/************************************************************************
    * Copyright (c) 2000-2006 The Apache Software Foundation.             *
    * All rights reserved.                                                *
    * ------------------------------------------------------------------- *
    * Licensed under the Apache License, Version 2.0 (the "License"); you *
    * may not use this file except in compliance with the License. You    *
    * may obtain a copy of the License at:                                *
    *                                                                     *
    *     http://www.apache.org/licenses/LICENSE-2.0                      *
   *                                                                     *
   * Unless required by applicable law or agreed to in writing, software *
   * distributed under the License is distributed on an "AS IS" BASIS,   *
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or     *
   * implied.  See the License for the specific language governing       *
   * permissions and limitations under the License.                      *
   ***********************************************************************/
  
  /* TODO:
   *
   * 1. Currently, iterating through the message collection does not
   *    preserve the order in the file.  Change this with some form of
   *    OrderedMap.  There is a suitable class in Jakarta Commons
   *    Collections.
   *
   * 2. Optimize the remove operation.
   *
   * 3. Don't load entire message into memory.  This would mean computing
   *    the hash during I/O streaming, rather than loading entire message
   *    into memory, and using a MimeMessageWrapper with a suitable data
   *    source.  As a strawman, the interface to MessageAction would
   *    carry the hash, along with a size-limited stream providing the
   *    message body.
   *
   * 4. Decide what to do when there are IDENTICAL messages in the file.
   *    Right now only the last one will ever be processed, due to key
   *    collissions.
   *
   * 5. isComplete()  - DONE.
   *
   * 6. Buffered I/O. - Partially done, and optional.
   *
   */
  
  package org.apache.james.mailrepository;
  
  import org.apache.avalon.framework.activity.Initializable;
  import org.apache.avalon.framework.service.ServiceException;
  import org.apache.avalon.framework.service.ServiceManager;
  import org.apache.avalon.framework.service.Serviceable;
  import org.apache.avalon.framework.configuration.Configurable;
  import org.apache.avalon.framework.configuration.Configuration;
  import org.apache.avalon.framework.configuration.ConfigurationException;
  import org.apache.avalon.framework.logger.AbstractLogEnabled;
  import org.apache.james.core.MailImpl;
  import org.apache.james.services.MailRepository;
  import org.apache.mailet.Mail;
  import org.apache.oro.text.regex.MalformedPatternException;
  import org.apache.oro.text.regex.Perl5Compiler;
  import org.apache.oro.text.regex.Pattern;
  import org.apache.oro.text.regex.Perl5Matcher;
  
  import javax.mail.MessagingException;
  import javax.mail.Session;
  import javax.mail.internet.MimeMessage;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.RandomAccessFile;
  import java.security.NoSuchAlgorithmException;
  import java.security.MessageDigest;
  import java.text.SimpleDateFormat;
  import java.util.ArrayList;
  import java.util.Calendar;
  import java.util.Collection;
  import java.util.Hashtable;
  import java.util.Iterator;
  import java.util.Locale;
  import java.util.Properties;
  import java.util.Vector;
  
  /***
   * Implementation of a MailRepository using UNIX mbox files.
   *
   * <p>Requires a configuration element in the .conf.xml file of the form:
   *  <br>&lt;repository destinationURL="mbox://&lt;directory&gt;"
   *  <br>            type="MAIL"
   *  <br>&lt;/directory&gt; is where the individual mbox files are read from/written to
   * <br>Type can ONLY be MAIL (SPOOL is NOT supported)
   *
   * <p>Requires a logger called MailRepository.
   *
   * <p> Implementation notes:
   * <p>
   * This class keeps an internal store of the mbox file
   * When the internal mbox file is updated (added/deleted)
   * then the file will be re-read from disk and then written back.
  * This is a bit inefficent but means that the file on disk
  * should be correct.
  * <p>
  * The mbox store is mainly meant to be used as a one-way street.
  * Storing new emails is very fast (append to file) whereas reading them (via POP3) is
  * slower (read from disk and parse).
  * Therefore this implementation is best suited to people who wish to use the mbox format
  * for taking data out of James and into something else (IMAP server or mail list displayer)
  *
  * @version CVS $Revision: 454176 $
  */
 
