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Java 2 Platform EE v1.3: Class MimeBodyPart - Java Platform, Enterprise Edition v1.3.1 API Specifications

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javax.mail.internet
Class MimeBodyPart

java.lang.Object
  |
  +--javax.mail.BodyPart
        |
        +--javax.mail.internet.MimeBodyPart
All Implemented Interfaces:
MimePart, Part
public class MimeBodyPart
extends BodyPart
implements MimePart

This class represents a MIME body part. It implements the BodyPart abstract class and the MimePart interface. MimeBodyParts are contained in MimeMultipart objects.

MimeBodyPart uses the InternetHeaders class to parse and store the headers of that body part.

A note on RFC 822 and MIME headers

RFC 822 header fields must contain only US-ASCII characters. MIME allows non ASCII characters to be present in certain portions of certain headers, by encoding those characters. RFC 2047 specifies the rules for doing this. The MimeUtility class provided in this package can be used to to achieve this.

See Also:
Part, MimePart, MimeUtility

Field Summary
protected  byte[] content
          Byte array that holds the bytes of the content of this Part.
protected  DataHandler dh
          The DataHandler object representing this Part's content.
protected  InternetHeaders headers
          The InternetHeaders object that stores all the headers of this body part.
 
Fields inherited from class javax.mail.BodyPart
parent
 
Fields inherited from interface javax.mail.Part
ATTACHMENT, INLINE
 
Constructor Summary
MimeBodyPart()
          An empty MimeBodyPart object is created.
MimeBodyPart(java.io.InputStream is)
          Constructs a MimeBodyPart by reading and parsing the data from the specified input stream.
MimeBodyPart(InternetHeaders headers, byte[] content)
          Constructs a MimeBodyPart using the given header and content bytes.
 
Method Summary
 void addHeader(java.lang.String name, java.lang.String value)
          Add this value to the existing values for this header_name.
 void addHeaderLine(java.lang.String line)
          Add a header line to this body part
 java.util.Enumeration getAllHeaderLines()
          Get all header lines as an Enumeration of Strings.
 java.util.Enumeration getAllHeaders()
          Return all the headers from this Message as an Enumeration of Header objects.
 java.lang.Object getContent()
          Return the content as a java object.
 java.lang.String getContentID()
          Returns the value of the "Content-ID" header field.
 java.lang.String[] getContentLanguage()
          Get the languages specified in the Content-Language header of this MimePart.
 java.lang.String getContentMD5()
          Return the value of the "Content-MD5" header field.
protected  java.io.InputStream getContentStream()
          Produce the raw bytes of the content.
 java.lang.String getContentType()
          Returns the value of the RFC 822 "Content-Type" header field.
 DataHandler getDataHandler()
          Return a DataHandler for this body part's content.
 java.lang.String getDescription()
          Returns the "Content-Description" header field of this body part.
 java.lang.String getDisposition()
          Returns the value of the "Content-Disposition" header field.
 java.lang.String getEncoding()
          Returns the content transfer encoding from the "Content-Transfer-Encoding" header field.
 java.lang.String getFileName()
          Get the filename associated with this body part.
 java.lang.String[] getHeader(java.lang.String name)
          Get all the headers for this header_name.
 java.lang.String getHeader(java.lang.String name, java.lang.String delimiter)
          Get all the headers for this header name, returned as a single String, with headers separated by the delimiter.
 java.io.InputStream getInputStream()
          Return a decoded input stream for this body part's "content".
 int getLineCount()
          Return the number of lines for the content of this Part.
 java.util.Enumeration getMatchingHeaderLines(java.lang.String[] names)
          Get matching header lines as an Enumeration of Strings.
 java.util.Enumeration getMatchingHeaders(java.lang.String[] names)
          Return matching headers from this Message as an Enumeration of Header objects.
 java.util.Enumeration getNonMatchingHeaderLines(java.lang.String[] names)
          Get non-matching header lines as an Enumeration of Strings.
 java.util.Enumeration getNonMatchingHeaders(java.lang.String[] names)
          Return non-matching headers from this Message as an Enumeration of Header objects.
 int getSize()
          Return the size of the content of this body part in bytes.
 boolean isMimeType(java.lang.String mimeType)
          Is this Part of the specified MIME type? This method compares only the primaryType and subType.
 void removeHeader(java.lang.String name)
          Remove all headers with this name.
 void setContent(Multipart mp)
          This method sets the body part's content to a Multipart object.
 void setContent(java.lang.Object o, java.lang.String type)
          A convenience method for setting this body part's content.
 void setContentLanguage(java.lang.String[] languages)
          Set the Content-Language header of this MimePart.
 void setContentMD5(java.lang.String md5)
          Set the "Content-MD5" header field of this body part.
 void setDataHandler(DataHandler dh)
          This method provides the mechanism to set this body part's content.
 void setDescription(java.lang.String description)
          Set the "Content-Description" header field for this body part.
 void setDescription(java.lang.String description, java.lang.String charset)
          Set the "Content-Description" header field for this body part.
 void setDisposition(java.lang.String disposition)
          Set the "Content-Disposition" header field of this body part.
 void setFileName(java.lang.String filename)
          Set the filename associated with this body part, if possible.
 void setHeader(java.lang.String name, java.lang.String value)
          Set the value for this header_name.
 void setText(java.lang.String text)
          Convenience method that sets the given String as this part's content, with a MIME type of "text/plain".
 void setText(java.lang.String text, java.lang.String charset)
          Convenience method that sets the given String as this part's content, with a MIME type of "text/plain" and the specified charset.
protected  void updateHeaders()
          Examine the content of this body part and update the appropriate MIME headers.
 void writeTo(java.io.OutputStream os)
          Output the body part as an RFC 822 format stream.
 
