/*

 * Copyright (c) 2000, 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;

/**

 * This class implements the {@code Principal} interface

 * and represents a user's Unix identification number (UID).

 *

 * <p> Principals such as this {@code UnixNumericUserPrincipal}

 * 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

 */

public class UnixNumericUserPrincipal implements

                                        Principal,

                                        java.io.Serializable {

    private static final long serialVersionUID = -4329764253802397821L;

    /**

     * @serial

     */

    private String name;

    /**

     * Create a {@code UnixNumericUserPrincipal} using a

     * {@code String} representation of the

     * user's identification number (UID).

     *

     * @param name the user identification number (UID) for this user.

     *

     * @exception NullPointerException if the {@code name}

     *                  is {@code null}.

     */

    public UnixNumericUserPrincipal(String name) {

        if (name == null) {

            java.text.MessageFormat form = new java.text.MessageFormat

                (sun.security.util.ResourcesMgr.getAuthResourceString

                        ("invalid.null.input.value"));

            Object[] source = {"name"};

            throw new NullPointerException(form.format(source));

        }

        this.name = name;

    }

    /**

     * Create a {@code UnixNumericUserPrincipal} using a

     * long representation of the user's identification number (UID).

     *

     * @param name the user identification number (UID) for this user

     *                  represented as a long.

     */

    public UnixNumericUserPrincipal(long name) {

        this.name = Long.toString(name);

    }

    /**

     * Return the user identification number (UID) for this

     * {@code UnixNumericUserPrincipal}.

     *

     * @return the user identification number (UID) for this

     *          {@code UnixNumericUserPrincipal}

     */

    public String getName() {

        return name;

    }

    /**

     * Return the user identification number (UID) for this

     * {@code UnixNumericUserPrincipal} as a long.

     *

     * @return the user identification number (UID) for this

     *          {@code UnixNumericUserPrincipal} as a long.

     */

    public long longValue() {

        return Long.parseLong(name);

    }

    /**

     * Return a string representation of this

     * {@code UnixNumericUserPrincipal}.

     *

     * @return a string representation of this

     *          {@code UnixNumericUserPrincipal}.

     */

    public String toString() {

        java.text.MessageFormat form = new java.text.MessageFormat

                (sun.security.util.ResourcesMgr.getAuthResourceString

                        ("UnixNumericUserPrincipal.name"));

        Object[] source = {name};

        return form.format(source);

    }

    /**

     * Compares the specified Object with this

     * {@code UnixNumericUserPrincipal}

     * for equality.  Returns true if the given object is also a

     * {@code UnixNumericUserPrincipal} and the two

     * UnixNumericUserPrincipals

     * have the same user identification number (UID).

     *

     * @param o Object to be compared for equality with this

     *          {@code UnixNumericUserPrincipal}.

     *

     * @return true if the specified Object is equal to this

     *          {@code UnixNumericUserPrincipal}.

     */

    public boolean equals(Object o) {

        if (o == null)

            return false;

        if (this == o)

            return true;

        if (!(o instanceof UnixNumericUserPrincipal))

            return false;

        UnixNumericUserPrincipal that = (UnixNumericUserPrincipal)o;

        if (this.getName().equals(that.getName()))

            return true;

        return false;

    }

    /**

     * Return a hash code for this {@code UnixNumericUserPrincipal}.

     *

     * @return a hash code for this {@code UnixNumericUserPrincipal}.

     */

    public int hashCode() {

        return name.hashCode();

    }

}