 
 public class MBoxMailRepository
         extends AbstractLogEnabled
             implements MailRepository, Serviceable, Configurable, Initializable {
 
 
     static final SimpleDateFormat dy = new SimpleDateFormat("EE MMM dd HH:mm:ss yyyy", Locale.US);
     static final String LOCKEXT = ".lock";
     static final String WORKEXT = ".work";
     static final int LOCKSLEEPDELAY = 2000; // 2 second back off in the event of a problem with the lock file
     static final int MAXSLEEPTIMES = 100; //
     static final long MLISTPRESIZEFACTOR = 10 * 1024;  // The hash table will be loaded with a initial capacity of  filelength/MLISTPRESIZEFACTOR
     static final long DEFAULTMLISTCAPACITY = 20; // Set up a hashtable to have a meaningful default
 
     /***
      * Whether line buffering is turned used.
      */
     private static boolean BUFFERING = true;
 
     /***
      * Whether 'deep debugging' is turned on.
      */
     private static final boolean DEEP_DEBUG = true;
 
     /***
      * The internal list of the emails
      * The key is an adapted MD5 checksum of the mail
      */
     private Hashtable mList = null;
     /***
      * The filename to read & write the mbox from/to
      */
     private String mboxFile;
 
     /***
      * A callback used when a message is read from the mbox file
      */
     public interface MessageAction {
         public boolean isComplete();  // *** Not valid until AFTER each call to messageAction(...)!
         public MimeMessage messageAction(String messageSeparator, String bodyText, long messageStart);
     }
 
 
     /***
      * Convert a MimeMessage into raw text
      * @param mc The mime message to convert
      * @return A string representation of the mime message
      * @throws IOException
      * @throws MessagingException
      */
     private String getRawMessage(MimeMessage mc) throws IOException, MessagingException {
 
         ByteArrayOutputStream rawMessage = new ByteArrayOutputStream();
         mc.writeTo(rawMessage);
         return rawMessage.toString();
     }
 
     /***
      * Parse a text block as an email and convert it into a mime message
      * @param emailBody The headers and body of an email. This will be parsed into a mime message and stored
      */
     private MimeMessage convertTextToMimeMessage(String emailBody) {
         //this.emailBody = emailBody;
         MimeMessage mimeMessage = null;
         // Parse the mime message as we have the full message now (in string format)
         ByteArrayInputStream mb = new ByteArrayInputStream(emailBody.getBytes());
         Properties props = System.getProperties();
         Session session = Session.getDefaultInstance(props);
         try {
             mimeMessage = new MimeMessage(session, mb);
 
 
         } catch (MessagingException e) {
             getLogger().error("Unable to parse mime message!", e);
         }
 
         if (mimeMessage == null && getLogger().isDebugEnabled()) {
             StringBuffer logBuffer =
                     new StringBuffer(128)
                     .append(this.getClass().getName())
                     .append(" Mime message is null");
             getLogger().debug(logBuffer.toString());
         }
 
         /*
         String toAddr = null;
         try {
             // Attempt to read the TO field and see if it errors
             toAddr = mimeMessage.getRecipients(javax.mail.Message.RecipientType.TO).toString();
         } catch (Exception e) {
             // It has errored, so time for plan B
             // use the from field I suppose
             try {
                 mimeMessage.setRecipients(javax.mail.Message.RecipientType.TO, mimeMessage.getFrom());
                 if (getLogger().isDebugEnabled()) {
                     StringBuffer logBuffer =
                             new StringBuffer(128)
                             .append(this.getClass().getName())
                             .append(" Patching To: field for message ")
                             .append(" with  From: field");
                     getLogger().debug(logBuffer.toString());
                 }
             } catch (MessagingException e1) {
                 getLogger().error("Unable to set to: field to from: field", e);
             }
         } */
         return mimeMessage;
     }
 
