/*
 * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
 * Copyright (C) $$Year-Rel$$ The Jalview Authors
 * 
 * This file is part of Jalview.
 * 
 * Jalview 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.
 *  
 * Jalview 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 Jalview.  If not, see <http://www.gnu.org/licenses/>.
 * The Jalview Authors are detailed in the 'AUTHORS' file.
 */
package jalview.util;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.GraphicsEnvironment;
import java.awt.Toolkit;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.lang.reflect.Method;
import java.net.URL;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import java.util.Properties;
import java.util.logging.ConsoleHandler;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.swing.SwingUtilities;

import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

import com.stevesoft.pat.Regex;

import jalview.bin.Jalview;
import jalview.javascript.json.JSON;
import swingjs.api.JSUtilI;

/**
 * System platform information used by Applet and Application
 * 
 * @author Jim Procter
 */
public class Platform
{

  private static boolean isJS = /** @j2sNative true || */
          false;

  private static Boolean isNoJSMac = null, isNoJSWin = null, isMac = null,
          isWin = null;

  private static Boolean isHeadless = null;

  private static swingjs.api.JSUtilI jsutil;

  static
  {
    if (isJS)
    {
      try
      {
        // this is ok - it's a highly embedded method in Java; the deprecation
        // is
        // really a recommended best practice.
        jsutil = ((JSUtilI) Class.forName("swingjs.JSUtil").newInstance());
      } catch (InstantiationException | IllegalAccessException
              | ClassNotFoundException e)
      {
        e.printStackTrace();
      }
    }
  }
  // private static Boolean isHeadless = null;

  /**
   * added to group mouse events into Windows and nonWindows (mac, unix, linux)
   * 
   * @return
   */
  public static boolean isMac()
  {
    return (isMac == null
            ? (isMac = (System.getProperty("os.name").indexOf("Mac") >= 0))
            : isMac);
  }

  public static int SHORTCUT_KEY_MASK = (Platform.isMac() ? KeyEvent.META_DOWN_MASK : KeyEvent.CTRL_DOWN_MASK);
 
  static
  {
      // Using non-deprecated Extended key mask modifiers, but Java 8 has no
      // getMenuShortcutKeyMaskEx method
      Toolkit tk = Toolkit.getDefaultToolkit();
      Method method = null;
      try
      {
        method = tk.getClass().getMethod("getMenuShortcutKeyMaskEx");
      } catch (NoSuchMethodException e)
      {
        System.err.println(
                "Could not find Toolkit method getMenuShortcutKeyMaskEx. Trying getMenuShortcutKeyMask.");
      }
      if (method == null)
      {
        try
        {
          method = tk.getClass().getMethod("getMenuShortcutKeyMask");
        } catch (NoSuchMethodException e)
        {
          System.err.println(
                  "Could not find Toolkit method getMenuShortcutKeyMaskEx or getMenuShortcutKeyMask.");
          e.printStackTrace();
        }
      }
      if (method != null)
      {
        try
        {
          method.setAccessible(true);
          SHORTCUT_KEY_MASK = ((int) method.invoke(tk, new Object[0]));
        } catch (Exception e)
        {
          e.printStackTrace();
        }
      }
      if (SHORTCUT_KEY_MASK <= 0xF)
      {
        // shift this into the extended region (was Java 8)
        SHORTCUT_KEY_MASK = SHORTCUT_KEY_MASK << 6;
      }
    }
  }

  /**
   * added to group mouse events into Windows and nonWindows (mac, unix, linux)
   * 
   * @return
   */
  public static boolean isWin()
  {
    return (isWin == null
            ? (isWin = (System.getProperty("os.name").indexOf("Win") >= 0))
            : isWin);
  }

  /**
   * 
   * @return true if HTML5 JavaScript
   */
  public static boolean isJS()
  {
    return isJS;
  }

  /**
   * sorry folks - Macs really are different
   * 
   * BH: disabled for SwingJS -- will need to check key-press issues
   * 
   * @return true if we do things in a special way.
   */
  public static boolean isAMacAndNotJS()
  {
    return (isNoJSMac == null ? (isNoJSMac = !isJS && isMac()) : isNoJSMac);
  }

