The DataSource interface provides the JavaBeans Activation Framework
with an abstraction of an arbitrary collection of data. It
provides a type for that data as well as access
to it in the form of InputStreams and
OutputStreams where appropriate.
This method returns an InputStream representing
the data and throws the appropriate exception if it can
not do so. Note that a new InputStream object must be
returned each time this method is called, and the stream must be
positioned at the beginning of the data.
This method returns an OutputStream where the
data can be written and throws the appropriate exception if it can
not do so. Note that a new OutputStream object must
be returned each time this method is called, and the stream must
be positioned at the location the data is to be written.
This method returns the MIME type of the data in the form of a
string. It should always return a valid type. It is suggested
that getContentType return "application/octet-stream" if the
DataSource implementation can not determine the data type.
Return the name of this object where the name of the object
is dependant on the nature of the underlying objects. DataSources
encapsulating files may choose to return the filename of the object.
(Typically this would be the last component of the filename, not an
the name of the object.
Copyright 2003 Sun Microsystems, Inc. All rights reserved