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Java 2 Platform EE v1.3: Class SubjectDomainCombiner
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javax.security.auth</FONT>
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Class SubjectDomainCombiner</H2>
<PRE>
java.lang.Object
|
+--<B>javax.security.auth.SubjectDomainCombiner</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD>java.security.DomainCombiner</DD>
</DL>
<HR>
<DL>
<DT>public class <B>SubjectDomainCombiner</B><DT>extends java.lang.Object<DT>implements java.security.DomainCombiner</DL>
<P>
A <code>SubjectDomainCombiner</code> updates the
ProtectionDomains affiliated with an <code>AccessControlContext</code>
with the relevant Subject-based Permissions configured in the
<code>java.security.auth.Policy</code>.
<p> If the <code>Security</code> property, <i>cache.auth.policy</i>,
either is not set, or if it is set to <i>true</i>, then this
<code>SubjectDomainCombiner</code> implementation caches
policy information. Otherwise, this <code>SubjectDomainCombiner</code>
implementation refrains from performing any caching.
The <i>cache.auth.policy</i> property may be set in the Security
properties file, located in the file named
<JAVA_HOME>/lib/security/java.security, where <JAVA_HOME>
refers to the directory where the SDK was installed.
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<TD><CODE><B><A HREF="../../../javax/security/auth/SubjectDomainCombiner.html#SubjectDomainCombiner(javax.security.auth.Subject)">SubjectDomainCombiner</A></B>(<A HREF="../../../javax/security/auth/Subject.html">Subject</A> subject)</CODE>
<BR>
Associate the provided <code>Subject</code> with this
<code>SubjectDomainCombiner</code>.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.security.ProtectionDomain[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/security/auth/SubjectDomainCombiner.html#combine(java.security.ProtectionDomain[], java.security.ProtectionDomain[])">combine</A></B>(java.security.ProtectionDomain[] currentDomains,
java.security.ProtectionDomain[] assignedDomains)</CODE>
<BR>
Update the provided ProtectionDomains with the relevant
Subject-based Permissions.</TD>
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<CODE> <A HREF="../../../javax/security/auth/Subject.html">Subject</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/security/auth/SubjectDomainCombiner.html#getSubject()">getSubject</A></B>()</CODE>
<BR>
Get the <code>Subject</code> associated with this
<code>SubjectDomainCombiner</code>.</TD>
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<TD><B>Methods inherited from class java.lang.Object</B></TD>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="SubjectDomainCombiner(javax.security.auth.Subject)"><!-- --></A><H3>
SubjectDomainCombiner</H3>
<PRE>
public <B>SubjectDomainCombiner</B>(<A HREF="../../../javax/security/auth/Subject.html">Subject</A> subject)</PRE>
<DL>
<DD>Associate the provided <code>Subject</code> with this
<code>SubjectDomainCombiner</code>.
<p><DD><DL>
<DT><B>Parameters:</B><DD><CODE>subject</CODE> - the <code>Subject</code> to be associated with
with this <code>SubjectDomainCombiner</code>.</DL>
</DD>
</DL>
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<A NAME="getSubject()"><!-- --></A><H3>
getSubject</H3>
<PRE>
public <A HREF="../../../javax/security/auth/Subject.html">Subject</A> <B>getSubject</B>()</PRE>
<DL>
<DD>Get the <code>Subject</code> associated with this
<code>SubjectDomainCombiner</code>.
<p><DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the <code>Subject</code> associated with this
<code>SubjectDomainCombiner</code>, or <code>null</code>
if no <code>Subject</code> is associated with this
<code>SubjectDomainCombiner</code>.<DT><B>Throws:</B><DD><CODE>java.lang.SecurityException</CODE> - if the caller does not have permission
to get the <code>Subject</code> associated with this
<code>SubjectDomainCombiner</code>.</DL>
</DD>
</DL>
<HR>
<A NAME="combine(java.security.ProtectionDomain[], java.security.ProtectionDomain[])"><!-- --></A><H3>
combine</H3>
<PRE>
public java.security.ProtectionDomain[] <B>combine</B>(java.security.ProtectionDomain[] currentDomains,
java.security.ProtectionDomain[] assignedDomains)</PRE>
<DL>
<DD>Update the provided ProtectionDomains with the relevant
Subject-based Permissions.
<p> For each <code>ProtectionDomain</code> in the
<i>currentDomains</i> array, this method retrieves the
Subject-based permissions granted in the <code>Policy</code>.
To retrieve these permissions, this method invokes the
<code>getPermissions</code> method from the <code>Policy</code>,
passing it the <code>Subject</code> associated with this
<code>SubjectDomainCombiner</code>, along with the
<code>CodeSource</code> associated with the respective
<code>ProtectionDomain</code>.
A new collection of Permissions is created from the union of the
retrieved Permissions and the original Permissions granted to that
<code>ProtectionDomain</code>. A new
<code>ProtectionDomain</code> is then instantiated
with this new collection of Permissions, as well as the
<code>CodeSource</code> from the original <code>ProtectionDomain</code>.
All of the newly instantiated ProtectionDomains are then
combined into a new array. The ProtectionDomains from the
<i>assignedDomains</i> array are appended to this new array,
and the result is returned.
<p> Note that optimizations such as the removal of duplicate entries
in the array, or the removal of duplicate Permissions in a
<code>ProtectionDomain</code> entry may have occurred.
Also note that if caching is permitted and the relevant
Permissions were already cached, this method does not need to consult
the <code>Policy</code> to retrieve the Subject-based permissions.
It simply accesses the cached permissions.
<p><DD><DL>
<DT><B>Specified by: </B><DD><CODE>combine</CODE> in interface <CODE>java.security.DomainCombiner</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>currentDomains</CODE> - the ProtectionDomains associated with the
current execution Thread, up to the most recent
privileged <code>ProtectionDomain</code>.
The ProtectionDomains are are listed in order of execution,
with the most recently executing <code>ProtectionDomain</code>
residing at the beginning of the array. This parameter may
be <code>null</code> if the current execution Thread
has no associated ProtectionDomains.<p><DD><CODE>assignedDomains</CODE> - the ProtectionDomains inherited from the
parent Thread, or the ProtectionDomains from the
privileged <i>context</i>, if a call to
AccessController.doPrivileged(..., <i>context</i>)
had occurred This parameter may be <code>null</code>
if there were no ProtectionDomains inherited from the
parent Thread, or from the privileged <i>context</i>.<DT><B>Returns:</B><DD>a new array consisting of the updated ProtectionDomains,
or <code>null</code>.</DL>
</DD>
</DL>
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