mirror of
https://github.com/yacy/yacy_search_server.git
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b946e28e61
git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@1460 6c8d7289-2bf4-0310-a012-ef5d649a1542
372 lines
20 KiB
Java
372 lines
20 KiB
Java
// plasmaIndexEntry.java
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// -----------------------
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// part of YaCy
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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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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// 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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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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/*
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This class defines the structures of an index entry
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*/
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package de.anomic.plasma;
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import java.net.URL;
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import java.util.Properties;
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import de.anomic.htmlFilter.htmlFilterContentScraper;
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import de.anomic.kelondro.kelondroBase64Order;
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import de.anomic.server.serverCodings;
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import de.anomic.yacy.yacySeedDB;
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// import de.anomic.server.logging.serverLog;
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public final class plasmaWordIndexEntry {
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// an wordEntry can be filled in either of two ways:
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// by the discrete values of the entry
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// or by the encoded entry-string
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// the size of a word hash
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public static final int wordHashLength = yacySeedDB.commonHashLength; // 12
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public static final int urlHashLength = yacySeedDB.commonHashLength; // 12
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// the size of the index entry attributes
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public static final int attrSpace = 24;
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// the associated hash
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private final String urlHash;
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// discrete values
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private int hitcount; // number of this words in file
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private int wordcount; // number of all words in the file
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private int phrasecount; // number of all phrases in the file
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private int posintext; // first position of the word in text as number of word; 0=unknown or irrelevant position
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private int posinphrase; // position within a phrase of the word
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private int posofphrase; // position of the phrase in the text as count of sentences; 0=unknown; 1=path; 2=keywords; 3=headline; >4: in text
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private int worddistance;// distance between the words, only used if the index is artificial (from a conjunction)
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private long lastModified;// calculated by using last-modified
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private int quality; // result of a heuristic on the source file
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private byte[] language; // essentially the country code (the TLD as heuristic), two letters lowercase only
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private char doctype; // type of source
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private char localflag; // indicates if the index was created locally
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// doctypes:
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public static final char DT_PDFPS = 'p';
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public static final char DT_TEXT = 't';
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public static final char DT_HTML = 'h';
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public static final char DT_DOC = 'd';
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public static final char DT_IMAGE = 'i';
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public static final char DT_MOVIE = 'm';
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public static final char DT_FLASH = 'f';
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public static final char DT_SHARE = 's';
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public static final char DT_AUDIO = 'a';
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public static final char DT_BINARY = 'b';
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public static final char DT_UNKNOWN = 'u';
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// appearance locations: (used for flags)
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public static final int AP_TITLE = 0; // title tag from html header
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public static final int AP_H1 = 1; // h1-tag
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public static final int AP_H2 = 2; // h2-tag
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public static final int AP_H3 = 3; // h3-tag
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public static final int AP_H4 = 4; // h4-tag
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public static final int AP_H5 = 5; // h5-tag
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public static final int AP_H6 = 6; // h6-tag
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public static final int AP_TEXT = 7; // word appears in text (used to check validation of other appearances against spam)
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public static final int AP_URL = 8; // word inside an url
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public static final int AP_IMG = 9; // tag inside image references
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public static final int AP_TAG = 10; // for tagged indexeing (i.e. using mp3 tags)
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public static final int AP_ANCHOR = 11; // anchor description
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// URL attributes
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public static final int UA_LOCAL = 0; // URL was crawled locally
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public static final int UA_TILDE = 1; // tilde appears in URL
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public static final int UA_REDIRECT = 2; // The URL is a redirection
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// local flag attributes
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public static final char LT_LOCAL = 'L';
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public static final char LT_GLOBAL = 'G';
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// create a word hash
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public static String word2hash(String word) {
