/** * 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) { } }