public static int executeCommandLine()

in maven-release-manager/src/main/java/org/apache/maven/shared/release/exec/ForkedMavenExecutor.java [169:231]
45 lines of code
10 McCabe index (conditional complexity)

    public static int executeCommandLine(
            Commandline cl, InputStream systemIn, OutputStream systemOut, OutputStream systemErr)
            throws CommandLineException {
        if (cl == null) {
            throw new IllegalArgumentException("cl cannot be null.");
        }

        Process p = cl.execute();

        // processes.put( new Long( cl.getPid() ), p );

        RawStreamPumper inputFeeder = null;

        if (systemIn != null) {
            inputFeeder = new RawStreamPumper(systemIn, p.getOutputStream(), true);
        }

        RawStreamPumper outputPumper = new RawStreamPumper(p.getInputStream(), systemOut);
        RawStreamPumper errorPumper = new RawStreamPumper(p.getErrorStream(), systemErr);

        if (inputFeeder != null) {
            inputFeeder.start();
        }

        outputPumper.start();

        errorPumper.start();

        try {
            int returnValue = p.waitFor();

            if (inputFeeder != null) {
                inputFeeder.setDone();
            }
            outputPumper.setDone();
            errorPumper.setDone();

            // processes.remove( new Long( cl.getPid() ) );

            return returnValue;
        } catch (InterruptedException ex) {
            // killProcess( cl.getPid() );
            throw new CommandLineException("Error while executing external command, process killed.", ex);
        } finally {
            try {
                errorPumper.closeInput();
            } catch (IOException e) {
                // ignore
            }
            try {
                outputPumper.closeInput();
            } catch (IOException e) {
                // ignore
            }
            if (inputFeeder != null) {
                try {
                    inputFeeder.closeOutput();
                } catch (IOException e) {
                    // ignore
                }
            }
        }
    }