com.opensymphony.xwork2.util

Class LocalizedTextUtil

java.lang.Object

com.opensymphony.xwork2.util.LocalizedTextUtil

public class LocalizedTextUtil
extends Object

Provides support for localization in XWork.

Resource bundles are searched in the following order:

1. ActionClass.properties
2. Interface.properties (every interface and sub-interface)
3. BaseClass.properties (all the way to Object.properties)
4. ModelDriven's model (if implements ModelDriven), for the model object repeat from 1
5. package.properties (of the directory where class is located and every parent directory all the way to the root directory)
6. search up the i18n message key hierarchy itself
7. global resource properties

To clarify #5, while traversing the package hierarchy, Struts 2 will look for a file package.properties:

com/
acme/
package.properties
actions/
package.properties
FooAction.java
FooAction.properties

If FooAction.properties does not exist, com/acme/action/package.properties will be searched for, if not found com/acme/package.properties, if not found com/package.properties, etc.

A global resource bundle could be specified programmatically, as well as the locale.

Author:

Jason Carreira, Mark Woon, Rainer Hermanns, tm_jee

Constructor Summary

Constructors

Constructor and Description
LocalizedTextUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static void	addDefaultResourceBundle(String resourceBundleName) Add's the bundle to the internal list of default bundles.
static void	clearBundle(String bundleName) Removes the bundle from any cached "misses"
static void	clearDefaultResourceBundles() Clears the internal list of resource bundles.
static String	findDefaultText(String aTextName, Locale locale) Returns a localized message for the specified key, aTextName.
static String	findDefaultText(String aTextName, Locale locale, Object[] params) Returns a localized message for the specified key, aTextName, substituting variables from the array of params into the message.
static ResourceBundle	findResourceBundle(String aBundleName, Locale locale) Finds the given resource bundle by it's name.
static String	findText(Class aClass, String aTextName, Locale locale) Calls findText(Class aClass, String aTextName, Locale locale, String defaultMessage, Object[] args) with aTextName as the default message.
static String	findText(Class aClass, String aTextName, Locale locale, String defaultMessage, Object[] args) Finds a localized text message for the given key, aTextName.
static String	findText(Class aClass, String aTextName, Locale locale, String defaultMessage, Object[] args, ValueStack valueStack) Finds a localized text message for the given key, aTextName.
static String	findText(ResourceBundle bundle, String aTextName, Locale locale) Finds a localized text message for the given key, aTextName, in the specified resource bundle with aTextName as the default message.
static String	findText(ResourceBundle bundle, String aTextName, Locale locale, String defaultMessage, Object[] args) Finds a localized text message for the given key, aTextName, in the specified resource bundle.
static String	findText(ResourceBundle bundle, String aTextName, Locale locale, String defaultMessage, Object[] args, ValueStack valueStack) Finds a localized text message for the given key, aTextName, in the specified resource bundle.
static Locale	localeFromString(String localeStr, Locale defaultLocale) Builds a Locale from a String of the form en_US_foo into a Locale with language "en", country "US" and variant "foo".
static void	reset() Clears all the internal lists.
static void	setDelegatedClassLoader(ClassLoader classLoader) Sets a ClassLoader to look up the bundle from if none can be found on the current thread's classloader
static void	setDevMode(boolean devMode)
static void	setReloadBundles(boolean reloadBundles) Should resorce bundles be reloaded.

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalizedTextUtil

public LocalizedTextUtil()

Method Detail

clearDefaultResourceBundles

public static void clearDefaultResourceBundles()

Clears the internal list of resource bundles.

setReloadBundles

public static void setReloadBundles(boolean reloadBundles)

Should resorce bundles be reloaded.

Parameters:

reloadBundles - reload bundles?

setDevMode

public static void setDevMode(boolean devMode)

addDefaultResourceBundle

public static void addDefaultResourceBundle(String resourceBundleName)

Add's the bundle to the internal list of default bundles.

If the bundle already exists in the list it will be readded.

Parameters:

resourceBundleName - the name of the bundle to add.

localeFromString

public static Locale localeFromString(String localeStr,
                      Locale defaultLocale)

Builds a Locale from a String of the form en_US_foo into a Locale with language "en", country "US" and variant "foo". This will parse the output of Locale.toString().

Parameters:

localeStr - The locale String to parse.

defaultLocale - The locale to use if localeStr is null.

Returns:

requested Locale

findDefaultText

public static String findDefaultText(String aTextName,
                     Locale locale)

Returns a localized message for the specified key, aTextName. Neither the key nor the message is evaluated.

Parameters:

aTextName - the message key

locale - the locale the message should be for

Returns:

a localized message based on the specified key, or null if no localized message can be found for it

findDefaultText

public static String findDefaultText(String aTextName,
                     Locale locale,
                     Object[] params)

Returns a localized message for the specified key, aTextName, substituting variables from the array of params into the message. Neither the key nor the message is evaluated.

Parameters:

aTextName - the message key

locale - the locale the message should be for

params - an array of objects to be substituted into the message text

Returns:

A formatted message based on the specified key, or null if no localized message can be found for it

findResourceBundle

public static ResourceBundle findResourceBundle(String aBundleName,
                                Locale locale)

Finds the given resource bundle by it's name.

Will use Thread.currentThread().getContextClassLoader() as the classloader.

Parameters:

aBundleName - the name of the bundle (usually it's FQN classname).

locale - the locale.

