/**
    *
    * Copyright 2003-2006 The Apache Software Foundation
    *
    *  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.
   */
  
  package javax.mail.internet;
  
  import java.io.BufferedInputStream;
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.ObjectStreamException;
  import java.io.OutputStream;
  import java.io.UnsupportedEncodingException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Date;
  import java.util.Enumeration;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import javax.activation.DataHandler;
  import javax.mail.Address;
  import javax.mail.Flags;
  import javax.mail.Folder;
  import javax.mail.Message;
  import javax.mail.MessagingException;
  import javax.mail.Multipart;
  import javax.mail.Part;
  import javax.mail.Session;
  import javax.mail.internet.HeaderTokenizer.Token;
  
  import org.apache.geronimo.mail.util.ASCIIUtil;
  import org.apache.geronimo.mail.util.SessionUtil;
  
  /**
   * @version $Rev: 421852 $ $Date: 2006-07-14 03:02:19 -0700 (Fri, 14 Jul 2006) $
   */
  public class MimeMessage extends Message implements MimePart {
  	private static final String MIME_ADDRESS_STRICT = "mail.mime.address.strict";
  	private static final String MIME_DECODEFILENAME = "mail.mime.decodefilename";
  	private static final String MIME_ENCODEFILENAME = "mail.mime.encodefilename";
  
  	private static final String MAIL_ALTERNATES = "mail.alternates";
  	private static final String MAIL_REPLYALLCC = "mail.replyallcc";
  
      // static used to ensure message ID uniqueness
      private static int messageID = 0;
  
  
      /**
       * Extends {@link javax.mail.Message.RecipientType} to support addition recipient types.
       */
      public static class RecipientType extends Message.RecipientType {
          /**
           * Recipient type for Usenet news.
           */
          public static final RecipientType NEWSGROUPS = new RecipientType("Newsgroups");
  
          protected RecipientType(String type) {
              super(type);
          }
  
          /**
           * Ensure the singleton is returned.
           *
           * @return resolved object
           */
          protected Object readResolve() throws ObjectStreamException {
              if (this.type.equals("Newsgroups")) {
                  return NEWSGROUPS;
              } else {
                  return super.readResolve();
              }
          }
      }
  
      /**
       * The {@link DataHandler} for this Message's content.
       */
      protected DataHandler dh;
      /**
       * This message's content (unless sourced from a SharedInputStream).
       */
      protected byte[] content;
     /**
      * If the data for this message was supplied by a {@link SharedInputStream}
      * then this is another such stream representing the content of this message;
      * if this field is non-null, then {@link #content} will be null.
      */
     protected InputStream contentStream;
     /**
      * This message's headers.
      */
     protected InternetHeaders headers;
     /**
      * This message's flags.
      */
     protected Flags flags;
     /**
      * Flag indicating that the message has been modified; set to true when
      * an empty message is created or when {@link #saveChanges()} is called.
      */
     protected boolean modified;
     /**
      * Flag indicating that the message has been saved.
      */
     protected boolean saved;
 
     private final MailDateFormat dateFormat = new MailDateFormat();
 
     /**
      * Create a new MimeMessage.
      * An empty message is created, with empty {@link #headers} and empty {@link #flags}.
      * The {@link #modified} flag is set.
      *
      * @param session the session for this message
      */
     public MimeMessage(Session session) {
         super(session);
         headers = new InternetHeaders();
         flags = new Flags();
         // empty messages are modified, because the content is not there, and require saving before use.
         modified = true;
         saved = false;
     }
 
     /**
      * Create a MimeMessage by reading an parsing the data from the supplied stream.
      *
      * @param session the session for this message
      * @param in      the stream to load from
      * @throws MessagingException if there is a problem reading or parsing the stream
      */
     public MimeMessage(Session session, InputStream in) throws MessagingException {
         this(session);
         parse(in);
         // this message is complete, so marked as unmodified.
         modified = false;
         // and no saving required
         saved = true;
     }
 
     /**
      * Copy a MimeMessage.
      *
      * @param message the message to copy
      * @throws MessagingException is there was a problem copying the message
      */
     public MimeMessage(MimeMessage message) throws MessagingException {
         super(message.session);
         // this is somewhat difficult to do.  There's a lot of data in both the superclass and this
         // class that needs to undergo a "deep cloning" operation.  These operations don't really exist
         // on the objects in question, so the only solution I can come up with is to serialize the
         // message data of the source object using the write() method, then reparse the data in this
         // object.  I've not found a lot of uses for this particular constructor, so perhaps that's not
         // really all that bad of a solution.
 
         // serialized this out to an in-memory stream.
         ByteArrayOutputStream copy = new ByteArrayOutputStream();
 
         try {
             // write this out the stream.
             message.writeTo(copy);
             copy.close();
             // I think this ends up creating a new array for the data, but I'm not aware of any more
             // efficient options.
             ByteArrayInputStream inData = new ByteArrayInputStream(copy.toByteArray());
             // now reparse this message into this object.
             inData.close();
             parse (inData);
             // writing out the source data requires saving it, so we should consider this one saved also.
             saved = true;
             // this message is complete, so marked as unmodified.
             modified = false;
         } catch (IOException e) {
             // I'm not sure ByteArrayInput/OutputStream actually throws IOExceptions or not, but the method
             // signatures declare it, so we need to deal with it.  Turning it into a messaging exception
             // should fit the bill.
             throw new MessagingException("Error copying MimeMessage data", e);
         }
     }
 
     /**
      * Create an new MimeMessage in the supplied {@link Folder} and message number.
      *
      * @param folder the Folder that contains the new message
      * @param number the message number of the new message
      */
     protected MimeMessage(Folder folder, int number) {
         super(folder, number);
         headers = new InternetHeaders();
         flags = new Flags();
         // saving primarly involves updates to the message header.  Since we're taking the header info
         // from a message store in this context, we mark the message as saved.
         saved = true;
         // we've not filled in the content yet, so this needs to be marked as modified
         modified = true;
     }
 