     /***
      * Generate a hex representation of an MD5 checksum on the emailbody
      * @param emailBody
      * @return A hex representation of the text
      * @throws NoSuchAlgorithmException
      */
     private String generateKeyValue(String emailBody) throws NoSuchAlgorithmException {
         // MD5 the email body for a reilable (ha ha) key
         byte[] digArray = MessageDigest.getInstance("MD5").digest(emailBody.getBytes());
         StringBuffer digest = new StringBuffer();
         for (int i = 0; i < digArray.length; i++) {
             digest.append(Integer.toString(digArray[i], Character.MAX_RADIX).toUpperCase(Locale.US));
         }
         return digest.toString();
     }
 
     /***
      * Parse the mbox file.
      * @param ins The random access file to load. Note that the file may or may not start at offset 0 in the file
      * @param messAct The action to take when a message is found
      */
     private MimeMessage parseMboxFile(RandomAccessFile ins, MessageAction messAct) {
         if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
             StringBuffer logBuffer =
                     new StringBuffer(128)
                     .append(this.getClass().getName())
                     .append(" Start parsing ")
                     .append(mboxFile);
 
             getLogger().debug(logBuffer.toString());
         }
         try {
 
             Perl5Compiler sepMatchCompiler = new Perl5Compiler();
             Pattern sepMatchPattern = sepMatchCompiler.compile("^From (.*) (.*):(.*):(.*)$");
             Perl5Matcher sepMatch = new Perl5Matcher();
 
             int c;
             boolean inMessage = false;
             StringBuffer messageBuffer = new StringBuffer();
             String previousMessageSeparator = null;
             boolean foundSep = false;
 
             long prevMessageStart = ins.getFilePointer();
             if (BUFFERING) {
             String line = null;
             while ((line = ins.readLine()) != null) {
                 foundSep = sepMatch.contains(line + "\n", sepMatchPattern);
 
                 if (foundSep && inMessage) {
 //                    if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
 //                        getLogger().debug(this.getClass().getName() + " Invoking " + messAct.getClass() + " at " + prevMessageStart);
 //                    }
                     MimeMessage endResult = messAct.messageAction(previousMessageSeparator, messageBuffer.toString(), prevMessageStart);
                     if (messAct.isComplete()) {
                         // I've got what I want so just exit
                         return endResult;
                     }
                     previousMessageSeparator = line;
                     prevMessageStart = ins.getFilePointer() - line.length();
                     messageBuffer = new StringBuffer();
                     inMessage = true;
                 }
                 // Only done at the start (first header)
                 if (foundSep && !inMessage) {
                     previousMessageSeparator = line.toString();
                     inMessage = true;
                 }
                 if (!foundSep && inMessage) {
                     messageBuffer.append(line).append("\n");
                 }
             }
             } else {
             StringBuffer line = new StringBuffer();
             while ((c = ins.read()) != -1) {
                 if (c == 10) {
                     foundSep = sepMatch.contains(line.toString(), sepMatchPattern);
                     if (foundSep && inMessage) {
 //                        if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
 //                            getLogger().debug(this.getClass().getName() + " Invoking " + messAct.getClass() + " at " + prevMessageStart);
 //                        }
                         MimeMessage endResult = messAct.messageAction(previousMessageSeparator, messageBuffer.toString(), prevMessageStart);
                         if (messAct.isComplete()) {
                             // I've got what I want so just exit
                             return endResult;
                         }
                         previousMessageSeparator = line.toString();
                         prevMessageStart = ins.getFilePointer() - line.length();
                         messageBuffer = new StringBuffer();
                         inMessage = true;
                     }
                     // Only done at the start (first header)
                     if (foundSep && inMessage == false) {
                         previousMessageSeparator = line.toString();
                         inMessage = true;
                     }
                     if (!foundSep) {
                         messageBuffer.append(line).append((char) c);
                     }
                     line = new StringBuffer(); // Reset buffer
                 } else {
                     line.append((char) c);
                 }
             }
             }
 
             if (messageBuffer.length() != 0) {
                 // process last message
                 return messAct.messageAction(previousMessageSeparator, messageBuffer.toString(), prevMessageStart);
             }
         } catch (IOException ioEx) {
             getLogger().error("Unable to write file (General I/O problem) " + mboxFile, ioEx);
         } catch (MalformedPatternException e) {
             getLogger().error("Bad regex passed " + mboxFile, e);
         } finally {
             if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
                 StringBuffer logBuffer =
                         new StringBuffer(128)
                         .append(this.getClass().getName())
                         .append(" Finished parsing ")
                         .append(mboxFile);
 
                 getLogger().debug(logBuffer.toString());
             }
         }
         return null;
     }
 
