com.opensymphony.xwork2

## Interface TextProvider

- All Known Subinterfaces:
    ResourceBundleTextProvider, ValidatorContext
  All Known Implementing Classes:
    ActionSupport, CompositeTextProvider, DefaultActionSupport, DefaultTextProvider, DelegatingValidatorContext, TextProviderSupport, VisitorFieldValidator.AppendingValidatorContext

      public interface TextProvider

  Provides access to `ResourceBundle`s and their underlying text messages. Implementing classes can delegate `TextProviderSupport`. Messages will be searched in multiple resource bundles, starting with the one associated with this particular class (action in most cases), continuing to try the message bundle associated with each superclass as well. It will stop once a bundle is found that contains the given text. This gives a cascading style that allow global texts to be defined for an application base class.

  You can override `LocaleProvider.getLocale()` to change the behaviour of how to choose locale for the bundles that are returned. Typically you would use the `LocaleProvider` interface to get the users configured locale.

  When you want to use your own implementation for Struts 2 project you have to define following bean and constant in struts.xml: <bean class="org.demo.MyTextProvider" name="myTextProvider" type="com.opensymphony.xwork2.TextProvider" /> <constant name="struts.xworkTextProvider" value="myTextProvider" />

  if you want to also use your implementation for framework's messages define another constant (remember to put into it all framework messages) <constant name="system" value="myTextProvider" />

  Take a look on `ActionSupport` for example TextProvider implementation.

  Author:
    Jason Carreira, Rainer Hermanns
  See Also:
    `LocaleProvider`, `TextProviderSupport`

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `String` | `getText(String key)` Gets a message based on a message key or if no message is found the provided key is returned.
    `String` | `getText(String key, List<?> args)` Gets a message based on a key using the supplied args, as defined in `MessageFormat` or the provided key if no message is found.
    `String` | `getText(String key, String defaultValue)` Gets a message based on a key, or, if the message is not found, a supplied default value is returned.
    `String` | `getText(String key, String[] args)` Gets a message based on a key using the supplied args, as defined in `MessageFormat`, or the provided key if no message is found.
    `String` | `getText(String key, String defaultValue, List<?> args)` Gets a message based on a key using the supplied args, as defined in `MessageFormat`, or, if the message is not found, a supplied default value is returned.
    `String` | `getText(String key, String defaultValue, List<?> args, ValueStack stack)` Gets a message based on a key using the supplied args, as defined in `MessageFormat`, or, if the message is not found, a supplied default value is returned.
    `String` | `getText(String key, String defaultValue, String obj)` Gets a message based on a key using the supplied obj, as defined in `MessageFormat`, or, if the message is not found, a supplied default value is returned.
    `String` | `getText(String key, String defaultValue, String[] args)` Gets a message based on a key using the supplied args, as defined in `MessageFormat`, or, if the message is not found, a supplied default value is returned.
    `String` | `getText(String key, String defaultValue, String[] args, ValueStack stack)` Gets a message based on a key using the supplied args, as defined in `MessageFormat`, or, if the message is not found, a supplied default value is returned.
    `ResourceBundle` | `getTexts()` Get the resource bundle associated with the implementing class (usually an action).
    `ResourceBundle` | `getTexts(String bundleName)` Get the named bundle, such as "com/acme/Foo".
    `boolean` | `hasKey(String key)` Checks if a message key exists.

- - ### Method Detail

    - #### hasKey

          boolean hasKey(String key)

      Checks if a message key exists.
      Parameters:
        `key` - message key to check for
      Returns:
        boolean true if key exists, false otherwise.

    - #### getText

          String getText(String key)

      Gets a message based on a message key or if no message is found the provided key is returned.
      Parameters:
        `key` - the resource bundle key that is to be searched for
      Returns:
        the message as found in the resource bundle, or the provided key if none is found.