Methods inherited from class javax.mail.BodyPart
getParent
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

dh

protected DataHandler dh
The DataHandler object representing this Part's content.

content

protected byte[] content
Byte array that holds the bytes of the content of this Part.

headers

protected InternetHeaders headers
The InternetHeaders object that stores all the headers of this body part.
Constructor Detail

MimeBodyPart

public MimeBodyPart()
An empty MimeBodyPart object is created. This body part maybe filled in by a client constructing a multipart message.

MimeBodyPart

public MimeBodyPart(java.io.InputStream is)
             throws MessagingException
Constructs a MimeBodyPart by reading and parsing the data from the specified input stream. The parser consumes data till the end of the given input stream. The input stream must start at the beginning of a valid MIME body part and must terminate at the end of that body part.

Note that the "boundary" string that delimits body parts must not be included in the input stream. The intention is that the MimeMultipart parser will extract each body part's bytes from a multipart stream and feed them into this constructor, without the delimiter strings.

Parameters:
is - the body part Input Stream

MimeBodyPart

public MimeBodyPart(InternetHeaders headers,
                    byte[] content)
             throws MessagingException
Constructs a MimeBodyPart using the given header and content bytes.

Used by providers.

Parameters:
headers - The header of this part
content - bytes representing the body of this part.
Method Detail

getSize

public int getSize()
            throws MessagingException
Return the size of the content of this body part in bytes. Return -1 if the size cannot be determined.

Note that this number may not be an exact measure of the content size and may or may not account for any transfer encoding of the content.

This implementation returns -1;

Specified by:
getSize in interface Part
Returns:
size in bytes

getLineCount

public int getLineCount()
                 throws MessagingException
Return the number of lines for the content of this Part. Return -1 if this number cannot be determined.

Note that this number may not be an exact measure of the content length and may or may not account for any transfer encoding of the content.

This implementation returns -1;

Specified by:
getLineCount in interface Part
Following copied from interface: javax.mail.Part
Returns:
number of lines in the content.
Throws:
MessagingException -  

getContentType

public java.lang.String getContentType()
                                throws MessagingException
Returns the value of the RFC 822 "Content-Type" header field. This represents the content type of the content of this body part. This value must not be null. If this field is unavailable, "text/plain" should be returned.