  /**
   * Check if we are on a Microsoft plaform...
   * 
   * @return true if we have to cope with another platform variation
   */
  public static boolean isWindowsAndNotJS()
  {
    return (isNoJSWin == null ? (isNoJSWin = !isJS && isWin()) : isNoJSWin);
  }

  /**
   *
   * @return true if we are running in non-interactive no UI mode
   */
  public static boolean isHeadless()
  {
    if (isHeadless == null)
    {
      isHeadless = "true".equals(System.getProperty("java.awt.headless"));
    }
    return isHeadless;
  }

  /**
   * 
   * @return nominal maximum command line length for this platform
   */
  public static int getMaxCommandLineLength()
  {
    // TODO: determine nominal limits for most platforms.
    return 2046; // this is the max length for a windows NT system.
  }

  /**
   * Answers the input with every backslash replaced with a double backslash (an
   * 'escaped' single backslash)
   * 
   * @param s
   * @return
   */
  public static String escapeBackslashes(String s)
  {
    return s == null ? null : s.replace("\\", "\\\\");
  }

  /**
   * Answers true if the mouse event has Meta-down (Command key on Mac) or
   * Ctrl-down (on other o/s). Note this answers _false_ if the Ctrl key is
   * pressed instead of the Meta/Cmd key on Mac. To test for Ctrl-pressed on
   * Mac, you can use e.isPopupTrigger().
   * 
   * @param e
   * @return
   */
  public static boolean isControlDown(MouseEvent e)
  {
    return isControlDown(e, isMac());
  }

  /**
   * Overloaded version of method (to allow unit testing)
   * 
   * @param e
   * @param aMac
   * @return
   */
  protected static boolean isControlDown(MouseEvent e, boolean aMac)
  {
//
//    System.out.println(e.isPopupTrigger() 
//            + " " + ((SHORTCUT_KEY_MASK & e.getModifiersEx()) != 0) 
//            + " " + e.isControlDown());
    return (aMac ? !e.isPopupTrigger()
            && (SHORTCUT_KEY_MASK & e.getModifiersEx()) != 0
            : e.isControlDown());
  }

  // BH: I don't know about that previous method. Here is what SwingJS uses.
  // Notice the distinction in mouse events. (BUTTON3_MASK == META)
  //
  // private static boolean isPopupTrigger(int id, int mods, boolean isWin) {
  // boolean rt = ((mods & InputEvent.BUTTON3_MASK) != 0);
  // if (isWin) {
  // if (id != MouseEvent.MOUSE_RELEASED)
  // return false;
  ////
  //// // Oddly, Windows returns InputEvent.META_DOWN_MASK on release, though
  //// // BUTTON3_DOWN_MASK for pressed. So here we just accept both.
  ////
  //// actually, we can use XXX_MASK, not XXX_DOWN_MASK and avoid this issue,
  // because
  //// J2S adds the appropriate extended (0x3FC0) and simple (0x3F) modifiers.
  ////
  // return rt;
  // } else {
  // // mac, linux, unix
  // if (id != MouseEvent.MOUSE_PRESSED)
  // return false;
  // boolean lt = ((mods & InputEvent.BUTTON1_MASK) != 0);
  // boolean ctrl = ((mods & InputEvent.CTRL_MASK) != 0);
  // return rt || (ctrl && lt);
  // }
  // }
  //

  /**
   * Windows (not Mac, Linux, or Unix) and right button to test for the
   * right-mouse pressed event in Windows that would have opened a menu or a
   * Mac.
   * 
   * @param e
   * @return
   */
  public static boolean isWinRightButton(MouseEvent e)
  {
    // was !isAMac(), but that is true also for Linux and Unix and JS,

    return isWin() && SwingUtilities.isRightMouseButton(e);
  }

  /**
   * Windows (not Mac, Linux, or Unix) and middle button -- for mouse wheeling
   * without pressing the button.
   * 
   * @param e
   * @return
   */
  public static boolean isWinMiddleButton(MouseEvent e)
  {
    // was !isAMac(), but that is true also for Linux and Unix and JS
    return isWin() && SwingUtilities.isMiddleMouseButton(e);
  }

  public static boolean allowMnemonics()
  {
    return !isMac();
  }

  public final static int TIME_RESET = 0;

  public final static int TIME_MARK = 1;

  public static final int TIME_SET = 2;

  public static final int TIME_GET = 3;

  public static long time, mark, set, duration;