Returns:

the bundle, null if not found.

setDelegatedClassLoader

public static void setDelegatedClassLoader(ClassLoader classLoader)

Sets a ClassLoader to look up the bundle from if none can be found on the current thread's classloader

clearBundle

public static void clearBundle(String bundleName)

Removes the bundle from any cached "misses"

findText

public static String findText(Class aClass,
              String aTextName,
              Locale locale)

Calls findText(Class aClass, String aTextName, Locale locale, String defaultMessage, Object[] args) with aTextName as the default message.

See Also:

findText(Class aClass, String aTextName, Locale locale, String defaultMessage, Object[] args)

findText

public static String findText(Class aClass,
              String aTextName,
              Locale locale,
              String defaultMessage,
              Object[] args)

Finds a localized text message for the given key, aTextName. Both the key and the message itself is evaluated as required. The following algorithm is used to find the requested message:

1. Look for message in aClass' class hierarchy.
   1. Look for the message in a resource bundle for aClass
   2. If not found, look for the message in a resource bundle for any implemented interface
   3. If not found, traverse up the Class' hierarchy and repeat from the first sub-step
2. If not found and aClass is a ModelDriven Action, then look for message in the model's class hierarchy (repeat sub-steps listed above).
3. If not found, look for message in child property. This is determined by evaluating the message key as an OGNL expression. For example, if the key is user.address.state, then it will attempt to see if "user" can be resolved into an object. If so, repeat the entire process fromthe beginning with the object's class as aClass and "address.state" as the message key.
4. If not found, look for the message in aClass' package hierarchy.
5. If still not found, look for the message in the default resource bundles.
6. Return defaultMessage

When looking for the message, if the key indexes a collection (e.g. user.phone[0]) and a message for that specific key cannot be found, the general form will also be looked up (i.e. user.phone[*]).

If a message is found, it will also be interpolated. Anything within ${...} will be treated as an OGNL expression and evaluated as such.

Parameters:

aClass - the class whose name to use as the start point for the search

aTextName - the key to find the text message for

locale - the locale the message should be for

defaultMessage - the message to be returned if no text message can be found in any resource bundle

args - arguments resource bundle

Returns:

the localized text, or null if none can be found and no defaultMessage is provided

findText

public static String findText(Class aClass,
              String aTextName,
              Locale locale,
              String defaultMessage,
              Object[] args,
              ValueStack valueStack)

Finds a localized text message for the given key, aTextName. Both the key and the message itself is evaluated as required. The following algorithm is used to find the requested message:

1. Look for message in aClass' class hierarchy.
   1. Look for the message in a resource bundle for aClass
   2. If not found, look for the message in a resource bundle for any implemented interface
   3. If not found, traverse up the Class' hierarchy and repeat from the first sub-step
2. If not found and aClass is a ModelDriven Action, then look for message in the model's class hierarchy (repeat sub-steps listed above).
3. If not found, look for message in child property. This is determined by evaluating the message key as an OGNL expression. For example, if the key is user.address.state, then it will attempt to see if "user" can be resolved into an object. If so, repeat the entire process fromthe beginning with the object's class as aClass and "address.state" as the message key.
4. If not found, look for the message in aClass' package hierarchy.
5. If still not found, look for the message in the default resource bundles.
6. Return defaultMessage

When looking for the message, if the key indexes a collection (e.g. user.phone[0]) and a message for that specific key cannot be found, the general form will also be looked up (i.e. user.phone[*]).

If a message is found, it will also be interpolated. Anything within ${...} will be treated as an OGNL expression and evaluated as such.

If a message is not found a WARN log will be logged.

Parameters:

aClass - the class whose name to use as the start point for the search

aTextName - the key to find the text message for

locale - the locale the message should be for

defaultMessage - the message to be returned if no text message can be found in any resource bundle

args - arguments

valueStack - the value stack to use to evaluate expressions instead of the one in the ActionContext ThreadLocal

Returns:

the localized text, or null if none can be found and no defaultMessage is provided

findText

public static String findText(ResourceBundle bundle,
              String aTextName,
              Locale locale)

Finds a localized text message for the given key, aTextName, in the specified resource bundle with aTextName as the default message.

If a message is found, it will also be interpolated. Anything within ${...} will be treated as an OGNL expression and evaluated as such.

See Also:

findText(java.util.ResourceBundle, String, java.util.Locale, String, Object[])

findText

public static String findText(ResourceBundle bundle,
              String aTextName,
              Locale locale,
              String defaultMessage,
              Object[] args)

Finds a localized text message for the given key, aTextName, in the specified resource bundle.

If a message is found, it will also be interpolated. Anything within ${...} will be treated as an OGNL expression and evaluated as such.

If a message is not found a WARN log will be logged.

Parameters:

bundle - the bundle

aTextName - the key

locale - the locale

defaultMessage - the default message to use if no message was found in the bundle

args - arguments for the message formatter.

findText

public static String findText(ResourceBundle bundle,
              String aTextName,
              Locale locale,
              String defaultMessage,
              Object[] args,
              ValueStack valueStack)

Finds a localized text message for the given key, aTextName, in the specified resource bundle.

If a message is found, it will also be interpolated. Anything within ${...} will be treated as an OGNL expression and evaluated as such.

If a message is not found a WARN log will be logged.

Parameters:

bundle - the bundle

aTextName - the key

locale - the locale

defaultMessage - the default message to use if no message was found in the bundle

args - arguments for the message formatter.

valueStack - the OGNL value stack.

reset

public static void reset()

Clears all the internal lists.