mirror of git://gcc.gnu.org/git/gcc.git
85 lines
2.8 KiB
Java
85 lines
2.8 KiB
Java
/* 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);
|
|
}
|
|
}
|