  /**
   * typical usage:
   * 
   * Platform.timeCheck(null, Platform.TIME_MARK);
   * 
   * ...
   * 
   * Platform.timeCheck("some message", Platform.TIME_MARK);
   * 
   * reset...[set/mark]n...get
   * 
   * @param msg
   * @param mode
   */
  public static void timeCheck(String msg, int mode)
  {
    long t = System.currentTimeMillis();
    switch (mode)
    {
    case TIME_RESET:
      time = mark = t;
      duration = 0;
      if (msg != null)
      {
        System.err.println("Platform: timer reset\t\t\t" + msg);
      }
      break;
    case TIME_MARK:
      if (set > 0)
      {
        // total time between set/mark points
        duration += (t - set);
      }
      else
      {
        if (time == 0)
        {
          time = mark = t;
        }
        if (msg != null)
        {
          System.err.println("Platform: timer mark\t" + ((t - time) / 1000f)
                  + "\t" + ((t - mark) / 1000f) + "\t" + msg);
        }
        mark = t;
      }
      break;
    case TIME_SET:
      set = t;
      break;
    case TIME_GET:
      if (msg != null)
      {
        System.err.println("Platform: timer dur\t" + ((t - time) / 1000f)
                + "\t" + ((duration) / 1000f) + "\t" + msg);
      }
      set = 0;
      break;
    }
  }

  public static void cacheFileData(String path, Object data)
  {
    if (isJS && data != null)
    {
      jsutil.cachePathData(path, data);
    }
  }

  public static void cacheFileData(File file)
  {
    if (isJS)
    {
      byte[] data = Platform.getFileBytes(file);
      {
        if (data != null)
        {
          cacheFileData(file.toString(), data);
        }
      }
    }
  }

  public static byte[] getFileBytes(File f)
  {
    return (isJS && f != null ? jsutil.getBytes(f) : null);
  }

  public static byte[] getFileAsBytes(String fileStr)
  {
    if (isJS && fileStr != null)
    {
      byte[] bytes = (byte[]) jsutil.getFile(fileStr, false);
      cacheFileData(fileStr, bytes);
      return bytes;
    }
    return null;
  }

  public static String getFileAsString(String url)
  {
    if (isJS && url != null)
    {
      String ret = (String) jsutil.getFile(url, true);
      cacheFileData(url, ret);
      return ret;
    }
    return null;
  }

  public static boolean setFileBytes(File f, String urlstring)
  {
    if (isJS && f != null && urlstring != null)
    {
      @SuppressWarnings("unused")
      byte[] bytes = getFileAsBytes(urlstring);
      jsutil.setFileBytes(f, bytes);
      return true;
    }
    return false;
  }

  public static void addJ2SBinaryType(String ext)
  {
    if (isJS)
    {
      jsutil.addBinaryFileType(ext);
    }
  }

  /**
   * Encode the URI using JavaScript encodeURIComponent
   * 
   * @param value
   * @return encoded value
   */
  public static String encodeURI(String value)
  {
    /**
     * @j2sNative value = encodeURIComponent(value);
     */
    return value;
  }

  /**
   * Open the URL using a simple window call if this is JavaScript
   * 
   * @param url
   * @return true if window has been opened
   */
  public static boolean openURL(String url) throws IOException
  {
    if (!isJS())
    {
      return false;
    }
    /**
     * @j2sNative
     * 
     * 
     *            window.open(url);
     */
    return true;
  }

  public static String getUniqueAppletID()
  {
    return (isJS ? (String) jsutil.getAppletAttribute("_uniqueId") : null);
  }

  /**
   * Read the Info block for this applet.
   * 
   * @param prefix
   *          "jalview_"
   * @param p
   * @return unique id for this applet
   */
  public static void readInfoProperties(String prefix, Properties p)
  {
    if (isJS)
    {
      String id = getUniqueAppletID();

