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	/*
	* Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/


	package com.sun.jmx.snmp.IPAcl;



	import java.util.Vector;
	import java.util.Enumeration;
	import java.io.Serializable;
	import java.net.UnknownHostException;


	import java.security.Principal;
	import java.security.acl.Group;


	/**
	* This class is used to represent a subnet mask (a group of hosts
	* matching the same
	* IP mask).
	*
	*/

	class GroupImpl extends PrincipalImpl implements Group, Serializable {
	private static final long serialVersionUID = -7777387035032541168L;

	/**
	* Constructs an empty group.
	* @exception UnknownHostException Not implemented
	*/
	public GroupImpl () throws UnknownHostException {
	}

	/**
	* Constructs a group using the specified subnet mask.
	*
	* @param mask The subnet mask to use to build the group.
	* @exception UnknownHostException if the subnet mask cann't be built.
	*/
	public GroupImpl (String mask) throws UnknownHostException {
	super(mask);
	}

	/**
	* Adds the specified member to the group.
	*
	* @param p 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 p) {
	// we don't need to add members because the ip address is a
	// subnet mask
	return true;
	}

	public int hashCode() {
	return super.hashCode();
	}

	/**
	* Compares this group to the specified object. Returns true if the object
	* passed in matches the group represented.
	*
	* @param p the object to compare with.
	* @return true if the object passed in matches the subnet mask,
	* false otherwise.
	*/
	public boolean equals (Object p) {
	if (p instanceof PrincipalImpl \|\| p instanceof GroupImpl){
	if ((super.hashCode() & p.hashCode()) == p.hashCode()) return true;
	else return false;
	} else {
	return false;
	}
	}

	/**
	* Returns true if the passed principal is a member of the group.
	*
	* @param p 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 p) {
	if ((p.hashCode() & super.hashCode()) == p.hashCode()) return true;
	else return false;
	}

	/**
	* Returns an enumeration which contains the subnet mask.
	*
	* @return an enumeration which contains the subnet mask.
	*/
	public Enumeration<? extends Principal> members(){
	Vector<Principal> v = new Vector<Principal>(1);
	v.addElement(this);
	return v.elements();
	}

	/**
	* Removes the specified member from the group. (Not implemented)
	*
	* @param p the principal to remove from this group.
	* @return allways return true.
	*/
	public boolean removeMember(Principal p) {
	return true;
	}

	/**
	* Prints a string representation of this group.
	*
	* @return a string representation of this group.
	*/
	public String toString() {
	return ("GroupImpl :"+super.getAddress().toString());
	}
	}

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