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/**
* AbstractScoreMap
* Copyright 2011 by Michael Peter Christen, mc@yacy.net, Frankfurt am Main, Germany
* First released 16.12.2011 at http://yacy.net
*
* $LastChangedDate: 2011-04-14 00:04:23 +0200 (Do, 14 Apr 2011) $
* $LastChangedRevision: 7653 $
* $LastChangedBy: orbiter $
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program in the file lgpl21.txt
* If not, see <http://www.gnu.org/licenses/>.
*/
package net.yacy.cora.lod;
import java.util.HashMap;
import java.util.Map;
import net.yacy.cora.document.encoding.UTF8;
import net.yacy.cora.lod.vocabulary.Rdf;
/**
* class for a RDF node element. For a short primer see
* http://www.w3.org/TR/REC-rdf-syntax/
*/
public class Node extends HashMap<String, byte[]> implements Map<String, byte[]> {
private static final long serialVersionUID = -6715118942251224832L;
public static final String SUBJECT = "rdf:about";
private final Rdf type;
public Node(Rdf type) {
super();
this.type = type;
}
public Node(Rdf type, byte[] subject) {
this(type);
this.put(SUBJECT, subject);
}
/**
* initialize the triples.
* one of the properties must be the resource SUBJECT
* for a blank node the SUBJECT can be omitted
* @param set
*/
public Node(Rdf type, Map<String, byte[]> set) {
this(type);
this.putAll(set);
}
public Rdf getType() {
return this.type;
}
public boolean isBlank() {
return !this.containsKey(SUBJECT);
}
public byte[] getSubject() {
return this.get(SUBJECT);
}
public void setSubject(byte[] subject) {
this.put(SUBJECT, subject);
}
public byte[] getObject(Vocabulary predicate) {
return this.get(predicate.getPredicate());
}
public byte[] setObject(Vocabulary predicate, byte[] object) {
return this.put(predicate.getPredicate(), object);
}
public byte[] removePredicate(Vocabulary predicate) {
return this.remove(predicate.getPredicate());
}
public byte[] toObject() {
StringBuilder sb = new StringBuilder(this.size() * 50);
sb.append("<");
sb.append(this.type.getPredicate());
byte[] subject = this.get(SUBJECT);
if (subject != null) sb.append(" rdf:about=\"").append(UTF8.String(subject)).append('\"');
sb.append(">\n");
for (Map.Entry<String, byte[]> entry: this.entrySet()) {
if (entry.getKey().equals(SUBJECT)) continue;
sb.append('<').append(entry.getKey()).append('>');
sb.append(UTF8.String(entry.getValue()));
sb.append("</").append(entry.getKey()).append(">\n");
}
sb.append("</");
sb.append(this.type.getPredicate());
sb.append(">\n");
return UTF8.getBytes(sb);
}
}
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