     /**
      * Create a MimeMessage by reading an parsing the data from the supplied stream.
      *
      * @param folder the folder for this message
      * @param in     the stream to load from
      * @param number the message number of the new message
      * @throws MessagingException if there is a problem reading or parsing the stream
      */
     protected MimeMessage(Folder folder, InputStream in, int number) throws MessagingException {
         this(folder, number);
         parse(in);
         // this message is complete, so marked as unmodified.
         modified = false;
         // and no saving required
         saved = true;
     }
 
 
     /**
      * Create a MimeMessage with the supplied headers and content.
      *
      * @param folder  the folder for this message
      * @param headers the headers for the new message
      * @param content the content of the new message
      * @param number  the message number of the new message
      * @throws MessagingException if there is a problem reading or parsing the stream
      */
     protected MimeMessage(Folder folder, InternetHeaders headers, byte[] content, int number) throws MessagingException {
         this(folder, number);
         this.headers = headers;
         this.content = content;
         // this message is complete, so marked as unmodified.
         modified = false;
     }
 
     /**
      * Parse the supplied stream and initialize {@link #headers} and {@link #content} appropriately.
      *
      * @param in the stream to read
      * @throws MessagingException if there was a problem parsing the stream
      */
     protected void parse(InputStream in) throws MessagingException {
         in = new BufferedInputStream(in);
         // create the headers first from the stream
         headers = new InternetHeaders(in);
 
         // now we need to get the rest of the content as a byte array...this means reading from the current
         // position in the stream until the end and writing it to an accumulator ByteArrayOutputStream.
         ByteArrayOutputStream baos = new ByteArrayOutputStream();
         try {
             byte buffer[] = new byte[1024];
             int count;
             while ((count = in.read(buffer, 0, 1024)) != -1) {
                 baos.write(buffer, 0, count);
             }
         } catch (Exception e) {
             throw new MessagingException(e.toString(), e);
         }
         // and finally extract the content as a byte array.
         content = baos.toByteArray();
     }
 
     /**
      * Get the message "From" addresses.  This looks first at the
      * "From" headers, and no "From" header is found, the "Sender"
      * header is checked.  Returns null if not found.
      *
      * @return An array of addresses identifying the message from target.  Returns
      *         null if this is not resolveable from the headers.
      * @exception MessagingException
      */
     public Address[] getFrom() throws MessagingException {
         // strict addressing controls this.
         boolean strict = isStrictAddressing();
         Address[] result = getHeaderAsInternetAddresses("From", strict);
         if (result == null) {
             result = getHeaderAsInternetAddresses("Sender", strict);
         }
         return result;
     }
 
     /**
      * Set the current message "From" recipient.  This replaces any
      * existing "From" header.  If the address is null, the header is
      * removed.
      *
      * @param address The new "From" target.
      *
      * @exception MessagingException
      */
     public void setFrom(Address address) throws MessagingException {
         setHeader("From", address);
     }
 
     /**
      * Set the "From" header using the value returned by {@link InternetAddress#getLocalAddress(javax.mail.Session)}.
      *
      * @throws MessagingException if there was a problem setting the header
      */
     public void setFrom() throws MessagingException {
         InternetAddress address = InternetAddress.getLocalAddress(session);
         // no local address resolvable?  This is an error.
         if (address == null) {
             throw new MessagingException("No local address defined");
         }
         setFrom(address);
     }
 
     /**
      * Add a set of addresses to the existing From header.
      *
      * @param addresses The list to add.
      *
      * @exception MessagingException
      */
     public void addFrom(Address[] addresses) throws MessagingException {
         addHeader("From", addresses);
     }
 
     /**
      * Return the "Sender" header as an address.
      *
      * @return the "Sender" header as an address, or null if not present
      * @throws MessagingException if there was a problem parsing the header
      */
     public Address getSender() throws MessagingException {
         Address[] addrs = getHeaderAsInternetAddresses("Sender", isStrictAddressing());
         return addrs != null && addrs.length > 0 ? addrs[0] : null;
     }
 
     /**
      * Set the "Sender" header.  If the address is null, this
      * will remove the current sender header.
      *
      * @param address the new Sender address
      *
      * @throws MessagingException
      *                if there was a problem setting the header
      */
     public void setSender(Address address) throws MessagingException {
         setHeader("Sender", address);
     }
 
     /**
      * Gets the recipients by type.  Returns null if there are no
      * headers of the specified type.  Acceptable RecipientTypes are:
      *
      *   javax.mail.Message.RecipientType.TO
      *   javax.mail.Message.RecipientType.CC
      *   javax.mail.Message.RecipientType.BCC
      *   javax.mail.internet.MimeMessage.RecipientType.NEWSGROUPS
      *
      * @param type   The message RecipientType identifier.
      *
      * @return The array of addresses for the specified recipient types.
      * @exception MessagingException
      */
     public Address[] getRecipients(Message.RecipientType type) throws MessagingException {
         // is this a NEWSGROUP request?  We need to handle this as a special case here, because
         // this needs to return NewsAddress instances instead of InternetAddress items.
         if (type == RecipientType.NEWSGROUPS) {
             return getHeaderAsNewsAddresses(getHeaderForRecipientType(type));
         }
         // the other types are all internet addresses.
         return getHeaderAsInternetAddresses(getHeaderForRecipientType(type), isStrictAddressing());
     }
 