This implementation uses getHeader(name) to obtain the requisite header field.

Specified by:
getContentType in interface Part
Returns:
Content-Type of this body part

isMimeType

public boolean isMimeType(java.lang.String mimeType)
                   throws MessagingException
Is this Part of the specified MIME type? This method compares only the primaryType and subType. The parameters of the content types are ignored.

For example, this method will return true when comparing a Part of content type "text/plain" with "text/plain; charset=foobar".

If the subType of mimeType is the special character '*', then the subtype is ignored during the comparison.

Specified by:
isMimeType in interface Part

getDisposition

public java.lang.String getDisposition()
                                throws MessagingException
Returns the value of the "Content-Disposition" header field. This represents the disposition of this part. The disposition describes how the part should be presented to the user.

If the Content-Disposition field is unavailable, null is returned.

This implementation uses getHeader(name) to obtain the requisite header field.

Specified by:
getDisposition in interface Part
See Also:
headers

setDisposition

public void setDisposition(java.lang.String disposition)
                    throws MessagingException
Set the "Content-Disposition" header field of this body part. If the disposition is null, any existing "Content-Disposition" header field is removed.
Specified by:
setDisposition in interface Part
Throws:
IllegalWriteException - if the underlying implementation does not support modification
java.lang.IllegalStateException - if this body part is obtained from a READ_ONLY folder.

getEncoding

public java.lang.String getEncoding()
                             throws MessagingException
Returns the content transfer encoding from the "Content-Transfer-Encoding" header field. Returns null if the header is unavailable or its value is absent.

This implementation uses getHeader(name) to obtain the requisite header field.

Specified by:
getEncoding in interface MimePart
See Also:
headers

getContentID

public java.lang.String getContentID()
                              throws MessagingException
Returns the value of the "Content-ID" header field. Returns null if the field is unavailable or its value is absent.

This implementation uses getHeader(name) to obtain the requisite header field.

Specified by:
getContentID in interface MimePart
Following copied from interface: javax.mail.internet.MimePart
Returns:
content-ID

getContentMD5

public java.lang.String getContentMD5()
                               throws MessagingException
Return the value of the "Content-MD5" header field. Returns null if this field is unavailable or its value is absent.

This implementation uses getHeader(name) to obtain the requisite header field.

Specified by:
getContentMD5 in interface MimePart
Following copied from interface: javax.mail.internet.MimePart
Returns:
content-MD5

setContentMD5

public void setContentMD5(java.lang.String md5)
                   throws MessagingException
Set the "Content-MD5" header field of this body part.
Specified by:
setContentMD5 in interface MimePart
Throws:
IllegalWriteException - if the underlying implementation does not support modification
java.lang.IllegalStateException - if this body part is obtained from a READ_ONLY folder.

getContentLanguage

public java.lang.String[] getContentLanguage()
                                      throws MessagingException
Get the languages specified in the Content-Language header of this MimePart. The Content-Language header is defined by RFC 1766. Returns null if this header is not available or its value is absent.

This implementation uses getHeader(name) to obtain the requisite header field.

Specified by:
getContentLanguage in interface MimePart

setContentLanguage

public void setContentLanguage(java.lang.String[] languages)
                        throws MessagingException
Set the Content-Language header of this MimePart. The Content-Language header is defined by RFC 1766.
Specified by:
setContentLanguage in interface MimePart
Parameters:
languages - array of language tags

getDescription

public java.lang.String getDescription()
                                throws MessagingException
Returns the "Content-Description" header field of this body part. This typically associates some descriptive information with this part. Returns null if this field is unavailable or its value is absent.

If the Content-Description field is encoded as per RFC 2047, it is decoded and converted into Unicode. If the decoding or conversion fails, the raw data is returned as is.

This implementation uses getHeader(name) to obtain the requisite header field.

