git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@15 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
20 years ago
parent
e374aca2cd
commit
a87a17a3c8
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// plasmaParser.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, 2005
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// last major change: 12.04.2005
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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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package de.anomic.plasma;
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import de.anomic.htmlFilter.*;
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import java.io.*;
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import java.net.*;
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import java.util.*;
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public class plasmaParser {
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public static String mediaExt =
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"swf,wmv,jpg,jpeg,jpe,rm,mov,mpg,mpeg,mp3,asf,gif,png,avi,zip,rar," +
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"sit,hqx,img,dmg,tar,gz,ps,pdf,doc,xls,ppt,ram,bz2,arj";
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public plasmaParser(File parserDispatcherPropertyFile) {
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// this is only a dummy yet because we have only one parser...
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}
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public document parse(URL location, String mimeType, byte[] source) {
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// make a scraper and transformer
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htmlFilterContentScraper scraper = new htmlFilterContentScraper(location);
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OutputStream hfos = new htmlFilterOutputStream(null, scraper, null, false);
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try {
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hfos.write(source);
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return new document(new URL(urlNormalform(location)),
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mimeType, null, null, scraper.getHeadline(),
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null, null,
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scraper.getText(), scraper.getAnchor(), scraper.getImage());
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} catch (Exception e) {
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return null;
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}
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}
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public static String urlNormalform(URL url) {
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if (url == null) return null;
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return urlNormalform(url.toString());
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}
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public static String urlNormalform(String us) {
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if (us == null) return null;
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if (us.length() == 0) return null;
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int p;
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if ((p = us.indexOf("#")) >= 0) us = us.substring(0, p);
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if (us.endsWith(":80")) us = us.substring(0, us.length() - 3);
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if (((us.endsWith("/")) && (us.lastIndexOf('/', us.length() - 2) < 8))) us = us.substring(0, us.length() - 1);
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return us;
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}
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public class document {
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URL location; // the source url
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String mimeType; // mimeType as taken from http header
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String keywords; // most resources provide a keyword field
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String shortTitle; // a shortTitle mostly appears in the window header (border)
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String longTitle; // the real title of the document, commonly h1-tags
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String[] sections; // if present: more titles/headlines appearing in the document
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String abstrct; // an abstract, if present: short content description
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byte[] text; // the clear text, all that is visible
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Map anchors; // all links embedded as clickeable entities (anchor tags)
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Map images; // all visible pictures in document
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// the anchors and images - Maps are URL-to-EntityDescription mappings.
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// The EntityDescription appear either as visible text in anchors or as alternative
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// text in image tags.
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Map hyperlinks;
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Map medialinks;
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Map emaillinks;
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public document(URL location, String mimeType,
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String keywords, String shortTitle, String longTitle,
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String[] sections, String abstrct,
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byte[] text, Map anchors, Map images) {
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this.location = location;
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this.mimeType = mimeType;
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this.keywords = keywords;
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this.shortTitle = shortTitle;
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this.longTitle = longTitle;
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this.sections = sections;
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this.abstrct = abstrct;
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this.text = text;
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this.anchors = anchors;
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this.images = images;
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this.hyperlinks = null;
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this.medialinks = null;
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this.emaillinks = null;
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}
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private String absolutePath(String relativePath) {
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try {
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return urlNormalform(new URL(location, relativePath));
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} catch (Exception e) {
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return "";
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}
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}
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public String getMainShortTitle() {
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if (shortTitle != null) return shortTitle; else return longTitle;
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}
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public String getMainLongTitle() {
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if (longTitle != null) return longTitle; else return shortTitle;
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}
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public String[] getSectionTitles() {
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if (sections != null) return sections; else return new String[]{getMainLongTitle()};
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}
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public String getAbstract() {
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if (abstrct != null) return abstrct; else return getMainLongTitle();
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}
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public byte[] getText() {
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// returns only the clear (visible) text (not the source data)
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return text;
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}
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public Map getAnchors() {
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// returns all links embedded as anchors (clickeable entities)
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return anchors;
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}
