/**
* Copyright 2005-2014 Restlet
*
* The contents of this file are subject to the terms of one of the following
* open source licenses: Apache 2.0 or or EPL 1.0 (the "Licenses"). You can
* select the license that you prefer but you may not use this file except in
* compliance with one of these Licenses.
*
* You can obtain a copy of the Apache 2.0 license at
* http://www.opensource.org/licenses/apache-2.0
*
* You can obtain a copy of the EPL 1.0 license at
* http://www.opensource.org/licenses/eclipse-1.0
*
* See the Licenses for the specific language governing permissions and
* limitations under the Licenses.
*
* Alternatively, you can obtain a royalty free commercial license with less
* limitations, transferable or non-transferable, directly at
* http://restlet.com/products/restlet-framework
*
* Restlet is a registered trademark of Restlet S.A.S.
*/
package org.restlet.ext.rdf;
import java.io.IOException;
import org.restlet.data.Reference;
/**
* Handler for the content of a {@link Graph}. List of callbacks used when
* parsing or writing a representation of a RDF graph.
*/
public abstract class GraphHandler {
/**
* Callback method used after the graph is parsed or written. Does nothing
* by default.
*
* @throws IOException
*/
public void endGraph() throws IOException {
}
/**
* Callback method used at the end of a Namespace mapping. Does nothing by
* default.
*
* @param prefix
* The Namespace prefix.
*/
public void endPrefixMapping(String prefix) {
}
/**
* Callback method used when a link is parsed or written.
*
* @param source
* The source or subject of the link.
* @param typeRef
* The type reference of the link.
* @param target
* The target or object of the link.
*/
public abstract void link(Graph source, Reference typeRef, Literal target);
/**
* Callback method used when a link is parsed or written.
*
* @param source
* The source or subject of the link.
* @param typeRef
* The type reference of the link.
* @param target
* The target or object of the link.
*/
public abstract void link(Graph source, Reference typeRef, Reference target);
/**
* Callback method used when a link is parsed or written.
*
* @param source
* The source or subject of the link.
* @param typeRef
* The type reference of the link.
* @param target
* The target or object of the link.
*/
public abstract void link(Reference source, Reference typeRef,
Literal target);
/**
* Callback method used when a link is parsed or written.
*
* @param source
* The source or subject of the link.
* @param typeRef
* The type reference of the link.
* @param target
* The target or object of the link.
*/
public abstract void link(Reference source, Reference typeRef,
Reference target);
/**
* Callback method used before the graph is parsed or written. Does nothing
* by default.
*
* @throws IOException
*/
public void startGraph() throws IOException {
}
/**
* Callback method used at the start of a Namespace mapping. Does nothing by
* default.
*
* @param prefix
* The Namespace prefix being declared.
* @param reference
* The Namespace URI mapped to the prefix.
*/
public void startPrefixMapping(String prefix, Reference reference) {
}
}