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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`getMessage(String code, Object[] args, String defaultMessage, Locale locale)`	Try to resolve the message.
`String`	`getMessage(String code, Object[] 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.
`MessageSource`	`getParentMessageSource()`	Return the parent of this MessageSource, or `null` if none.
`void`	`setParentMessageSource(MessageSource parent)`	Set the parent that will be used to try to resolve messages that this object can't resolve.

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, toString, wait, wait, wait

- Constructor Detail
  - DelegatingMessageSource
```
public DelegatingMessageSource()
```
- Method Detail
  - setParentMessageSource
```
public void setParentMessageSource(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 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 String getMessage(String code,
                         Object[] args,
                         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, e.g. '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[] 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, e.g. '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

Class DelegatingMessageSource

Field Summary

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

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

Constructor Detail

DelegatingMessageSource

Method Detail

setParentMessageSource

getParentMessageSource

getMessage

getMessage

getMessage