     /***
      * Find a given message
      * This method will first use selectMessage(key) to see if the key/offset combination allows us to skip
      * parts of the file and only load the message we are interested in
      *
      * @param key The key of the message to find
      */
     private MimeMessage findMessage(String key) {
         MimeMessage foundMessage = null;
 
         // See if we can get the message by using the cache position first
         foundMessage = selectMessage(key);
         if (foundMessage == null) {
             // If the message is not found something has changed from
             // the cache.  The cache may have been invalidated by
             // another method, or the file may have been replaced from
             // underneath us.  Reload the cache, and try again.
             mList = null;
             loadKeys();
             foundMessage = selectMessage(key);
         }
         return foundMessage;
     }
 
     /***
      * Quickly find a message by using the stored message offsets
      * @param key  The key of the message to find
      */
     private MimeMessage selectMessage(final String key) {
         MimeMessage foundMessage = null;
         // Can we find the key first
         if (mList == null || !mList.containsKey(key)) {
             // Not initiailised so no point looking
             if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
                 StringBuffer logBuffer =
                         new StringBuffer(128)
                         .append(this.getClass().getName())
                         .append(" mList - key not found ")
                         .append(mboxFile);
 
                 getLogger().debug(logBuffer.toString());
             }
             return foundMessage;
         }
         long messageStart = ((Long) mList.get(key)).longValue();
         if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
             StringBuffer logBuffer =
                     new StringBuffer(128)
                     .append(this.getClass().getName())
                     .append(" Load message starting at offset ")
                     .append(messageStart)
                     .append(" from file ")
                     .append(mboxFile);
 
             getLogger().debug(logBuffer.toString());
         }
         // Now try and find the position in the file
         RandomAccessFile ins = null;
         try {
             ins = new RandomAccessFile(mboxFile, "r");
             if (messageStart != 0) {
                 ins.seek(messageStart - 1);
             }
             MessageAction op = new MessageAction() {
                 public boolean isComplete() { return true; }
                 public MimeMessage messageAction(String messageSeparator, String bodyText, long messageStart) {
                     try {
                         if (key.equals(generateKeyValue(bodyText))) {
                             getLogger().debug(this.getClass().getName() + " Located message. Returning MIME message");
                             return convertTextToMimeMessage(bodyText);
                         }
                     } catch (NoSuchAlgorithmException e) {
                         getLogger().error("MD5 not supported! ",e);
                     }
                     return null;
                 }
             };
             foundMessage = this.parseMboxFile(ins, op);
         } catch (FileNotFoundException e) {
             getLogger().error("Unable to save(open) file (File not found) " + mboxFile, e);
         } catch (IOException e) {
             getLogger().error("Unable to write file (General I/O problem) " + mboxFile, e);
         } finally {
             if (foundMessage == null) {
                 if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
                     StringBuffer logBuffer =
                             new StringBuffer(128)
                             .append(this.getClass().getName())
                             .append(" select - message not found ")
                             .append(mboxFile);
 
                     getLogger().debug(logBuffer.toString());
                 }
             }
             if (ins != null) try { ins.close(); } catch (IOException e) { getLogger().error("Unable to close file (General I/O problem) " + mboxFile, e); }
         }
         return foundMessage;
     }
 
     /***
      * Load the message keys and file pointer offsets from disk
      */
     private synchronized void loadKeys() {
         if (mList!=null) {
             return;
         }
         RandomAccessFile ins = null;
         try {
             ins = new RandomAccessFile(mboxFile, "r");
             long initialCapacity = (ins.length() >  MLISTPRESIZEFACTOR ? ins.length() /MLISTPRESIZEFACTOR  : 0);
             if (initialCapacity < DEFAULTMLISTCAPACITY ) {
                 initialCapacity =  DEFAULTMLISTCAPACITY;
             }
             if (initialCapacity > Integer.MAX_VALUE) {
                 initialCapacity = Integer.MAX_VALUE - 1;
             }
             this.mList = new Hashtable((int)initialCapacity);
             this.parseMboxFile(ins, new MessageAction() {
                 public boolean isComplete() { return false; }
                 public MimeMessage messageAction(String messageSeparator, String bodyText, long messageStart) {
                     try {
                         String key = generateKeyValue(bodyText);
                         mList.put(key, new Long(messageStart));
                         if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
                             getLogger().debug(this.getClass().getName() + " Key " + key + " at " + messageStart);
                         }
                         