Specified by:
getDescription in interface Part
Returns:
content description

setDescription

public void setDescription(java.lang.String description)
                    throws MessagingException
Set the "Content-Description" header field for this body part. If the description parameter is null, then any existing "Content-Description" fields are removed.

If the description contains non US-ASCII characters, it will be encoded using the platform's default charset. If the description contains only US-ASCII characters, no encoding is done and it is used as is.

Note that if the charset encoding process fails, a MessagingException is thrown, and an UnsupportedEncodingException is included in the chain of nested exceptions within the MessagingException.

Specified by:
setDescription in interface Part
Parameters:
description - content description
Throws:
IllegalWriteException - if the underlying implementation does not support modification
java.lang.IllegalStateException - if this body part is obtained from a READ_ONLY folder.
MessagingException. - An UnsupportedEncodingException may be included in the exception chain if the charset conversion fails.

setDescription

public void setDescription(java.lang.String description,
                           java.lang.String charset)
                    throws MessagingException
Set the "Content-Description" header field for this body part. If the description parameter is null, then any existing "Content-Description" fields are removed.

If the description contains non US-ASCII characters, it will be encoded using the specified charset. If the description contains only US-ASCII characters, no encoding is done and it is used as is.

Note that if the charset encoding process fails, a MessagingException is thrown, and an UnsupportedEncodingException is included in the chain of nested exceptions within the MessagingException.

Parameters:
description - Description
charset - Charset for encoding
Throws:
IllegalWriteException - if the underlying implementation does not support modification
java.lang.IllegalStateException - if this body part is obtained from a READ_ONLY folder.
MessagingException. - An UnsupportedEncodingException may be included in the exception chain if the charset conversion fails.

getFileName

public java.lang.String getFileName()
                             throws MessagingException
Get the filename associated with this body part.

Returns the value of the "filename" parameter from the "Content-Disposition" header field of this body part. If its not available, returns the value of the "name" parameter from the "Content-Type" header field of this body part. Returns null if both are absent.

Specified by:
getFileName in interface Part
Returns:
filename

setFileName

public void setFileName(java.lang.String filename)
                 throws MessagingException
Set the filename associated with this body part, if possible.

Sets the "filename" parameter of the "Content-Disposition" header field of this body part.

Specified by:
setFileName in interface Part
Throws:
IllegalWriteException - if the underlying implementation does not support modification
java.lang.IllegalStateException - if this body part is obtained from a READ_ONLY folder.

getInputStream

public java.io.InputStream getInputStream()
                                   throws java.io.IOException,
                                          MessagingException
Return a decoded input stream for this body part's "content".

This implementation obtains the input stream from the DataHandler. That is, it invokes getDataHandler().getInputStream();

Specified by:
getInputStream in interface Part
Returns:
an InputStream
Throws:
MessagingException -  
java.io.IOException - this is typically thrown by the DataHandler. Refer to the documentation for javax.activation.DataHandler for more details.
See Also:
getContentStream(), DataHandler.getInputStream()

getContentStream

protected java.io.InputStream getContentStream()
                                        throws MessagingException
Produce the raw bytes of the content. This method is used when creating a DataHandler object for the content. Subclasses that can provide a separate input stream for just the Part content might want to override this method.

See Also:
content, MimeMessage.getContentStream()

getDataHandler

public DataHandler getDataHandler()
                           throws MessagingException
Return a DataHandler for this body part's content.

The implementation provided here works just like the the implementation in MimeMessage.

Specified by:
getDataHandler in interface Part
See Also:
MimeMessage.getDataHandler()

getContent

public java.lang.Object getContent()
                            throws java.io.IOException,
                                   MessagingException
Return the content as a java object. The type of the object returned is of course dependent on the content itself. For example, the native format of a text/plain content is usually a String object. The native format for a "multipart" content is always a Multipart subclass. For content types that are unknown to the DataHandler system, an input stream is returned as the content.

