org.apache.tapestry5.ioc

## Interface Messages

- All Known Implementing Classes:
    AbstractMessages, MapMessages, MessagesImpl

      public interface Messages

  Provides access to a messages catalog, a set of properties files that provide localized messages for a particular locale. The message catalog consists of keys and values and follows the semantics of a Java `ResourceBundle` with some changes.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `contains(String key)` Returns true if the bundle contains the named key.
    `String` | `format(String key, Object... args)` Convenience for accessing a formatter and formatting a localized message with arguments.
    `String` | `get(String key)` Returns the localized message for the given key.
    `MessageFormatter` | `getFormatter(String key)` Returns a formatter for the message, which can be used to substitute arguments (as per `Formatter`).
    `Set<String>` | `getKeys()` Returns a set of all the keys for which this instance may provide a value.

- - ### Method Detail

    - #### contains

          boolean contains(String key)

      Returns true if the bundle contains the named key.

    - #### get

          String get(String key)

      Returns the localized message for the given key. If catalog does not contain such a key, then a modified version of the key is returned (converted to upper case and enclosed in brackets).
      Parameters:
        `key` -
      Returns:
        localized message for key, or placeholder

    - #### getFormatter

          MessageFormatter getFormatter(String key)

      Returns a formatter for the message, which can be used to substitute arguments (as per `Formatter`).
      Parameters:
        `key` -
      Returns:
        formattable object

    - #### format

          String format(String key,
                        Object... args)

      Convenience for accessing a formatter and formatting a localized message with arguments.

    - #### getKeys

          Set<String> getKeys()

      Returns a set of all the keys for which this instance may provide a value.
      Returns:
        set of keys
      Since:
        5.4

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