mirror of
https://github.com/yacy/yacy_search_server.git
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3d95981f7d
*) minor changes git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@7396 6c8d7289-2bf4-0310-a012-ef5d649a1542
275 lines
8.5 KiB
Java
275 lines
8.5 KiB
Java
// DCEntry.java
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// (C) 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 15.04.2009 on http://yacy.net
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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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// LICENSE
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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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package net.yacy.document.content;
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import java.io.IOException;
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import java.io.OutputStreamWriter;
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import java.io.UnsupportedEncodingException;
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import java.net.MalformedURLException;
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import java.text.Collator;
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import java.text.ParseException;
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import java.util.Date;
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import java.util.HashSet;
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import java.util.Locale;
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import java.util.TreeMap;
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import net.yacy.document.Document;
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import net.yacy.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.logging.Log;
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import net.yacy.kelondro.util.DateFormatter;
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public class DCEntry extends TreeMap<String, String> {
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private static final long serialVersionUID = -2050291583515701559L;
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// use a collator to relax when distinguishing between lowercase und uppercase letters
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private static final Collator insensitiveCollator = Collator.getInstance(Locale.US);
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static {
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insensitiveCollator.setStrength(Collator.SECONDARY);
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insensitiveCollator.setDecomposition(Collator.NO_DECOMPOSITION);
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}
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public static final DCEntry poison = new DCEntry();
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public DCEntry() {
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super((Collator) insensitiveCollator.clone());
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}
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public DCEntry(
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DigestURI url,
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Date date,
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String title,
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String author,
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String body
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) {
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super((Collator) insensitiveCollator.clone());
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this.put("dc:identifier", url.toNormalform(true, false));
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this.put("dc:date", DateFormatter.formatISO8601(date));
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this.put("dc:title", title);
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this.put("dc:creator", author);
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this.put("dc:description", body);
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}
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/*
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DC according to rfc 5013
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* dc_title
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* dc_creator
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* dc_subject
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* dc_description
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* dc_publisher
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dc_contributor
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dc_date
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dc_type
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* dc_format
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* dc_identifier
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* dc_source
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dc_language
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dc_relation
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dc_coverage
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dc_rights
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*/
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public Date getDate() {
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String d = this.get("docdatetime");
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if (d == null) d = this.get("dc:date");
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if (d == null) return null;
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if (d.length() == 0) return null;
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try {
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return DateFormatter.parseISO8601(d);
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} catch (ParseException e) {
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Log.logException(e);
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return new Date();
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}
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}
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public DigestURI getIdentifier(boolean useRelationAsAlternative) {
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String u = this.get("url");
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if (u == null) u = this.get("dc:identifier");
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if (u == null) return useRelationAsAlternative ? getRelation() : null;
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String[] urls = u.split(";");
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if (urls.length > 1) {
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// select one that fits
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u = bestU(urls);
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}
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try {
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return new DigestURI(u);
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} catch (MalformedURLException e) {
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if (useRelationAsAlternative) {
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DigestURI relation = this.getRelation();
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if (relation != null) return relation;
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Log.logWarning("DCEntry", "getIdentifier: url is bad, relation also: " + e.getMessage());
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}
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Log.logWarning("DCEntry", "getIdentifier: url is bad: " + e.getMessage());
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return null;
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}
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}
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public DigestURI getRelation() {
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String u = this.get("dc:relation");
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if (u == null) return null;
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String[] urls = u.split(";");
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if (urls.length > 1) {
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// select one that fits
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u = bestU(urls);
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}
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try {
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return new DigestURI(u);
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} catch (MalformedURLException e) {
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Log.logWarning("DCEntry", "getRelation: url is bad: " + e.getMessage());
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return null;
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}
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}
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private String bestU(String[] urls) {
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for (String uu: urls) {
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if (uu.startsWith("http://") && (uu.endsWith(".html") || uu.endsWith(".htm") || uu.endsWith(".pdf") || uu.endsWith(".doc") || uu.endsWith(".rss") || uu.endsWith(".xml"))) return uu;
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}
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for (String uu: urls) {
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if (uu.startsWith("http://")) return uu;
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}
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for (String uu: urls) {
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if (uu.startsWith("ftp://")) return uu;
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}
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for (String uu: urls) {
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//urn identifier koennen ueber den resolver der d-nb aufgeloest werden:
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//http://nbn-resolving.de/urn:nbn:de:bsz:960-opus-1860
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if (uu.startsWith("urn:")) return "http://nbn-resolving.de/" + uu;
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}
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return urls[0];
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}
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public String getLanguage() {
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String l = this.get("language");
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if (l == null) l = this.get("dc:language");
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if (l == null) return getIdentifier(true).language();
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return l;
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}
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public String getType() {
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String t = this.get("dc:type");
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if (t == null) return "";
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return t;
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}
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public String getFormat() {
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String t = this.get("dc:format");
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if (t == null) return "";
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return t;
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}
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public String getSource() {
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String t = this.get("dc:source");
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if (t == null) return "";
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return t;
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}
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public String getRights() {
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String t = this.get("dc:rights");
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if (t == null) return "";
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return t;
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}
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public String getTitle() {
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String t = this.get("title");
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if (t == null) t = this.get("dc:title");
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t = stripCDATA(t);
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if (t == null) return "";
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return t;
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}
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public String getPublisher() {
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String t = this.get("dc:publisher");
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t = stripCDATA(t);
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if (t == null) return "";
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return t;
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}
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public String getCreator() {
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String t = this.get("author");
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if (t == null) t = this.get("dc:creator");
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t = stripCDATA(t);
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if (t == null) return "";
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return t;
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}
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public String getDescription() {
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String t = this.get("body");
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if (t == null) t = this.get("dc:description");
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t = stripCDATA(t);
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if (t == null) return "";
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return t;
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}
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public String[] getSubject() {
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String t = this.get("categories");
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if (t == null) this.get("dc:subject");
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t = stripCDATA(t);
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if (t == null) return new String[]{};
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return t.split(";");
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}
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private String stripCDATA(String s) {
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if (s == null) return null;
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s = s.trim();
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if (s.startsWith("<![CDATA[")) s = s.substring(9);
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if (s.endsWith("]]")) s = s.substring(0, s.length() - 2);
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return s;
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}
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public Document document() {
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HashSet<String> languages = new HashSet<String>();
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languages.add(getLanguage());
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try {
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return new Document(
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getIdentifier(true),
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"text/html",
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"UTF-8",
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languages,
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getSubject(),
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getTitle(),
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getCreator(),
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getPublisher(),
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null,
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"",
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getDescription().getBytes("UTF-8"),
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null,
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null,
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null,
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false);
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} catch (UnsupportedEncodingException e) {
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Log.logException(e);
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return null;
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}
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}
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public void writeXML(OutputStreamWriter os) throws IOException {
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Document doc = document();
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if (doc != null) {
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doc.writeXML(os, this.getDate());
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}
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}
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} |