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243 lines
9.7 KiB
243 lines
9.7 KiB
//plasmaParserDocument.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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//
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//last major change: 24.04.2005
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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.htmlFilterContentScraper;
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import de.anomic.htmlFilter.htmlFilterImageEntry;
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import java.io.ByteArrayInputStream;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.TreeSet;
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public class plasmaParserDocument {
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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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TreeSet 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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plasmaCondenser condenser;
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boolean resorted;
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public plasmaParserDocument(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, TreeSet images) {
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this.location = location;
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this.mimeType = (mimeType==null)?"application/octet-stream":mimeType;
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this.keywords = (keywords==null)?"":keywords;
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this.shortTitle = (shortTitle==null)?"":shortTitle;
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this.longTitle = (longTitle==null)?"":longTitle;
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this.sections = (sections==null)?new String[0]:sections;
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this.abstrct = (abstrct==null)?"":abstrct;
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this.text = (text==null)?new byte[0]:text;
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this.anchors = (anchors==null)?new HashMap(0):anchors;
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this.images = (images==null)?new TreeSet():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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this.condenser = null;
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this.resorted = false;
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}
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public String getMimeType() {
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return this.mimeType;
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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 plasmaCondenser getCondenser() {
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if (condenser == null) condenser = new plasmaCondenser(new ByteArrayInputStream(getText()), 0, 0);
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return condenser;
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}
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public String[] getSentences() {
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return getCondenser().sentences();
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}
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public String getKeywords() {
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return this.keywords;
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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 TreeSet getImages() {
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// returns all links enbedded as pictures (visible in document)
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// this resturns a htmlFilterImageEntry collection
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if (!resorted) resortLinks();
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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 (!resorted) 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 (!resorted) 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 (!resorted) resortLinks();
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return emaillinks;
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}
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private synchronized void resortLinks() {
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// extract hyperlinks, medialinks and emaillinks from anchorlinks
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Iterator i;
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String url;
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int extpos, qpos;
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String ext = null;
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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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TreeSet collectedImages = new TreeSet(); // this is a set that is collected now and joined later to the imagelinks
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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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if (((qpos = url.indexOf("?")) >= 0) && (qpos > extpos)) {
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ext = url.substring(extpos, qpos).toLowerCase();
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} else {
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ext = url.substring(extpos).toLowerCase();
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}
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normal = htmlFilterContentScraper.urlNormalform(null, url);
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if (normal != null) { //TODO: extension function is not correct
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if (plasmaParser.mediaExtContains(ext.substring(1))) {
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// this is not a 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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if (plasmaParser.imageExtContains(ext.substring(1))) {
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try {
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collectedImages.add(new htmlFilterImageEntry(new URL(normal), "", -1, -1));
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} catch (MalformedURLException e) {}
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}
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}
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}
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}
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}
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// add the images to the medialinks
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i = images.iterator();
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String normal;
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htmlFilterImageEntry iEntry;
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while (i.hasNext()) {
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iEntry = (htmlFilterImageEntry) i.next();
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normal = htmlFilterContentScraper.urlNormalform(iEntry.url());
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if (normal != null) medialinks.put(normal, iEntry.alt()); // avoid NullPointerException
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}
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// expand the hyperlinks:
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// we add artificial hyperlinks to the hyperlink set
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// that can be calculated from given hyperlinks and imagelinks
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hyperlinks.putAll(plasmaParser.allReflinks(hyperlinks));
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hyperlinks.putAll(plasmaParser.allReflinks(medialinks));
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hyperlinks.putAll(plasmaParser.allSubpaths(hyperlinks));
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hyperlinks.putAll(plasmaParser.allSubpaths(medialinks));
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// finally add image links that we collected from the anchors to the image map
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i = collectedImages.iterator();
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while (i.hasNext()) {
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iEntry = (htmlFilterImageEntry) i.next();
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if (!images.contains(iEntry)) images.add(iEntry);
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}
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// don't do this again
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this.resorted = true;
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}
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}
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