mirror of
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103 lines
4.1 KiB
Java
103 lines
4.1 KiB
Java
// ReferenceIterator.java
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// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 30.03.2008 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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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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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 net.yacy.kelondro.rwi;
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import java.io.File;
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import java.io.IOException;
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import java.util.Map;
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import net.yacy.cora.document.encoding.UTF8;
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import net.yacy.cora.order.CloneableIterator;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.cora.util.LookAheadIterator;
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import net.yacy.cora.util.SpaceExceededException;
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import net.yacy.kelondro.blob.HeapReader;
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import net.yacy.kelondro.index.RowSet;
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/**
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* iterator of BLOBHeap files: is used to import heap dumps into a write-enabled index heap
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*/
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public class ReferenceIterator <ReferenceType extends Reference> extends LookAheadIterator<ReferenceContainer<ReferenceType>> implements CloneableIterator<ReferenceContainer<ReferenceType>>, Iterable<ReferenceContainer<ReferenceType>> {
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private HeapReader.entries blobs;
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private File blobFile;
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private ReferenceFactory<ReferenceType> factory;
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public ReferenceIterator(final File blobFile, final ReferenceFactory<ReferenceType> factory) throws IOException {
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this.blobs = new HeapReader.entries(blobFile, factory.getRow().primaryKeyLength);
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this.blobFile = blobFile;
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this.factory = factory;
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}
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/**
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* return an index container
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* because they may get very large, it is wise to deallocate some memory before calling next()
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*/
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@Override
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public ReferenceContainer<ReferenceType> next0() {
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if (this.blobs == null) return null;
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RowSet row;
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Map.Entry<byte[], byte[]> entry;
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while (this.blobs.hasNext()) {
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entry = this.blobs.next();
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if (entry == null) break;
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try {
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row = RowSet.importRowSet(entry.getValue(), this.factory.getRow());
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if (row == null) {
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ConcurrentLog.severe("ReferenceIterator", "lost entry '" + UTF8.String(entry.getKey()) + "' because importRowSet returned null");
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continue; // thats a fail but not as REALLY bad if the whole method would crash here
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}
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return new ReferenceContainer<ReferenceType>(this.factory, entry.getKey(), row);
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} catch (final SpaceExceededException e) {
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ConcurrentLog.severe("ReferenceIterator", "lost entry '" + UTF8.String(entry.getKey()) + "' because of too low memory: " + e.toString());
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continue;
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} catch (final Throwable e) {
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ConcurrentLog.severe("ReferenceIterator", "lost entry '" + UTF8.String(entry.getKey()) + "' because of error: " + e.toString());
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continue;
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}
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}
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close();
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return null;
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}
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@Override
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public synchronized void close() {
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if (this.blobs != null) this.blobs.close();
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this.blobs = null;
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}
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@Override
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public CloneableIterator<ReferenceContainer<ReferenceType>> clone(final Object modifier) {
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if (this.blobs != null) this.blobs.close();
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this.blobs = null;
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try {
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return new ReferenceIterator<ReferenceType>(this.blobFile, this.factory);
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} catch (final IOException e) {
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ConcurrentLog.logException(e);
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return null;
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}
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}
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} |