This implementation obtains the content from the DataHandler. That is, it invokes getDataHandler().getContent();

Specified by:
getContent in interface Part
Returns:
Object
Throws:
MessagingException -  
java.io.IOException - this is typically thrown by the DataHandler. Refer to the documentation for javax.activation.DataHandler for more details.

setDataHandler

public void setDataHandler(DataHandler dh)
                    throws MessagingException
This method provides the mechanism to set this body part's content. The given DataHandler object should wrap the actual content.
Specified by:
setDataHandler in interface Part
Parameters:
dh - The DataHandler for the content
Throws:
IllegalWriteException - if the underlying implementation does not support modification
java.lang.IllegalStateException - if this body part is obtained from a READ_ONLY folder.

setContent

public void setContent(java.lang.Object o,
                       java.lang.String type)
                throws MessagingException
A convenience method for setting this body part's content.

The content is wrapped in a DataHandler object. Note that a DataContentHandler class for the specified type should be available to the JavaMail implementation for this to work right. That is, to do setContent(foobar, "application/x-foobar"), a DataContentHandler for "application/x-foobar" should be installed. Refer to the Java Activation Framework for more information.

Specified by:
setContent in interface Part
Parameters:
o - the content object
type - Mime type of the object
Throws:
IllegalWriteException - if the underlying implementation does not support modification of existing values
java.lang.IllegalStateException - if this body part is obtained from a READ_ONLY folder.

setText

public void setText(java.lang.String text)
             throws MessagingException
Convenience method that sets the given String as this part's content, with a MIME type of "text/plain". If the string contains non US-ASCII characters, it will be encoded using the platform's default charset. The charset is also used to set the "charset" parameter.

Note that there may be a performance penalty if text is large, since this method may have to scan all the characters to determine what charset to use.

If the charset is already known, use the setText() version that takes the charset parameter.

Specified by:
setText in interface MimePart
See Also:
setText(String text, String charset)

setText

public void setText(java.lang.String text,
                    java.lang.String charset)
             throws MessagingException
Convenience method that sets the given String as this part's content, with a MIME type of "text/plain" and the specified charset. The given Unicode string will be charset-encoded using the specified charset. The charset is also used to set the "charset" parameter.
Specified by:
setText in interface MimePart

setContent

public void setContent(Multipart mp)
                throws MessagingException
This method sets the body part's content to a Multipart object.
Specified by:
setContent in interface Part
Parameters:
mp - The multipart object that is the Message's content
Throws:
IllegalWriteException - if the underlying implementation does not support modification of existing values.
java.lang.IllegalStateException - if this body part is obtained from a READ_ONLY folder.

writeTo

public void writeTo(java.io.OutputStream os)
             throws java.io.IOException,
                    MessagingException
Output the body part as an RFC 822 format stream.
Specified by:
writeTo in interface Part
Throws:
MessagingException -  
java.io.IOException - if an error occurs writing to the stream or if an error is generated by the javax.activation layer.
See Also:
DataHandler.writeTo(java.io.OutputStream)

getHeader

public java.lang.String[] getHeader(java.lang.String name)
                             throws MessagingException
Get all the headers for this header_name. Note that certain headers may be encoded as per RFC 2047 if they contain non US-ASCII characters and these should be decoded.
Specified by:
getHeader in interface Part
Parameters:
name - name of header
Returns:
array of headers
See Also:
MimeUtility

getHeader

public java.lang.String getHeader(java.lang.String name,
                                  java.lang.String delimiter)
                           throws MessagingException
Get all the headers for this header name, returned as a single String, with headers separated by the delimiter. If the delimiter is null, only the first header is returned.
Specified by:
getHeader in interface MimePart
Parameters:
header_name - the name of this header
Returns:
the value fields for all headers with this name
Throws:
MessagingException -  

setHeader

public void setHeader(java.lang.String name,
                      java.lang.String value)
               throws MessagingException
Set the value for this header_name. Replaces all existing header values with this new value. Note that RFC 822 headers must contain only US-ASCII characters, so a header that contains non US-ASCII characters must be encoded as per the rules of RFC 2047.
Specified by:
setHeader in interface Part
Parameters:
name - header name
value - header value
See Also:
MimeUtility

