dekoh.portal.syndication.aggregator.core
Class FeedFetcherCacheWrapper

java.lang.Object
  dekoh.portal.syndication.aggregator.core.FeedFetcherCacheWrapper

All Implemented Interfaces:

com.sun.syndication.fetcher.impl.FeedFetcherCache

public class FeedFetcherCacheWrapper
extends Object
implements com.sun.syndication.fetcher.impl.FeedFetcherCache

FeedFetcherCacheWrapper is a wrapper over rome's FeedFetcherCache. This has additional utility methods to retrieve a subscription item and to detect if the feed in this cache is modified.

Since:

Oct 24, 2007

Constructor Summary

FeedFetcherCacheWrapper(com.sun.syndication.fetcher.impl.FeedFetcherCache feedFetcherCache)

Method Summary

com.sun.syndication.fetcher.impl.SyndFeedInfo	getFeedInfo(URL url)
boolean	isCachedCopyOlder(com.sun.syndication.fetcher.impl.SyndFeedInfo synFeedInfo) COmpares the cached feed with the supplied feed based on lastModifiedTime and Etag.
boolean	retrieve(SubscriptionItem subscriptionItem) Retrievs the SyndFeed represented by the subscription item and updates the cache
void	setFeedInfo(URL url, com.sun.syndication.fetcher.impl.SyndFeedInfo syndFeedInfo)

Methods inherited from class java.lang.Object

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

Constructor Detail

FeedFetcherCacheWrapper

public FeedFetcherCacheWrapper(com.sun.syndication.fetcher.impl.FeedFetcherCache feedFetcherCache)

Method Detail

getFeedInfo

public com.sun.syndication.fetcher.impl.SyndFeedInfo getFeedInfo(URL url)

Specified by:

getFeedInfo in interface com.sun.syndication.fetcher.impl.FeedFetcherCache

setFeedInfo

public void setFeedInfo(URL url,
                        com.sun.syndication.fetcher.impl.SyndFeedInfo syndFeedInfo)

Specified by:

setFeedInfo in interface com.sun.syndication.fetcher.impl.FeedFetcherCache

retrieve

public boolean retrieve(SubscriptionItem subscriptionItem)
                 throws com.sun.syndication.fetcher.FetcherException,
                        IOException,
                        FeedException

Retrievs the SyndFeed represented by the subscription item and updates the cache

Parameters:

subscriptionItem - SubscriptionItem which will be downloaded

Returns:

true , if call to this method has modified the previously cached copy.
false, if the cached copy is not updated, this will happen when server hosting the feed sends 304

Throws:

IOException

com.sun.syndication.fetcher.FetcherException

FeedException

isCachedCopyOlder

public boolean isCachedCopyOlder(com.sun.syndication.fetcher.impl.SyndFeedInfo synFeedInfo)

COmpares the cached feed with the supplied feed based on lastModifiedTime and Etag. lastModifiedTime is given a priority over etag

Parameters:

synFeedInfo -

Returns:

true, if the cached dies not have the supplied synFeedInfo or if cached feed copy is older than synFeedInfo