     /**
      * Retrieve all of the recipients defined for this message.  This
      * returns a merged array of all possible message recipients
      * extracted from the headers.  The relevant header types are:
      *
      *
      *    javax.mail.Message.RecipientType.TO
      *    javax.mail.Message.RecipientType.CC
      *    javax.mail.Message.RecipientType.BCC
      *    javax.mail.internet.MimeMessage.RecipientType.NEWSGROUPS
      *
      * @return An array of all target message recipients.
      * @exception MessagingException
      */
     public Address[] getAllRecipients() throws MessagingException {
         List recipients = new ArrayList();
         addRecipientsToList(recipients, RecipientType.TO);
         addRecipientsToList(recipients, RecipientType.CC);
         addRecipientsToList(recipients, RecipientType.BCC);
         addRecipientsToList(recipients, RecipientType.NEWSGROUPS);
 
         // this is supposed to return null if nothing is there.
         if (recipients.isEmpty()) {
             return null;
         }
         return (Address[]) recipients.toArray(new Address[recipients.size()]);
     }
 
     /**
      * Utility routine to merge different recipient types into a
      * single list.
      *
      * @param list   The accumulator list.
      * @param type   The recipient type to extract.
      *
      * @exception MessagingException
      */
     private void addRecipientsToList(List list, Message.RecipientType type) throws MessagingException {
 
         Address[] recipients;
         if (type == RecipientType.NEWSGROUPS) {
             recipients = getHeaderAsNewsAddresses(getHeaderForRecipientType(type));
         }
         else {
             recipients = getHeaderAsInternetAddresses(getHeaderForRecipientType(type), isStrictAddressing());
         }
         if (recipients != null) {
             list.addAll(Arrays.asList(recipients));
         }
     }
 
     /**
      * Set a recipients list for a particular recipient type.  If the
      * list is null, the corresponding header is removed.
      *
      * @param type      The type of recipient to set.
      * @param addresses The list of addresses.
      *
      * @exception MessagingException
      */
     public void setRecipients(Message.RecipientType type, Address[] addresses) throws MessagingException {
         setHeader(getHeaderForRecipientType(type), addresses);
     }
 
     /**
      * Set a recipient field to a string address (which may be a
      * list or group type).
      *
      * If the address is null, the field is removed.
      *
      * @param type    The type of recipient to set.
      * @param address The address string.
      *
      * @exception MessagingException
      */
     public void setRecipients(Message.RecipientType type, String address) throws MessagingException {
         setOrRemoveHeader(getHeaderForRecipientType(type), address);
     }
 
 
     /**
      * Add a list of addresses to a target recipient list.
      *
      * @param type    The target recipient type.
      * @param address An array of addresses to add.
      *
      * @exception MessagingException
      */
     public void addRecipients(Message.RecipientType type, Address[] address) throws MessagingException {
         addHeader(getHeaderForRecipientType(type), address);
     }
 
     /**
      * Add an address to a target recipient list by string name.
      *
      * @param type    The target header type.
      * @param address The address to add.
      *
      * @exception MessagingException
      */
     public void addRecipients(Message.RecipientType type, String address) throws MessagingException {
         addHeader(getHeaderForRecipientType(type), address);
     }
 
     /**
      * Get the ReplyTo address information.  The headers are parsed
      * using the "mail.mime.address.strict" setting.  If the "Reply-To" header does
      * not have any addresses, then the value of the "From" field is used.
      *
      * @return An array of addresses obtained from parsing the header.
      * @exception MessagingException
      */
     public Address[] getReplyTo() throws MessagingException {
          Address[] addresses = getHeaderAsInternetAddresses("Reply-To", isStrictAddressing());
          if (addresses == null) {
              addresses = getFrom();
          }
          return addresses;
     }
 
     /**
      * Set the Reply-To field to the provided list of addresses.  If
      * the address list is null, the header is removed.
      *
      * @param address The new field value.
      *
      * @exception MessagingException
      */
     public void setReplyTo(Address[] address) throws MessagingException {
         setHeader("Reply-To", address);
     }
 
     /**
      * Returns the value of the "Subject" header.  If the subject
      * is encoded as an RFC 2047 value, the value is decoded before
      * return.  If decoding fails, the raw string value is
      * returned.
      *
      * @return The String value of the subject field.
      * @exception MessagingException
      */
     public String getSubject() throws MessagingException {
         String subject = getSingleHeader("Subject");
         if (subject == null) {
             return null;
         } else {
             try {
                 // this needs to be unfolded before decodeing.
                 return MimeUtility.decodeText(MimeUtility.unfold(subject));
             } catch (UnsupportedEncodingException e) {
                 // ignored.
             }
         }
 
         return subject;
     }
 
     /**
      * Set the value for the "Subject" header.  If the subject
      * contains non US-ASCII characters, it is encoded in RFC 2047
      * fashion.
      *
      * If the subject value is null, the Subject field is removed.
      *
      * @param subject The new subject value.
      *
      * @exception MessagingException
      */
     public void setSubject(String subject) throws MessagingException {
         // just set this using the default character set.
         setSubject(subject, null);
     }
 
     public void setSubject(String subject, String charset) throws MessagingException {
         // standard null removal (yada, yada, yada....)
         if (subject == null) {
             removeHeader("Subject");
         }
         else {
             try {
                 String s = MimeUtility.fold(9, MimeUtility.encodeText(subject, charset, null));
                 // encode this, and then fold to fit the line lengths.
                 setHeader("Subject", MimeUtility.fold(9, MimeUtility.encodeText(subject, charset, null)));
             } catch (UnsupportedEncodingException e) {
                 throw new MessagingException("Encoding error", e);
             }
         }
     }
 
     /**
      * Get the value of the "Date" header field.  Returns null if
      * if the field is absent or the date is not in a parseable format.
      *
      * @return A Date object parsed according to RFC 822.
      * @exception MessagingException
      */
     public Date getSentDate() throws MessagingException {
         String value = getSingleHeader("Date");
         if (value == null) {
             return null;
         }
         try {
             return dateFormat.parse(value);
         } catch (java.text.ParseException e) {
             return null;
         }
     }
 
