Package org.springframework.context.support

Class DelegatingMessageSource

java.lang.Object

org.springframework.context.support.MessageSourceSupport

org.springframework.context.support.DelegatingMessageSource

All Implemented Interfaces:

HierarchicalMessageSource, MessageSource

public class DelegatingMessageSource
extends MessageSourceSupport
implements HierarchicalMessageSource

Empty MessageSource that delegates all calls to the parent MessageSource. If no parent is available, it simply won't resolve any message.

Used as placeholder by AbstractApplicationContext, if the context doesn't define its own MessageSource. Not intended for direct use in applications.

Since:

1.1.5

Author:

Juergen Hoeller

See Also:

• AbstractApplicationContext

Field Summary

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

logger

Constructor Summary

Constructors

Constructor	Description
DelegatingMessageSource()

Method Summary

Modifier and Type	Method	Description
@Nullable String	getMessage(String code, Object @Nullable [] args, @Nullable String defaultMessage, Locale locale)	Try to resolve the message.
String	getMessage(String code, Object @Nullable [] args, Locale locale)	Try to resolve the message.
String	getMessage(MessageSourceResolvable resolvable, Locale locale)	Try to resolve the message using all the attributes contained within the MessageSourceResolvable argument that was passed in.
@Nullable MessageSource	getParentMessageSource()	Return the parent of this MessageSource, or null if none.
void	setParentMessageSource(@Nullable MessageSource parent)	Set the parent that will be used to try to resolve messages that this object can't resolve.
String	toString()

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

createMessageFormat, formatMessage, isAlwaysUseMessageFormat, renderDefaultMessage, resolveArguments, setAlwaysUseMessageFormat

Methods inherited from class java.lang.Object

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

Constructor Details

DelegatingMessageSource

public DelegatingMessageSource()

Method Details

setParentMessageSource

public void setParentMessageSource(@Nullable MessageSource parent)

Description copied from interface: HierarchicalMessageSource

Set the parent that will be used to try to resolve messages that this object can't resolve.

Specified by:

setParentMessageSource in interface HierarchicalMessageSource

Parameters:

parent - the parent MessageSource that will be used to resolve messages that this object can't resolve. May be null, in which case no further resolution is possible.

getParentMessageSource

public @Nullable MessageSource getParentMessageSource()

Description copied from interface: HierarchicalMessageSource

Return the parent of this MessageSource, or null if none.

Specified by:

getParentMessageSource in interface HierarchicalMessageSource

getMessage

public @Nullable String getMessage(String code,
 Object @Nullable [] args,
 @Nullable String defaultMessage,
 Locale locale)

Description copied from interface: MessageSource

Try to resolve the message. Return default message if no message was found.

Specified by:

getMessage in interface MessageSource

Parameters:

code - the message code to look up, for example, 'calculator.noRateSet'. MessageSource users are encouraged to base message names on qualified class or package names, avoiding potential conflicts and ensuring maximum clarity.

args - an array of arguments that will be filled in for params within the message (params look like "{0}", "{1,date}", "{2,time}" within a message), or null if none

defaultMessage - a default message to return if the lookup fails

locale - the locale in which to do the lookup

Returns:

the resolved message if the lookup was successful, otherwise the default message passed as a parameter (which may be null)

See Also:

• MessageSource.getMessage(MessageSourceResolvable, Locale)
• MessageFormat

getMessage

public String getMessage(String code,
 Object @Nullable [] args,
 Locale locale)
                  throws NoSuchMessageException

Description copied from interface: MessageSource

Try to resolve the message. Treat as an error if the message can't be found.

Specified by:

getMessage in interface MessageSource

Parameters:

code - the message code to look up, for example, 'calculator.noRateSet'. MessageSource users are encouraged to base message names on qualified class or package names, avoiding potential conflicts and ensuring maximum clarity.

args - an array of arguments that will be filled in for params within the message (params look like "{0}", "{1,date}", "{2,time}" within a message), or null if none

locale - the locale in which to do the lookup

Returns:

the resolved message (never null)

Throws:

NoSuchMessageException - if no corresponding message was found

See Also:

• MessageSource.getMessage(MessageSourceResolvable, Locale)
• MessageFormat

getMessage

public String getMessage(MessageSourceResolvable resolvable,
 Locale locale)
                  throws NoSuchMessageException

Description copied from interface: MessageSource

Try to resolve the message using all the attributes contained within the MessageSourceResolvable argument that was passed in.

NOTE: We must throw a NoSuchMessageException on this method since at the time of calling this method we aren't able to determine if the defaultMessage property of the resolvable is null or not.

Specified by:

getMessage in interface MessageSource

Parameters:

resolvable - the value object storing attributes required to resolve a message (may include a default message)

locale - the locale in which to do the lookup

Returns:

the resolved message (never null since even a MessageSourceResolvable-provided default message needs to be non-null)

Throws:

NoSuchMessageException - if no corresponding message was found (and no default message was provided by the MessageSourceResolvable)

See Also:

• MessageSourceResolvable.getCodes()
• MessageSourceResolvable.getArguments()
• MessageSourceResolvable.getDefaultMessage()
• MessageFormat

toString

public String toString()

Overrides:

toString in class Object