messageelement.html

jxta的api库

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<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>
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<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
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<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>

  <p/>Returns a String representation of the element data. The
  <code>'charset'</code> parameter of the message element's mimetype, if
  any, is used to determine encoding. If the charset specified is
  unsupported then the default enconding will be used.

  <p/>synchronized for caching purposes.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getElementName()"><!-- --></A><H3>
getElementName</H3>
<PRE>
public java.lang.String <B>getElementName</B>()</PRE>
<DL>
<DD>Returns the name of the MessageElement. Unnamed elements will return
  the empty string ("");
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>String containing the name of the MessageElement.</DL>
</DD>
</DL>
<HR>

<A NAME="getMimeType()"><!-- --></A><H3>
getMimeType</H3>
<PRE>
public <A HREF="../../../net/jxta/document/MimeMediaType.html" title="class in net.jxta.document">MimeMediaType</A> <B>getMimeType</B>()</PRE>
<DL>
<DD>Returns the MIME Media type of this <code>Document</code> per
 <a href="http://www.ietf.org/rfc/rfc2046.txt" target="_blank">IETF RFC 2046 <i>MIME : Media Types</i></a>.

 <p/>JXTA does not currently support the '<code>Multipart</code>' or
 '<code>Message</code>' media types.

  <p/>Will return "Application/Octet-Stream" if no type was originally
   specified.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../net/jxta/document/Document.html#getMimeType()">getMimeType</A></CODE> in interface <CODE><A HREF="../../../net/jxta/document/Document.html" title="interface in net.jxta.document">Document</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>A MimeMediaType object containing the MIME Media Type for this
 <code>Document</code>.</DL>
</DD>
</DL>
<HR>

<A NAME="getFileExtension()"><!-- --></A><H3>
getFileExtension</H3>
<PRE>
public java.lang.String <B>getFileExtension</B>()</PRE>
<DL>
<DD>Returns the file extension type used by this <code>Document</code>. This
 value is usually chosen based upon the MIME Media Type.

 <p/>We use the "unknown" extension and leave it to sub-classes to
 extend this. If we had a mailcap facility we could do better
 classification based on mimetype.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../net/jxta/document/Document.html#getFileExtension()">getFileExtension</A></CODE> in interface <CODE><A HREF="../../../net/jxta/document/Document.html" title="interface in net.jxta.document">Document</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>A String containing an appropriate file extension for this
 <code>Document</code>.</DL>
</DD>
</DL>
<HR>

<A NAME="getByteLength()"><!-- --></A><H3>
getByteLength</H3>
<PRE>
public long <B>getByteLength</B>()</PRE>
<DL>
<DD>Returns the size of the element data in bytes.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>long containing the size of the element data.</DL>
</DD>
</DL>
<HR>

<A NAME="getBytes(boolean)"><!-- --></A><H3>
getBytes</H3>
<PRE>
public byte[] <B>getBytes</B>(boolean&nbsp;copy)</PRE>
<DL>
<DD>Returns a byte array which contains the element data. The byte array
  returned <b>may be shared amongst all copies of the element</b>,
  do not modify it. The <code>copy</code> parameter allows you to request a
  private, modifiable copy of the element data.

  <p/>This implementation builds the byte array from the stream.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>copy</CODE> - If true then the result can be modified without damaging the state of this
 MessageElement. If false, then the result may be a shared copy of the data and
 should be considered read-only.
<DT><B>Returns:</B><DD>byte[] Contents of message element.</DL>
</DD>
</DL>
<HR>

<A NAME="sendToStream(java.io.OutputStream)"><!-- --></A><H3>
sendToStream</H3>
<PRE>
public void <B>sendToStream</B>(java.io.OutputStream&nbsp;sendTo)
                  throws java.io.IOException</PRE>
<DL>
<DD>Send the contents of this <code>Document</code> to the specified stream.

 <p/>This version probably has sub-optimal performance. Sub-classes
 should override this implementation.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../net/jxta/document/Document.html#sendToStream(java.io.OutputStream)">sendToStream</A></CODE> in interface <CODE><A HREF="../../../net/jxta/document/Document.html" title="interface in net.jxta.document">Document</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>sendTo</CODE> - The OutputStream to which the <code>Document</code> will
 be written.
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if an I/O error occurs.</DL>
</DD>
</DL>
<HR>

<A NAME="getSignature()"><!-- --></A><H3>
getSignature</H3>
<PRE>
public <A HREF="../../../net/jxta/endpoint/MessageElement.html" title="class in net.jxta.endpoint">MessageElement</A> <B>getSignature</B>()</PRE>
<DL>
<DD>Returns the element containing the digest/digital signature for
  this element
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>Element containing the digital signature.</DL>
</DD>
</DL>
<HR>

<A NAME="setElementProperty(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
setElementProperty</H3>
<PRE>
public java.lang.Object <B>setElementProperty</B>(java.lang.Object&nbsp;key,
                                           java.lang.Object&nbsp;value)</PRE>
<DL>
<DD>associate a transient property with this element. if there was a previous
  value for the key provided then it is returned. This feature is useful for
  managing the state of element during processing.

  <p/>The setting of particular keys may be controlled by a Java Security
  Manager. Keys of type 'java.lang.Class' are checked against the caller of
  this method. Only callers which are instances of the key class may modify
  the property. This check is not possible through reflection. All other
  types of keys are unchecked.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - the property key<DD><CODE>value</CODE> - the value for the property
<DT><B>Returns:</B><DD>previous value for the property or null if no previous</DL>
</DD>
</DL>
<HR>

<A NAME="getElementProperty(java.lang.Object)"><!-- --></A><H3>
getElementProperty</H3>
<PRE>
public java.lang.Object <B>getElementProperty</B>(java.lang.Object&nbsp;key)</PRE>
<DL>
<DD>retrieves a transient property from the set for this element.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - the property key.
<DT><B>Returns:</B><DD>value for the property or null if no property for this key.</DL>
</DD>
</DL>
<HR>

<A NAME="copyInputStreamToOutputStream(java.io.InputStream, java.io.OutputStream)"><!-- --></A><H3>
copyInputStreamToOutputStream</H3>
<PRE>
protected static void <B>copyInputStreamToOutputStream</B>(java.io.InputStream&nbsp;source,
                                                    java.io.OutputStream&nbsp;sink)
                                             throws java.io.IOException</PRE>
<DL>
<DD>Copies an input stream to an output stream with buffering.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>source</CODE> - The stream to copy from.<DD><CODE>sink</CODE> - The stream to send the data to.
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there is a problem copying the data</DL>
</DD>
</DL>
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