/*

 * 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.net.InetAddress;

import java.net.UnknownHostException;

import java.io.Serializable;

/**

 * Principal represents a host.

 *

 */

class PrincipalImpl implements java.security.Principal, Serializable {

    private static final long serialVersionUID = -7910027842878976761L;

    private InetAddress[] add = null;

    /**

     * Constructs a principal with the local host.

     */

    public PrincipalImpl () throws UnknownHostException {

        add = new InetAddress[1];

        add[0] = java.net.InetAddress.getLocalHost();

    }

    /**

     * Construct a principal using the specified host.

     * <P>

     * The host can be either:

     * <UL>

     * <LI> a host name

     * <LI> an IP address

     * </UL>

     *

     * @param hostName the host used to make the principal.

     */

    public PrincipalImpl(String hostName) throws UnknownHostException {

        if ((hostName.equals("localhost")) || (hostName.equals("127.0.0.1"))) {

            add = new InetAddress[1];

            add[0] = java.net.InetAddress.getByName(hostName);

        }

        else

            add = java.net.InetAddress.getAllByName( hostName );

    }

    /**

     * Constructs a principal using an Internet Protocol (IP) address.

     *

     * @param address the Internet Protocol (IP) address.

     */

    public PrincipalImpl(InetAddress address) {

        add = new InetAddress[1];

        add[0] = address;

    }

    /**

     * Returns the name of this principal.

     *

     * @return the name of this principal.

     */

    public String getName() {

        return add[0].toString();

    }

    /**

     * Compares this principal to the specified object. Returns true if the

     * object passed in matches the principal

     * represented by the implementation of this interface.

     *

     * @param a the principal to compare with.

     * @return true if the principal passed in is the same as that encapsulated by this principal, false otherwise.

     */

    public boolean equals(Object a) {

        if (a instanceof PrincipalImpl){

            for(int i = 0; i < add.length; i++) {

                if(add[i].equals (((PrincipalImpl) a).getAddress()))

                    return true;

            }

            return false;

        } else {

            return false;

        }

    }

    /**

     * Returns a hashcode for this principal.

     *

     * @return a hashcode for this principal.

     */

    public int hashCode(){

        return add[0].hashCode();

    }

    /**

     * Returns a string representation of this principal. In case of multiple address, the first one is returned.

     *

     * @return a string representation of this principal.

     */

    public String toString() {

        return ("PrincipalImpl :"+add[0].toString());

    }

    /**

     * Returns the Internet Protocol (IP) address for this principal. In case of multiple address, the first one is returned.

     *

     * @return the Internet Protocol (IP) address for this principal.

     */

    public InetAddress getAddress(){

        return add[0];

    }

    /**

     * Returns the Internet Protocol (IP) address for this principal. In case of multiple address, the first one is returned.

     *

     * @return the array of Internet Protocol (IP) addresses for this principal.

     */

    public InetAddress[] getAddresses(){

        return add;

    }

}