Java exec exec(List cmd, File binDir, File workDir, boolean parseOutput, boolean tossErrorOutput)

Description

exec

License

Open Source License

Declaration

static String exec(List<String> cmd, File binDir, File workDir, boolean parseOutput, boolean tossErrorOutput)
            throws IOException, InterruptedException 

Method Source Code

//package com.java2s;
/* /*from ww  w  .j a v  a 2s .  co m*/
 * Copyright (c) 2012, Philip DeCamp
 * Released under the BSD 2-Clause License
 * http://opensource.org/licenses/BSD-2-Clause 
 */

import java.io.*;
import java.util.List;

public class Main {
    static String exec(List<String> cmd, File binDir, File workDir, boolean parseOutput, boolean tossErrorOutput)
            throws IOException, InterruptedException {
        String[] cmdp = cmd.toArray(new String[cmd.size()]);
        String[] envp = { "PATH=" + binDir.getAbsolutePath() };
        Process proc = Runtime.getRuntime().exec(cmdp, envp, workDir);

        if (tossErrorOutput) {
            pullStream(proc.getErrorStream());
        }

        try {
            int err = proc.waitFor();
            String msg = null;

            if (err != 0) {
                StringBuilder sb = new StringBuilder();
                for (String c : cmd) {
                    if (sb.length() + c.length() > 50) {
                        sb.append("...");
                        break;
                    }

                    sb.append(c);
                    sb.append(" ");
                }

                msg = "Conversion failed: " + sb.toString();
                System.err.println(msg);

                BufferedReader in = new BufferedReader(new InputStreamReader(proc.getErrorStream()));
                for (String k = in.readLine(); k != null; k = in.readLine()) {
                    System.err.println(k);
                }

                in.close();
            }
        } catch (InterruptedException ex) {
            throw new InterruptedIOException(ex.getMessage());
        }

        StringBuilder s = new StringBuilder();

        if (parseOutput) {
            BufferedReader in = new BufferedReader(new InputStreamReader(proc.getInputStream()));
            for (String k = in.readLine(); k != null; k = in.readLine()) {
                s.append(k);
                s.append("\n");
            }

            in.close();
        }

        return s.toString();
    }

    private static void pullStream(final InputStream s) {
        Thread t = new Thread("Reader thread") {
            byte[] buff = new byte[1024 * 4];

            public void run() {
                try {
                    while (true) {
                        int n = s.read(buff);
                        if (n <= 0) {
                            break;
                        }
                        //System.out.print( new String( buff, 0, n, "UTF-8" ) ); 
                    }
                } catch (Exception ignore) {
                }
            }
        };

        t.setDaemon(true);
        t.setPriority(Thread.MIN_PRIORITY);
        t.start();
    }
}

Related

1. exec(ArrayList args, File path)
2. exec(File dir, String cmd)
3. exec(final String cmd, final String[] args, final byte[] in, final File dir)
4. exec(String args)
5. exec(String cmd)
6. exec(String cmd)
7. exec(String cmd)