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/* Graph6Loader.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.io.graphs;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.ResourceBundle;
import org.grinvin.graphs.DefaultGraphBundle;
import org.grinvin.graphs.Embedding;
import org.grinvin.graphs.Graph;
import org.grinvin.graphs.GraphBundle;
import org.grinvin.graphs.Vertex;
import org.grinvin.list.graphs.GraphList;
import org.grinvin.list.graphs.GraphListElementManager;
import org.grinvin.util.InternationalizedProperties;
/**
* Several static methods to load graph6 (.g6) files in GrInvIn
*/
public class Graph6Loader {
private static final ResourceBundle BUNDLE = ResourceBundle.getBundle("org.grinvin.io.resources");
/**
* Reads the entire file and stores all the graphs in a GraphInvariantListModel
*/
public static void readFile(GraphList list, File file) throws FileNotFoundException, IOException {
BufferedReader buf = new BufferedReader(new FileReader(file));
String graph = buf.readLine();
int i = 1;
while(graph != null && graph.length()!=0){
GraphBundle bundle = new DefaultGraphBundle();
InternationalizedProperties iprops = new InternationalizedProperties();
iprops.setProperty("graph.name", BUNDLE.getString("graph.name") + " " + (i++));
bundle.setProperties(iprops);
readGraph(bundle, new StringReader(graph));
list.add(GraphListElementManager.getInstance().createGraphListElement(bundle));
graph = buf.readLine();
}
}
/**
* Only reads the first graph in the file and stores it in a GraphBundle.
*/
public static void readSingleGraph(GraphBundle bundle, File file) throws FileNotFoundException, IOException{
Reader reader = new FileReader(file);
InternationalizedProperties iprops = new InternationalizedProperties();
iprops.setProperty("graph.name", file.getName());
bundle.setProperties(iprops);
readGraph(bundle, reader);
}
//read a graph and store it in the bundle
private static void readGraph(GraphBundle bundle, Reader reader) throws FileNotFoundException, IOException{
//determine order of the graph
int c = reader.read();
int order;
if (c=='>') {
//header, so skip it
while(c!='<')
c = reader.read();
reader.read(); //header ends with <<
c=reader.read();
}
if(c==-1)
throw new RuntimeException("EOF"); //TODO: do something else
else if (c==126) {
int c2 = reader.read();
if(c2==126)
//order n was greater or equal to 258047 --> N(n)=126 126 R(x)
order = (reader.read()-63)*(1<<30) + (reader.read()-63)*(1<<24) +(reader.read()-63)*(1<<18) +
(reader.read()-63)*(1<<12) + (reader.read()-63)*(1<<6) + (reader.read()-63);
else
//order n was greater or equal to 63, but smaller than 258048 --> N(n)=126 R(x)
order = (c2-63)*(1<<12) + (reader.read()-63)*(1<<6) + (reader.read()-63);
} else
//order n was between 0 and 63 --> N(n)=n+63
order = c-63;
Graph graph = bundle.createGraph();
Embedding embedding = bundle.createEmbedding();
embedding.setDimension(2);
Vertex[] vertices = new Vertex[order];
//no embedding comes with graph6 file, so we just place the vertices on a circle
for(int i = 0; i < order; i++) {
double angle = 2 * i * Math.PI / order;
double[] coords = new double[2];
coords[0] = Math.cos(angle);
coords[1] = Math.sin(angle);
vertices[i] = graph.addNewVertex();
embedding.setCoordinates(vertices[i], coords);
}
boolean[] sixBits = new boolean[6];
getSixBits(reader.read()-63,sixBits);
int k = 0;
for(int i = 1; i<order; i++){
for(int j = 0; j<i; j++){
if(sixBits[k++])
graph.addNewEdge(vertices[i], vertices[j]);
if(k>5){
getSixBits(reader.read()-63,sixBits);
k=0;
}
}
}
reader.close();
}
//transform an integer to a six bit representation
private static void getSixBits(int c, boolean[] sixBits){
for(int i = 5; i>=0; i--){
sixBits[i]=(c%2 == 1);
c = c/2;
}
}
}
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