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The GraphStream library. With GraphStream you deal with graphs. Static and Dynamic. You create them from scratch, from a file or any source. You display and render them. This is the core package that contains the minimal needed to read and write a graph.
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/*
 * Copyright 2006 - 2011 
 *     Julien Baudry	
 *     Antoine Dutot	
 *     Yoann Pigné		
 *     Guilhelm Savin	
 * 
 * This file is part of GraphStream .
 * 
 * GraphStream is a library whose purpose is to handle static or dynamic
 * graph, create them from scratch, file or any source and display them.
 * 
 * This program is free software distributed under the terms of two licenses, the
 * CeCILL-C license that fits European law, and the GNU Lesser General Public
 * License. You can  use, modify and/ or redistribute the software under the terms
 * of the CeCILL-C license as circulated by CEA, CNRS and INRIA at the following
 * URL  or under the terms of the GNU LGPL as published by
 * the Free Software Foundation, either version 3 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 * 
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL-C and LGPL licenses and that you accept their terms.
 */
package org.graphstream.stream;

/**
 * Interface to listen at changes on attributes of a graph.
 * 
 * 
 * The graph attributes listener is called each time an attribute is added, or
 * removed, and each time its value is changed.
 * 
 */
public interface AttributeSink {
	/**
	 * A graph attribute was added.
	 * 
	 * @param sourceId
	 *            Identifier of the graph where the attribute changed.
	 * @param attribute
	 *            The attribute name.
	 * @param value
	 *            The attribute new value.
	 */
	void graphAttributeAdded(String sourceId, long timeId, String attribute,
			Object value);

	/**
	 * A graph attribute was changed.
	 * 
	 * @param sourceId
	 *            Identifier of the graph where the attribute changed.
	 * @param attribute
	 *            The attribute name.
	 * @param oldValue
	 *            The attribute old value.
	 * @param newValue
	 *            The attribute new value.
	 */
	void graphAttributeChanged(String sourceId, long timeId, String attribute,
			Object oldValue, Object newValue);

	/**
	 * A graph attribute was removed.
	 * 
	 * @param sourceId
	 *            Identifier of the graph where the attribute was removed.
	 * @param attribute
	 *            The removed attribute name.
	 */
	void graphAttributeRemoved(String sourceId, long timeId, String attribute);

	/**
	 * A node attribute was added.
	 * 
	 * @param sourceId
	 *            Identifier of the graph where the change occurred.
	 * @param nodeId
	 *            Identifier of the node whose attribute changed.
	 * @param attribute
	 *            The attribute name.
	 * @param value
	 *            The attribute new value.
	 */
	void nodeAttributeAdded(String sourceId, long timeId, String nodeId,
			String attribute, Object value);

	/**
	 * A node attribute was changed.
	 * 
	 * @param sourceId
	 *            Identifier of the graph where the change occurred.
	 * @param nodeId
	 *            Identifier of the node whose attribute changed.
	 * @param attribute
	 *            The attribute name.
	 * @param oldValue
	 *            The attribute old value.
	 * @param newValue
	 *            The attribute new value.
	 */
	void nodeAttributeChanged(String sourceId, long timeId, String nodeId,
			String attribute, Object oldValue, Object newValue);

	/**
	 * A node attribute was removed.
	 * 
	 * @param sourceId
	 *            Identifier of the graph where the attribute was removed.
	 * @param nodeId
	 *            Identifier of the node whose attribute was removed.
	 * @param attribute
	 *            The removed attribute name.
	 */
	void nodeAttributeRemoved(String sourceId, long timeId, String nodeId,
			String attribute);

	/**
	 * A edge attribute was added.
	 * 
	 * @param sourceId
	 *            Identifier of the graph where the change occurred.
	 * @param edgeId
	 *            Identifier of the edge whose attribute changed.
	 * @param attribute
	 *            The attribute name.
	 * @param value
	 *            The attribute new value.
	 */
	void edgeAttributeAdded(String sourceId, long timeId, String edgeId,
			String attribute, Object value);

	/**
	 * A edge attribute was changed.
	 * 
	 * @param sourceId
	 *            Identifier of the graph where the change occurred.
	 * @param edgeId
	 *            Identifier of the edge whose attribute changed.
	 * @param attribute
	 *            The attribute name.
	 * @param oldValue
	 *            The attribute old value.
	 * @param newValue
	 *            The attribute new value.
	 */
	void edgeAttributeChanged(String sourceId, long timeId, String edgeId,
			String attribute, Object oldValue, Object newValue);

	/**
	 * A edge attribute was removed.
	 * 
	 * @param sourceId
	 *            Identifier of the graph where the attribute was removed.
	 * @param edgeId
	 *            Identifier of the edge whose attribute was removed.
	 * @param attribute
	 *            The removed attribute name.
	 */
	void edgeAttributeRemoved(String sourceId, long timeId, String edgeId,
			String attribute);
}