/**************************************************************************
* Copyright (c) 2001 by Punch Telematix. All rights reserved. *
* *
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* derived from this software without specific prior written permission.*
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *
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**************************************************************************/
package wonka.security;
import java.security.Permission;
import java.security.PermissionCollection;
import java.util.Enumeration;
import java.util.Hashtable;
/**
* The class DefaultPermissionCollection is a catch-all for all subclasses
* of Permission for which no special optimized collection is defined.
*/
public class DefaultPermissionCollection extends PermissionCollection {
private Hashtable hashtable;
private static final int INITIAL_TABSIZE=11;
/**
** Constructor DefaultPermissionCollection() builds an empty Hashtable.
*/
public DefaultPermissionCollection() {
hashtable = new Hashtable(INITIAL_TABSIZE);
}
/**
* Method add(Permission) adds the new permission to the hashtable.
*/
public synchronized void add (Permission permission) throws SecurityException {
if (super.isReadOnly()) throw new SecurityException("read-only");
hashtable.put(permission.getName(),permission);
// System.out.println("Hashtable after adding permission '"+permission+"': "+hashtable);
}
/**
* Method 'implies' tests whether a given permission is implied by any
* of the Permissions in this collection. Since we know nothing about
* the semantics of the Permissions, we iterate over the collection
* until we find a match (or fail).
*/
public synchronized boolean implies (Permission permission) {
Enumeration e = hashtable.elements();
while (e.hasMoreElements()) {
Permission p = (Permission)(e.nextElement());
if (p.implies(permission)) {
return true;
}
}
return false;
}
public Enumeration elements() {
return hashtable.elements();
}
}