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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><TITLE>Message (Project JXTA J2SE)</TITLE><META NAME="keywords" CONTENT="net.jxta.endpoint.Message class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Message (Project JXTA J2SE)";}</SCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/Message.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><a href='http://www.jxta.org' target='_blank'>Project JXTA</a></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../net/jxta/endpoint/InputStreamMessageElement.html" title="class in net.jxta.endpoint"><B>PREV CLASS</B></A> <A HREF="../../../net/jxta/endpoint/Message.element.html" title="class in net.jxta.endpoint"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="Message.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: <A HREF="#nested_class_summary">NESTED</A> | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">net.jxta.endpoint</FONT><BR>Class Message</H2><PRE>java.lang.Object <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><B>net.jxta.endpoint.Message</B></PRE><HR><DL><DT>public class <B>Message</B><DT>extends java.lang.Object</DL><P>Messages are containers for protocol messages within JXTA. Services and applications are expected to use Messages as the basis for any protocols implemented within JXTA. Messages are exchanged through the <A HREF="../../../net/jxta/endpoint/EndpointService.html" title="interface in net.jxta.endpoint"><CODE>EndpointService</CODE></A> or <A HREF="../../../net/jxta/pipe/PipeService.html" title="interface in net.jxta.pipe"><CODE>PipeService</CODE></A>. <p/>A Message is composed of an ordered list of zero or more <A HREF="../../../net/jxta/endpoint/MessageElement.html" title="class in net.jxta.endpoint"><CODE>MessageElements</CODE></A>. Each <A HREF="../../../net/jxta/endpoint/MessageElement.html" title="class in net.jxta.endpoint"><CODE>MessageElement</CODE></A> is associated with a namespace at the time it is added to the message. Duplicate <A HREF="../../../net/jxta/endpoint/MessageElement.html" title="class in net.jxta.endpoint"><CODE>MessageElements</CODE></A> are permitted. <p/><b>Messages are not synchronized. All of the iterators returned by this implementation are "fail-fast". Concurrent modification from multiple threads will produce unexpected results.</b><P><P><DL><DT><B>See Also:</B><DD><A HREF="../../../net/jxta/endpoint/MessageElement.html" title="class in net.jxta.endpoint"><CODE>MessageElement</CODE></A>, <A HREF="../../../net/jxta/endpoint/EndpointAddress.html" title="class in net.jxta.endpoint"><CODE>EndpointAddress</CODE></A>, <A HREF="../../../net/jxta/endpoint/EndpointService.html" title="interface in net.jxta.endpoint"><CODE>EndpointService</CODE></A>, <A HREF="../../../net/jxta/pipe/InputPipe.html" title="interface in net.jxta.pipe"><CODE>InputPipe</CODE></A>, <A HREF="../../../net/jxta/pipe/OutputPipe.html" title="interface in net.jxta.pipe"><CODE>OutputPipe</CODE></A>, <A HREF="../../../net/jxta/pipe/PipeService.html" title="interface in net.jxta.pipe"><CODE>PipeService</CODE></A></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><A NAME="nested_class_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Nested Class Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static class</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.element.html" title="class in net.jxta.endpoint">Message.element</A></B></CODE><BR> holds an element and its namespace</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> class</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.ElementIterator.html" title="class in net.jxta.endpoint">Message.ElementIterator</A></B></CODE><BR> A ListIterator which also provides the ability to determine the namespace of the current element. </TD></TR></TABLE> <!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#cachedByteLength">cachedByteLength</A></B></CODE><BR> cached aggregate size of all the memeber elements. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#cachedByteLengthModCount">cachedByteLengthModCount</A></B></CODE><BR> modcount at the time the message length was last calculated. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#defaultNamespace">defaultNamespace</A></B></CODE><BR> This string identifies the namespace which is assumed when calls are made that don't include a namespace specification.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected java.util.List</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#elements">elements</A></B></CODE><BR> List of the elements. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected java.util.List</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#lineage">lineage</A></B></CODE><BR> A list of <CODE>Integer</CODE> which details the lineage (history of cloning) that produced this message. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#LOG_MODIFICATIONS">LOG_MODIFICATIONS</A></B></CODE><BR> If true, then modification logging be activated. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#modCount">modCount</A></B></CODE><BR> Modification count of this message. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected java.util.List</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#modHistory">modHistory</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#modifiable">modifiable</A></B></CODE><BR> <B>Deprecated.</B> <I>You really should not depend on this feature.</I></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected java.util.Map</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#namespaces">namespaces</A></B></CODE><BR> the namespaces in this message and the elements in each. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected java.util.Map</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#properties">properties</A></B></CODE><BR> Message properties HashMap keys are <CODE>Object</CODE> values are <CODE>Object</CODE> </TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> </CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#Message()">Message</A></B>()</CODE><BR> Standard Constructor for messages. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected </CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#Message(java.lang.String)">Message</A></B>(java.lang.String defaultNamespace)</CODE><BR> Standard Constructor for messages.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#addMessageElement(net.jxta.endpoint.MessageElement)">addMessageElement</A></B>(<A HREF="../../../net/jxta/endpoint/MessageElement.html" title="class in net.jxta.endpoint">MessageElement</A> add)</CODE><BR> Add a MessageElement into the message. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#addMessageElement(java.lang.String, net.jxta.endpoint.MessageElement)">addMessageElement</A></B>(java.lang.String namespace, <A HREF="../../../net/jxta/endpoint/MessageElement.html" title="class in net.jxta.endpoint">MessageElement</A> add)</CODE><BR> Add a MessageElement into the message using the specified namespace.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#clear()">clear</A></B>()</CODE><BR> Removes all of the elements in all namespaces from the message. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.Object</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#clone()">clone</A></B>()</CODE><BR> <p/>Duplicates the Message. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#equals(java.lang.Object)">equals</A></B>(java.lang.Object target)</CODE><BR> Compare this Message against another. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../net/jxta/endpoint/Message.html#getByteLength()">getByteLength</A></B>()</CODE><BR> Returns the aggregate size of all the memeber elements.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">⌨️ 快捷键说明
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