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