package de.unibremen.informatik.hets.graphviz;
import java.io.IOException;
import javax.swing.JOptionPane;
//import org.apache.log4j.Logger;
/**
* User: matthewhorridge
* The Univeristy Of Manchester
* Medical Informatics Group
* Date: Jan 16, 2004
*
* matthew.horridge@cs.man.ac.uk
* www.cs.man.ac.uk/~horridgm
*
* A wrapper for a native dot process.
*/
public class DotProcess {
//private static Logger log = Logger.getLogger(DotProcess.class);
private Process process;
/**
* Contructs a DotProcess, and starts
* the native dot process. Using the default process
* path for the particular platfrom being used.
*/
public DotProcess() {
}
/**
* Lays out a graph using the dot application
*
* @param fileName A file that acts as a 'scratch pad'
* The graph is read from this file, and then export
* to the same file in attributed dot format.
* @return true if the process completed without
* any errors, or false if the process did not
* complete.
*/
public boolean startProcess(String fileName) {
if(process != null) {
killProcess();
}
Runtime r = Runtime.getRuntime();
//DotLayoutEngineProperties properties = DotLayoutEngineProperties.getInstance();
try {
//process = r.exec(properties.getDotProcessPath() + " " + fileName + " -q -o " + fileName);
process = r.exec("/usr/bin/dot" + " " + fileName + " -q -o " + fileName);
try {
process.waitFor();
return true;
}
catch(InterruptedException irEx) {
irEx.printStackTrace();
return false;
}
}
catch(IOException ioEx) {
String errMsg = "An error related to DOT has occurred. " + "This error was probably because OWLViz could not" + " find the DOT application. Please ensure that the" + " path to the DOT application is set properly";
String dlgErrMsg = "A DOT error has occurred.
" +
"This is probably because OWLViz could not find the DOT application.
" +
"OWLViz requires that Graphviz (http://www.graphviz.org/) is installed
" +
" and the path to the DOT application is set properly (in options).";
JOptionPane.showMessageDialog(null, dlgErrMsg, "DOT Error", JOptionPane.ERROR_MESSAGE);
// Display on stderr
//log.error("DOT Process Error:");
//log.error(ioEx.getMessage());
//log.error(errMsg);
return false;
// Display a dialog
//ioEx.printStackTrace();
}
}
/**
* Kills the native dot process (if it was started
* successfully).
*/
protected void killProcess() {
if(process != null) {
process.destroy();
process = null;
}
}
}