org.springframework.web.servlet.view.feed
Class AbstractFeedView<T extends com.sun.syndication.feed.WireFeed>

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<T>

All Implemented Interfaces:

BeanNameAware, ApplicationContextAware, ServletContextAware, View

Direct Known Subclasses:

AbstractAtomFeedView, AbstractRssFeedView

public abstract class AbstractFeedView<T extends com.sun.syndication.feed.WireFeed>
extends AbstractView

Abstract base class for Atom and RSS Feed views, using java.net's ROME package.

Application-specific view classes will typically extend from either AbstractRssFeedView or AbstractAtomFeedView instead of from this class.

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

Since:

3.0

Author:

Arjen Poutsma, Juergen Hoeller

See Also:

AbstractRssFeedView, AbstractAtomFeedView

Field Summary

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

RESPONSE_STATUS_ATTRIBUTE

Constructor Summary

AbstractFeedView()

Method Summary

protected abstract void	buildFeedEntries(Map<String,Object> model, T feed, HttpServletRequest request, HttpServletResponse response) Subclasses must implement this method to build feed entries, given the model.
protected void	buildFeedMetadata(Map<String,Object> model, T feed, HttpServletRequest request) Populate the feed metadata (title, link, description, etc.).
protected abstract T	newFeed() Create a new feed to hold the entries.
protected void	renderMergedOutputModel(Map<String,Object> model, HttpServletRequest request, HttpServletResponse response) Subclasses must implement this method to actually render the view.

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

addStaticAttribute, createRequestContext, createTemporaryOutputStream, exposeModelAsRequestAttributes, generatesDownloadContent, getAttributesMap, getBeanName, getContentType, getRequestContextAttribute, getStaticAttributes, prepareResponse, render, setAttributes, setAttributesCSV, setAttributesMap, setBeanName, setContentType, setRequestContextAttribute, 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

Constructor Detail

AbstractFeedView

public AbstractFeedView()

Method Detail

renderMergedOutputModel

protected final void renderMergedOutputModel(Map<String,Object> model,
                                             HttpServletRequest request,
                                             HttpServletResponse response)
                                      throws Exception

Description copied from class: AbstractView

Subclasses must implement this method to actually render the view.

The first step will be preparing the request: In the JSP case, this would mean setting model objects as request attributes. The second step will be the actual rendering of the view, for example including the JSP via a RequestDispatcher.

Specified by:

renderMergedOutputModel in class AbstractView

Parameters:

model - combined output Map (never null), with dynamic values taking precedence over static attributes

request - current HTTP request

response - current HTTP response

Throws:

Exception - if rendering failed

newFeed

protected abstract T newFeed()

Create a new feed to hold the entries.

Returns:

the newly created Feed instance

buildFeedMetadata

protected void buildFeedMetadata(Map<String,Object> model,
                                 T feed,
                                 HttpServletRequest request)

Populate the feed metadata (title, link, description, etc.).

Default is an empty implementation. Subclasses can override this method to add meta fields such as title, link description, etc.

Parameters:

model - the model, in case meta information must be populated from it

feed - the feed being populated

request - in case we need locale etc. Shouldn't look at attributes.

buildFeedEntries

protected abstract void buildFeedEntries(Map<String,Object> model,
                                         T feed,
                                         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

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