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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.security.acl.Permission;
	import java.util.Vector;
	import java.util.Enumeration;
	import java.io.Serializable;
	import java.net.UnknownHostException;

	import java.security.Principal;
	import java.security.acl.AclEntry;


	/**
	* Represent one entry in the Access Control List (ACL).
	* This ACL entry object contains a permission associated with a particular principal.
	* (A principal represents an entity such as an individual machine or a group).
	*
	* @see java.security.acl.AclEntry
	*/

	class AclEntryImpl implements AclEntry, Serializable {
	private static final long serialVersionUID = -5047185131260073216L;

	private AclEntryImpl (AclEntryImpl i) throws UnknownHostException {
	setPrincipal(i.getPrincipal());
	permList = new Vector<Permission>();
	commList = new Vector<String>();

	for (Enumeration<String> en = i.communities(); en.hasMoreElements();){
	addCommunity(en.nextElement());
	}

	for (Enumeration<Permission> en = i.permissions(); en.hasMoreElements();){
	addPermission(en.nextElement());
	}
	if (i.isNegative()) setNegativePermissions();
	}

	/**
	* Contructs an empty ACL entry.
	*/
	public AclEntryImpl (){
	princ = null;
	permList = new Vector<Permission>();
	commList = new Vector<String>();
	}

	/**
	* Constructs an ACL entry with a specified principal.
	*
	* @param p the principal to be set for this entry.
	*/
	public AclEntryImpl (Principal p) throws UnknownHostException {
	princ = p;
	permList = new Vector<Permission>();
	commList = new Vector<String>();
	}

	/**
	* Clones this ACL entry.
	*
	* @return a clone of this ACL entry.
	*/
	public Object clone() {
	AclEntryImpl i;
	try {
	i = new AclEntryImpl(this);
	}catch (UnknownHostException e) {
	i = null;
	}
	return (Object) i;
	}

	/**
	* Returns true if this is a negative ACL entry (one denying the associated principal
	* the set of permissions in the entry), false otherwise.
	*
	* @return true if this is a negative ACL entry, false if it's not.
	*/
	public boolean isNegative(){
	return neg;
	}

	/**
	* Adds the specified permission to this ACL entry. Note: An entry can
	* have multiple permissions.
	*
	* @param perm the permission to be associated with the principal in this
	* entry
	* @return true if the permission is removed, false if the permission was
	* not part of this entry's permission set.
	*
	*/
	public boolean addPermission(java.security.acl.Permission perm){
	if (permList.contains(perm)) return false;
	permList.addElement(perm);
	return true;
	}

	/**
	* Removes the specified permission from this ACL entry.
	*
	* @param perm the permission to be removed from this entry.
	* @return true if the permission is removed, false if the permission
	* was not part of this entry's permission set.
	*/
	public boolean removePermission(java.security.acl.Permission perm){
	if (!permList.contains(perm)) return false;
	permList.removeElement(perm);
	return true;
	}

	/**
	* Checks if the specified permission is part of the permission set in
	* this entry.
	*
	* @param perm the permission to be checked for.
	* @return true if the permission is part of the permission set in this
	* entry, false otherwise.
	*/

	public boolean checkPermission(java.security.acl.Permission perm){
	return (permList.contains(perm));
	}

	/**
	* Returns an enumeration of the permissions in this ACL entry.
	*
	* @return an enumeration of the permissions in this ACL entry.
	*/
	public Enumeration<Permission> permissions(){
	return permList.elements();
	}

	/**
	* Sets this ACL entry to be a negative one. That is, the associated principal
	* (e.g., a user or a group) will be denied the permission set specified in the
	* entry. Note: ACL entries are by default positive. An entry becomes a negative
	* entry only if this setNegativePermissions method is called on it.
	*
	* Not Implemented.
	*/
	public void setNegativePermissions(){
	neg = true;
	}

	/**
	* Returns the principal for which permissions are granted or denied by this ACL
	* entry. Returns null if there is no principal set for this entry yet.
	*
	* @return the principal associated with this entry.
	*/
	public Principal getPrincipal(){
	return princ;
	}

	/**
	* Specifies the principal for which permissions are granted or denied by
	* this ACL entry. If a principal was already set for this ACL entry,
	* false is returned, otherwise true is returned.
	*
	* @param p the principal to be set for this entry.
	* @return true if the principal is set, false if there was already a
	* principal set for this entry.
	*/
	public boolean setPrincipal(Principal p) {
	if (princ != null )
	return false;
	princ = p;
	return true;
	}

	/**
	* Returns a string representation of the contents of this ACL entry.
	*
	* @return a string representation of the contents.
	*/
	public String toString(){
	return "AclEntry:"+princ.toString();
	}

	/**
	* Returns an enumeration of the communities in this ACL entry.
	*
	* @return an enumeration of the communities in this ACL entry.
	*/
	public Enumeration<String> communities(){
	return commList.elements();
	}

	/**
	* Adds the specified community to this ACL entry. Note: An entry can
	* have multiple communities.
	*
	* @param comm the community to be associated with the principal
	* in this entry.
	* @return true if the community was added, false if the community was
	* already part of this entry's community set.
	*/
	public boolean addCommunity(String comm){
	if (commList.contains(comm)) return false;
	commList.addElement(comm);
	return true;
	}

	/**
	* Removes the specified community from this ACL entry.
	*
	* @param comm the community to be removed from this entry.
	* @return true if the community is removed, false if the community was
	* not part of this entry's community set.
	*/
	public boolean removeCommunity(String comm){
	if (!commList.contains(comm)) return false;
	commList.removeElement(comm);
	return true;
	}

	/**
	* Checks if the specified community is part of the community set in this
	* entry.
	*
	* @param comm the community to be checked for.
	* @return true if the community is part of the community set in this
	* entry, false otherwise.
	*/
	public boolean checkCommunity(String comm){
	return (commList.contains(comm));
	}

	private Principal princ = null;
	private boolean neg = false;
	private Vector<Permission> permList = null;
	private Vector<String> commList = null;
	}

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