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package de.danoeh.antennapod.util;
import de.danoeh.antennapod.feed.FeedItem;
import java.util.Iterator;
import java.util.List;
/**
* Provides methods for accessing the queue. It is possible to load only a part of the information about the queue that
* is stored in the database (e.g. sometimes the user just has to test if a specific item is contained in the List.
* QueueAccess provides an interface for accessing the queue without having to care about the type of the queue
* representation.
*/
public abstract class QueueAccess {
/**
* Returns true if the item is in the queue, false otherwise.
*/
public abstract boolean contains(long id);
/**
* Removes the item from the queue.
*
* @return true if the queue was modified by this operation.
*/
public abstract boolean remove(long id);
private QueueAccess() {
}
public static QueueAccess IDListAccess(final List<Long> ids) {
return new QueueAccess() {
@Override
public boolean contains(long id) {
return (ids != null) && ids.contains(id);
}
@Override
public boolean remove(long id) {
return ids.remove(id);
}
};
}
public static QueueAccess ItemListAccess(final List<FeedItem> items) {
return new QueueAccess() {
@Override
public boolean contains(long id) {
Iterator<FeedItem> it = items.iterator();
for (FeedItem i = it.next(); it.hasNext(); i = it.next()) {
if (i.getId() == id) {
return true;
}
}
return false;
}
@Override
public boolean remove(long id) {
Iterator<FeedItem> it = items.iterator();
for (FeedItem i = it.next(); it.hasNext(); i = it.next()) {
if (i.getId() == id) {
it.remove();
return true;
}
}
return false;
}
};
}
public static QueueAccess NotInQueueAccess() {
return new QueueAccess() {
@Override
public boolean contains(long id) {
return false;
}
@Override
public boolean remove(long id) {
return false;
}
};
}
}
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