114 lines
3.4 KiB
Java
114 lines
3.4 KiB
Java
/**
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* AbstractScoreMap
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* Copyright 2011 by Michael Peter Christen, mc@yacy.net, Frankfurt am Main, Germany
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* First released 16.12.2011 at http://yacy.net
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*
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* $LastChangedDate: 2011-04-14 00:04:23 +0200 (Do, 14 Apr 2011) $
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* $LastChangedRevision: 7653 $
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* $LastChangedBy: orbiter $
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.cora.lod;
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import java.util.HashMap;
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import java.util.Map;
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import net.yacy.cora.document.encoding.UTF8;
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import net.yacy.cora.lod.vocabulary.Rdf;
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/**
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* class for a RDF node element. For a short primer see
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* http://www.w3.org/TR/REC-rdf-syntax/
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*/
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public class Node extends HashMap<String, byte[]> implements Map<String, byte[]> {
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private static final long serialVersionUID = -6715118942251224832L;
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public static final String SUBJECT = "rdf:about";
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private final Rdf type;
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public Node(Rdf type) {
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super();
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this.type = type;
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}
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public Node(Rdf type, byte[] subject) {
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this(type);
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this.put(SUBJECT, subject);
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}
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/**
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* initialize the triples.
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* one of the properties must be the resource SUBJECT
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* for a blank node the SUBJECT can be omitted
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* @param set
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*/
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public Node(Rdf type, Map<String, byte[]> set) {
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this(type);
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this.putAll(set);
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}
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public Rdf getType() {
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return this.type;
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}
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public boolean isBlank() {
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return !this.containsKey(SUBJECT);
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}
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public byte[] getSubject() {
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return this.get(SUBJECT);
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}
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public void setSubject(byte[] subject) {
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this.put(SUBJECT, subject);
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}
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public byte[] getObject(Vocabulary predicate) {
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return this.get(predicate.getPredicate());
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}
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public byte[] setObject(Vocabulary predicate, byte[] object) {
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return this.put(predicate.getPredicate(), object);
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}
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public byte[] removePredicate(Vocabulary predicate) {
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return this.remove(predicate.getPredicate());
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}
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public byte[] toObject() {
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StringBuilder sb = new StringBuilder(this.size() * 50);
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sb.append("<");
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sb.append(this.type.getPredicate());
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byte[] subject = this.get(SUBJECT);
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if (subject != null) sb.append(" rdf:about=\"").append(UTF8.String(subject)).append('\"');
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sb.append(">\n");
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for (Map.Entry<String, byte[]> entry: this.entrySet()) {
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if (entry.getKey().equals(SUBJECT)) continue;
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sb.append('<').append(entry.getKey()).append('>');
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sb.append(UTF8.String(entry.getValue()));
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sb.append("</").append(entry.getKey()).append(">\n");
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}
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sb.append("</");
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sb.append(this.type.getPredicate());
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sb.append(">\n");
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return UTF8.getBytes(sb);
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}
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}
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