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Diffstat (limited to 'libjava/java/security/GuardedObject.java')
-rw-r--r-- | libjava/java/security/GuardedObject.java | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/libjava/java/security/GuardedObject.java b/libjava/java/security/GuardedObject.java new file mode 100644 index 0000000..4e46896 --- /dev/null +++ b/libjava/java/security/GuardedObject.java @@ -0,0 +1,84 @@ +/* GuardedObject.java -- An object protected by a Guard + Copyright (C) 1998 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA +02111-1307 USA. + +As a special exception, if you link this library with other files to +produce an executable, this library does not by itself cause the +resulting executable to be covered by the GNU General Public License. +This exception does not however invalidate any other reasons why the +executable file might be covered by the GNU General Public License. */ + +package java.security; + +import java.io.Serializable; + +/** + * This class is an object that is guarded by a <code>Guard</code> object. + * The object that is being guarded is retrieved by a call to the only + * method in this class - <code>getObject</code>. That method returns the + * guarded <code>Object</code> after first checking with the + * <code>Guard</code>. If the <code>Guard</code> disallows access, an + * exception will be thrown. + * + * @version 0.0 + * + * @author Aaron M. Renn (arenn@urbanophile.com) + */ +public class GuardedObject implements Serializable +{ + /** + * This is the Guard that is protecting the object. + */ + private Guard guard; + + /** + * This is the object that is being guarded. + */ + private Object object; + + /** + * This method initializes a new instance of <code>GuardedObject</code> + * that protects the specified <code>Object</code> using the specified + * <code>Guard</code> + * + * @param object The <code>Object</code> to guard + * @param guard The <code>Guard</code> that is protecting the object. + */ + public GuardedObject(Object object, Guard guard) + { + this.object = object; + this.guard = guard; + } + + /** + * This method first call the <code>checkGuard</code> method on the + * <code>Guard</code> object protecting the guarded object. If the + * <code>Guard</code> disallows access, an exception is thrown, otherwise + * the <code>Object</code> is returned. + * + * @return The object being guarded + * + * @exception SecurityException If the <code>Guard</code> disallows access to the object. + */ + public Object getObject() throws SecurityException + { + guard.checkGuard(object); + return (object); + } +} |