/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.clerezza.platform.language;
import java.util.Iterator;
import java.util.concurrent.locks.Lock;
import org.apache.clerezza.rdf.core.Language;
import org.apache.clerezza.rdf.core.Literal;
import org.apache.clerezza.rdf.core.PlainLiteral;
import org.apache.clerezza.rdf.core.Resource;
import org.apache.clerezza.rdf.core.TripleCollection;
import org.apache.clerezza.rdf.core.access.LockableMGraph;
import org.apache.clerezza.rdf.ontologies.LINGVOJ;
import org.apache.clerezza.rdf.ontologies.RDFS;
import org.apache.clerezza.rdf.utils.GraphNode;
/**
* An object of this class keeps information about a language.
*
* @author mir
*/
public class LanguageDescription {
private GraphNode resource;
private Language language;
LanguageDescription(GraphNode resource) {
this.resource = resource;
Literal iso1Literal = null;
TripleCollection configGraph = resource.getGraph();
if (configGraph instanceof LockableMGraph) {
LockableMGraph lockableConfigGraph = (LockableMGraph)configGraph;
Lock readLock = lockableConfigGraph.getLock().readLock();
readLock.lock();
try {
iso1Literal = (Literal) resource.getObjects(LINGVOJ.iso1).next();
} finally {
readLock.unlock();
}
} else {
iso1Literal = (Literal) resource.getObjects(LINGVOJ.iso1).next();
}
if (iso1Literal == null) {
throw new RuntimeException("No iso1 code for " +resource.getNode());
}
String iso1 = iso1Literal.getLexicalForm();
this.language = new Language(iso1);
}
/**
* Returns a <code>Language</code> object which represents the language
* described by this object.
* @return the described language
*/
public Language getLanguage() {
return language;
}
/**
* Returns a graph node in the content graph which leads to further
* information about the language described by this object.
* The information are those provided by http://www.lingvoj.org/lingvoj.rdf.
* @return the graph node leading to further information about the described
* language
*/
public GraphNode getResource() {
return resource;
}
/**
* Returns the label of the language described by this object in the
* specified language, or null if no lable is available in that language
* @param lang the language in which the label should be.
* @return
*/
public String getLabel(Language lang) {
Lock readLock = null;
TripleCollection configGraph = resource.getGraph();
if (configGraph instanceof LockableMGraph) {
LockableMGraph lockableConfigGraph = (LockableMGraph)configGraph;
readLock = lockableConfigGraph.getLock().readLock();
readLock.lock();
}
try {
Iterator<Resource> labels = resource.getObjects(RDFS.label);
while (labels.hasNext()) {
PlainLiteral label = (PlainLiteral) labels.next();
if (label.getLanguage().equals(lang)) {
return label.getLexicalForm();
}
}
return null;
} finally {
if (readLock != null) {
readLock.unlock();
}
}
}
}