     /**
      * Set the message sent date.  This updates the "Date" header.
      * If the provided date is null, the header is removed.
      *
      * @param sent   The new sent date value.
      *
      * @exception MessagingException
      */
     public void setSentDate(Date sent) throws MessagingException {
         setOrRemoveHeader("Date", dateFormat.format(sent));
     }
 
     /**
      * Get the message received date.  The Sun implementation is
      * documented as always returning null, so this one does too.
      *
      * @return Always returns null.
      * @exception MessagingException
      */
     public Date getReceivedDate() throws MessagingException {
         return null;
     }
 
     /**
      * Return the content size of this message.  This is obtained
      * either from the size of the content field (if available) or
      * from the contentStream, IFF the contentStream returns a positive
      * size.  Returns -1 if the size is not available.
      *
      * @return Size of the content in bytes.
      * @exception MessagingException
      */
     public int getSize() throws MessagingException {
         if (content != null) {
             return content.length;
         }
         if (contentStream != null) {
             try {
                 int size = contentStream.available();
                 if (size > 0) {
                     return size;
                 }
             } catch (IOException e) {
                 // ignore
             }
         }
         return -1;
     }
 
     /**
      * Retrieve the line count for the current message.  Returns
      * -1 if the count cannot be determined.
      *
      * The Sun implementation always returns -1, so this version
      * does too.
      *
      * @return The content line count (always -1 in this implementation).
      * @exception MessagingException
      */
     public int getLineCount() throws MessagingException {
         return -1;
     }
 
     /**
      * Returns the current content type (defined in the "Content-Type"
      * header.  If not available, "text/plain" is the default.
      *
      * @return The String name of the message content type.
      * @exception MessagingException
      */
     public String getContentType() throws MessagingException {
         String value = getSingleHeader("Content-Type");
         if (value == null) {
             value = "text/plain";
         }
         return value;
     }
 
 
     /**
      * Tests to see if this message has a mime-type match with the
      * given type name.
      *
      * @param type   The tested type name.
      *
      * @return If this is a type match on the primary and secondare portion of the types.
      * @exception MessagingException
      */
     public boolean isMimeType(String type) throws MessagingException {
         return new ContentType(getContentType()).match(type);
     }
 
     /**
      * Retrieve the message "Content-Disposition" header field.
      * This value represents how the part should be represented to
      * the user.
      *
      * @return The string value of the Content-Disposition field.
      * @exception MessagingException
      */
     public String getDisposition() throws MessagingException {
         String disp = getSingleHeader("Content-Disposition");
         if (disp != null) {
             return new ContentDisposition(disp).getDisposition();
         }
         return null;
     }
 
 
     /**
      * Set a new dispostion value for the "Content-Disposition" field.
      * If the new value is null, the header is removed.
      *
      * @param disposition
      *               The new disposition value.
      *
      * @exception MessagingException
      */
     public void setDisposition(String disposition) throws MessagingException {
         if (disposition == null) {
             removeHeader("Content-Disposition");
         }
         else {
             // the disposition has parameters, which we'll attempt to preserve in any existing header.
             String currentHeader = getSingleHeader("Content-Disposition");
             if (currentHeader != null) {
                 ContentDisposition content = new ContentDisposition(currentHeader);
                 content.setDisposition(disposition);
                 setHeader("Content-Disposition", content.toString());
             }
             else {
                 // set using the raw string.
                 setHeader("Content-Disposition", disposition);
             }
         }
     }
 
     /**
      * Decode the Content-Transfer-Encoding header to determine
      * the transfer encoding type.
      *
      * @return The string name of the required encoding.
      * @exception MessagingException
      */
     public String getEncoding() throws MessagingException {
         // this might require some parsing to sort out.
         String encoding = getSingleHeader("Content-Transfer-Encoding");
         if (encoding != null) {
             // we need to parse this into ATOMs and other constituent parts.  We want the first
             // ATOM token on the string.
             HeaderTokenizer tokenizer = new HeaderTokenizer(encoding, HeaderTokenizer.MIME);
 
             Token token = tokenizer.next();
             while (token.getType() != Token.EOF) {
                 // if this is an ATOM type, return it.
                 if (token.getType() == Token.ATOM) {
                     return token.getValue();
                 }
             }
             // not ATOMs found, just return the entire header value....somebody might be able to make sense of
             // this.
             return encoding;
         }
         // no header, nothing to return.
         return null;
     }
 
     /**
      * Retrieve the value of the "Content-ID" header.  Returns null
      * if the header does not exist.
      *
      * @return The current header value or null.
      * @exception MessagingException
      */
     public String getContentID() throws MessagingException {
         return getSingleHeader("Content-ID");
     }
 
     public void setContentID(String cid) throws MessagingException {
         setOrRemoveHeader("Content-ID", cid);
     }
 
     public String getContentMD5() throws MessagingException {
         return getSingleHeader("Content-MD5");
     }
 
     public void setContentMD5(String md5) throws MessagingException {
         setOrRemoveHeader("Content-MD5", md5);
     }
 
     public String getDescription() throws MessagingException {
         String description = getSingleHeader("Content-Description");
         if (description != null) {
             try {
                 // this could be both folded and encoded.  Return this to usable form.
                 return MimeUtility.decodeText(MimeUtility.unfold(description));
             } catch (UnsupportedEncodingException e) {
                 // ignore
             }
         }
         // return the raw version for any errors.
         return description;
     }
 
     public void setDescription(String description) throws MessagingException {
         setDescription(description, null);
     }
 
     public void setDescription(String description, String charset) throws MessagingException {
         if (description == null) {
             removeHeader("Content-Description");
         }
         else {
             try {
                 setHeader("Content-Description", MimeUtility.fold(21, MimeUtility.encodeText(description, charset, null)));
             } catch (UnsupportedEncodingException e) {
                 throw new MessagingException(e.getMessage(), e);
             }
         }
 