addHeader

public void addHeader(java.lang.String name,
                      java.lang.String value)
               throws MessagingException
Add this value to the existing values for this header_name. Note that RFC 822 headers must contain only US-ASCII characters, so a header that contains non US-ASCII characters must be encoded as per the rules of RFC 2047.
Specified by:
addHeader in interface Part
Parameters:
name - header name
value - header value
See Also:
MimeUtility

removeHeader

public void removeHeader(java.lang.String name)
                  throws MessagingException
Remove all headers with this name.
Specified by:
removeHeader in interface Part
Following copied from interface: javax.mail.Part
Parameters:
header_name - the name of this header
Throws:
MessagingException -  
IllegalWriteException - if the underlying implementation does not support modification of existing values
java.lang.IllegalStateException - if this Part is obtained from a READ_ONLY folder

getAllHeaders

public java.util.Enumeration getAllHeaders()
                                    throws MessagingException
Return all the headers from this Message as an Enumeration of Header objects.
Specified by:
getAllHeaders in interface Part
Following copied from interface: javax.mail.Part
Returns:
array of Header objects
Throws:
MessagingException -  

getMatchingHeaders

public java.util.Enumeration getMatchingHeaders(java.lang.String[] names)
                                         throws MessagingException
Return matching headers from this Message as an Enumeration of Header objects.

Specified by:
getMatchingHeaders in interface Part
Following copied from interface: javax.mail.Part
Returns:
array of Header objects
Throws:
MessagingException -  

getNonMatchingHeaders

public java.util.Enumeration getNonMatchingHeaders(java.lang.String[] names)
                                            throws MessagingException
Return non-matching headers from this Message as an Enumeration of Header objects.
Specified by:
getNonMatchingHeaders in interface Part
Following copied from interface: javax.mail.Part
Returns:
array of Header objects
Throws:
MessagingException -  

addHeaderLine

public void addHeaderLine(java.lang.String line)
                   throws MessagingException
Add a header line to this body part
Specified by:
addHeaderLine in interface MimePart
Following copied from interface: javax.mail.internet.MimePart
Throws:
IllegalWriteException - if the underlying implementation does not support modification
java.lang.IllegalStateException - if this Part is obtained from a READ_ONLY folder

getAllHeaderLines

public java.util.Enumeration getAllHeaderLines()
                                        throws MessagingException
Get all header lines as an Enumeration of Strings. A Header line is a raw RFC 822 header line, containing both the "name" and "value" field.
Specified by:
getAllHeaderLines in interface MimePart

getMatchingHeaderLines

public java.util.Enumeration getMatchingHeaderLines(java.lang.String[] names)
                                             throws MessagingException
Get matching header lines as an Enumeration of Strings. A Header line is a raw RFC 822 header line, containing both the "name" and "value" field.
Specified by:
getMatchingHeaderLines in interface MimePart

getNonMatchingHeaderLines

public java.util.Enumeration getNonMatchingHeaderLines(java.lang.String[] names)
                                                throws MessagingException
Get non-matching header lines as an Enumeration of Strings. A Header line is a raw RFC 822 header line, containing both the "name" and "value" field.
Specified by:
getNonMatchingHeaderLines in interface MimePart

updateHeaders

protected void updateHeaders()
                      throws MessagingException
Examine the content of this body part and update the appropriate MIME headers. Typical headers that get set here are Content-Type and Content-Transfer-Encoding. Headers might need to be updated in two cases:
- A message being crafted by a mail application will certainly need to activate this method at some point to fill up its internal headers.
- A message read in from a Store will have obtained all its headers from the store, and so doesn't need this. However, if this message is editable and if any edits have been made to either the content or message structure, we might need to resync our headers.
In both cases this method is typically called by the Message.saveChanges method.
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