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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.
The newest version!
/*
* 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
* @author Yoann Pigné
* @author Guilhelm Savin
* @author Hicham Brahimi
*/
package org.graphstream.stream;
import org.graphstream.graph.Edge;
import org.graphstream.graph.Graph;
import org.graphstream.graph.Node;
/**
* A simple source of graph events that takes an existing graph and creates a
* flow of events by enumerating all nodes, edges and attributes of the graph.
*
*
* The only method of this class is {@link #replay(Graph)} that takes a graph as
* argument and :
*
* - First exports all graph attributes as attribute-addition events.
* - Then exports all nodes as node-creation events.
*
* - For each node exports all the node attributes as attribute-addition
* events.
*
*
* - Then exports all edges ad edge-creation events.
*
* - For each edge exports all the edge attribute as attribute-addition
* events.
*
*
*
* In this order.
*
*
*
* Note that this is a source, not a pipe. This means that it has its own
* identifier and is a producer of "new" events. Also note that is does not
* export the dynamics of the graph, only its structure at the present time (the
* evolution of the graph is not stored in the graph, to produce a dynamic flow
* of events of the evolution of a graph you have to register the sinks in the
* graph itself just after its creation).
*
*/
public class GraphReplay extends SourceBase implements Source {
public GraphReplay(String id) {
super(id);
}
/**
* Echo each element and attribute of the graph to the registered sinks.
*
* @param graph
* The graph to export.
*/
public void replay(Graph graph) {
graph.attributeKeys().forEach(key -> sendGraphAttributeAdded(sourceId, key, graph.getAttribute(key)));
graph.nodes().forEach(node -> {
String nodeId = node.getId();
sendNodeAdded(sourceId, nodeId);
if (node.getAttributeCount() > 0)
node.attributeKeys()
.forEach(key -> sendNodeAttributeAdded(sourceId, nodeId, key, node.getAttribute(key)));
});
graph.edges().forEach(edge -> {
String edgeId = edge.getId();
sendEdgeAdded(sourceId, edgeId, edge.getNode0().getId(), edge.getNode1().getId(), edge.isDirected());
if (edge.getAttributeCount() > 0)
edge.attributeKeys()
.forEach(key -> sendEdgeAttributeAdded(sourceId, edgeId, key, edge.getAttribute(key)));
});
}
}