specified by:

loadView in class AbstractCachingViewResolver

Parameters:

viewName - the name of the view to retrieve

locale - the Locale to retrieve the view for

Returns:

the View instance, or null if not found (optional, to allow for ViewResolver chaining)

Throws:

Exception - if the view couldn't be resolved

See Also:

AbstractCachingViewResolver.resolveViewName(java.lang.String, java.util.Locale)

initFactory

protected BeanFactory initFactory(Locale locale)
                           throws BeansException

Initialize the View BeanFactory from the ResourceBundle, for the given locale.

Synchronized because of access by parallel threads.

Parameters:

locale - the target Locale

Returns:

the View factory for the given Locale

Throws:

BeansException - in case of initialization errors

getBundle

protected ResourceBundle getBundle(String basename,
                                   Locale locale)
                            throws MissingResourceException

Obtain the resource bundle for the given basename and Locale.

Parameters:

basename - the basename to look for

locale - the Locale to look for

Returns:

the corresponding ResourceBundle

Throws:

MissingResourceException - if no matching bundle could be found

See Also:

ResourceBundle.getBundle(String, java.util.Locale, ClassLoader)

destroy

public void destroy()
             throws BeansException

Close the bundle View factories on context shutdown.

Specified by:

destroy in interface DisposableBean

Throws:

BeansException