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/* Vertex.java
* =========================================================================
* This file is part of the GrInvIn project - http://www.grinvin.org
*
* Copyright (C) 2005-2008 Universiteit Gent
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
package org.grinvin.graphs;
/**
* Represents a single vertex in a graph. A given vertex can belong to at most one graph
* at the same time.<p>
* It is allowed for vertices to 'survive' after having been
* removed from a graph. Typically, such <i>zombie</i> vertices are kept in memory so that
* the undo/redo-manager may still restore it to the graph at a later time.
* @see DefaultGraphModel
*/
public interface Vertex extends Element {
/**
* Return the current index of this vertex. This index represents a sequence
* number in the set of vertices of the graph to which this vertex belongs.
* The index lies in the range 0..n-1, where n denotes the total number of vertices
* of the graph.<p>
* The index of a vertex may change when other vertices
* are removed from its parent graph. A vertex which is itself removed from its graph
* keeps its index.<p>
*/
int getIndex();
void setIndex(int index);
}
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