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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 - 2015
 *     Stefan Balev     
 *     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;

import org.graphstream.stream.SourceBase.ElementType;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.EnumMap;
import java.util.HashMap;

/**
 * A sink easily allowing a bind between attribute modifications and method
 * calls.
 * 
 * 
 * public class MyObject extends AnnotatedSink {
 * 	String a1;
 * 	double a2;
 * 
 * 	@Bind("myobject.set.a1")
 * 	public void setA1(String eventId, Object value) {
 * 		a1 = (String) value;
 * 	}
 * 
 * 	@Bind("myobject.set.a2")
 * 	public void setA2(String eventId, Object value) {
 * 		a2 = (Double) value;
 * 	}
 * 
 * 	public static void main(String ... args) {
 * 			Graph g = ...;
 * 			MyObject obj = new MyObject();
 * 
 * 			g.addSink(obj);
 * 			
 * 			g.addAttribute("myobject.set.a1", "MyObject A1");
 * 			g.addAttribute("myobject.set.a2", 100.0);
 * 		}
 * }
 * 

 */
public abstract class AnnotatedSink implements Sink {
	/**
	 * Annotation used to bind an event to a method. This bind is composed of a
	 * name (the attribute key) and an element type. For example, the annotation
	 * 
	 * 
	 * @Bind(value = "test", type = ElementType.NODE)
	 * 

	 * 
	 * will be triggered the annotated method when receiving
	 * 'nodeAttributeXXX()' methods.
	 */
	@Documented
	@Retention(RetentionPolicy.RUNTIME)
	@Target(java.lang.annotation.ElementType.METHOD)
	public static @interface Bind {
		/**
		 * Name of the attribute key that triggered the annotated method.
		 * 
		 * @return an attribute key
		 */
		String value();

		/**
		 * Type of element that triggered the annotated method. Default is
		 * GRAPH.
		 * 
		 * @return type of element in GRAPH, NODE or EDGE
		 */
		ElementType type() default ElementType.GRAPH;
	}

	private final EnumMap methods;

	protected AnnotatedSink() {
		methods = new EnumMap(ElementType.class);
		methods.put(ElementType.GRAPH, new MethodMap());
		methods.put(ElementType.EDGE, new MethodMap());
		methods.put(ElementType.NODE, new MethodMap());

		Method[] ms = getClass().getMethods();

		if (ms != null) {
			for (int i = 0; i < ms.length; i++) {
				Method m = ms[i];
				Bind b = m.getAnnotation(Bind.class);
				
				if (b != null)
					methods.get(b.type()).put(b.value(), m);
			}
		}
	}

	private void invoke(Method m, Object... args) {
		try {
			m.invoke(this, args);
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			e.printStackTrace();
		}
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.AttributeSink#edgeAttributeAdded(java.lang.String, long, java.lang.String, java.lang.String, java.lang.Object)
	 */
	public void edgeAttributeAdded(String sourceId, long timeId, String edgeId,
			String attribute, Object value) {
		Method m = methods.get(ElementType.EDGE).get(attribute);

		if (m != null)
			invoke(m, edgeId, attribute, value);
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.AttributeSink#edgeAttributeChanged(java.lang.String, long, java.lang.String, java.lang.String, java.lang.Object, java.lang.Object)
	 */
	public void edgeAttributeChanged(String sourceId, long timeId,
			String edgeId, String attribute, Object oldValue, Object newValue) {
		Method m = methods.get(ElementType.EDGE).get(attribute);

		if (m != null)
			invoke(m, edgeId, attribute, newValue);
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.AttributeSink#edgeAttributeRemoved(java.lang.String, long, java.lang.String, java.lang.String)
	 */
	public void edgeAttributeRemoved(String sourceId, long timeId,
			String edgeId, String attribute) {
		Method m = methods.get(ElementType.EDGE).get(attribute);

		if (m != null)
			invoke(m, edgeId, attribute, null);
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.AttributeSink#graphAttributeAdded(java.lang.String, long, java.lang.String, java.lang.Object)
	 */
	public void graphAttributeAdded(String sourceId, long timeId,
			String attribute, Object value) {
		Method m = methods.get(ElementType.GRAPH).get(attribute);

		if (m != null)
			invoke(m, attribute, value);
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.AttributeSink#graphAttributeChanged(java.lang.String, long, java.lang.String, java.lang.Object, java.lang.Object)
	 */
	public void graphAttributeChanged(String sourceId, long timeId,
			String attribute, Object oldValue, Object newValue) {
		Method m = methods.get(ElementType.GRAPH).get(attribute);

		if (m != null)
			invoke(m, attribute, newValue);
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.AttributeSink#graphAttributeRemoved(java.lang.String, long, java.lang.String)
	 */
	public void graphAttributeRemoved(String sourceId, long timeId,
			String attribute) {
		Method m = methods.get(ElementType.GRAPH).get(attribute);

		if (m != null)
			invoke(m, attribute, null);
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.AttributeSink#nodeAttributeAdded(java.lang.String, long, java.lang.String, java.lang.String, java.lang.Object)
	 */
	public void nodeAttributeAdded(String sourceId, long timeId, String nodeId,
			String attribute, Object value) {
		Method m = methods.get(ElementType.NODE).get(attribute);

		if (m != null)
			invoke(m, nodeId, attribute, value);
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.AttributeSink#nodeAttributeChanged(java.lang.String, long, java.lang.String, java.lang.String, java.lang.Object, java.lang.Object)
	 */
	public void nodeAttributeChanged(String sourceId, long timeId,
			String nodeId, String attribute, Object oldValue, Object newValue) {
		Method m = methods.get(ElementType.NODE).get(attribute);

		if (m != null)
			invoke(m, nodeId, attribute, newValue);
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.AttributeSink#nodeAttributeRemoved(java.lang.String, long, java.lang.String, java.lang.String)
	 */
	public void nodeAttributeRemoved(String sourceId, long timeId,
			String nodeId, String attribute) {
		Method m = methods.get(ElementType.NODE).get(attribute);

		if (m != null)
			invoke(m, nodeId, attribute, null);
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.ElementSink#edgeAdded(java.lang.String, long, java.lang.String, java.lang.String, java.lang.String, boolean)
	 */
	public void edgeAdded(String sourceId, long timeId, String edgeId,
			String fromNodeId, String toNodeId, boolean directed) {
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.ElementSink#edgeRemoved(java.lang.String, long, java.lang.String)
	 */
	public void edgeRemoved(String sourceId, long timeId, String edgeId) {
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.ElementSink#graphCleared(java.lang.String, long)
	 */
	public void graphCleared(String sourceId, long timeId) {
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.ElementSink#nodeAdded(java.lang.String, long, java.lang.String)
	 */
	public void nodeAdded(String sourceId, long timeId, String nodeId) {
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.ElementSink#nodeRemoved(java.lang.String, long, java.lang.String)
	 */
	public void nodeRemoved(String sourceId, long timeId, String nodeId) {
	}

	/*
	 * (non-Javadoc)
	 * @see org.graphstream.stream.ElementSink#stepBegins(java.lang.String, long, double)
	 */
	public void stepBegins(String sourceId, long timeId, double step) {
	}

	private static class MethodMap extends HashMap {
		private static final long serialVersionUID = 1664854698109523697L;
	}
}




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