     }
 
     public String[] getContentLanguage() throws MessagingException {
         return getHeader("Content-Language");
     }
 
     public void setContentLanguage(String[] languages) throws MessagingException {
         if (languages == null) {
             removeHeader("Content-Language");
         } else if (languages.length == 1) {
             setHeader("Content-Language", languages[0]);
         } else {
             StringBuffer buf = new StringBuffer(languages.length * 20);
             buf.append(languages[0]);
             for (int i = 1; i < languages.length; i++) {
                 buf.append(',').append(languages[i]);
             }
             setHeader("Content-Language", buf.toString());
         }
     }
 
     public String getMessageID() throws MessagingException {
         return getSingleHeader("Message-ID");
     }
 
     public String getFileName() throws MessagingException {
         // see if there is a disposition.  If there is, parse off the filename parameter.
         String disposition = getDisposition();
         String filename = null;
 
         if (disposition != null) {
             filename = new ContentDisposition(disposition).getParameter("filename");
         }
 
         // if there's no filename on the disposition, there might be a name parameter on a
         // Content-Type header.
         if (filename == null) {
             String type = getContentType();
             if (type != null) {
                 try {
                     filename = new ContentType(type).getParameter("name");
                 } catch (ParseException e) {
                 }
             }
         }
         // if we have a name, we might need to decode this if an additional property is set.
         if (filename != null && SessionUtil.getBooleanProperty(session, MIME_DECODEFILENAME, false)) {
             try {
                 filename = MimeUtility.decodeText(filename);
             } catch (UnsupportedEncodingException e) {
                 throw new MessagingException("Unable to decode filename", e);
             }
         }
 
         return filename;
     }
 
 
     public void setFileName(String name) throws MessagingException {
         // there's an optional session property that requests file name encoding...we need to process this before
         // setting the value.
         if (name != null && SessionUtil.getBooleanProperty(session, MIME_ENCODEFILENAME, false)) {
             try {
                 name = MimeUtility.encodeText(name);
             } catch (UnsupportedEncodingException e) {
                 throw new MessagingException("Unable to encode filename", e);
             }
         }
 
         // get the disposition string.
         String disposition = getDisposition();
         // if not there, then this is an attachment.
         if (disposition == null) {
             disposition = Part.ATTACHMENT;
         }
         // now create a disposition object and set the parameter.
         ContentDisposition contentDisposition = new ContentDisposition(disposition);
         contentDisposition.setParameter("filename", name);
 
         // serialize this back out and reset.
         setDisposition(contentDisposition.toString());
     }
 
     public InputStream getInputStream() throws MessagingException, IOException {
         return getDataHandler().getInputStream();
     }
 
     protected InputStream getContentStream() throws MessagingException {
         if (contentStream != null) {
             return contentStream;
         }
 
         if (content != null) {
             return new ByteArrayInputStream(content);
         } else {
             throw new MessagingException("No content");
         }
     }
 
     public InputStream getRawInputStream() throws MessagingException {
         return getContentStream();
     }
 
     public synchronized DataHandler getDataHandler() throws MessagingException {
         if (dh == null) {
             dh = new DataHandler(new MimePartDataSource(this));
         }
         return dh;
     }
 
     public Object getContent() throws MessagingException, IOException {
         return getDataHandler().getContent();
     }
 
     public void setDataHandler(DataHandler handler) throws MessagingException {
         dh = handler;
         // if we have a handler override, then we need to invalidate any content
         // headers that define the types.  This information will be derived from the
         // data heander unless subsequently overridden.
         removeHeader("Content-Type");
         removeHeader("Content-Transfer-Encoding");
     }
 
     public void setContent(Object content, String type) throws MessagingException {
         setDataHandler(new DataHandler(content, type));
     }
 
     public void setText(String text) throws MessagingException {
         setText(text, null, "plain");
     }
 
     public void setText(String text, String charset) throws MessagingException {
         setText(text, charset, "plain");
     }
 
 
     public void setText(String text, String charset, String subtype) throws MessagingException {
         // we need to sort out the character set if one is not provided.
         if (charset == null) {
             // if we have non us-ascii characters here, we need to adjust this.
             if (!ASCIIUtil.isAscii(text)) {
                 charset = MimeUtility.getDefaultMIMECharset();
             }
             else {
                 charset = "us-ascii";
             }
         }
         setContent(text, "text/" + subtype + "; charset=" + MimeUtility.quote(charset, HeaderTokenizer.MIME));
     }
 
     public void setContent(Multipart part) throws MessagingException {
         setDataHandler(new DataHandler(part, part.getContentType()));
         part.setParent(this);
     }
 
     public Message reply(boolean replyToAll) throws MessagingException {
         // create a new message in this session.
         MimeMessage reply = createMimeMessage(session);
 
         // get the header and add the "Re:" bit, if necessary.
         String newSubject = getSubject();
         if (newSubject != null) {
             // check to see if it already begins with "Re: " (in any case).
             // Add one on if we don't have it yet.
             if (!newSubject.regionMatches(true, 0, "Re: ", 0, 4)) {
                 newSubject = "Re: " + newSubject;
             }
             reply.setSubject(newSubject);
         }
 
         Address[] toRecipients = getReplyTo();
 
         // set the target recipients the replyTo value
         reply.setRecipients(Message.RecipientType.TO, getReplyTo());
 
         // need to reply to everybody?  More things to add.
         if (replyToAll) {
             // when replying, we want to remove "duplicates" in the final list.
 
