/* *   This file is part of MobiMon. * *   MobiMon 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 2 of the License, or *   (at your option) any later version. * *   MobiMon 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 MobiMon; if not, write to the Free Software *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA *//* * MBeanHelper.java * * Created on March 5, 2003, 8:26 AM */package mobimon.mbeans;import java.io.*;import java.nio.*;import java.nio.channels.*;import mobimon.common.*;/** * * @author  jan */public class MBeanHelper {        /** Creates a new instance of MBeanHelper */    public MBeanHelper() {    }        public static byte[] executeCommand(String command) {        byte[] barr = null;        Runtime rt = Runtime.getRuntime();        try {            Process pr = rt.exec(command);            StreamEater eatStdout = new StreamEater(pr.getInputStream());            StreamEater eatStderr = new StreamEater(pr.getErrorStream());            Thread out = new Thread(eatStdout);            Thread err = new Thread(eatStderr);            out.start();            err.start();            int retVal = pr.waitFor();            barr = (retVal == 0) ? eatStdout.getBytes() : eatStderr.getBytes();        } catch (Exception e) {            System.out.println(e.getClass().getName() + ":" + e.getMessage());            barr = null;        }        return barr;    }        public static Page getFileContents(String fileName, int where) {        byte[] fileContents = null;        int pos = Math.abs(where);        Page page = null;        try {            FileInputStream fis = new FileInputStream(fileName);            FileChannel fc = fis.getChannel();            long fileSize = fc.size();            MappedByteBuffer mbb =            fc.map(FileChannel.MapMode.READ_ONLY, 0, fileSize);            if (where > 0) {                if ((pos * Page.SIZE) >= fileSize) {                    pos = (int)(fileSize / Page.SIZE);                    mbb.position(pos * Page.SIZE);                    pos = 0;                } else {                    mbb.position(--pos * Page.SIZE);                    pos = where + 1;                }            } else if (where < 0) {                if ((pos * Page.SIZE) >= fileSize) {                    mbb.position(0);                    pos = 0;                } else {                    mbb.position((int)(fileSize - (pos * Page.SIZE)));                    pos = where - 1;                }            } else {                pos = 0;                mbb.position(0);            }            if (mbb.hasRemaining()) {                fileContents = new byte[Math.min(mbb.remaining(), Page.SIZE)];                mbb.get(fileContents);            }            fc.close();            fis.close();            page = new Page(pos, fileContents);        } catch (IOException ioe) {            page = new Page(0, null);        }        return page;    }}