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82 lines
3.5 KiB
82 lines
3.5 KiB
// AbstractIndex.java
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// -----------------------------
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// (C) 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 15.3.2009 on http://yacy.net
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.kelondro.text;
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import java.io.IOException;
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import java.util.Iterator;
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import java.util.Set;
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import java.util.TreeSet;
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import de.anomic.kelondro.order.Order;
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public abstract class AbstractIndex implements Index {
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public int remove(final Set<String> wordHashes, final String urlHash) throws IOException {
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// remove the same url hashes for multiple words
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// this is mainly used when correcting a index after a search
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final Iterator<String> i = wordHashes.iterator();
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int c = 0;
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while (i.hasNext()) {
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if (remove(i.next(), urlHash)) c++;
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}
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return c;
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}
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public void remove(final Set<String> wordHashes, final Set<String> urlHashes) throws IOException {
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// remove the same url hashes for multiple words
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// this is mainly used when correcting a index after a search
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final Iterator<String> i = wordHashes.iterator();
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while (i.hasNext()) {
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remove(i.next(), urlHashes);
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}
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}
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public synchronized TreeSet<ReferenceContainer> references(final String startHash, final boolean rot, int count) throws IOException {
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// creates a set of indexContainers
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// this does not use the cache
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final Order<ReferenceContainer> containerOrder = new ReferenceContainerOrder(this.ordering().clone());
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containerOrder.rotate(ReferenceContainer.emptyContainer(startHash, 0));
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final TreeSet<ReferenceContainer> containers = new TreeSet<ReferenceContainer>(containerOrder);
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final Iterator<ReferenceContainer> i = references(startHash, rot);
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//if (ram) count = Math.min(size(), count);
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ReferenceContainer container;
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// this loop does not terminate using the i.hasNex() predicate when rot == true
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// because then the underlying iterator is a rotating iterator without termination
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// in this case a termination must be ensured with a counter
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// It must also be ensured that the counter is in/decreased every loop
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while ((count > 0) && (i.hasNext())) {
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container = i.next();
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if ((container != null) && (container.size() > 0)) {
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containers.add(container);
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}
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count--; // decrease counter even if the container was null or empty to ensure termination
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}
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return containers; // this may return less containers as demanded
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}
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}
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