      String key = "";
      String value = "";
      @SuppressWarnings("unused")
      Object info = jsutil.getAppletAttribute("__Info");
      /**
       * @j2sNative for (key in info) { value = info[key];
       */

      if (key.indexOf(prefix) == 0)
      {
        System.out.println("Platform id=" + id + " reading Info." + key
                + " = " + value);
        p.put(key, value);

      }

      /**
       * @j2sNative }
       */
    }
  }

  public static void setAjaxJSON(URL url)
  {
    if (isJS())
    {
      JSON.setAjax(url);
    }
  }

  public static Object parseJSON(InputStream response)
          throws IOException, ParseException
  {
    if (isJS())
    {
      return JSON.parse(response);
    }

    BufferedReader br = null;
    try
    {
      br = new BufferedReader(new InputStreamReader(response, "UTF-8"));
      return new JSONParser().parse(br);
    } finally
    {
      if (br != null)
      {
        try
        {
          br.close();
        } catch (IOException e)
        {
          // ignore
        }
      }
    }
  }

  public static Object parseJSON(String json) throws ParseException
  {
    return (isJS() ? JSON.parse(json) : new JSONParser().parse(json));
  }

  public static Object parseJSON(Reader r)
          throws IOException, ParseException
  {
    if (r == null)
    {
      return null;
    }

    if (!isJS())
    {
      return new JSONParser().parse(r);
    }
    // Using a file reader is not currently supported in SwingJS JavaScript

    if (r instanceof FileReader)
    {
      throw new IOException(
              "StringJS does not support FileReader parsing for JSON -- but it could...");
    }
    return JSON.parse(r);
  }

  /**
   * Dump the input stream to an output file.
   * 
   * @param is
   * @param outFile
   * @throws IOException
   *           if the file cannot be created or there is a problem reading the
   *           input stream.
   */
  public static void streamToFile(InputStream is, File outFile)
          throws IOException
  {

    if (isJS)
    {
      jsutil.setFileBytes(outFile, is);
      return;
    }

    FileOutputStream fio = new FileOutputStream(outFile);
    try
    {
      byte[] bb = new byte[32 * 1024];
      int l;
      while ((l = is.read(bb)) > 0)
      {
        fio.write(bb, 0, l);
      }
    } finally
    {
      fio.close();
    }
  }

  /**
   * Add a known domain that implements access-control-allow-origin:*
   * 
   * These should be reviewed periodically.
   * 
   * @param domain
   *          for a service that is not allowing ajax
   * 
   * @author hansonr@stolaf.edu
   * 
   */
  public static void addJ2SDirectDatabaseCall(String domain)
  {

    if (isJS)
    {
      jsutil.addDirectDatabaseCall(domain);

      System.out.println(
              "Platform adding known access-control-allow-origin * for domain "
                      + domain);
    }

  }

  /**
   * Allow for URL-line command arguments. Untested.
   * 
   */
  public static void getURLCommandArguments()
  {

    try {
    /**
     * Retrieve the first query field as command arguments to Jalview. Include
     * only if prior to "?j2s" or "&j2s" or "#". Assign the applet's __Info.args
     * element to this value.
     * 
     * @j2sNative var a =
     *            decodeURI((document.location.href.replace("&","?").split("?j2s")[0]
     *            + "?").split("?")[1].split("#")[0]); a &&
     *            (J2S.thisApplet.__Info.args = a.split(" "));
     *            
     *            System.out.println("URL arguments: " + a);
     */
    } catch (Throwable t) {
    }
  }

  /**
   * A (case sensitive) file path comparator that ignores the difference between
   * / and \
   * 
   * @param path1
   * @param path2
   * @return
   */
  public static boolean pathEquals(String path1, String path2)
  {
    if (path1 == null)
    {
      return path2 == null;
    }
    if (path2 == null)
    {
      return false;
    }
    String p1 = path1.replace('\\', '/');
    String p2 = path2.replace('\\', '/');
    return p1.equals(p2);
  }