             HashMap masterList = new HashMap();
 
             // reply to all implies add the local sender.  Add this to the list if resolveable.
             InternetAddress localMail = InternetAddress.getLocalAddress(session);
             if (localMail != null) {
                 masterList.put(localMail.getAddress(), localMail);
             }
             // see if we have some local aliases to deal with.
             String alternates = session.getProperty(MAIL_ALTERNATES);
             if (alternates != null) {
                 // parse this string list and merge with our set.
                 Address[] alternateList = InternetAddress.parse(alternates, false);
                 mergeAddressList(masterList, alternateList);
             }
 
             // the master list now contains an a list of addresses we will exclude from
             // the addresses.  From this point on, we're going to prune any additional addresses
             // against this list, AND add any new addresses to the list
 
             // now merge in the main recipients, and merge in the other recipents as well
             Address[] toList = pruneAddresses(masterList, getRecipients(Message.RecipientType.TO));
             if (toList.length != 0) {
                 // now check to see what sort of reply we've been asked to send.
                 // if replying to all as a CC, then we need to add to the CC list, otherwise they are
                 // TO recipients.
                 if (SessionUtil.getBooleanProperty(session, MAIL_REPLYALLCC, false)) {
                     reply.addRecipients(Message.RecipientType.CC, toList);
                 }
                 else {
                     reply.addRecipients(Message.RecipientType.TO, toList);
                 }
             }
             // and repeat for the CC list.
             toList = pruneAddresses(masterList, getRecipients(Message.RecipientType.CC));
             if (toList.length != 0) {
                 reply.addRecipients(Message.RecipientType.CC, toList);
             }
 
             // a news group list is separate from the normal addresses.  We just take these recepients
             // asis without trying to prune duplicates.
             toList = getRecipients(RecipientType.NEWSGROUPS);
             if (toList != null && toList.length != 0) {
                 reply.addRecipients(RecipientType.NEWSGROUPS, toList);
             }
         }
 
         // this is a bit of a pain.  We can't set the flags here by specifying the system flag, we need to
         // construct a flag item instance inorder to set it.
 
         // this is an answered email.
         setFlags(new Flags(Flags.Flag.ANSWERED), true);
         // all done, return the constructed Message object.
         return reply;
     }
 
 
     /**
      * Merge a set of addresses into a master accumulator list, eliminating
      * duplicates.
      *
      * @param master The set of addresses we've accumulated so far.
      * @param list   The list of addresses to merge in.
      */
     private void mergeAddressList(Map master, Address[] list) {
         // make sure we have a list.
         if (list == null) {
             return;
         }
         for (int i = 0; i < list.length; i++) {
             InternetAddress address = (InternetAddress)list[i];
 
             // if not in the master list already, add it now.
             if (!master.containsKey(address.getAddress())) {
                 master.put(address.getAddress(), address);
             }
         }
     }
 
 
     /**
      * Prune a list of addresses against our master address list,
      * returning the "new" addresses.  The master list will be
      * updated with this new set of addresses.
      *
      * @param master The master address list of addresses we've seen before.
      * @param list   The new list of addresses to prune.
      *
      * @return An array of addresses pruned of any duplicate addresses.
      */
     private Address[] pruneAddresses(Map master, Address[] list) {
         // return an empy array if we don't get an input list.
         if (list == null) {
             return new Address[0];
         }
 
         // optimistically assume there are no addresses to eliminate (common).
         ArrayList prunedList = new ArrayList(list.length);
         for (int i = 0; i < list.length; i++) {
             InternetAddress address = (InternetAddress)list[i];
 
             // if not in the master list, this is a new one.  Add to both the master list and
             // the pruned list.
             if (!master.containsKey(address.getAddress())) {
                 master.put(address.getAddress(), address);
                 prunedList.add(address);
             }
         }
         // convert back to list form.
         return (Address[])prunedList.toArray(new Address[0]);
     }
 
 
     /**
      * Write the message out to a stream in RFC 822 format.
      *
      * @param out    The target output stream.
      *
      * @exception MessagingException
      * @exception IOException
      */
     public void writeTo(OutputStream out) throws MessagingException, IOException {
         writeTo(out, null);
     }
 
     /**
      * Write the message out to a target output stream, excluding the
      * specified message headers.
      *
      * @param out    The target output stream.
      * @param ignoreHeaders
      *               An array of header types to ignore.  This can be null, which means
      *               write out all headers.
      *
      * @exception MessagingException
      * @exception IOException
      */
     public void writeTo(OutputStream out, String[] ignoreHeaders) throws MessagingException, IOException {
         // make sure everything is saved before we write
         if (!saved) {
             saveChanges();
         }
 
         // write out the headers first
         headers.writeTo(out, ignoreHeaders);
         // add the separater between the headers and the data portion.
         out.write('\r');
         out.write('\n');
 
         // if the modfied flag, we don't have current content, so the data handler needs to
         // take care of writing this data out.
         if (modified) {
             dh.writeTo(MimeUtility.encode(out, getEncoding()));
         } else {
             // if we have content directly, we can write this out now.
             if (content != null) {
                 out.write(content);
             }
             else {
                 // see if we can get a content stream for this message.  We might have had one
                 // explicitly set, or a subclass might override the get method to provide one.
                 InputStream in = getContentStream();
 
                 byte[] buffer = new byte[8192];
                 int length = in.read(buffer);
                 // copy the data stream-to-stream.
                 while (length > 0) {
                     out.write(buffer, 0, length);
                     length = in.read(buffer);
                 }
                 in.close();
             }
         }
 
         // flush any data we wrote out, but do not close the stream.  That's the caller's duty.
         out.flush();
     }
 
 
     /**
      * Retrieve all headers that match a given name.
      *
      * @param name   The target name.
      *
      * @return The set of headers that match the given name.  These headers
      *         will be the decoded() header values if these are RFC 2047
      *         encoded.
      * @exception MessagingException
      */
     public String[] getHeader(String name) throws MessagingException {
         return headers.getHeader(name);
     }
 