                     } catch (NoSuchAlgorithmException e) {
                         getLogger().error("MD5 not supported! ",e);
                     }
                     return null;
                 }
             });
             //System.out.println("Done Load keys!");
         } catch (FileNotFoundException e) {
             getLogger().error("Unable to save(open) file (File not found) " + mboxFile, e);
             this.mList = new Hashtable((int)DEFAULTMLISTCAPACITY);
         } catch (IOException e) {
             getLogger().error("Unable to write file (General I/O problem) " + mboxFile, e);
         } finally {
             if (ins != null) try { ins.close(); } catch (IOException e) { getLogger().error("Unable to close file (General I/O problem) " + mboxFile, e); }
         }
     }
 
 
     /***
      * Store the given email in the current mbox file
      * @param mc The mail to store
      */
     public void store(Mail mc) {
 
         if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
             StringBuffer logBuffer =
                     new StringBuffer(128)
                     .append(this.getClass().getName())
                     .append(" Will store message to file ")
                     .append(mboxFile);
 
             getLogger().debug(logBuffer.toString());
         }
         this.mList = null;
         // Now make up the from header
         String fromHeader = null;
         String message = null;
         try {
             message = getRawMessage(mc.getMessage());
             // check for nullsender
             if (mc.getMessage().getFrom() == null) {
                 fromHeader = "From   " + dy.format(Calendar.getInstance().getTime());
             } else {
                 fromHeader = "From " + mc.getMessage().getFrom()[0] + " " + dy.format(Calendar.getInstance().getTime());
             }
             
         } catch (IOException e) {
             getLogger().error("Unable to parse mime message for " + mboxFile, e);
         } catch (MessagingException e) {
             getLogger().error("Unable to parse mime message for " + mboxFile, e);
         }
         // And save only the new stuff to disk
         RandomAccessFile saveFile = null;
         try {
             saveFile = new RandomAccessFile(mboxFile, "rw");
             saveFile.seek(saveFile.length()); // Move to the end
             saveFile.writeBytes((fromHeader + "\n"));
             saveFile.writeBytes((message + "\n"));
             saveFile.close();
 
         } catch (FileNotFoundException e) {
             getLogger().error("Unable to save(open) file (File not found) " + mboxFile, e);
         } catch (IOException e) {
             getLogger().error("Unable to write file (General I/O problem) " + mboxFile, e);
         }
     }
 
     /***
      * Return the list of the current messages' keys
      * @return A list of the keys of the emails currently loaded
      */
     public Iterator list() {
         loadKeys();
         
         if (mList.keySet().isEmpty() == false) {
             // find the first message.  This is a trick to make sure that if
             // the file is changed out from under us, we will detect it and
             // correct for it BEFORE we return the iterator.
             findMessage((String) mList.keySet().iterator().next());
         }
         if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
             StringBuffer logBuffer =
                     new StringBuffer(128)
                     .append(this.getClass().getName())
                     .append(" ")
                     .append(mList.size())
                     .append(" keys to be iterated over.");
 
             getLogger().debug(logBuffer.toString());
         }
         return mList.keySet().iterator();
     }
 
     /***
      * Get a message from the backing store (disk)
      * @param key
      * @return The mail found from the key. Returns null if the key is not found
      */
     public Mail retrieve(String key) {
 
         loadKeys();
         MailImpl res = null;
         try {
             MimeMessage foundMessage = findMessage(key);
             if (foundMessage == null) {
                 getLogger().error("found message is null!");
                 return null;
             }
             res = new MailImpl(foundMessage);
             res.setName(key);
             if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
                 StringBuffer logBuffer =
                         new StringBuffer(128)
                         .append(this.getClass().getName())
                         .append(" Retrieving entry for key ")
                         .append(key);
 
                 getLogger().debug(logBuffer.toString());
             }
         } catch (MessagingException e) {
             getLogger().error("Unable to parse mime message for " + mboxFile + "\n" + e.getMessage(), e);
         }
         return res;
     }
 
