/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.gatein.sso.saml.plugin;

import java.security.Principal;
import java.security.acl.Group;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;


/**
 * Forked class because this plugin can be used on both JBoss or Tomcat and we want to be independent on AS.
 *
 * An implementation of Group that manages a collection of Principal
 *objects based on their hashCode() and equals() methods. This class
 * is not thread safe.
 * @author Scott.Stark@jboss.org
 * @version $Revision$
 */
@SuppressWarnings({"rawtypes","unchecked"})
public class SimpleGroup extends SimplePrincipal implements Group, Cloneable
{
   /** The serialVersionUID */
   private static final long serialVersionUID = 605185963957807247L;

   private HashMap members;

   public SimpleGroup(String groupName)
   {
      super(groupName);
      members = new HashMap(3);
   }

   /** Adds the specified member to the group.
    @param user the principal to add to this group.
    @return true if the member was successfully added,
    false if the principal was already a member.
    */
   public boolean addMember(Principal user)
   {
      boolean isMember = members.containsKey(user);
      if( isMember == false )
         members.put(user, user);
      return isMember == false;
   }

   /** Returns true if the passed principal is a member of the group.
    This method does a recursive search, so if a principal belongs to a
    group which is a member of this group, true is returned.

    A special check is made to see if the member is an instance of
    org.jboss.security.AnybodyPrincipal or org.jboss.security.NobodyPrincipal
    since these classes do not hash to meaningful values.
    @param member the principal whose membership is to be checked.
    @return true if the principal is a member of this group,
    false otherwise.
    */
   public boolean isMember(Principal member)
   {
      // First see if there is a key with the member name
      boolean isMember = members.containsKey(member);

      if( isMember == false )
      {   // Check any Groups for membership
         Collection values = members.values();
         Iterator iter = values.iterator();
         while( isMember == false && iter.hasNext() )
         {
            Object next = iter.next();
            if( next instanceof Group )
            {
               Group group = (Group) next;
               isMember = group.isMember(member);
            }
         }
      }

      return isMember;
   }

   /** Returns an enumeration of the members in the group.
    The returned objects can be instances of either Principal
    or Group (which is a subinterface of Principal).
    @return an enumeration of the group members.
    */
   public Enumeration<Principal> members()
   {
      return Collections.enumeration(members.values());
   }

   /** Removes the specified member from the group.
    @param user the principal to remove from this group.
    @return true if the principal was removed, or
    false if the principal was not a member.
    */
   public boolean removeMember(Principal user)
   {
      Object prev = members.remove(user);
      return prev != null;
   }

   public String toString()
   {
      StringBuffer tmp = new StringBuffer(getName());
      tmp.append("(members:");
      Iterator iter = members.keySet().iterator();
      while( iter.hasNext() )
      {
         tmp.append(iter.next());
         tmp.append(',');
      }
      tmp.setCharAt(tmp.length()-1, ')');
      return tmp.toString();
   }

   public synchronized Object clone() throws CloneNotSupportedException
   {
      SimpleGroup clone = (SimpleGroup) super.clone();
      if(clone != null)
         clone.members = (HashMap)this.members.clone();
      return clone;
   }
}