MimePartDataSource (JavaMail API documentation)
Date: 2018-10-22

javax.mail.internet

## Class MimePartDataSource

- java.lang.Object
- - javax.mail.internet.MimePartDataSource

- All Implemented Interfaces:
    javax.activation.DataSource, MessageAware

      public class MimePartDataSource
      extends java.lang.Object
      implements javax.activation.DataSource, MessageAware

  A utility class that implements a DataSource out of a MimePart. This class is primarily meant for service providers.
  See Also:
    `MimePart`, `DataSource`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected MimePart` | `part` The MimePart that provides the data for this DataSource.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `MimePartDataSource(MimePart part)` Constructor, that constructs a DataSource from a MimePart.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `java.lang.String` | `getContentType()` Returns the content-type of this DataSource.
    `java.io.InputStream` | `getInputStream()` Returns an input stream from this MimePart.
    `MessageContext` | `getMessageContext()` Return the `MessageContext` for the current part.
    `java.lang.String` | `getName()` DataSource method to return a name.
    `java.io.OutputStream` | `getOutputStream()` DataSource method to return an output stream.

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### part

          protected MimePart part

      The MimePart that provides the data for this DataSource.
      Since:
        JavaMail 1.4

  - ### Constructor Detail

    - #### MimePartDataSource

          public MimePartDataSource(MimePart part)

      Constructor, that constructs a DataSource from a MimePart.

  - ### Method Detail

    - #### getInputStream

          public java.io.InputStream getInputStream()
                                             throws java.io.IOException

      Returns an input stream from this MimePart.

      This method applies the appropriate transfer-decoding, based on the Content-Transfer-Encoding attribute of this MimePart. Thus the returned input stream is a decoded stream of bytes.

      This implementation obtains the raw content from the Part using the `getContentStream()` method and decodes it using the `MimeUtility.decode()` method.

      Specified by:
        `getInputStream` in interface `javax.activation.DataSource`
      Returns:
        decoded input stream
      Throws:
        `java.io.IOException`
      See Also:
        `MimeMessage.getContentStream()`, `MimeBodyPart.getContentStream()`, `MimeUtility.decode(java.io.InputStream, java.lang.String)`

    - #### getOutputStream

          public java.io.OutputStream getOutputStream()
                                               throws java.io.IOException

      DataSource method to return an output stream.

      This implementation throws the UnknownServiceException.

      Specified by:
        `getOutputStream` in interface `javax.activation.DataSource`
      Throws:
        `java.io.IOException`

    - #### getContentType

          public java.lang.String getContentType()

      Returns the content-type of this DataSource.

      This implementation just invokes the `getContentType` method on the MimePart.

      Specified by:
        `getContentType` in interface `javax.activation.DataSource`

    - #### getName

          public java.lang.String getName()

      DataSource method to return a name.

      This implementation just returns an empty string.

      Specified by:
        `getName` in interface `javax.activation.DataSource`

    - #### getMessageContext

          public MessageContext getMessageContext()

      Return the `MessageContext` for the current part.
      Specified by:
        `getMessageContext` in interface `MessageAware`
      Since:
        JavaMail 1.1

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