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return kelondroBase64Order.enhancedCoder.encode(serverCodings.encodeMD5Raw(word.toLowerCase())).substring(0, wordHashLength);
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}
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// doctype calculation
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public static char docType(URL url) {
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String path = htmlFilterContentScraper.urlNormalform(url);
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// serverLog.logFinest("PLASMA", "docType URL=" + path);
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char doctype = doctype = DT_UNKNOWN;
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if (path.endsWith(".gif")) { doctype = DT_IMAGE; }
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else if (path.endsWith(".jpg")) { doctype = DT_IMAGE; }
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else if (path.endsWith(".jpeg")) { doctype = DT_IMAGE; }
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else if (path.endsWith(".png")) { doctype = DT_IMAGE; }
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else if (path.endsWith(".html")) { doctype = DT_HTML; }
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else if (path.endsWith(".txt")) { doctype = DT_TEXT; }
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else if (path.endsWith(".doc")) { doctype = DT_DOC; }
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else if (path.endsWith(".rtf")) { doctype = DT_DOC; }
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else if (path.endsWith(".pdf")) { doctype = DT_PDFPS; }
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else if (path.endsWith(".ps")) { doctype = DT_PDFPS; }
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else if (path.endsWith(".avi")) { doctype = DT_MOVIE; }
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else if (path.endsWith(".mov")) { doctype = DT_MOVIE; }
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else if (path.endsWith(".qt")) { doctype = DT_MOVIE; }
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else if (path.endsWith(".mpg")) { doctype = DT_MOVIE; }
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else if (path.endsWith(".md5")) { doctype = DT_SHARE; }
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else if (path.endsWith(".mpeg")) { doctype = DT_MOVIE; }
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else if (path.endsWith(".asf")) { doctype = DT_FLASH; }
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return doctype;
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}
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public static char docType(String mime) {
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// serverLog.logFinest("PLASMA", "docType mime=" + mime);
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char doctype = DT_UNKNOWN;
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if (mime == null) doctype = DT_UNKNOWN;
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else if (mime.startsWith("image/")) doctype = DT_IMAGE;
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/* else if (mime.endsWith("/gif")) doctype = DT_IMAGE;
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else if (mime.endsWith("/jpeg")) doctype = DT_IMAGE;
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else if (mime.endsWith("/png")) doctype = DT_IMAGE; */
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else if (mime.endsWith("/html")) doctype = DT_HTML;
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else if (mime.endsWith("/rtf")) doctype = DT_DOC;
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else if (mime.endsWith("/pdf")) doctype = DT_PDFPS;
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else if (mime.endsWith("/octet-stream")) doctype = DT_BINARY;
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else if (mime.endsWith("/x-shockwave-flash")) doctype = DT_FLASH;
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else if (mime.endsWith("/msword")) doctype = DT_DOC;
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else if (mime.endsWith("/mspowerpoint")) doctype = DT_DOC;
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else if (mime.endsWith("/postscript")) doctype = DT_PDFPS;
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else if (mime.startsWith("text/")) doctype = DT_TEXT;
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// else if (mime.startsWith("image/")) doctype = DT_IMAGE;
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else if (mime.startsWith("audio/")) doctype = DT_AUDIO;
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else if (mime.startsWith("video/")) doctype = DT_MOVIE;
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//bz2 = application/x-bzip2
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//dvi = application/x-dvi
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//gz = application/gzip
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//hqx = application/mac-binhex40
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//lha = application/x-lzh
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//lzh = application/x-lzh
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//pac = application/x-ns-proxy-autoconfig
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//php = application/x-httpd-php
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//phtml = application/x-httpd-php
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//rss = application/xml
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//tar = application/tar
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//tex = application/x-tex
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//tgz = application/tar
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//torrent = application/x-bittorrent
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//xhtml = application/xhtml+xml
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//xla = application/msexcel
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//xls = application/msexcel
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//xsl = application/xml
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//xml = application/xml
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//Z = application/x-compress
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//zip = application/zip
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return doctype;
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}
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// language calculation
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public static String language(URL url) {
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String language = "uk";
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String host = url.getHost();
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int pos = host.lastIndexOf(".");
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if ((pos > 0) && (host.length() - pos == 3)) language = host.substring(pos + 1).toLowerCase();
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return language;
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}
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// the class instantiation can only be done by a plasmaStore method
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// therefore they are all public
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public plasmaWordIndexEntry(String urlHash,
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int hitcount, //*how often appears this word in the text
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int wordcount, //*total number of words
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int phrasecount, //*total number of phrases
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int posintext, //*position of word in all words