  ///////////// JAL-3253 Applet additions //////////////

  /**
   * Retrieve the object's embedded size from a div's style on a page if
   * embedded in SwingJS.
   * 
   * @param frame
   *          JFrame or JInternalFrame
   * @param defaultWidth
   *          use -1 to return null (no default size)
   * @param defaultHeight
   * @return the embedded dimensions or null (no default size or not embedded)
   */
  public static Dimension getDimIfEmbedded(Component frame,
          int defaultWidth, int defaultHeight)
  {
    Dimension d = null;
    if (isJS)
    {
      d = (Dimension) getEmbeddedAttribute(frame, "dim");
    }
    return (d == null && defaultWidth >= 0
            ? new Dimension(defaultWidth, defaultHeight)
            : d);

  }

  public static Regex newRegex(String regex)
  {
    return newRegex(regex, null);
  }

  public static Regex newRegex(String searchString, String replaceString)
  {
    ensureRegex();
    return (replaceString == null ? new Regex(searchString)
            : new Regex(searchString, replaceString));
  }

  public static Regex newRegexPerl(String code)
  {
    ensureRegex();
    return Regex.perlCode(code);
  }

  /**
   * Initialize Java debug logging. A representative sample -- adapt as desired.
   */
  public static void startJavaLogging()
  {
    /**
     * @j2sIgnore
     */
    {
      logClass("java.awt.EventDispatchThread", "java.awt.EventQueue",
              "java.awt.Component", "java.awt.focus.Component",
              "java.awt.event.Component",
              "java.awt.focus.DefaultKeyboardFocusManager");
    }
  }

  /**
   * Initiate Java logging for a given class. Only for Java, not JavaScript;
   * Allows debugging of complex event processing.
   * 
   * @param className
   */
  public static void logClass(String... classNames)
  {
    /**
     * @j2sIgnore
     * 
     * 
     */
    {
      Logger rootLogger = Logger.getLogger("");
      rootLogger.setLevel(Level.ALL);
      ConsoleHandler consoleHandler = new ConsoleHandler();
      consoleHandler.setLevel(Level.ALL);
      for (int i = classNames.length; --i >= 0;)
      {
        Logger logger = Logger.getLogger(classNames[i]);
        logger.setLevel(Level.ALL);
        logger.addHandler(consoleHandler);
      }
    }
  }

  /**
   * load a resource -- probably a core file -- if and only if a particular
   * class has not been instantialized. We use a String here because if we used
   * a .class object, that reference itself would simply load the class, and we
   * want the core package to include that as well.
   * 
   * @param resourcePath
   * @param className
   */
  public static void loadStaticResource(String resourcePath,
          String className)
  {
    if (isJS)
    {
      jsutil.loadResourceIfClassUnknown(resourcePath, className);
    }
  }

  public static void ensureRegex()
  {
    if (isJS)
    {
      loadStaticResource("core/core_stevesoft.z.js",
              "com.stevesoft.pat.Regex");
    }
  }

  /**
   * Set the "app" property of the HTML5 applet object, for example,
   * "testApplet.app", to point to the Jalview instance. This will be the object
   * that page developers use that is similar to the original Java applet object
   * that was accessed via LiveConnect.
   * 
   * @param j
   */
  public static void setAppClass(Object j)
  {
    if (isJS)
    {
      jsutil.setAppClass(j);
    }
  }

  /**
   *
   * If this frame is embedded in a web page, return a known type.
   * 
   * @param frame
   *          a JFrame or JInternalFrame
   * @param type "name", "node", "init", "dim", or any DOM attribute, such as "id"
   * @return null if frame is not embedded.
   */
  public static Object getEmbeddedAttribute(Component frame, String type)
  {
    return (isJS ? jsutil.getEmbeddedAttribute(frame, type) : null);
  }

  public static void stackTrace()
  {
    try
    {
      throw new NullPointerException();
    } catch (Exception e)
    {
      e.printStackTrace();
    }

