Multipart (JavaMail API documentation)
Date: 2016-12-03

javax.mail

## Class Multipart

- java.lang.Object
- - javax.mail.Multipart

- Direct Known Subclasses:
    MimeMultipart

      public abstract class Multipart
      extends java.lang.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 and Description
    --- | ---
    `protected java.lang.String` | `contentType` This field specifies the content-type of this multipart object.
    `protected Part` | `parent` The `Part` containing this `Multipart`, if known.
    `protected java.util.Vector` | `parts` Vector of BodyPart objects.

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `Multipart()` Default constructor.

  - ### Method Summary

    Methods
    Modifier and Type | Method and 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.
    `java.lang.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.
    `boolean` | `removeBodyPart(BodyPart part)` Remove the specified part from the multipart message.
    `void` | `removeBodyPart(int index)` Remove the part at specified location (starting from 0).
    `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(java.io.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 Detail

    - #### parts

          protected java.util.Vector parts

      Vector of BodyPart objects.

    - #### contentType

          protected java.lang.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

  - ### Constructor Detail

    - #### Multipart

          protected Multipart()

      Default constructor. An empty Multipart object is created.

  - ### Method Detail

    - #### 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 java.lang.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:
        `java.lang.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:
        `java.lang.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(java.io.OutputStream os)
                                throws java.io.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:
        `java.io.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

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