/*
Weave (Web-based Analysis and Visualization Environment)
Copyright (C) 2008-2011 University of Massachusetts Lowell
This file is a part of Weave.
Weave is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License, Version 3,
as published by the Free Software Foundation.
Weave 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.
You should have received a copy of the GNU General Public License
along with Weave. If not, see <http://www.gnu.org/licenses/>.
*/
package weave.utils;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
public class CommandUtils
{
public static int runCommand(String[] args) throws IOException
{
return runCommand(args, null, null, false);
}
public static int runCommand(String[] args, boolean debug) throws IOException
{
return runCommand(args, null, null, debug);
}
public static int runCommand(String[] args, String[] envp, File dir) throws IOException
{
return runCommand(args, envp, dir, false);
}
public static int runCommand(String[] args, String[] envp, File dir, boolean debug) throws IOException
{
Runtime run = Runtime.getRuntime();
Process proc = null;
proc = run.exec(args, envp, dir);
BufferedReader stdout = new BufferedReader( new InputStreamReader(proc.getInputStream()) );
BufferedReader stderr = new BufferedReader( new InputStreamReader(proc.getErrorStream()) );
while (true)
{
String line = null;
try
{
// check both streams for new data
if (stdout.ready())
{
if (debug)
line = stdout.readLine();
else
stdout.skip(Long.MAX_VALUE);
}
else if (stderr.ready())
{
if (debug)
line = stderr.readLine();
else
stderr.skip(Long.MAX_VALUE);
}
// print out data from stream
if (line != null)
{
System.out.println(line);
continue;
}
}
catch (IOException ioe)
{
// stream error, get the return value of the process and return from this function
try {
return proc.exitValue();
} catch (IllegalThreadStateException itse) {
return -Integer.MAX_VALUE;
}
}
try
{
// if process finished, return
return proc.exitValue();
}
catch (IllegalThreadStateException itse)
{
// process is still running, continue
}
}
}
}