org.apache.turbine.services.template

## Interface TemplateEngineService

- All Known Implementing Classes:
    BaseTemplateEngineService, TurbineJspService, TurbineVelocityService

      public interface TemplateEngineService

  This is the interface that all template engine services must adhere to. This includes the Velocity, WebMacro, FreeMarker, and JSP services.
  Version:
    $Id: TemplateEngineService.java 1706239 2015-10-01 13:18:35Z tv $
  Author:
    Jason van Zyl, Daniel Rall

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `DEFAULT_ERROR_SCREEN` Configuration key
    `static String` | `DEFAULT_LAYOUT` Configuration key
    `static String` | `DEFAULT_LAYOUT_TEMPLATE` Configuration key
    `static String` | `DEFAULT_NAVIGATION` Configuration key
    `static String` | `DEFAULT_NAVIGATION_TEMPLATE` Configuration key
    `static String` | `DEFAULT_PAGE` Configuration key
    `static String` | `DEFAULT_SCREEN` Configuration key
    `static String` | `DEFAULT_SCREEN_TEMPLATE` Configuration key
    `static String` | `DEFAULT_TEMPLATE_EXTENSION` Configuration key
    `static String` | `TEMPLATE_EXTENSIONS` Configuration key

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `String[]` | `getAssociatedFileExtensions()` Supplies the file extension to key this engine in `TemplateService`'s registry with.
    `Hashtable<String,Object>` | `getTemplateEngineServiceConfiguration()` Return the configuration of the template engine in the form of a Hashtable.
    `void` | `registerConfiguration(String defaultExt)` Initializes file extension associations and registers with the template service.
    `boolean` | `templateExists(String template)` Use the specific template engine to determine whether a given template exists.

- - ### Field Detail

    - #### TEMPLATE_EXTENSIONS

          static final String TEMPLATE_EXTENSIONS

      Configuration key
      See Also:
        Constant Field Values

    - #### DEFAULT_TEMPLATE_EXTENSION

          static final String DEFAULT_TEMPLATE_EXTENSION

      Configuration key
      See Also:
        Constant Field Values

    - #### DEFAULT_PAGE

          static final String DEFAULT_PAGE

      Configuration key
      See Also:
        Constant Field Values

    - #### DEFAULT_SCREEN

          static final String DEFAULT_SCREEN

      Configuration key
      See Also:
        Constant Field Values

    - #### DEFAULT_LAYOUT

          static final String DEFAULT_LAYOUT

      Configuration key
      See Also:
        Constant Field Values

    - #### DEFAULT_NAVIGATION

          static final String DEFAULT_NAVIGATION

      Configuration key
      See Also:
        Constant Field Values

    - #### DEFAULT_ERROR_SCREEN

          static final String DEFAULT_ERROR_SCREEN

      Configuration key
      See Also:
        Constant Field Values

    - #### DEFAULT_LAYOUT_TEMPLATE

          static final String DEFAULT_LAYOUT_TEMPLATE

      Configuration key
      See Also:
        Constant Field Values

    - #### DEFAULT_SCREEN_TEMPLATE

          static final String DEFAULT_SCREEN_TEMPLATE

      Configuration key
      See Also:
        Constant Field Values

    - #### DEFAULT_NAVIGATION_TEMPLATE

          static final String DEFAULT_NAVIGATION_TEMPLATE

      Configuration key
      See Also:
        Constant Field Values

  - ### Method Detail

    - #### getTemplateEngineServiceConfiguration

          Hashtable<String,Object> getTemplateEngineServiceConfiguration()

      Return the configuration of the template engine in the form of a Hashtable.
      Returns:
        the template engine service configuration map

    - #### registerConfiguration

          void registerConfiguration(String defaultExt)

      Initializes file extension associations and registers with the template service.
      Parameters:
        `defaultExt` - The default file extension association to use in case of properties file misconfiguration.

    - #### getAssociatedFileExtensions

          String[] getAssociatedFileExtensions()

      Supplies the file extension to key this engine in `TemplateService`'s registry with.
      Returns:
        the list of extensions this engine supports

    - #### templateExists

          boolean templateExists(String template)

      Use the specific template engine to determine whether a given template exists. This allows Turbine the TemplateService to delegate the search for a template to the template engine being used for the view. This gives us the advantage of fully utilizing the capabilities of template engine with respect to retrieving templates from arbitrary sources.
      Parameters:
        `template` - The name of the template to check the existence of.
      Returns:
        Whether the specified template exists.

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