/*
* Copyright (c) 2004 Ragnarok
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package net.i2p.addressbook;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import net.i2p.I2PAppContext;
import net.i2p.client.naming.HostTxtEntry;
import net.i2p.util.PortMapper;
/**
* An iterator over the subscriptions in a SubscriptionList. Note that this iterator
* returns AddressBook objects, and not Subscription objects.
* Yes, the EepGet fetch() is done in here in next().
*
* @author Ragnarok
*/
class SubscriptionIterator implements Iterator<AddressBook> {
private final Iterator<Subscription> subIterator;
private final String proxyHost;
private final int proxyPort;
private final long delay;
/**
* Construct a SubscriptionIterator using the Subscriprions in List subscriptions.
*
* @param subscriptions
* List of Subscription objects that represent address books.
* @param delay the minimum delay since last fetched for the iterator to actually fetch
* @param proxyHost proxy hostname
* @param proxyPort proxt port number
*/
public SubscriptionIterator(List<Subscription> subscriptions, long delay, String proxyHost, int proxyPort) {
this.subIterator = subscriptions.iterator();
this.delay = delay;
this.proxyHost = proxyHost;
this.proxyPort = proxyPort;
}
/* (non-Javadoc)
* @see java.util.Iterator#hasNext()
*/
public boolean hasNext() {
return this.subIterator.hasNext();
}
/**
* Yes, the EepGet fetch() is done in here in next().
*
* see java.util.Iterator#next()
* @return non-null AddressBook (empty if the minimum delay has not been met,
* or there is no proxy tunnel, or the fetch otherwise fails)
*/
public AddressBook next() {
Subscription sub = this.subIterator.next();
if (sub.getLocation().startsWith("file:")) {
// test only
return new AddressBook(sub.getLocation().substring(5));
} else if (sub.getLastFetched() + this.delay < I2PAppContext.getGlobalContext().clock().now() &&
I2PAppContext.getGlobalContext().portMapper().getPort(PortMapper.SVC_HTTP_PROXY) >= 0 &&
!I2PAppContext.getGlobalContext().getBooleanProperty("i2p.vmCommSystem")) {
//System.err.println("Fetching addressbook from " + sub.getLocation());
return new AddressBook(sub, this.proxyHost, this.proxyPort);
} else {
//System.err.println("Addressbook " + sub.getLocation() + " was last fetched " +
// DataHelper.formatDuration(I2PAppContext.getGlobalContext().clock().now() - sub.getLastFetched()) +
// " ago but the minimum delay is " +
// DataHelper.formatDuration(this.delay));
return new AddressBook(Collections.<String, HostTxtEntry>emptyMap());
}
}
/* (non-Javadoc)
* @see java.util.Iterator#remove()
*/
public void remove() {
throw new UnsupportedOperationException();
}
}