     /***
      * Remove an existing message
      * @param mail
      */
     public void remove(Mail mail) {
         // Convert the message into a key
         Vector delVec = new Vector();
         delVec.addElement(mail);
         remove(delVec);
     }
 
     /***
      * Attempt to get a lock on the mbox by creating
      * the file mboxname.lock
      * @throws Exception
      */
     private void lockMBox() throws Exception {
         // Create the lock file (if possible)
         String lockFileName = mboxFile + LOCKEXT;
         int sleepCount = 0;
         File mBoxLock = new File(lockFileName);
         if (!mBoxLock.createNewFile()) {
             // This is not good, somebody got the lock before me
             // So wait for a file
             while (!mBoxLock.createNewFile() && sleepCount < MAXSLEEPTIMES) {
                 try {
                     if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
                         StringBuffer logBuffer =
                                 new StringBuffer(128)
                                 .append(this.getClass().getName())
                                 .append(" Waiting for lock on file ")
                                 .append(mboxFile);
 
                         getLogger().debug(logBuffer.toString());
                     }
 
                     Thread.sleep(LOCKSLEEPDELAY);
                     sleepCount++;
                 } catch (InterruptedException e) {
                     getLogger().error("File lock wait for " + mboxFile + " interrupted!",e);
 
                 }
             }
             if (sleepCount >= MAXSLEEPTIMES) {
                 throw new Exception("Unable to get lock on file " + mboxFile);
             }
         }
     }
 
     /***
      * Unlock a previously locked mbox file
      */
     private void unlockMBox() {
         // Just delete the MBOX file
         String lockFileName = mboxFile + LOCKEXT;
         File mBoxLock = new File(lockFileName);
         if (!mBoxLock.delete()) {
             StringBuffer logBuffer =
                     new StringBuffer(128)
                     .append(this.getClass().getName())
                     .append(" Failed to delete lock file ")
                     .append(lockFileName);
             getLogger().error(logBuffer.toString());
         }
     }
 
 
 
     /***
      * Remove a list of messages from disk
      * The collection is simply a list of mails to delete
      * @param mails
      */
     public void remove(final Collection mails)
     {
         if ((DEEP_DEBUG) && (getLogger().isDebugEnabled())) {
             StringBuffer logBuffer =
                     new StringBuffer(128)
                     .append(this.getClass().getName())
                     .append(" Removing entry for key ")
                     .append(mails);
 
             getLogger().debug(logBuffer.toString());
         }
         // The plan is as follows:
         // Attempt to locate the message in the file
         // by reading through the
         // once we've done that then seek to the file
         try {
             RandomAccessFile ins = new RandomAccessFile(mboxFile, "r"); // The source
             final RandomAccessFile outputFile = new RandomAccessFile(mboxFile + WORKEXT, "rw"); // The destination
             parseMboxFile(ins, new MessageAction() {
                 public boolean isComplete() { return false; }
                 public MimeMessage messageAction(String messageSeparator, String bodyText, long messageStart) {
                     // Write out the messages as we go, until we reach the key we want
                     try {
                         String currentKey=generateKeyValue(bodyText);
                         boolean foundKey=false;
                         Iterator mailList = mails.iterator();
                         String key;
                         while (mailList.hasNext()) {
                             // Attempt to find the current key in the array
                             key = ((Mail)mailList.next()).getName();
                             if (key.equals(currentKey)) {
                                 // Don't write the message to disk
                                 foundKey = true;
                                 break;
                             }
                         }
                         if (foundKey == false)
                         {
                             // We didn't find the key in the array so we will keep it
                             outputFile.writeBytes(messageSeparator + "\n");
                             outputFile.writeBytes(bodyText);
 
