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// plasmaURL.java
// -----------------------
// part of YaCy
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2004
// last major change: 09.08.2004
//
// 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
//
// Using this software in any meaning (reading, learning, copying, compiling,
// running) means that you agree that the Author(s) is (are) not responsible
// for cost, loss of data or any harm that may be caused directly or indirectly
// by usage of this softare or this documentation. The usage of this software
// is on your own risk. The installation and usage (starting/running) of this
// software may allow other people or application to access your computer and
// any attached devices and is highly dependent on the configuration of the
// software which must be done by the user of the software; the author(s) is
// (are) also not responsible for proper configuration and usage of the
// software, even if provoked by documentation provided together with
// the software.
//
// Any changes to this file according to the GPL as documented in the file
// gpl.txt aside this file in the shipment you received can be done to the
// lines that follows this copyright notice here, but changes must not be
// done inside the copyright notive above. A re-distribution must contain
// the intact and unchanged copyright notice.
// Contributions and changes to the program code must be marked as such.
package de.anomic.plasma;
import java.io.*;
import java.net.*;
import java.util.*;
import java.text.*;
import de.anomic.kelondro.*;
import de.anomic.server.*;
import de.anomic.yacy.*;
import de.anomic.htmlFilter.*;
public class plasmaURL {
// day formatter for entry export
protected static SimpleDateFormat shortDayFormatter = new SimpleDateFormat("yyyyMMdd");
// statics for value lengths
public static final int urlHashLength = yacySeedDB.commonHashLength; // 12
public static final int urlStringLength = 256;// not too short for links without parameters
public static final int urlDescrLength = 80; // The headline of a web page (meta-tag or <h1>)
public static final int urlNameLength = 40; // the tag content between <a> and </a>
public static final int urlErrorLength = 20; // a reason description for unavailable urls
public static final int urlDateLength = 4; // any date, shortened
public static final int urlCopyCountLength = 2; // counter for numbers of copies of this index
public static final int urlFlagLength = 2; // any stuff
public static final int urlQualityLength = 3; // taken from heuristic
public static final int urlLanguageLength = 2; // taken from TLD suffix as quick-hack
public static final int urlDoctypeLength = 1; // taken from extension
public static final int urlSizeLength = 6; // the source size, from cache
public static final int urlWordCountLength = 3; // the number of words, from condenser
public static final int urlCrawlProfileHandleLength = 4; // name of the prefetch profile
public static final int urlCrawlDepthLength = 2; // prefetch depth, first is '0'
public static final int urlParentBranchesLength = 3; // number of anchors of the parent
public static final int urlForkFactorLength = 4; // sum of anchors of all ancestors
public static final int urlRetryLength = 2; // number of load retries
public static final int urlHostLength = 8; // the host as struncated name
public static final int urlHandleLength = 4; // a handle
public static String dummyHash;
static {
dummyHash = "";
for (int i = 0; i < urlHashLength; i++) dummyHash += "-";
}
// the class object
protected kelondroTree urlHashCache;
private HashSet existsIndex;
public plasmaURL() throws IOException {
urlHashCache = null;
existsIndex = new HashSet();
}
public int size() {
return urlHashCache.size();
}
public void close() throws IOException {
urlHashCache.close();
}
public boolean exists(String urlHash) {
if (existsIndex.contains(urlHash)) return true;
try {
if (urlHashCache.get(urlHash.getBytes()) != null) {
existsIndex.add(urlHash);
return true;
} else {
return false;
}
} catch (IOException e) {
return false;
}
}
public void remove(String urlHash) {
try {
existsIndex.remove(urlHash);
urlHashCache.remove(urlHash.getBytes());
} catch (IOException e) {}
}
public static String urlHash(URL url) {
if (url == null) return null;
String hash = serverCodings.encodeMD5B64(htmlFilterContentScraper.urlNormalform(url), true).substring(0, urlHashLength);
return hash;
}
public static String urlHash(String url) {
if ((url == null) || (url.length() < 10)) return null;
String hash = serverCodings.encodeMD5B64(htmlFilterContentScraper.urlNormalform(url), true).substring(0, urlHashLength);
return hash;
}
public Iterator urlHashes(String urlHash, boolean up) throws IOException {
return urlHashCache.rows(up, false, urlHash.getBytes());
}
protected static Properties s2p(String s) {
Properties p = new Properties();
int pos;
StringTokenizer st = new StringTokenizer(s, ",");
String token;
while (st.hasMoreTokens()) {
token = st.nextToken().trim();
pos = token.indexOf("=");
if (pos > 0) p.setProperty(token.substring(0, pos).trim(), token.substring(pos + 1).trim());
}
return p;
}
}
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