/**
* Copyright (C) 2005 - 2009 Eric Van Dewoestine
*
* 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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.eclim.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
/**
* Runs an external process.
*
* @author Eric Van Dewoestine
*/
public class CommandExecutor
implements Runnable
{
private int returnCode = -1;
private String[] cmd;
private String result;
private String error;
private Process process;
/**
* Construct a new instance.
*/
private CommandExecutor (String[] cmd)
{
this.cmd = cmd;
}
/**
* Execute the supplied command.
*
* @param cmd The command to execute.
* @return The CommandExecutor instance containing the ending state of the
* process.
*/
public static CommandExecutor execute(String[] cmd)
throws Exception
{
return execute(cmd, -1);
}
/**
* Execute the supplied command.
*
* @param cmd The command to execute.
* @param timeout Timeout in milliseconds.
* @return The CommandExecutor instance containing the ending state of the
* process.
*/
public static CommandExecutor execute(String[] cmd, long timeout)
throws Exception
{
CommandExecutor executor = new CommandExecutor(cmd);
Thread thread = new Thread(executor);
thread.start();
if(timeout > 0){
thread.join(timeout);
}else{
thread.join();
}
return executor;
}
/**
* Run the thread.
*/
public void run()
{
try{
Runtime runtime = Runtime.getRuntime();
process = runtime.exec(cmd);
final ByteArrayOutputStream out = new ByteArrayOutputStream();
final ByteArrayOutputStream err = new ByteArrayOutputStream();
Thread outThread = new Thread(){
public void run()
{
try{
IOUtils.copy(process.getInputStream(), out);
}catch(IOException ioe){
ioe.printStackTrace();
}
}
};
outThread.start();
Thread errThread = new Thread(){
public void run()
{
try{
IOUtils.copy(process.getErrorStream(), err);
}catch(IOException ioe){
ioe.printStackTrace();
}
}
};
errThread.start();
returnCode = process.waitFor();
outThread.join(1000);
errThread.join(1000);
result = out.toString();
error = err.toString();
}catch(Exception e){
returnCode = 12;
error = e.getMessage();
e.printStackTrace();
}
}
/**
* Destroy this process.
*/
public void destroy()
{
if(process != null){
process.destroy();
}
}
/**
* Gets the output of the command.
*
* @return The command result.
*/
public String getResult()
{
return result;
}
/**
* Get the return code from the process.
*
* @return The return code.
*/
public int getReturnCode()
{
return returnCode;
}
/**
* Gets the error message from the command if there was one.
*
* @return The possibly empty error message.
*/
public String getErrorMessage()
{
return error;
}
}