     /**
      * Get all headers that match a particular name, as a single string.
      * Individual headers are separated by the provided delimiter.   If
      * the delimiter is null, only the first header is returned.
      *
      * @param name      The source header name.
      * @param delimiter The delimiter string to be used between headers.  If null, only
      *                  the first is returned.
      *
      * @return The headers concatenated as a single string.
      * @exception MessagingException
      */
     public String getHeader(String name, String delimiter) throws MessagingException {
         return headers.getHeader(name, delimiter);
     }
 
     /**
      * Set a new value for a named header.
      *
      * @param name   The name of the target header.
      * @param value  The new value for the header.
      *
      * @exception MessagingException
      */
     public void setHeader(String name, String value) throws MessagingException {
         headers.setHeader(name, value);
     }
 
     /**
      * Conditionally set or remove a named header.  If the new value
      * is null, the header is removed.
      *
      * @param name   The header name.
      * @param value  The new header value.  A null value causes the header to be
      *               removed.
      *
      * @exception MessagingException
      */
     private void setOrRemoveHeader(String name, String value) throws MessagingException {
         if (value == null) {
             headers.removeHeader(name);
         }
         else {
             headers.setHeader(name, value);
         }
     }
 
     /**
      * Add a new value to an existing header.  The added value is
      * created as an additional header of the same type and value.
      *
      * @param name   The name of the target header.
      * @param value  The removed header.
      *
      * @exception MessagingException
      */
     public void addHeader(String name, String value) throws MessagingException {
         headers.addHeader(name, value);
     }
 
     /**
      * Remove a header with the given name.
      *
      * @param name   The name of the removed header.
      *
      * @exception MessagingException
      */
     public void removeHeader(String name) throws MessagingException {
         headers.removeHeader(name);
     }
 
     /**
      * Retrieve the complete list of message headers, as an enumeration.
      *
      * @return An Enumeration of the message headers.
      * @exception MessagingException
      */
     public Enumeration getAllHeaders() throws MessagingException {
         return headers.getAllHeaders();
     }
 
     public Enumeration getMatchingHeaders(String[] names) throws MessagingException {
         return headers.getMatchingHeaders(names);
     }
 
     public Enumeration getNonMatchingHeaders(String[] names) throws MessagingException {
         return headers.getNonMatchingHeaders(names);
     }
 
     public void addHeaderLine(String line) throws MessagingException {
         headers.addHeaderLine(line);
     }
 
     public Enumeration getAllHeaderLines() throws MessagingException {
         return headers.getAllHeaderLines();
     }
 
     public Enumeration getMatchingHeaderLines(String[] names) throws MessagingException {
         return headers.getMatchingHeaderLines(names);
     }
 
     public Enumeration getNonMatchingHeaderLines(String[] names) throws MessagingException {
         return headers.getNonMatchingHeaderLines(names);
     }
 
     public synchronized Flags getFlags() throws MessagingException {
         return (Flags) flags.clone();
     }
 
     public synchronized boolean isSet(Flags.Flag flag) throws MessagingException {
         return flags.contains(flag);
     }
 
     /**
      * Set or clear a flag value.
      *
      * @param flags  The set of flags to effect.
      * @param set    The value to set the flag to (true or false).
      *
      * @exception MessagingException
      */
     public synchronized void setFlags(Flags flag, boolean set) throws MessagingException {
         if (set) {
             flags.add(flag);
         }
         else {
             flags.remove(flag);
         }
     }
 
     /**
      * Saves any changes on this message.  When called, the modified
      * and saved flags are set to true and updateHeaders() is called
      * to force updates.
      *
      * @exception MessagingException
      */
     public void saveChanges() throws MessagingException {
         // setting modified invalidates the current content.
         modified = true;
         saved = true;
         // update message headers from the content.
         updateHeaders();
     }
 
     /**
      * Update the internet headers so that they make sense.  This
      * will attempt to make sense of the message content type
      * given the state of the content.
      *
      * @exception MessagingException
      */
     protected void updateHeaders() throws MessagingException {
 
         // make sure we set the MIME version
         setHeader("MIME-Version", "1.0");
 
         DataHandler handler = getDataHandler();
 
         try {
             // figure out the content type.  If not set, we'll need to figure this out.
             String type = dh.getContentType();
             // parse this content type out so we can do matches/compares.
             ContentType content = new ContentType(type);
 
             // is this a multipart content?
             if (content.match("multipart/*")) {
                 // the content is suppose to be a MimeMultipart.  Ping it to update it's headers as well.
                 try {
                     MimeMultipart part = (MimeMultipart)handler.getContent();
                     part.updateHeaders();
                 } catch (ClassCastException e) {
                     throw new MessagingException("Message content is not MimeMultipart", e);
                 }
             }
             else if (!content.match("message/rfc822")) {
                 // simple part, we need to update the header type information
                 // if no encoding is set yet, figure this out from the data handler content.
                 if (getSingleHeader("Content-Transfer-Encoding") == null) {
                     setHeader("Content-Transfer-Encoding", MimeUtility.getEncoding(handler));
                 }
 
                 // is a content type header set?  Check the property to see if we need to set this.
                 if (getSingleHeader("Content-Type") == null) {
                     if (SessionUtil.getBooleanProperty(session, "MIME_MAIL_SETDEFAULTTEXTCHARSET", true)) {
                         // is this a text type?  Figure out the encoding and make sure it is set.
                         if (content.match("text/*")) {
                             // the charset should be specified as a parameter on the MIME type.  If not there,
                             // try to figure one out.
                             if (content.getParameter("charset") == null) {
 
                                 String encoding = getEncoding();
                                 // if we're sending this as 7-bit ASCII, our character set need to be
                                 // compatible.
                                 if (encoding != null && encoding.equalsIgnoreCase("7bit")) {
                                     content.setParameter("charset", "us-ascii");
                                 }
                                 else {
                                     // get the global default.
                                     content.setParameter("charset", MimeUtility.getDefaultMIMECharset());
                                 }
                             }
                         }
                     }
                 }
             }
 
