/*
* $Header$
* $Revision: 982 $
* $Date: 2006-12-08 18:42:51 +1000 (Fri, 08 Dec 2006) $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2003-2009 The JRDF Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* the JRDF Project (http://jrdf.sf.net/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The JRDF Project" and "JRDF" must not be used to endorse
* or promote products derived from this software without prior written
* permission. For written permission, please contact
* newmana@users.sourceforge.net.
*
* 5. Products derived from this software may not be called "JRDF"
* nor may "JRDF" appear in their names without prior written
* permission of the JRDF Project.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the JRDF Project. For more
* information on JRDF, please see <http://jrdf.sourceforge.net/>.
*
*/
package org.jrdf.writer.mem;
import org.jrdf.graph.Graph;
import org.jrdf.graph.GraphException;
import org.jrdf.graph.Node;
import org.jrdf.graph.URIReference;
import static org.jrdf.query.relation.type.PredicateNodeType.PREDICATE_TYPE;
import org.jrdf.util.ClosableIterable;
import org.jrdf.vocabulary.RDF;
import org.jrdf.vocabulary.RDFS;
import org.jrdf.writer.NamespaceException;
import org.jrdf.writer.RdfNamespaceMap;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* Contains mappings between namespaces and partial URIs.
*
* @author TurnerRX
*/
public class RdfNamespaceMapImpl implements RdfNamespaceMap {
private static final String NS_PREFIX = "ns";
private Map<String, String> names = new HashMap<String, String>();
private Map<String, String> uris = new HashMap<String, String>();
public RdfNamespaceMapImpl() {
// add some well known namespaces
initNamespaces();
}
public void load(Graph graph) throws GraphException {
// check for blank nodes
ClosableIterable<? extends Node> predicates = graph.findNodes(PREDICATE_TYPE);
for (Node node : predicates) {
URIReference uriReference = (URIReference) node;
String partial = getPartialUri(uriReference.getURI().toString());
if (!uris.containsKey(partial)) {
String ns = NS_PREFIX + names.size();
add(ns, partial);
}
}
}
public String replaceNamespace(URIReference resource) throws NamespaceException {
URI uri = resource.getURI();
String full = uri.toString();
String partial = getPartialUri(full);
String ns = uris.get(partial);
if (ns == null) {
throw new NamespaceException("Partial uri: " + partial + " is not mapped to a namespace.");
}
return full.replaceFirst(partial, ns + ":");
}
public String getPrefix(URIReference resource) {
URI uri = resource.getURI();
String partial = getPartialUri(uri.toString());
return uris.get(partial);
}
public String getFullUri(String partial) {
return names.get(partial);
}
public Set<Map.Entry<String, String>> getNameEntries() {
return names.entrySet();
}
public void reset() {
names.clear();
uris.clear();
initNamespaces();
}
private void initNamespaces() {
add("rdf", getPartialUri(RDF.BASE_URI.toString()));
add("rdfs", getPartialUri(RDFS.BASE_URI.toString()));
add("owl", "http://www.w3.org/2002/07/owl#");
add("dc", "http://purl.org/dc/elements/1.1/");
add("dcterms", "http://purl.org/dc/terms/");
}
public String toString() {
return names.toString();
}
/**
* Extracts the uri to the last '#' or '/' character.
*
* @param uri String URI
* @return String partial URI
*/
private String getPartialUri(String uri) {
int hashIndex = uri.lastIndexOf('#');
int slashIndex = uri.lastIndexOf('/');
int index = Math.max(hashIndex, slashIndex);
// if there is no '#' or '/', return entire uri
return (index > 0) && (index < uri.length()) ? uri.substring(0, ++index) : uri;
}
private void add(String name, String uri) {
// map bi-directionally
uris.put(uri, name);
names.put(name, uri);
}
}