/*

 * Copyright (c) 2006, 2013, 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

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 */

package com.sun.security.auth;

import java.security.Principal;

import javax.naming.InvalidNameException;

import javax.naming.ldap.LdapName;

/**

 * A principal identified by a distinguished name as specified by

 * <a href="http://www.ietf.org/rfc/rfc2253.txt">RFC 2253</a>.

 *

 * <p>

 * After successful authentication, a user {@link java.security.Principal}

 * can be associated with a particular {@link javax.security.auth.Subject}

 * to augment that <code>Subject</code> with an additional identity.

 * Authorization decisions can then be based upon the

 * <code>Principal</code>s that are associated with a <code>Subject</code>.

 *

 * <p>

 * This class is immutable.

 *

 * @since 1.6

 */

public final class LdapPrincipal implements Principal, java.io.Serializable {

    private static final long serialVersionUID = 6820120005580754861L;

    /**

     * The principal's string name

     *

     * @serial

     */

    private final String nameString;

    /**

     * The principal's name

     *

     * @serial

     */

    private final LdapName name;

    /**

     * Creates an LDAP principal.

     *

     * @param name The principal's string distinguished name.

     * @throws InvalidNameException If a syntax violation is detected.

     * @exception NullPointerException If the <code>name</code> is

     * <code>null</code>.

     */

    public LdapPrincipal(String name) throws InvalidNameException {

        if (name == null) {

            throw new NullPointerException("null name is illegal");

        }

        this.name = getLdapName(name);

        nameString = name;

    }

    /**

     * Compares this principal to the specified object.

     *

     * @param object The object to compare this principal against.

     * @return true if they are equal; false otherwise.

     */

    public boolean equals(Object object) {

        if (this == object) {

            return true;

        }

        if (object instanceof LdapPrincipal) {

            try {

                return

                    name.equals(getLdapName(((LdapPrincipal)object).getName()));

            } catch (InvalidNameException e) {

                return false;

            }

        }

        return false;

    }

    /**

     * Computes the hash code for this principal.

     *

     * @return The principal's hash code.

     */

    public int hashCode() {

        return name.hashCode();

    }

    /**

     * Returns the name originally used to create this principal.

     *

     * @return The principal's string name.

     */

    public String getName() {

        return nameString;

    }

    /**

     * Creates a string representation of this principal's name in the format

     * defined by <a href="http://www.ietf.org/rfc/rfc2253.txt">RFC 2253</a>.

     * If the name has zero components an empty string is returned.

     *

     * @return The principal's string name.

     */

    public String toString() {

        return name.toString();

    }

    // Create an LdapName object from a string distinguished name.

    private LdapName getLdapName(String name) throws InvalidNameException {

        return new LdapName(name);

    }

}