org.apache.tapestry5

## Class PageCallback

- java.lang.Object
- - org.apache.tapestry5.PageCallback

- All Implemented Interfaces:
    Serializable

      @ImmutableSessionPersistedObject
      public class PageCallback
      extends Object
      implements Serializable

  A way of capturing the name of a page and the page activation context so that, at a future date, the page can be invoked with that data. This kind of callback is very useful when creating more complicated workflows, where access to a page is "interrupted" with some operation before returning (via a callback) to the original flow. Since the callback is serializable, it can be stored in the session.
  Since:
    5.2.0
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `PageCallback(String pageName)`
    `PageCallback(String pageName, EventContext activationContext)`
    `PageCallback(String pageName, String[] activationContext)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected String` | `activationContextDescription()` Returns the activation context as a string of value separated by slashes.
    `String` | `getPageName()`
    `protected boolean` | `hasActivationContext()` Does the activation context have any values?
    `Link` | `toLink(PageRenderLinkSource linkSource)` Converts the callback (the page name and activation context) to a link; such a link may be returned from a event handler method to cause Tapestry to redirect to the page.
    `String` | `toString()`

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

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

- - ### Constructor Detail

    - #### PageCallback

          public PageCallback(String pageName,
                              String[] activationContext)

    - #### PageCallback

          public PageCallback(String pageName,
                              EventContext activationContext)

    - #### PageCallback

          public PageCallback(String pageName)

  - ### Method Detail

    - #### getPageName

          public String getPageName()

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

    - #### hasActivationContext

          protected final boolean hasActivationContext()

      Does the activation context have any values? Used, typically, inside an override of `toString()`.

    - #### activationContextDescription

          protected final String activationContextDescription()

      Returns the activation context as a string of value separated by slashes. Typically used inside an override of `toString()`.

    - #### toLink

          public Link toLink(PageRenderLinkSource linkSource)

      Converts the callback (the page name and activation context) to a link; such a link may be returned from a event handler method to cause Tapestry to redirect to the page. Most of the details are encapsulated inside the `PageRenderLinkSource` service.
      Parameters:
        `linkSource` - used to generate the link
      Returns:
        link corresponding to this callback

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