             // if we don't have a content type header, then create one.
             if (getSingleHeader("Content-Type") == null) {
                 // get the disposition header, and if it is there, copy the filename parameter into the
                 // name parameter of the type.
                 String disp = getSingleHeader("Content-Disposition");
                 if (disp != null) {
                     // parse up the string value of the disposition
                     ContentDisposition disposition = new ContentDisposition(disp);
                     // now check for a filename value
                     String filename = disposition.getParameter("filename");
                     // copy and rename the parameter, if it exists.
                     if (filename != null) {
                         content.setParameter("name", filename);
                     }
                 }
                 // set the header with the updated content type information.
                 setHeader("Content-Type", content.toString());
             }
 
             // new javamail 1.4 requirement.
             updateMessageID();
 
         } catch (IOException e) {
             throw new MessagingException("Error updating message headers", e);
         }
     }
 
 
     protected InternetHeaders createInternetHeaders(InputStream in) throws MessagingException {
         // internet headers has a constructor for just this purpose
         return new InternetHeaders(in);
     }
 
     /**
      * Convert a header into an array of NewsAddress items.
      *
      * @param header The name of the source header.
      *
      * @return The parsed array of addresses.
      * @exception MessagingException
      */
     private Address[] getHeaderAsNewsAddresses(String header) throws MessagingException {
         // NB:  We're using getHeader() here to allow subclasses an opportunity to perform lazy loading
         // of the headers.
         String mergedHeader = getHeader(header, ",");
         if (mergedHeader != null) {
             return NewsAddress.parse(mergedHeader);
         }
         return null;
     }
 
     private Address[] getHeaderAsInternetAddresses(String header, boolean strict) throws MessagingException {
         // NB:  We're using getHeader() here to allow subclasses an opportunity to perform lazy loading
         // of the headers.
         String mergedHeader = getHeader(header, ",");
 
         if (mergedHeader != null) {
             return InternetAddress.parseHeader(mergedHeader, strict);
         }
         return null;
     }
 
     /**
      * Check to see if we require strict addressing on parsing
      * internet headers.
      *
      * @return The current value of the "mail.mime.address.strict" session
      *         property, or true, if the property is not set.
      */
     private boolean isStrictAddressing() {
         return SessionUtil.getBooleanProperty(session, MIME_ADDRESS_STRICT, true);
     }
 
     /**
      * Set a named header to the value of an address field.
      *
      * @param header  The header name.
      * @param address The address value.  If the address is null, the header is removed.
      *
      * @exception MessagingException
      */
     private void setHeader(String header, Address address) throws MessagingException {
         if (address == null) {
             removeHeader(header);
         }
         else {
             setHeader(header, address.toString());
         }
     }
 
     /**
      * Set a header to a list of addresses.
      *
      * @param header    The header name.
      * @param addresses An array of addresses to set the header to.  If null, the
      *                  header is removed.
      */
     private void setHeader(String header, Address[] addresses) {
         if (addresses == null) {
             headers.removeHeader(header);
         }
         else {
             headers.setHeader(header, addresses);
         }
     }
 
     private void addHeader(String header, Address[] addresses) throws MessagingException {
         headers.addHeader(header, InternetAddress.toString(addresses));
     }
 
     private String getHeaderForRecipientType(Message.RecipientType type) throws MessagingException {
         if (RecipientType.TO == type) {
             return "To";
         } else if (RecipientType.CC == type) {
             return "Cc";
         } else if (RecipientType.BCC == type) {
             return "Bcc";
         } else if (RecipientType.NEWSGROUPS == type) {
             return "Newsgroups";
         } else {
             throw new MessagingException("Unsupported recipient type: " + type.toString());
         }
     }
 
     /**
      * Utility routine to get a header as a single string value
      * rather than an array of headers.
      *
      * @param name   The name of the header.
      *
      * @return The single string header value.  If multiple headers exist,
      *         the additional ones are ignored.
      * @exception MessagingException
      */
     private String getSingleHeader(String name) throws MessagingException {
         String[] values = getHeader(name);
         if (values == null || values.length == 0) {
             return null;
         } else {
             return values[0];
         }
     }
 
     /**
      * Update the message identifier after headers have been updated.
      *
      * The default message id is composed of the following items:
      *
      * 1)  A newly created object's hash code.
      * 2)  A uniqueness counter
      * 3)  The current time in milliseconds
      * 4)  The string JavaMail
      * 5)  The user's local address as returned by InternetAddress.getLocalAddress().
      *
      * @exception MessagingException
      */
     public void updateMessageID() throws MessagingException {
         StringBuffer id = new StringBuffer();
 
         id.append('<');
         id.append(new Object().hashCode());
         id.append('.');
         id.append(messageID++);
         id.append(System.currentTimeMillis());
         id.append('.');
         id.append("JavaMail.");
 
         // get the local address and apply a suitable default.
 
         InternetAddress localAddress = InternetAddress.getLocalAddress(session);
         if (localAddress != null) {
             id.append(localAddress.getAddress());
         }
         else {
             id.append("javamailuser@localhost");
         }
         id.append('>');
 
         setHeader("Message-ID", id.toString());
     }
 
     /**
      * Method used to create a new MimeMessage instance.  This method
      * is used whenever the MimeMessage class needs to create a new
      * Message instance (e.g, reply()).  This method allows subclasses
      * to override the class of message that gets created or set
      * default values, if needed.
      *
      * @param session The session associated with this message.
      *
      * @return A newly create MimeMessage instance.
      */
     protected MimeMessage createMimeMessage(Session session) {
         return new MimeMessage(session);
     }
 
 }