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int posinphrase, //*position of word in its phrase
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int posofphrase, //*number of the phrase where word appears
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int distance, //*word distance; this is 0 by default, and set to the difference of posintext from two indexes if these are combined (simultanous search). If stored, this shows that the result was obtained by remote search
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int sizeOfPage, // # of bytes of the page
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long lastmodified, //*last-modified time of the document where word appears
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long updatetime, // update time; this is needed to compute a TTL for the word, so it can be removed easily if the TTL is short
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int quality, //*the entropy value
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String language, //*(guessed) language of document
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char doctype, //*type of document
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boolean local //*flag shows that this index was generated locally; othervise its from a remote peer
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) {
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// more needed attributes:
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// - boolean: appearance attributes: title, appears in header, anchor-descr, image-tag etc
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// - boolean: URL attributes
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// - int: url-length (shorter are better)
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// - int: url-number of components / length of path
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// - int: length of description tag / title tag (longer are better)
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// - int: number of chapters
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// - int: # of outlinks to same domain
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// - int: # of outlinks to outside domain
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// - int: length of description
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// - int: length of title
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// - int: # of keywords
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if ((language == null) || (language.length() != plasmaURL.urlLanguageLength)) language = "uk";
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this.urlHash = urlHash;
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this.hitcount = hitcount;
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this.wordcount = wordcount;
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this.phrasecount = phrasecount;
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this.posintext = posintext;
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this.posinphrase = posinphrase;
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this.posofphrase = posofphrase;
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this.worddistance = distance;
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this.lastModified = lastmodified;
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this.quality = quality;
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this.language = language.getBytes();
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this.doctype = doctype;
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this.localflag = (local) ? LT_LOCAL : LT_GLOBAL;
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}
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public plasmaWordIndexEntry(String urlHash, String code) {
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// the code is not parsed but used later on
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this.urlHash = urlHash;
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this.hitcount = (int) kelondroBase64Order.enhancedCoder.decodeLong(code.substring(6, 8));
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this.lastModified = plasmaWordIndex.reverseMicroDateDays((int) kelondroBase64Order.enhancedCoder.decodeLong(code.substring(3, 6)));
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this.quality = (int) kelondroBase64Order.enhancedCoder.decodeLong(code.substring(0, 3));
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this.language = code.substring(8, 10).getBytes();
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this.doctype = code.charAt(10);
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this.localflag = code.charAt(11);
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this.posintext = (code.length() >= 14) ? (int) kelondroBase64Order.enhancedCoder.decodeLong(code.substring(12, 14)) : 0;
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this.posinphrase = (code.length() >= 15) ? (int) kelondroBase64Order.enhancedCoder.decodeLong(code.substring(14, 16)) : 0;
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this.posofphrase = (code.length() >= 17) ? (int) kelondroBase64Order.enhancedCoder.decodeLong(code.substring(16, 18)) : 0;
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this.worddistance = (code.length() >= 19) ? (int) kelondroBase64Order.enhancedCoder.decodeLong(code.substring(18, 20)) : 0;
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this.wordcount = (code.length() >= 21) ? (int) kelondroBase64Order.enhancedCoder.decodeLong(code.substring(20, 22)) : 0;
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this.phrasecount = (code.length() >= 23) ? (int) kelondroBase64Order.enhancedCoder.decodeLong(code.substring(22, 24)) : 0;
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if (hitcount == 0) hitcount = 1;
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if (wordcount == 0) wordcount = 1000;
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if (phrasecount == 0) phrasecount = 100;
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}
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public plasmaWordIndexEntry(String external) {
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// parse external form
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String[] elts = external.substring(1, external.length() - 1).split(",");
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Properties pr = new Properties();
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int p;
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for (int i = 0; i < elts.length; i++) {
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pr.put(elts[i].substring(0, (p = elts[i].indexOf("="))), elts[i].substring(p + 1));
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}
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// set values
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this.urlHash = pr.getProperty("h", "");
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this.hitcount = (int) kelondroBase64Order.enhancedCoder.decodeLong(pr.getProperty("c", "A"));
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this.wordcount = (int) kelondroBase64Order.enhancedCoder.decodeLong(pr.getProperty("w", "__"));
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this.phrasecount = (int) kelondroBase64Order.enhancedCoder.decodeLong(pr.getProperty("p", "__"));
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this.posintext = (int) kelondroBase64Order.enhancedCoder.decodeLong(pr.getProperty("t", "__"));
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this.posinphrase = (int) kelondroBase64Order.enhancedCoder.decodeLong(pr.getProperty("r", "__"));
