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Java 2 Platform EE v1.3: Interface DataSource
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javax.activation</FONT>
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Interface DataSource</H2>
<DL>
<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../javax/mail/MultipartDataSource.html">MultipartDataSource</A></DD>
</DL>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../javax/mail/internet/MimePartDataSource.html">MimePartDataSource</A>, <A HREF="../../javax/activation/URLDataSource.html">URLDataSource</A>, <A HREF="../../javax/activation/FileDataSource.html">FileDataSource</A></DD>
</DL>
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<DL>
<DT>public interface <B>DataSource</B></DL>
<P>
The DataSource interface provides the JavaBeans Activation Framework
with an abstraction of some arbitrary collection of data. It
provides a type for that data as well as access
to it in the form of <code>InputStreams</code> and
<code>OutputStreams</code> where appropriate.
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<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/activation/DataSource.html#getContentType()">getContentType</A></B>()</CODE>
<BR>
This method returns the MIME type of the data in the form of a
string.</TD>
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<CODE> java.io.InputStream</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/activation/DataSource.html#getInputStream()">getInputStream</A></B>()</CODE>
<BR>
This method returns an <code>InputStream</code> representing the
the data and throws the appropriate exception if it can
not do so.</TD>
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<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/activation/DataSource.html#getName()">getName</A></B>()</CODE>
<BR>
Return the <i>name</i> of this object where the name of the object
is dependant on the nature of the underlying objects.</TD>
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<CODE> java.io.OutputStream</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/activation/DataSource.html#getOutputStream()">getOutputStream</A></B>()</CODE>
<BR>
This method returns an <code>OutputStream</code> where the
data can be written and throws the appropriate exception if it can
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<A NAME="getInputStream()"><!-- --></A><H3>
getInputStream</H3>
<PRE>
public java.io.InputStream <B>getInputStream</B>()
throws java.io.IOException</PRE>
<DL>
<DD>This method returns an <code>InputStream</code> representing the
the data and throws the appropriate exception if it can
not do so. Note that a new <code>InputStream</code> object must be
returned each time this method is called, and the stream must be
positioned at the beginning of the data.<DD><DL>
<DT><B>Returns:</B><DD>an InputStream</DL>
</DD>
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<A NAME="getOutputStream()"><!-- --></A><H3>
getOutputStream</H3>
<PRE>
public java.io.OutputStream <B>getOutputStream</B>()
throws java.io.IOException</PRE>
<DL>
<DD>This method returns an <code>OutputStream</code> where the
data can be written and throws the appropriate exception if it can
not do so. Note that a new <code>OutputStream</code> 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.<DD><DL>
<DT><B>Returns:</B><DD>an OutputStream</DL>
</DD>
</DL>
<HR>
<A NAME="getContentType()"><!-- --></A><H3>
getContentType</H3>
<PRE>
public java.lang.String <B>getContentType</B>()</PRE>
<DL>
<DD>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.<DD><DL>
<DT><B>Returns:</B><DD>the MIME Type</DL>
</DD>
</DL>
<HR>
<A NAME="getName()"><!-- --></A><H3>
getName</H3>
<PRE>
public java.lang.String <B>getName</B>()</PRE>
<DL>
<DD>Return the <i>name</i> 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
entire pathname.)<DD><DL>
<DT><B>Returns:</B><DD>the name of the object.</DL>
</DD>
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