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## org.springframework.context.support
Class MessageSourceSupport

    java.lang.Object
      org.springframework.context.support.MessageSourceSupport

Direct Known Subclasses:
  AbstractMessageSource, DelegatingMessageSource

    public abstract class MessageSourceSupport

extends Object

Base class for message source implementations, providing support infrastructure such as `MessageFormat` handling but not implementing concrete methods defined in the `MessageSource`.

`AbstractMessageSource` derives from this class, providing concrete `getMessage` implementations that delegate to a central template method for message code resolution.

Since:
  2.5.5
Author:
  Juergen Hoeller

Field Summary
`protected Log` | `logger` Logger available to subclasses

Constructor Summary
`MessageSourceSupport()`

Method Summary
`protected MessageFormat` | `createMessageFormat(String msg, Locale locale)` Create a MessageFormat for the given message and Locale.
`protected String` | `formatMessage(String msg, Object[] args, Locale locale)` Format the given message String, using cached MessageFormats.
`protected boolean` | `isAlwaysUseMessageFormat()` Return whether to always apply the MessageFormat rules, parsing even messages without arguments.
`protected String` | `renderDefaultMessage(String defaultMessage, Object[] args, Locale locale)` Render the given default message String.
`protected Object[]` | `resolveArguments(Object[] args, Locale locale)` Template method for resolving argument objects.
`void` | `setAlwaysUseMessageFormat(boolean alwaysUseMessageFormat)` Set whether to always apply the MessageFormat rules, parsing even messages without arguments.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### logger

    protected final Log logger

  Logger available to subclasses

Constructor Detail

### MessageSourceSupport

    public MessageSourceSupport()

Method Detail

### setAlwaysUseMessageFormat

    public void setAlwaysUseMessageFormat(boolean alwaysUseMessageFormat)

  Set whether to always apply the MessageFormat rules, parsing even messages without arguments.

  Default is "false": Messages without arguments are by default returned as-is, without parsing them through MessageFormat. Set this to "true" to enforce MessageFormat for all messages, expecting all message texts to be written with MessageFormat escaping.

  For example, MessageFormat expects a single quote to be escaped as "''". If your message texts are all written with such escaping, even when not defining argument placeholders, you need to set this flag to "true". Else, only message texts with actual arguments are supposed to be written with MessageFormat escaping.

  See Also:
    `MessageFormat`

### isAlwaysUseMessageFormat

    protected boolean isAlwaysUseMessageFormat()

  Return whether to always apply the MessageFormat rules, parsing even messages without arguments.

### renderDefaultMessage

    protected String renderDefaultMessage(String defaultMessage,
                                          Object[] args,
                                          Locale locale)

  Render the given default message String. The default message is passed in as specified by the caller and can be rendered into a fully formatted default message shown to the user.

  The default implementation passes the String to `formatMessage`, resolving any argument placeholders found in them. Subclasses may override this method to plug in custom processing of default messages.

  Parameters:
    `defaultMessage` - the passed-in default message String
    `args` - array of arguments that will be filled in for params within the message, or `null` if none.
    `locale` - the Locale used for formatting
  Returns:
    the rendered default message (with resolved arguments)
  See Also:
    `formatMessage(String, Object[], java.util.Locale)`

### formatMessage

    protected String formatMessage(String msg,
                                   Object[] args,
                                   Locale locale)

  Format the given message String, using cached MessageFormats. By default invoked for passed-in default messages, to resolve any argument placeholders found in them.

  Parameters:
    `msg` - the message to format
    `args` - array of arguments that will be filled in for params within the message, or `null` if none
    `locale` - the Locale used for formatting
  Returns:
    the formatted message (with resolved arguments)

### createMessageFormat

    protected MessageFormat createMessageFormat(String msg,
                                                Locale locale)

  Create a MessageFormat for the given message and Locale.

  Parameters:
    `msg` - the message to create a MessageFormat for
    `locale` - the Locale to create a MessageFormat for
  Returns:
    the MessageFormat instance

### resolveArguments

    protected Object[] resolveArguments(Object[] args,
                                        Locale locale)

  Template method for resolving argument objects.

  The default implementation simply returns the given argument array as-is. Can be overridden in subclasses in order to resolve special argument types.

  Parameters:
    `args` - the original argument array
    `locale` - the Locale to resolve against
  Returns:
    the resolved argument array

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