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 * Copyright (c) 1999, 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 sun.security.x509.X500Name;
import static sun.security.util.ResourcesMgr.getAuthResourceString;

/**
 * This class represents an X.500 {@code Principal}.
 * X500Principals have names such as,
 * "CN=Duke, OU=JavaSoft, O=Sun Microsystems, C=US"
 * (RFC 1779 style).
 *
 * <p> Principals such as this {@code X500Principal}
 * may be associated with a particular {@code Subject}
 * to augment that {@code Subject} with an additional
 * identity.  Refer to the {@code Subject} class for more information
 * on how to achieve this.  Authorization decisions can then be based upon
 * the Principals associated with a {@code Subject}.
 *
 * @see java.security.Principal
 * @see javax.security.auth.Subject
 * @deprecated A new X500Principal class is available in the Java platform.
 *             This X500Principal classs is entirely deprecated and
 *             is here to allow for a smooth transition to the new
 *             class.
 * This class is subject to removal in a future version of Java SE.
 * @see javax.security.auth.x500.X500Principal
*/
@Deprecated(since="1.4", forRemoval=true)
public class X500Principal implements Principal, java.io.Serializable {

    private static final long serialVersionUID = -8222422609431628648L;

    /**
     * @serial
     */
    private String name;

    transient private X500Name thisX500Name;

    /**
     * Create a X500Principal with an X.500 Name,
     * such as "CN=Duke, OU=JavaSoft, O=Sun Microsystems, C=US"
     * (RFC 1779 style).
     *
     * @param name the X.500 name
     *
     * @exception NullPointerException if the {@code name}
     *                  is {@code null}.
     *
     * @exception IllegalArgumentException if the {@code name}
     *                  is improperly specified.
     */
    public X500Principal(String name) {
        if (name == null)
            throw new NullPointerException(getAuthResourceString("provided.null.name"));

        try {
            thisX500Name = new X500Name(name);
        } catch (Exception e) {
            throw new IllegalArgumentException(e.toString());
        }

        this.name = name;
    }

    /**
     * Return the Unix username for this {@code X500Principal}.
     *
     * @return the Unix username for this {@code X500Principal}
     */
    public String getName() {
        return thisX500Name.getName();
    }

    /**
     * Return a string representation of this {@code X500Principal}.
     *
     * @return a string representation of this {@code X500Principal}.
     */
    public String toString() {
        return thisX500Name.toString();
    }

    /**
     * Compares the specified Object with this {@code X500Principal}
     * for equality.
     *
     * @param o Object to be compared for equality with this
     *          {@code X500Principal}.
     *
     * @return true if the specified Object is equal to this
     *          {@code X500Principal}.
     */
    public boolean equals(Object o) {
        if (o == null)
            return false;

        if (this == o)
            return true;

        if (o instanceof X500Principal) {
            X500Principal that = (X500Principal)o;
            try {
                X500Name thatX500Name = new X500Name(that.getName());
                return thisX500Name.equals(thatX500Name);
            } catch (Exception e) {
                // any parsing exceptions, return false
                return false;
            }
        } else if (o instanceof Principal) {
            // this will return 'true' if 'o' is a sun.security.x509.X500Name
            // and the X500Names are equal
            return o.equals(thisX500Name);
        }

        return false;
    }

    /**
     * Return a hash code for this {@code X500Principal}.
     *
     * @return a hash code for this {@code X500Principal}.
     */
    public int hashCode() {
        return thisX500Name.hashCode();
    }

    /**
     * Reads this object from a stream (i.e., deserializes it)
     */
    private void readObject(java.io.ObjectInputStream s) throws
                                        java.io.IOException,
                                        java.io.NotActiveException,
                                        ClassNotFoundException {

        s.defaultReadObject();

        // re-create thisX500Name
        thisX500Name = new X500Name(name);
    }
}