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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><!-- Generated by javadoc (build 1.4.2_02) on Thu Nov 13 17:20:41 PST 2003 --><TITLE>FetchProfile (Java 2 Platform Ent. Ed. v1.4)</TITLE><META NAME="keywords" CONTENT="javax.mail.FetchProfile class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="FetchProfile (Java 2 Platform Ent. 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Ed. v1.4</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../javax/mail/BodyPart.html" title="class in javax.mail"><B>PREV CLASS</B></A> <A HREF="../../javax/mail/FetchProfile.Item.html" title="class in javax.mail"><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="FetchProfile.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> | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <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">javax.mail</FONT><BR>Class FetchProfile</H2><PRE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A> <IMG SRC="../../resources/inherit.gif" ALT="extended by"><B>javax.mail.FetchProfile</B></PRE><HR><DL><DT>public class <B>FetchProfile</B><DT>extends <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL><P>Clients use a FetchProfile to list the Message attributes that it wishes to prefetch from the server for a range of messages.<p> Messages obtained from a Folder are light-weight objects that typically start off as empty references to the actual messages. Such a Message object is filled in "on-demand" when the appropriate get*() methods are invoked on that particular Message. Certain server-based message access protocols (Ex: IMAP) allow batch fetching of message attributes for a range of messages in a single request. Clients that want to use message attributes for a range of Messages (Example: to display the top-level headers in a headerlist) might want to use the optimization provided by such servers. The <code>FetchProfile</code> allows the client to indicate this desire to the server. <p> Note that implementations are not obligated to support FetchProfiles, since there might be cases where the backend service does not allow easy, efficient fetching of such profiles. <p> Sample code that illustrates the use of a FetchProfile is given below: <p> <blockquote> <pre> Message[] msgs = folder.getMessages(); FetchProfile fp = new FetchProfile(); fp.add(FetchProfile.Item.ENVELOPE); fp.add("X-mailer"); folder.fetch(msgs, fp); </pre></blockquote><p><P><P><DL><DT><B>Author:</B></DT> <DD>John Mani, Bill Shannon</DD><DT><B>See Also:</B><DD><A HREF="../../javax/mail/Folder.html#fetch(javax.mail.Message[], javax.mail.FetchProfile)"><CODE>Folder.fetch(javax.mail.Message[], javax.mail.FetchProfile)</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>static class</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/mail/FetchProfile.Item.html" title="class in javax.mail">FetchProfile.Item</A></B></CODE><BR> This inner class is the base class of all items that can be requested in a FetchProfile. </TD></TR></TABLE> <!-- =========== FIELD SUMMARY =========== --><!-- ======== 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><CODE><B><A HREF="../../javax/mail/FetchProfile.html#FetchProfile()">FetchProfile</A></B>()</CODE><BR> Create an empty FetchProfile.</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="../../javax/mail/FetchProfile.html#add(javax.mail.FetchProfile.Item)">add</A></B>(<A HREF="../../javax/mail/FetchProfile.Item.html" title="class in javax.mail">FetchProfile.Item</A> item)</CODE><BR> Add the given special item as one of the attributes to be prefetched.</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="../../javax/mail/FetchProfile.html#add(java.lang.String)">add</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> headerName)</CODE><BR> Add the specified header-field to the list of attributes to be prefetched.</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="../../javax/mail/FetchProfile.html#contains(javax.mail.FetchProfile.Item)">contains</A></B>(<A HREF="../../javax/mail/FetchProfile.Item.html" title="class in javax.mail">FetchProfile.Item</A> item)</CODE><BR> Returns true if the fetch profile contains given special item.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD>⌨️ 快捷键说明
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