                         }
                     } catch (NoSuchAlgorithmException e) {
                         getLogger().error("MD5 not supported! ",e);
                     } catch (IOException e) {
                         getLogger().error("Unable to write file (General I/O problem) " + mboxFile, e);
                     }
                     return null;
                 }
             });
             ins.close();
             outputFile.close();
             // Delete the old mbox file
             File mbox = new File(mboxFile);
             mbox.delete();
             // And rename the lock file to be the new mbox
             mbox = new File(mboxFile + WORKEXT);
             if (!mbox.renameTo(new File(mboxFile)))
             {
                  System.out.println("Failed to rename file!");
             }
 
             // Now delete the keys in mails from the main hash
             Iterator mailList = mails.iterator();
             String key;
             while (mailList.hasNext()) {
                 // Attempt to find the current key in the array
                 key = ((Mail)mailList.next()).getName();
                 mList.remove(key);
             }
 
 
         } catch (FileNotFoundException e) {
             getLogger().error("Unable to save(open) file (File not found) " + mboxFile, e);
         } catch (IOException e) {
             getLogger().error("Unable to write file (General I/O problem) " + mboxFile, e);
         }
     }
 
     /***
      * Remove a mail from the mbox file
      * @param key The key of the mail to delete
      */
     public void remove(String key) {
         loadKeys();
         try {
             lockMBox();
         } catch (Exception e) {
             getLogger().error("Lock failed!",e);
             return; // No lock, so exit
         }
         ArrayList keys = new ArrayList();
         keys.add(key);
 
         this.remove(keys);
         unlockMBox();
     }
 
     /***
      * Not implemented
      * @param key
      * @return
      */
     public boolean lock(String key) {
         return false;
     }
 
     /***
      * Not implemented
      * @param key
      * @return
      */
     public boolean unlock(String key) {
         return false;
     }
 
 
     /***
      * @see org.apache.avalon.framework.service.Serviceable#compose(ServiceManager )
      */
     public void service( final ServiceManager componentManager )
             throws ServiceException {
     }
 
     /***
      * Configure the component
      * @param conf
      * @throws ConfigurationException
      */
     public void configure(Configuration conf) throws ConfigurationException {
         String destination;
         this.mList = null;
         BUFFERING = conf.getAttributeAsBoolean("BUFFERING", true);
         destination = conf.getAttribute("destinationURL");
         if (destination.charAt(destination.length() - 1) == '/') {
             // Remove the trailing / as well as the protocol marker
             mboxFile = destination.substring("mbox://".length(), destination.lastIndexOf("/"));
         } else {
             mboxFile = destination.substring("mbox://".length());
         }
 
         if (getLogger().isDebugEnabled()) {
             getLogger().debug("MBoxMailRepository.destinationURL: " + destination);
         }
 
         String checkType = conf.getAttribute("type");
         if (!(checkType.equals("MAIL") || checkType.equals("SPOOL"))) {
             String exceptionString = "Attempt to configure MboxMailRepository as " + checkType;
             if (getLogger().isWarnEnabled()) {
                 getLogger().warn(exceptionString);
             }
             throw new ConfigurationException(exceptionString);
         }
     }
 
 
     /***
      * Initialise the component
      * @throws Exception
      */
     public void initialize() throws Exception {
     }
 
 
     public static void main(String[] args) {
         // Test invocation
         MBoxMailRepository mbx = new MBoxMailRepository();
         mbx.mboxFile = "C://java//test//1998-05.txt";
         Iterator mList = mbx.list();
         while (mList.hasNext()) {
             //String key = (String) mList.next();
             //System.out.println("key=" + key);
             /*MailImpl mi =  mbx.retrieve(key);
             try
             {
                 System.out.println("Subject : " +  (mi.getMessage()).getSubject());
             }
             catch (MessagingException e)
             {
                 e.printStackTrace();  //To change body of catch statement use Options | File Templates.
             } */
 
         }
 
 
 /*        MailImpl mi = mbx.retrieve("ffffffb4ffffffe2f59fffffff291dffffffde4366243ffffff971d1f24");
         try {
             System.out.println("Subject : " + (mi.getMessage()).getSubject());
         } catch (MessagingException e) {
             e.printStackTrace();  //To change body of catch statement use Options | File Templates.
         }
         mbx.remove("ffffffb4ffffffe2f59fffffff291dffffffde4366243ffffff971d1f24");*/
     }
 }