You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
99 lines
3.9 KiB
99 lines
3.9 KiB
// ReferenceIterator.java
|
|
// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
|
|
// first published 30.03.2008 on http://yacy.net
|
|
//
|
|
// This is a part of YaCy, a peer-to-peer based web search engine
|
|
//
|
|
// $LastChangedDate$
|
|
// $LastChangedRevision$
|
|
// $LastChangedBy$
|
|
//
|
|
// LICENSE
|
|
//
|
|
// This program is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 2 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
package net.yacy.kelondro.rwi;
|
|
|
|
import java.io.File;
|
|
import java.io.IOException;
|
|
import java.util.Map;
|
|
|
|
import net.yacy.kelondro.blob.HeapReader;
|
|
import net.yacy.kelondro.index.RowSet;
|
|
import net.yacy.kelondro.index.RowSpaceExceededException;
|
|
import net.yacy.kelondro.logging.Log;
|
|
import net.yacy.kelondro.order.CloneableIterator;
|
|
import net.yacy.kelondro.util.LookAheadIterator;
|
|
|
|
/**
|
|
* iterator of BLOBHeap files: is used to import heap dumps into a write-enabled index heap
|
|
*/
|
|
public class ReferenceIterator <ReferenceType extends Reference> extends LookAheadIterator<ReferenceContainer<ReferenceType>> implements CloneableIterator<ReferenceContainer<ReferenceType>>, Iterable<ReferenceContainer<ReferenceType>> {
|
|
HeapReader.entries blobs;
|
|
File blobFile;
|
|
ReferenceFactory<ReferenceType> factory;
|
|
|
|
public ReferenceIterator(final File blobFile, final ReferenceFactory<ReferenceType> factory) throws IOException {
|
|
this.blobs = new HeapReader.entries(blobFile, factory.getRow().primaryKeyLength);
|
|
this.blobFile = blobFile;
|
|
this.factory = factory;
|
|
}
|
|
|
|
/**
|
|
* return an index container
|
|
* because they may get very large, it is wise to deallocate some memory before calling next()
|
|
*/
|
|
public ReferenceContainer<ReferenceType> next0() {
|
|
if (this.blobs == null) return null;
|
|
RowSet row;
|
|
Map.Entry<byte[], byte[]> entry;
|
|
while (this.blobs.hasNext()) {
|
|
entry = this.blobs.next();
|
|
if (entry == null) break;
|
|
try {
|
|
row = RowSet.importRowSet(entry.getValue(), this.factory.getRow());
|
|
if (row == null) {
|
|
Log.logSevere("ReferenceIterator", "lost entry '" + entry.getKey() + "' because importRowSet returned null");
|
|
continue; // thats a fail but not as REALLY bad if the whole method would crash here
|
|
}
|
|
return new ReferenceContainer<ReferenceType>(this.factory, entry.getKey(), row);
|
|
} catch (final RowSpaceExceededException e) {
|
|
Log.logSevere("ReferenceIterator", "lost entry '" + entry.getKey() + "' because of too low memory: " + e.toString());
|
|
continue;
|
|
} catch (final Throwable e) {
|
|
Log.logSevere("ReferenceIterator", "lost entry '" + entry.getKey() + "' because of too error: " + e.toString());
|
|
continue;
|
|
}
|
|
}
|
|
close();
|
|
return null;
|
|
}
|
|
|
|
public void close() {
|
|
if (this.blobs != null) this.blobs.close();
|
|
this.blobs = null;
|
|
}
|
|
|
|
public CloneableIterator<ReferenceContainer<ReferenceType>> clone(final Object modifier) {
|
|
if (this.blobs != null) this.blobs.close();
|
|
this.blobs = null;
|
|
try {
|
|
return new ReferenceIterator<ReferenceType>(this.blobFile, this.factory);
|
|
} catch (final IOException e) {
|
|
Log.logException(e);
|
|
return null;
|
|
}
|
|
}
|
|
} |