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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Apr 27 23:35:54 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class AccessControlContext</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <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/AccessControlContext.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-files/index-1.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><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. Ed. v1.3</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> PREV CLASS <A HREF="../../java/security/AccessController.html"><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="AccessControlContext.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | 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><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">java.security</FONT><BR>Class AccessControlContext</H2><PRE><A HREF="../../java/lang/Object.html">java.lang.Object</A> | +--<B>java.security.AccessControlContext</B></PRE><HR><DL><DT>public final class <B>AccessControlContext</B><DT>extends <A HREF="../../java/lang/Object.html">Object</A></DL><P>An AccessControlContext is used to make system resource access decisions based on the context it encapsulates. <p>More specifically, it encapsulates a context and has a single method, <code>checkPermission</code>, that is equivalent to the <code>checkPermission</code> method in the AccessController class, with one difference: The AccessControlContext <code>checkPermission</code> method makes access decisions based on the context it encapsulates, rather than that of the current execution thread. <p>Thus, the purpose of AccessControlContext is for those situations where a security check that should be made within a given context actually needs to be done from within a <i>different</i> context (for example, from within a worker thread). <p> An AccessControlContext is created by calling the <code>AccessController.getContext</code> method. The <code>getContext</code> method takes a "snapshot" of the current calling context, and places it in an AccessControlContext object, which it returns. A sample call is the following: <pre> AccessControlContext acc = AccessController.getContext() </pre> <p> Code within a different context can subsequently call the <code>checkPermission</code> method on the previously-saved AccessControlContext object. A sample call is the following: <pre> acc.checkPermission(permission) </pre><P><DL><DT><B>See Also: </B><DD><A HREF="../../java/security/AccessController.html"><CODE>AccessController</CODE></A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><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="../../java/security/AccessControlContext.html#AccessControlContext(java.security.AccessControlContext, java.security.DomainCombiner)">AccessControlContext</A></B>(<A HREF="../../java/security/AccessControlContext.html">AccessControlContext</A> acc, <A HREF="../../java/security/DomainCombiner.html">DomainCombiner</A> combiner)</CODE><BR> Create a new <code>AccessControlContext</code> with the given <code>AccessControlContext</code> and <code>DomainCombiner</code>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/security/AccessControlContext.html#AccessControlContext(java.security.ProtectionDomain[])">AccessControlContext</A></B>(<A HREF="../../java/security/ProtectionDomain.html">ProtectionDomain</A>[] context)</CODE><BR> Create an AccessControlContext with the given set of ProtectionDomains.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><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="../../java/security/AccessControlContext.html#checkPermission(java.security.Permission)">checkPermission</A></B>(<A HREF="../../java/security/Permission.html">Permission</A> perm)</CODE><BR> Determines whether the access request indicated by the specified permission should be allowed or denied, based on the security policy currently in effect, and the context in this object.</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="../../java/security/AccessControlContext.html#equals(java.lang.Object)">equals</A></B>(<A HREF="../../java/lang/Object.html">Object</A> obj)</CODE><BR> Checks two AccessControlContext objects for equality.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/security/DomainCombiner.html">DomainCombiner</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/security/AccessControlContext.html#getDomainCombiner()">getDomainCombiner</A></B>()</CODE><BR> Get the <code>DomainCombiner</code> associated with this <code>AccessControlContext</code>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/security/AccessControlContext.html#hashCode()">hashCode</A></B>()</CODE><BR> Returns the hash code value for this context.</TD></TR></TABLE>⌨️ 快捷键说明
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