Module jakarta.mail

Package jakarta.mail

Class Multipart

java.lang.Object

jakarta.mail.Multipart

Direct Known Subclasses:

MimeMultipart

public abstract class Multipart
extends Object

Multipart is a container that holds multiple body parts. Multipart provides methods to retrieve and set its subparts.

Multipart also acts as the base class for the content object returned by most Multipart DataContentHandlers. For example, invoking getContent() on a DataHandler whose source is a "multipart/signed" data source may return an appropriate subclass of Multipart.

Some messaging systems provide different subtypes of Multiparts. For example, MIME specifies a set of subtypes that include "alternative", "mixed", "related", "parallel", "signed", etc.

Multipart is an abstract class. Subclasses provide actual implementations.

Field Summary

Fields

Modifier and Type	Field	Description
protected String	contentType	This field specifies the content-type of this multipart object.
protected Part	parent	The Part containing this Multipart, if known.
protected Vector<BodyPart>	parts	Vector of BodyPart objects.
protected final StreamProvider	streamProvider	Instance of stream provider.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Multipart()	Default constructor.

Method Summary

Modifier and Type	Method	Description
void	addBodyPart(BodyPart part)	Adds a Part to the multipart.
void	addBodyPart(BodyPart part, int index)	Adds a BodyPart at position index.
BodyPart	getBodyPart(int index)	Get the specified Part.
String	getContentType()	Return the content-type of this Multipart.
int	getCount()	Return the number of enclosed BodyPart objects.
Part	getParent()	Return the Part that contains this Multipart object, or null if not known.
void	removeBodyPart(int index)	Remove the part at specified location (starting from 0).
boolean	removeBodyPart(BodyPart part)	Remove the specified part from the multipart message.
protected void	setMultipartDataSource(MultipartDataSource mp)	Setup this Multipart object from the given MultipartDataSource.
void	setParent(Part parent)	Set the parent of this Multipart to be the specified Part.
abstract void	writeTo(OutputStream os)	Output an appropriately encoded bytestream to the given OutputStream.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

parts

protected Vector<BodyPart> parts

Vector of BodyPart objects.

contentType

protected String contentType

This field specifies the content-type of this multipart object. It defaults to "multipart/mixed".

parent

protected Part parent

The Part containing this Multipart, if known.

Since:

JavaMail 1.1

streamProvider

protected final StreamProvider streamProvider

Instance of stream provider.

Since:

JavaMail 2.1

Constructor Details

Multipart

protected Multipart()

Default constructor. An empty Multipart object is created.

Method Details

setMultipartDataSource

protected void setMultipartDataSource(MultipartDataSource mp)
                               throws MessagingException

Setup this Multipart object from the given MultipartDataSource.

The method adds the MultipartDataSource's BodyPart objects into this Multipart. This Multipart's contentType is set to that of the MultipartDataSource.

This method is typically used in those cases where one has a multipart data source that has already been pre-parsed into the individual body parts (for example, an IMAP datasource), but needs to create an appropriate Multipart subclass that represents a specific multipart subtype.

Parameters:

mp - Multipart datasource

Throws:

MessagingException - for failures

getContentType

public String getContentType()

Return the content-type of this Multipart.

This implementation just returns the value of the contentType field.

Returns:

content-type

See Also:

• contentType

getCount

public int getCount()
             throws MessagingException

Return the number of enclosed BodyPart objects.

Returns:

number of parts

Throws:

MessagingException - for failures

See Also:

• parts

getBodyPart

public BodyPart getBodyPart(int index)
                     throws MessagingException

Get the specified Part. Parts are numbered starting at 0.

Parameters:

index - the index of the desired Part

Returns:

the Part

Throws:

IndexOutOfBoundsException - if the given index is out of range.

MessagingException - for other failures

removeBodyPart

public boolean removeBodyPart(BodyPart part)
                       throws MessagingException

Remove the specified part from the multipart message. Shifts all the parts after the removed part down one.

Parameters:

part - The part to remove

Returns:

true if part removed, false otherwise

Throws:

MessagingException - if no such Part exists

IllegalWriteException - if the underlying implementation does not support modification of existing values

removeBodyPart

public void removeBodyPart(int index)
                    throws MessagingException

Remove the part at specified location (starting from 0). Shifts all the parts after the removed part down one.

Parameters:

index - Index of the part to remove

Throws:

IndexOutOfBoundsException - if the given index is out of range.

IllegalWriteException - if the underlying implementation does not support modification of existing values

MessagingException - for other failures

addBodyPart

public void addBodyPart(BodyPart part)
                 throws MessagingException

Adds a Part to the multipart. The BodyPart is appended to the list of existing Parts.

Parameters:

part - The Part to be appended

Throws:

IllegalWriteException - if the underlying implementation does not support modification of existing values

MessagingException - for other failures

addBodyPart

public void addBodyPart(BodyPart part,
 int index)
                 throws MessagingException

Adds a BodyPart at position index. If index is not the last one in the list, the subsequent parts are shifted up. If index is larger than the number of parts present, the BodyPart is appended to the end.

Parameters:

part - The BodyPart to be inserted

index - Location where to insert the part

Throws:

IllegalWriteException - if the underlying implementation does not support modification of existing values

MessagingException - for other failures

writeTo

public abstract void writeTo(OutputStream os)
                      throws IOException,
MessagingException

Output an appropriately encoded bytestream to the given OutputStream. The implementation subclass decides the appropriate encoding algorithm to be used. The bytestream is typically used for sending.

Parameters:

os - the stream to write to

Throws:

IOException - if an IO related exception occurs

MessagingException - for other failures

getParent

public Part getParent()

Return the Part that contains this Multipart object, or null if not known.

Returns:

the parent Part

Since:

JavaMail 1.1

setParent

public void setParent(Part parent)

Set the parent of this Multipart to be the specified Part. Normally called by the Message or BodyPart setContent(Multipart) method. parent may be null if the Multipart is being removed from its containing Part.

Parameters:

parent - the parent Part

Since:

JavaMail 1.1