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RDF2go is an implementation-independent Java API with the design goals: portability (hence the name), performance and ease of implementation. This project was started at FZI Forschungszentrum Informatik Karlsruhe, Germany - www.fzi.de

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/**
 * LICENSE INFORMATION
 * 
 * Copyright 2005-2008 by FZI (http://www.fzi.de). Licensed under a BSD license
 * (http://www.opensource.org/licenses/bsd-license.php)  = Max Völkel
 *  = FZI Forschungszentrum Informatik Karlsruhe, Karlsruhe,
 * Germany  = 2010
 * 
 * Further project information at http://semanticweb.org/wiki/RDF2Go
 */

package org.ontoware.rdf2go.util;

import org.ontoware.aifbcommons.collection.ClosableIterator;
import org.ontoware.rdf2go.RDF2Go;
import org.ontoware.rdf2go.model.Model;
import org.ontoware.rdf2go.model.Statement;
import org.ontoware.rdf2go.model.node.LanguageTagLiteral;


public class LanguageTools {
	
	/**
	 * Deletes all literals except the ones in the desired language.
	 * 
	 * Removes all language-tagged literals that DO NOT start with the
	 * 'language' string.
	 * 
	 * @param model which should be stripped of unwanted languagetagged literals
	 * @param language language which should be kept
	 * @return a Model that contains only literals in the desired language
	 */
	public static Model selectLanguage(Model model, String language) {
		Model result = RDF2Go.getModelFactory().createModel();
		result.open();
		ClosableIterator it = model.iterator();
		while(it.hasNext()) {
			Statement s = it.next();
			if(s.getObject() instanceof LanguageTagLiteral) {
				LanguageTagLiteral lit = s.getObject().asLanguageTagLiteral();
				if(lit.getLanguageTag().startsWith(language)) {
					result.addStatement(s);
				}
				// else don't copy
			} else {
				result.addStatement(s);
			}
		}
		it.close();
		return result;
	}
	
}