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package net.sf.flock.impl;
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import java.net.URL;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import net.sf.flock.FeedFactoryI;
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import net.sf.flock.FeedI;
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import net.sf.flock.FilterI;
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import net.sf.flock.FlockResourceException;
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import net.sf.flock.SubscriptionI;
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import net.sf.flock.SubscriptionInfoI;
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import net.sf.flock.support.AbstractSubscriptionManager;
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import org.apache.log4j.LogManager;
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import org.apache.log4j.Logger;
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/**
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* @version $Revision: 1.4 $
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* @author $Author: phraktle $
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*/
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public class SimpleSubscriptionManager extends AbstractSubscriptionManager implements FeedFactoryI {
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private final static Logger LOGGER = LogManager.getLogger(SimpleSubscriptionManager.class);
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/** Subscriptions hashed by location */
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private final Map subscriptions = new HashMap();
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public FeedI createFeed(SubscriptionInfoI subscriptionInfoI) {
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return new Feed(subscriptionInfoI);
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}
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protected synchronized void addSubscription(SubscriptionI subscription) throws FlockResourceException {
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if ( this.subscriptions.containsKey(subscription.getLocation()) ) {
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throw new FlockResourceException("Feed "+subscription.getLocation()+" already exists in store");
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}
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this.subscriptions.put(subscription.getLocation(), subscription);
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}
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public SubscriptionI getSubscription(URL location) throws FlockResourceException {
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return (SubscriptionI)this.subscriptions.get(location);
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}
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protected Collection getSubscriptions() {
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return Collections.unmodifiableCollection(this.subscriptions.values());
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}
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public Collection getSubscriptionInfos() throws FlockResourceException {
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return this.getSubscriptions();
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}
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public void unsubscribe(URL location) throws FlockResourceException {
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if (this.subscriptions.remove(location)==null) {
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throw new FlockResourceException("No subscription for location "+location);
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}
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}
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public void refresh(URL location) throws FlockResourceException {
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Subscription subscription = (Subscription)this.subscriptions.get(location);
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if ( subscription==null ) {
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throw new FlockResourceException("No subscription for location "+location);
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}
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this.refresh(subscription);
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}
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public Collection findItems(FilterI[] filters) throws FlockResourceException {
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List items = new ArrayList();
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for (Iterator i=this.getSubscriptions().iterator(); i.hasNext();) {
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SubscriptionI subscription = (SubscriptionI) i.next();
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items.addAll( subscription.getFeed().getItems() );
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}
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for (int i=0; i<filters.length; i++) {
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items = filters[i].filter(items);
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}
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return items;
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}
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/**
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* @see net.sf.flock.support.AbstractSubscriptionManager#createSubscription(net.sf.flock.SubscriptionInfoI)
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*/
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protected SubscriptionI createSubscription(SubscriptionInfoI subscriptionInfo) throws FlockResourceException {
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return new Subscription(subscriptionInfo.getLocation(), subscriptionInfo.getMetaData());
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}
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/**
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* @see net.sf.flock.SubscriptionManagerI#subscribe(net.sf.flock.SubscriptionInfoI, boolean)
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*/
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public SubscriptionI[] subscribe(SubscriptionInfoI subscriptionInfo, boolean load) throws FlockResourceException {
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SubscriptionI[] subs = super.subscribe(subscriptionInfo, load);
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for (int i=0; i<subs.length; i++){
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this.addSubscription(subs[i]);
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}
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return subs;
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}
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/**
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* @see net.sf.flock.support.AbstractSubscriptionManager#getFeedFactory()
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*/
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protected FeedFactoryI getFeedFactory() {
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return this;
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}
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}
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