    - #### getText

          String getText(String key,
                       String defaultValue)

      Gets a message based on a key, or, if the message is not found, a supplied default value is returned.
      Parameters:
        `key` - the resource bundle key that is to be searched for
        `defaultValue` - the default value which will be returned if no message is found
      Returns:
        the message as found in the resource bundle, or defaultValue if none is found

    - #### getText

          String getText(String key,
                       String defaultValue,
                       String obj)

      Gets a message based on a key using the supplied obj, as defined in `MessageFormat`, or, if the message is not found, a supplied default value is returned.
      Parameters:
        `key` - the resource bundle key that is to be searched for
        `defaultValue` - the default value which will be returned if no message is found
        `obj` - obj to be used in a `MessageFormat` message
      Returns:
        the message as found in the resource bundle, or defaultValue if none is found

    - #### getText

          String getText(String key,
                       List<?> args)

      Gets a message based on a key using the supplied args, as defined in `MessageFormat` or the provided key if no message is found.
      Parameters:
        `key` - the resource bundle key that is to be searched for
        `args` - a list args to be used in a `MessageFormat` message
      Returns:
        the message as found in the resource bundle, or the provided key if none is found.

    - #### getText

          String getText(String key,
                       String[] args)

      Gets a message based on a key using the supplied args, as defined in `MessageFormat`, or the provided key if no message is found.
      Parameters:
        `key` - the resource bundle key that is to be searched for
        `args` - an array args to be used in a `MessageFormat` message
      Returns:
        the message as found in the resource bundle, or the provided key if none is found.

    - #### getText

          String getText(String key,
                       String defaultValue,
                       List<?> args)

      Gets a message based on a key using the supplied args, as defined in `MessageFormat`, or, if the message is not found, a supplied default value is returned.
      Parameters:
        `key` - the resource bundle key that is to be searched for
        `defaultValue` - the default value which will be returned if no message is found
        `args` - a list args to be used in a `MessageFormat` message
      Returns:
        the message as found in the resource bundle, or defaultValue if none is found

    - #### getText

          String getText(String key,
                       String defaultValue,
                       String[] args)

      Gets a message based on a key using the supplied args, as defined in `MessageFormat`, or, if the message is not found, a supplied default value is returned.
      Parameters:
        `key` - the resource bundle key that is to be searched for
        `defaultValue` - the default value which will be returned if no message is found
        `args` - an array args to be used in a `MessageFormat` message
      Returns:
        the message as found in the resource bundle, or defaultValue if none is found

    - #### getText

          String getText(String key,
                       String defaultValue,
                       List<?> args,
                       ValueStack stack)

      Gets a message based on a key using the supplied args, as defined in `MessageFormat`, or, if the message is not found, a supplied default value is returned. Instead of using the value stack in the ActionContext this version of the getText() method uses the provided value stack.
      Parameters:
        `key` - the resource bundle key that is to be searched for
        `defaultValue` - the default value which will be returned if no message is found
        `args` - a list args to be used in a `MessageFormat` message
        `stack` - the value stack to use for finding the text
      Returns:
        the message as found in the resource bundle, or defaultValue if none is found

    - #### getText

          String getText(String key,
                       String defaultValue,
                       String[] args,
                       ValueStack stack)

      Gets a message based on a key using the supplied args, as defined in `MessageFormat`, or, if the message is not found, a supplied default value is returned. Instead of using the value stack in the ActionContext this version of the getText() method uses the provided value stack.
      Parameters:
        `key` - the resource bundle key that is to be searched for
        `defaultValue` - the default value which will be returned if no message is found
        `args` - an array args to be used in a `MessageFormat` message
        `stack` - the value stack to use for finding the text
      Returns:
        the message as found in the resource bundle, or defaultValue if none is found

    - #### getTexts

          ResourceBundle getTexts(String bundleName)

      Get the named bundle, such as "com/acme/Foo".
      Parameters:
        `bundleName` - the name of the resource bundle, such as `"com/acme/Foo"`.
      Returns:
        the bundle

    - #### getTexts

          ResourceBundle getTexts()

      Get the resource bundle associated with the implementing class (usually an action).
      Returns:
        the bundle

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