org.springframework.web.servlet.view.feed

## Class AbstractAtomFeedView

- java.lang.Object
- - org.springframework.context.support.ApplicationObjectSupport
  - - org.springframework.web.context.support.WebApplicationObjectSupport
    - - org.springframework.web.servlet.view.AbstractView
      - - org.springframework.web.servlet.view.feed.AbstractFeedView<com.sun.syndication.feed.atom.Feed>
        - - org.springframework.web.servlet.view.feed.AbstractAtomFeedView

- All Implemented Interfaces:
    Aware, BeanNameAware, ApplicationContextAware, ServletContextAware, View

      public abstract class AbstractAtomFeedView
      extends AbstractFeedView<com.sun.syndication.feed.atom.Feed>

  Abstract superclass for Atom Feed views, using java.net's ROME package.

  Application-specific view classes will extend this class. The view will be held in the subclass itself, not in a template.

  Main entry points are the `AbstractFeedView.buildFeedMetadata(Map, WireFeed, HttpServletRequest)` and `buildFeedEntries(Map, HttpServletRequest, HttpServletResponse)`.

  Thanks to Jettro Coenradie and Sergio Bossa for the original feed view prototype!

  Since:
    3.0
  Author:
    Arjen Poutsma, Juergen Hoeller
  See Also:
    `AbstractFeedView.buildFeedMetadata(Map, WireFeed, HttpServletRequest)`, `buildFeedEntries(Map, HttpServletRequest, HttpServletResponse)`, Atom Syndication Format

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `DEFAULT_FEED_TYPE`

    - ### Fields inherited from class org.springframework.web.servlet.view.AbstractView

      `DEFAULT_CONTENT_TYPE`

    - ### Fields inherited from class org.springframework.context.support.ApplicationObjectSupport

      `logger`

    - ### Fields inherited from interface org.springframework.web.servlet.View

      `PATH_VARIABLES, RESPONSE_STATUS_ATTRIBUTE, SELECTED_CONTENT_TYPE`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `AbstractAtomFeedView()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected void` | `buildFeedEntries(Map<String,Object> model, com.sun.syndication.feed.atom.Feed feed, HttpServletRequest request, HttpServletResponse response)` Invokes `buildFeedEntries(Map, HttpServletRequest, HttpServletResponse)` to get a list of feed entries.
    `protected abstract List<com.sun.syndication.feed.atom.Entry>` | `buildFeedEntries(Map<String,Object> model, HttpServletRequest request, HttpServletResponse response)` Subclasses must implement this method to build feed entries, given the model.
    `protected com.sun.syndication.feed.atom.Feed` | `newFeed()` Create a new Feed instance to hold the entries.
    `void` | `setFeedType(String feedType)` Sets the Rome feed type to use.

    - ### Methods inherited from class org.springframework.web.servlet.view.feed.AbstractFeedView

      `buildFeedMetadata, renderMergedOutputModel`

    - ### Methods inherited from class org.springframework.web.servlet.view.AbstractView

      `addStaticAttribute, createMergedOutputModel, createRequestContext, createTemporaryOutputStream, exposeModelAsRequestAttributes, generatesDownloadContent, getAttributesMap, getBeanName, getContentType, getRequestContextAttribute, getStaticAttributes, isExposePathVariables, prepareResponse, render, setAttributes, setAttributesCSV, setAttributesMap, setBeanName, setContentType, setExposePathVariables, setRequestContextAttribute, setResponseContentType, toString, writeToResponse`

    - ### Methods inherited from class org.springframework.web.context.support.WebApplicationObjectSupport

      `getServletContext, getTempDir, getWebApplicationContext, initApplicationContext, initServletContext, isContextRequired, setServletContext`

    - ### Methods inherited from class org.springframework.context.support.ApplicationObjectSupport

      `getApplicationContext, getMessageSourceAccessor, initApplicationContext, requiredContextClass, setApplicationContext`

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

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

- - ### Field Detail

    - #### DEFAULT_FEED_TYPE

          public static final String DEFAULT_FEED_TYPE

      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### AbstractAtomFeedView

          public AbstractAtomFeedView()

  - ### Method Detail

    - #### setFeedType

          public void setFeedType(String feedType)

      Sets the Rome feed type to use.

      Defaults to Atom 1.0.

      See Also:
        `WireFeed.setFeedType(String)`, `DEFAULT_FEED_TYPE`

    - #### newFeed

          protected com.sun.syndication.feed.atom.Feed newFeed()

      Create a new Feed instance to hold the entries.

      By default returns an Atom 1.0 feed, but the subclass can specify any Feed.

      Specified by:
        `newFeed` in class `AbstractFeedView<com.sun.syndication.feed.atom.Feed>`
      Returns:
        the newly created Feed instance
      See Also:
        `setFeedType(String)`

    - #### buildFeedEntries

          protected final void buildFeedEntries(Map<String,Object> model,
                              com.sun.syndication.feed.atom.Feed feed,
                              HttpServletRequest request,
                              HttpServletResponse response)
                                         throws Exception

      Invokes `buildFeedEntries(Map, HttpServletRequest, HttpServletResponse)` to get a list of feed entries.
      Specified by:
        `buildFeedEntries` in class `AbstractFeedView<com.sun.syndication.feed.atom.Feed>`
      Parameters:
        `model` - the model Map
        `feed` - the feed to add entries to
        `request` - in case we need locale etc. Shouldn't look at attributes.
        `response` - in case we need to set cookies. Shouldn't write to it.
      Throws:
        `Exception` - any exception that occured during building

    - #### buildFeedEntries

          protected abstract List<com.sun.syndication.feed.atom.Entry> buildFeedEntries(Map<String,Object> model,
                                                                   HttpServletRequest request,
                                                                   HttpServletResponse response)
                                                                                 throws Exception

      Subclasses must implement this method to build feed entries, given the model.

      Note that the passed-in HTTP response is just supposed to be used for setting cookies or other HTTP headers. The built feed itself will automatically get written to the response after this method returns.

      Parameters:
        `model` - the model Map
        `request` - in case we need locale etc. Shouldn't look at attributes.
        `response` - in case we need to set cookies. Shouldn't write to it.
      Returns:
        the feed entries to be added to the feed
      Throws:
        `Exception` - any exception that occured during document building
      See Also:
        `Entry`