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this.posofphrase = (int) kelondroBase64Order.enhancedCoder.decodeLong(pr.getProperty("o", "__"));
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this.worddistance = (int) kelondroBase64Order.enhancedCoder.decodeLong(pr.getProperty("i", "__"));
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this.lastModified = plasmaWordIndex.reverseMicroDateDays((int) kelondroBase64Order.enhancedCoder.decodeLong(pr.getProperty("a", "A")));
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this.quality = (int) kelondroBase64Order.enhancedCoder.decodeLong(pr.getProperty("q", "__"));
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this.language = pr.getProperty("l", "uk").getBytes();
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this.doctype = pr.getProperty("d", "u").charAt(0);
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this.localflag = pr.getProperty("f", ""+LT_LOCAL).charAt(0);
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}
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public String toEncodedForm() {
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// attention: this integrates NOT the URL hash into the encoding
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// if you need a complete dump, use toExternalForm()
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StringBuffer buf = new StringBuffer(attrSpace);
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buf.append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.quality, plasmaURL.urlQualityLength))
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.append(kelondroBase64Order.enhancedCoder.encodeLongSmart(plasmaWordIndex.microDateDays(this.lastModified), 3))
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.append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.hitcount, 2))
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.append(new String(this.language))
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.append(this.doctype)
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.append(this.localflag)
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.append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.posintext, 2))
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.append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.posinphrase, 2))
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.append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.posofphrase, 2))
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.append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.worddistance, 2))
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.append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.wordcount, 2))
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.append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.phrasecount, 2)); // 3+3+2+2+1+1+2+2+2+2+2+2= 24 bytes
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return buf.toString();
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}
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public String toExternalForm() {
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StringBuffer str = new StringBuffer(61);
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str.append("{")
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.append( "h=").append(this.urlHash)
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.append(",q=").append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.quality, plasmaURL.urlQualityLength))
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.append(",a=").append(kelondroBase64Order.enhancedCoder.encodeLongSmart(plasmaWordIndex.microDateDays(this.lastModified), 3))
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.append(",c=").append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.hitcount, 2))
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.append(",l=").append(new String(this.language))
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.append(",d=").append(this.doctype)
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.append(",f=").append(this.localflag)
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.append(",t=").append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.posintext, 2))
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.append(",r=").append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.posinphrase, 2))
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.append(",o=").append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.posofphrase, 2))
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.append(",i=").append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.worddistance, 2))
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.append(",w=").append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.wordcount, 2))
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.append(",p=").append(kelondroBase64Order.enhancedCoder.encodeLongSmart(this.phrasecount, 2))
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.append("}");
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return str.toString();
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}
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public void combineDistance(plasmaWordIndexEntry oe) {
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this.worddistance = this.worddistance + oe.worddistance + Math.abs(this.posintext - oe.posintext);
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this.posintext = Math.min(this.posintext, oe.posintext);
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if (this.posofphrase != oe.posofphrase) this.posinphrase = 0; // (unknown)
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this.posofphrase = Math.min(this.posofphrase, oe.posofphrase);
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this.wordcount = (this.wordcount + oe.wordcount) / 2;
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}
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public String getUrlHash() { return urlHash; }
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public int getQuality() { return quality; }
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public int getVirtualAge() { return plasmaWordIndex.microDateDays(lastModified); }
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public long getLastModified() { return lastModified; }
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public int hitcount() { return hitcount; }
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public int posintext() { return posintext; }
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public int posinphrase() { return posinphrase; }
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public int posofphrase() { return posofphrase; }
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public int worddistance() { return worddistance; }
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public int wordcount() { return wordcount; }
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public int phrasecount() { return phrasecount; }
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public String getLanguage() { return new String(language); }
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public char getType() { return doctype; }
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public boolean isLocal() { return localflag == LT_LOCAL; }
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public static void main(String[] args) {
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// outputs the word hash to a given word
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if (args.length != 1) System.exit(0);
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System.out.println("WORDHASH: " + word2hash(args[0]));
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}
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} |