  }

  public static URL getDocumentBase()
  {
    return (isJS ? jsutil.getDocumentBase() : null);
  }

  public static URL getCodeBase()
  {
    return (isJS ? jsutil.getCodeBase() : null);
  }

  public static String getUserPath(String subpath)
  {
    char sep = File.separatorChar;
    return System.getProperty("user.home") + sep
            + subpath.replace('/', sep);
  }

  /**
   * This method enables checking if a cached file has exceeded a certain
   * threshold(in days)
   * 
   * @param file
   *          the cached file
   * @param noOfDays
   *          the threshold in days
   * @return
   */
  public static boolean isFileOlderThanThreshold(File file, int noOfDays)
  {
    if (isJS())
    {
      // not meaningful in SwingJS -- this is a session-specific temp file. It
      // doesn't have a timestamp.
      return false;
    }
    Path filePath = file.toPath();
    BasicFileAttributes attr;
    int diffInDays = 0;
    try
    {
      attr = Files.readAttributes(filePath, BasicFileAttributes.class);
      diffInDays = (int) ((new Date().getTime()
              - attr.lastModifiedTime().toMillis())
              / (1000 * 60 * 60 * 24));
      // System.out.println("Diff in days : " + diffInDays);
    } catch (IOException e)
    {
      e.printStackTrace();
    }
    return noOfDays <= diffInDays;
  }

  /**
   * Get the leading integer part of a string that begins with an integer.
   * 
   * @param input
   *          - the string input to process
   * @param failValue
   *          - value returned if unsuccessful
   * @return
   */
  public static int getLeadingIntegerValue(String input, int failValue)
  {
    if (input == null)
    {
      return failValue;
    }
    if (isJS)
    {
      int val = /** @j2sNative 1 ? parseInt(input) : */
              0;
      return (val == val + 0 ? val : failValue);
    }
    // JavaScript does not support Regex ? lookahead
    String[] parts = input.split("(?=\\D)(?<=\\d)");
    if (parts != null && parts.length > 0 && parts[0].matches("[0-9]+"))
    {
      return Integer.valueOf(parts[0]);
    }
    return failValue;
  }

  public static Map<String, Object> getAppletInfoAsMap()
  {
    return (isJS ? jsutil.getAppletInfoAsMap() : null);
  }

  /**
   * Get the SwingJS applet ID and combine that with the frameType
   * 
   * @param frameType
   *          "alignment", "desktop", etc., or null
   * @return
   */
  public static String getAppID(String frameType)
  {
    
    String id = Jalview.getInstance().j2sAppletID;
    if (id == null)
    {
      Jalview.getInstance().j2sAppletID = id = (isJS ? (String) jsutil
              .getAppletAttribute("_id") : "jalview");
    }
    return id + (frameType == null ? "" : "-" + frameType);
  }


  /**
   * Option to avoid unnecessary seeking of nonexistent resources in JavaScript.
   * Works in Java as well.
   * 
   * @param loc
   * @return
   */
  public static Locale getLocaleOrNone(Locale loc)
  {
    return (isJS && loc.getLanguage() == "en" ? new Locale("") : loc);
  }

  /**
   * From UrlDownloadClient; trivial in JavaScript; painful in Java.
   * 
   * @param urlstring
   * @param outfile
   * @throws IOException
   */
  public static void download(String urlstring, String outfile)
          throws IOException
  {
    Path temp = null;
    try (InputStream is = new URL(urlstring).openStream())
    {
      if (isJS)
      { // so much easier!
        streamToFile(is, new File(outfile));
        return;
      }
      temp = Files.createTempFile(".jalview_", ".tmp");
      try (FileOutputStream fos = new FileOutputStream(temp.toString());
              ReadableByteChannel rbc = Channels.newChannel(is))
      {
        fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
        // copy tempfile to outfile once our download completes
        // incase something goes wrong
        Files.copy(temp, Paths.get(outfile),
                StandardCopyOption.REPLACE_EXISTING);
      }
    } catch (IOException e)
    {
      throw e;
    } finally
    {
      try
      {
        if (temp != null)
        {
          Files.deleteIfExists(temp);
        }
      } catch (IOException e)
      {
        System.out.println("Exception while deleting download temp file: "
                + e.getMessage());
      }
    }
  }

}