org.apache.struts2.convention

## Class ConventionUnknownHandler

- java.lang.Object
- - org.apache.struts2.convention.ConventionUnknownHandler

- All Implemented Interfaces:
    UnknownHandler

      public class ConventionUnknownHandler
      extends Object
      implements UnknownHandler

  This class is the default unknown handler for all of the Convention plugin integration with XWork. This handles instances when a URL doesn't have an action associated with it but does a viable result and also the instance where an action returns a result code that isn't already configured but there is a viable result for the code.

  This class also handles all of the index actions using redirects and actions in nested packages. For example, if there is an action /foo/index and the URL /foo is used, this will render the index action in the /foo namespace.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `ConventionUnknownHandler.Resource`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected Set<String>` | `allowedMethods`
    `protected Configuration` | `configuration`
    `protected String` | `defaultParentPackageName`
    `protected ObjectFactory` | `objectFactory`
    `protected PackageConfig` | `parentPackage`
    `protected ResultMapBuilder` | `resultMapBuilder`
    `protected javax.servlet.ServletContext` | `servletContext`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `ConventionUnknownHandler(Configuration configuration, ObjectFactory objectFactory, javax.servlet.ServletContext servletContext, Container container, String defaultParentPackageName, String redirectToSlash, String nameSeparator)` Constructs the unknown handler.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected ActionConfig` | `buildActionConfig(String path, ResultTypeConfig resultTypeConfig)`
    `protected Result` | `buildResult(String path, String resultCode, ResultTypeConfig config, ActionContext invocationContext)`
    `protected String` | `canonicalize(String path)`
    `protected String` | `determinePath(ActionConfig actionConfig, String namespace)` Determines the result path prefix that the request URL is for, minus the action name.
    `protected ConventionUnknownHandler.Resource` | `findResource(Map<String,ResultTypeConfig> resultsByExtension, String... parts)` Finds a resource using the given path parts and all of the extensions in the map.
    `protected Result` | `findResult(String path, String resultCode, String ext, ActionContext actionContext, Map<String,ResultTypeConfig> resultsByExtension)`
    `ActionConfig` | `handleUnknownAction(String namespace, String actionName)`
    `Object` | `handleUnknownActionMethod(Object action, String methodName)` Not used
    `Result` | `handleUnknownResult(ActionContext actionContext, String actionName, ActionConfig actionConfig, String resultCode)`
    `protected String` | `string(String... parts)`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### configuration

          protected Configuration configuration

    - #### objectFactory

          protected ObjectFactory objectFactory

    - #### servletContext

          protected javax.servlet.ServletContext servletContext

    - #### resultMapBuilder

          protected ResultMapBuilder resultMapBuilder

    - #### defaultParentPackageName

          protected String defaultParentPackageName

    - #### parentPackage

          protected PackageConfig parentPackage

    - #### allowedMethods

          protected Set<String> allowedMethods

  - ### Constructor Detail

    - #### ConventionUnknownHandler

          public ConventionUnknownHandler(Configuration configuration,
                                  ObjectFactory objectFactory,
                                  javax.servlet.ServletContext servletContext,
                                  Container container,
                                  String defaultParentPackageName,
                                  String redirectToSlash,
                                  String nameSeparator)

      Constructs the unknown handler.
      Parameters:
        `configuration` - The XWork configuration.
        `objectFactory` - The XWork object factory used to create result instances.
        `servletContext` - The servlet context used to help build the action configurations.
        `container` - The Xwork container
        `defaultParentPackageName` - The default XWork package that the unknown handler will use as the parent package for new actions and results.
        `redirectToSlash` - A boolean parameter that controls whether or not this will handle unknown actions in the same manner as Apache, Tomcat and other web servers. This handling will send back a redirect for URLs such as /foo to /foo/ if there doesn't exist an action that responds to /foo.
        `nameSeparator` - The character used as word separator in the action names. "-" by default

  - ### Method Detail

    - #### handleUnknownAction

          public ActionConfig handleUnknownAction(String namespace,
                                         String actionName)
                                           throws XWorkException

      Specified by:
        `handleUnknownAction` in interface `UnknownHandler`
      Throws:
        `XWorkException`

    - #### findResource

          protected ConventionUnknownHandler.Resource findResource(Map<String,ResultTypeConfig> resultsByExtension,
                                                       String... parts)

      Finds a resource using the given path parts and all of the extensions in the map.
      Parameters:
        `resultsByExtension` - Map of extension to result type config objects.
        `parts` - The parts of the resource.
      Returns:
        The resource path or null.

    - #### canonicalize

          protected String canonicalize(String path)

    - #### buildActionConfig

          protected ActionConfig buildActionConfig(String path,
                                       ResultTypeConfig resultTypeConfig)

    - #### handleUnknownResult

          public Result handleUnknownResult(ActionContext actionContext,
                                   String actionName,
                                   ActionConfig actionConfig,
                                   String resultCode)
                                     throws XWorkException

      Specified by:
        `handleUnknownResult` in interface `UnknownHandler`
      Throws:
        `XWorkException`

    - #### findResult

          protected Result findResult(String path,
                          String resultCode,
                          String ext,
                          ActionContext actionContext,
                          Map<String,ResultTypeConfig> resultsByExtension)

    - #### buildResult

          protected Result buildResult(String path,
                           String resultCode,
                           ResultTypeConfig config,
                           ActionContext invocationContext)

    - #### string

          protected String string(String... parts)

    - #### determinePath

          protected String determinePath(ActionConfig actionConfig,
                             String namespace)

      Determines the result path prefix that the request URL is for, minus the action name. This includes the base result location and the namespace, with all the slashes handled.
      Parameters:
        `actionConfig` - (Optional) The might be a ConventionActionConfig, from which we can get the default base result location of that specific action.
        `namespace` - The current URL namespace.
      Returns:
        The path prefix and never null.

    - #### handleUnknownActionMethod

          public Object handleUnknownActionMethod(Object action,
                                         String methodName)

      Not used
      Specified by:
        `handleUnknownActionMethod` in interface `UnknownHandler`

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