/**************************************************************************
* Copyright (c) 2001 by Punch Telematix. All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* 1. Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* 2. Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* 3. Neither the name of Punch Telematix nor the names of *
* other contributors may be used to endorse or promote products *
* derived from this software without specific prior written permission.*
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. *
* IN NO EVENT SHALL PUNCH TELEMATIX OR OTHER CONTRIBUTORS BE LIABLE *
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF *
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR *
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
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**************************************************************************/
package wonka.security;
import java.security.Permission;
import java.security.PermissionCollection;
import wonka.security.DefaultPermissionCollection;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
/**
* The class Permissions represents a collection of PermissionCollection's
* (a super-collection). One PermissionObject is present for each subclass
* of java.security.Permission which has at least one instance in the
* super-collection.
*/
final class PolicyPermissionCollection extends PermissionCollection implements Cloneable {
private Hashtable collections;
private boolean allPermissions=false;
private static final int INITIAL_TABSIZE=11;
/**
** Constructor Permissions() builds an empty Hashtable.
*/
PolicyPermissionCollection() {
collections = new Hashtable(INITIAL_TABSIZE);
}
/**
* Method add(Permission) adds the specified Permission to the
* collection appropriate to the class of the Permission. If no
* collection yet exists for this class then one is created.
*/
public synchronized void add (Permission permission) throws SecurityException {
if (super.isReadOnly()) throw new SecurityException("read-only");
Class pc = permission.getClass();
PermissionCollection c = (PermissionCollection)collections.get(pc);
if (c == null) {
c = permission.newPermissionCollection();
if (c == null) {
c = new DefaultPermissionCollection();
}
collections.put(pc,c);
if (pc.getName().equals("java.security.AllPermission")) {
allPermissions=true;
}
}
c.add(permission);
}
/**
* Method 'implies' tests whether a given permission is implied by any
* of the Permissions in this collection. We first identify the
* PermissionCollection appropriate to this subclass of Permission,
* and delegate to that.
*/
public boolean implies (Permission permission) {
Class pc = permission.getClass();
PermissionCollection c = (PermissionCollection)collections.get(pc);
if (c == null || allPermissions) {
return allPermissions;
}
return c.implies(permission);
}
/**
*/
public Enumeration elements() {
Vector v = new Vector();
Enumeration cols = collections.elements();
Enumeration pers;
while (cols.hasMoreElements()) {
pers = ((PermissionCollection)cols.nextElement()).elements();
while (pers.hasMoreElements()) {
v.add(pers.nextElement());
}
}
return v.elements();
}
protected Object clone(){
try {
PolicyPermissionCollection ppc = (PolicyPermissionCollection) super.clone();
ppc.collections = (Hashtable) collections.clone();
return ppc;
}
catch(CloneNotSupportedException cnse){
return null;
}
}
}