/* Copyright 2008-2010 Gephi Authors : Mathieu Bastian <mathieu.bastian@gephi.org> Website : http://www.gephi.org This file is part of Gephi. DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. Copyright 2011 Gephi Consortium. All rights reserved. The contents of this file are subject to the terms of either the GNU General Public License Version 3 only ("GPL") or the Common Development and Distribution License("CDDL") (collectively, the "License"). You may not use this file except in compliance with the License. You can obtain a copy of the License at http://gephi.org/about/legal/license-notice/ or /cddl-1.0.txt and /gpl-3.0.txt. See the License for the specific language governing permissions and limitations under the License. When distributing the software, include this License Header Notice in each file and include the License files at /cddl-1.0.txt and /gpl-3.0.txt. If applicable, add the following below the License Header, with the fields enclosed by brackets [] replaced by your own identifying information: "Portions Copyrighted [year] [name of copyright owner]" If you wish your version of this file to be governed by only the CDDL or only the GPL Version 3, indicate your decision by adding "[Contributor] elects to include this software in this distribution under the [CDDL or GPL Version 3] license." If you do not indicate a single choice of license, a recipient has the option to distribute your version of this file under either the CDDL, the GPL Version 3 or to extend the choice of license to its licensees as provided above. However, if you add GPL Version 3 code and therefore, elected the GPL Version 3 license, then the option applies only if the new code is made subject to such option by the copyright holder. Contributor(s): Portions Copyrighted 2011 Gephi Consortium. */ package org.gephi.graph.api; /** * Edge interface. An edge connects two nodes and can be <b>directed</b> or * not. * <p> * If working with several {@link GraphView}, note that <code>source</code> and * <code>target</code> are always nodes in the <b>main</b> view. To obtain nodes * in other views, do: * <pre> * GraphView view = ...; * Node node = node.getNodeData().getNode(view.getViewId()); * </pre> * * @author Mathieu Bastian */ public interface Edge extends Attributable { /** * Returns the unique identifier of the edge. * @return the Id of the edge */ public int getId(); /** * Returns the source of the edge. * @return the source of the edge */ public Node getSource(); /** * Returns the target of the edge. * @return the target of the edge */ public Node getTarget(); /** * Returns the weight of the edge. Default value is 1.0. * @return the weight of the edge */ public float getWeight(); /** * Returns the weight of the edge for the given time interval. * If the weight is dynamic, it has several values over time. This method * returns the weight for a particular interval. * @param low the lower interval bound, can be * <code>Double.NEGATIVE_INFINITY</code> * @param high the upper interval bound, can be * <code>Double.POSITIVE_INFINITY</code> * @return the weight of the edge at this [low,high] interval */ public float getWeight(double low, double high); /** * Set the weight of the edge. * @param weight the weight of the edge */ public void setWeight(float weight); /** * Returns <code>true</code> if the edge is directed or <code>false</code> if it's undirected. * Default is directed. Note that value is immutable.<p> * Special cases: * <ul><li>If the edge has been created from an <b>undirected</b> graph, returns false.</li> * <li>If the edge has been created from a <b>directed</b> graph, returns true.</li> * <li>If the edge has been created from a <b>mixed</b> graph, returns the value set to the * <code>addEdge()</code> method.</li></ul> * @return <code>true</code> if the edge is directed, <code>false</code> otherwise */ public boolean isDirected(); /** * Returns <code>true</code> if edge source and target are the same. * @return <code>true</code> if the edge is a self-loop, <code>false</code> otherwise */ public boolean isSelfLoop(); /** * Returns edge data. * @return edge data instance */ public EdgeData getEdgeData(); }