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public Map getImages() {
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// returns all links enbedded as pictures (visible iin document)
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return images;
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}
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// the next three methods provide a calculated view on the getAnchors/getImages:
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public Map getHyperlinks() {
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// this is a subset of the getAnchor-set: only links to other hyperrefs
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if (hyperlinks == null) resortLinks();
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return hyperlinks;
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}
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public Map getMedialinks() {
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// this is partly subset of getAnchor and getImage: all non-hyperrefs
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if (medialinks == null) resortLinks();
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return medialinks;
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}
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public Map getEmaillinks() {
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// this is part of the getAnchor-set: only links to email addresses
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if (emaillinks == null) resortLinks();
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return emaillinks;
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}
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private synchronized void resortLinks() {
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Iterator i;
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String url;
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int extpos;
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String ext;
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i = anchors.entrySet().iterator();
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hyperlinks = new HashMap();
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medialinks = new HashMap();
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emaillinks = new HashMap();
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Map.Entry entry;
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while (i.hasNext()) {
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entry = (Map.Entry) i.next();
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url = (String) entry.getKey();
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if ((url != null) && (url.startsWith("mailto:"))) {
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emaillinks.put(url.substring(7), entry.getValue());
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} else {
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extpos = url.lastIndexOf(".");
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String normal;
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if (extpos > 0) {
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ext = url.substring(extpos).toLowerCase();
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normal = urlNormalform(url);
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if (normal != null) {
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if (mediaExt.indexOf(ext.substring(1)) >= 0) {
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// this is not an normal anchor, its a media link
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medialinks.put(normal, entry.getValue());
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} else {
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hyperlinks.put(normal, entry.getValue());
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}
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}
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}
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}
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}
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// finally add the images to the medialinks
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i = images.entrySet().iterator();
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String normal;
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while (i.hasNext()) {
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entry = (Map.Entry) i.next();
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url = (String) entry.getKey();
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normal = urlNormalform(url);
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if (normal != null) medialinks.put(normal, entry.getValue()); // avoid NullPointerException
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}
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expandHyperlinks();
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}
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public synchronized void expandHyperlinks() {
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// we add artificial hyperlinks to the hyperlink set that can be calculated from
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// given hyperlinks and imagelinks
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hyperlinks.putAll(allReflinks(hyperlinks));
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hyperlinks.putAll(allReflinks(medialinks));
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hyperlinks.putAll(allSubpaths(hyperlinks));
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hyperlinks.putAll(allSubpaths(medialinks));
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}
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}
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private static Map allReflinks(Map links) {
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// we find all links that are part of a reference inside a url
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HashMap v = new HashMap();
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Iterator i = links.keySet().iterator();
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String s;
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int pos;
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loop: while (i.hasNext()) {
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s = (String) i.next();
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if ((pos = s.toLowerCase().indexOf("http://",7)) > 0) {
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i.remove();
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s = s.substring(pos);
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while ((pos = s.toLowerCase().indexOf("http://",7)) > 0) s = s.substring(pos);
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if (!(v.containsKey(s))) v.put(s, "ref");
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continue loop;
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}
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if ((pos = s.toLowerCase().indexOf("/www.",7)) > 0) {
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i.remove();
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s = "http:/" + s.substring(pos);
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while ((pos = s.toLowerCase().indexOf("/www.",7)) > 0) s = "http:/" + s.substring(pos);
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if (!(v.containsKey(s))) v.put(s, "ref");
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continue loop;
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}
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}
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return v;
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}
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private static Map allSubpaths(Map links) {
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HashMap v = new HashMap();
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Iterator i = links.keySet().iterator();
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String s;
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int pos;
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while (i.hasNext()) {
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s = (String) i.next();
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if (s.endsWith("/")) s = s.substring(0, s.length() - 1);
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pos = s.lastIndexOf("/");
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while (pos > 8) {
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s = s.substring(0, pos + 1);
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if (!(v.containsKey(s))) v.put(s, "sub");
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s = s.substring(0, pos);
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pos = s.lastIndexOf("/");
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}
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}
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return v;
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}
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}
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