mirror of
https://github.com/yacy/yacy_search_server.git
synced 2024-09-19 00:01:41 +02:00
3b40b98256
*) minor changes git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@7567 6c8d7289-2bf4-0310-a012-ef5d649a1542
118 lines
3.5 KiB
Java
118 lines
3.5 KiB
Java
// Gap.java
|
|
// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
|
|
// first published 30.12.2008 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.blob;
|
|
|
|
import java.io.BufferedInputStream;
|
|
import java.io.BufferedOutputStream;
|
|
import java.io.DataInputStream;
|
|
import java.io.DataOutputStream;
|
|
import java.io.File;
|
|
import java.io.FileInputStream;
|
|
import java.io.FileOutputStream;
|
|
import java.io.IOException;
|
|
import java.util.Iterator;
|
|
import java.util.Map;
|
|
import java.util.TreeMap;
|
|
|
|
/**
|
|
* this is an extension of a set of {seek, size} pairs
|
|
* it is used to denote the position and space of free records
|
|
* The class provides methods to dump such a set to a file and read it again
|
|
*/
|
|
|
|
public class Gap extends TreeMap<Long, Integer> {
|
|
|
|
private static final long serialVersionUID = 1L;
|
|
|
|
public Gap() {
|
|
super();
|
|
}
|
|
|
|
/**
|
|
* initialize a kelondroBLOBGap with the content of a dump
|
|
* @param file
|
|
* @throws IOException
|
|
* @throws IOException
|
|
*/
|
|
public Gap(final File file) throws IOException {
|
|
super();
|
|
// read the index dump and fill the index
|
|
DataInputStream is;
|
|
try {
|
|
is = new DataInputStream(new BufferedInputStream(new FileInputStream(file), 1024 * 1024));
|
|
} catch (OutOfMemoryError e) {
|
|
is = new DataInputStream(new FileInputStream(file));
|
|
}
|
|
long p;
|
|
int l;
|
|
while (true) {
|
|
try {
|
|
p = is.readLong();
|
|
l = is.readInt();
|
|
this.put(Long.valueOf(p), Integer.valueOf(l));
|
|
} catch (IOException e) {
|
|
break;
|
|
}
|
|
}
|
|
is.close();
|
|
is = null;
|
|
}
|
|
|
|
/**
|
|
* dump the set to a file
|
|
* @param file
|
|
* @return
|
|
* @throws IOException
|
|
*/
|
|
public int dump(File file) throws IOException {
|
|
File tmp = new File(file.getParentFile(), file.getName() + ".prt");
|
|
Iterator<Map.Entry<Long, Integer>> i = this.entrySet().iterator();
|
|
DataOutputStream os;
|
|
try {
|
|
os = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(tmp), 4 * 1024 * 1024));
|
|
} catch (OutOfMemoryError e) {
|
|
os = new DataOutputStream(new FileOutputStream(tmp));
|
|
}
|
|
int c = 0;
|
|
Map.Entry<Long, Integer> e;
|
|
while (i.hasNext()) {
|
|
e = i.next();
|
|
os.writeLong(e.getKey().longValue());
|
|
os.writeInt(e.getValue().intValue());
|
|
c++;
|
|
}
|
|
os.flush();
|
|
os.close();
|
|
tmp.renameTo(file);
|
|
assert file.exists() : file.toString();
|
|
assert !tmp.exists() : tmp.toString();
|
|
|
|
return c;
|
|
}
|
|
|
|
}
|