/*

 * Copyright (c) 1997, 2004, 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 sun.security.x509;

import java.io.IOException;

import sun.security.util.*;

/**

 * This class implements the ASN.1 GeneralName object class.

 * <p>

 * The ASN.1 syntax for this is:

 * <pre>

 * GeneralName ::= CHOICE {

 *    otherName                       [0]     OtherName,

 *    rfc822Name                      [1]     IA5String,

 *    dNSName                         [2]     IA5String,

 *    x400Address                     [3]     ORAddress,

 *    directoryName                   [4]     Name,

 *    ediPartyName                    [5]     EDIPartyName,

 *    uniformResourceIdentifier       [6]     IA5String,

 *    iPAddress                       [7]     OCTET STRING,

 *    registeredID                    [8]     OBJECT IDENTIFIER

 * }

 * </pre>

 * @author Amit Kapoor

 * @author Hemma Prafullchandra

 */

public class GeneralName {

    // Private data members

    private GeneralNameInterface name = null;

    /**

     * Default constructor for the class.

     *

     * @param name the selected CHOICE from the list.

     * @throws NullPointerException if name is null

     */

    public GeneralName(GeneralNameInterface name) {

        if (name == null) {

            throw new NullPointerException("GeneralName must not be null");

        }

        this.name = name;

    }

    /**

     * Create the object from its DER encoded value.

     *

     * @param encName the DER encoded GeneralName.

     */

    public GeneralName(DerValue encName) throws IOException {

        this(encName, false);

    }

    /**

     * Create the object from its DER encoded value.

     *

     * @param encName the DER encoded GeneralName.

     * @param nameConstraint true if general name is a name constraint

     */

    public GeneralName(DerValue encName, boolean nameConstraint)

        throws IOException {

        short tag = (byte)(encName.tag & 0x1f);

        // All names except for NAME_DIRECTORY should be encoded with the

        // IMPLICIT tag.

        switch (tag) {

        case GeneralNameInterface.NAME_ANY:

            if (encName.isContextSpecific() && encName.isConstructed()) {

                encName.resetTag(DerValue.tag_Sequence);

                name = new OtherName(encName);

            } else {

                throw new IOException("Invalid encoding of Other-Name");

            }

            break;

        case GeneralNameInterface.NAME_RFC822:

            if (encName.isContextSpecific() && !encName.isConstructed()) {

                encName.resetTag(DerValue.tag_IA5String);

                name = new RFC822Name(encName);

            } else {

                throw new IOException("Invalid encoding of RFC822 name");

            }

            break;

        case GeneralNameInterface.NAME_DNS:

            if (encName.isContextSpecific() && !encName.isConstructed()) {

                encName.resetTag(DerValue.tag_IA5String);

                name = new DNSName(encName);

            } else {

                throw new IOException("Invalid encoding of DNS name");

            }

            break;

        case GeneralNameInterface.NAME_URI:

            if (encName.isContextSpecific() && !encName.isConstructed()) {

                encName.resetTag(DerValue.tag_IA5String);

                name = (nameConstraint ? URIName.nameConstraint(encName) :

                        new URIName(encName));

            } else {

                throw new IOException("Invalid encoding of URI");

            }

            break;

        case GeneralNameInterface.NAME_IP:

            if (encName.isContextSpecific() && !encName.isConstructed()) {

                encName.resetTag(DerValue.tag_OctetString);

                name = new IPAddressName(encName);

            } else {

                throw new IOException("Invalid encoding of IP address");

            }

            break;

        case GeneralNameInterface.NAME_OID:

            if (encName.isContextSpecific() && !encName.isConstructed()) {

                encName.resetTag(DerValue.tag_ObjectId);

                name = new OIDName(encName);

            } else {

                throw new IOException("Invalid encoding of OID name");

            }

            break;

        case GeneralNameInterface.NAME_DIRECTORY:

            if (encName.isContextSpecific() && encName.isConstructed()) {

                name = new X500Name(encName.getData());

            } else {

                throw new IOException("Invalid encoding of Directory name");

            }

            break;

        case GeneralNameInterface.NAME_EDI:

            if (encName.isContextSpecific() && encName.isConstructed()) {

                encName.resetTag(DerValue.tag_Sequence);

                name = new EDIPartyName(encName);

            } else {

                throw new IOException("Invalid encoding of EDI name");

            }

            break;

        default:

            throw new IOException("Unrecognized GeneralName tag, ("

                                  + tag +")");

        }

    }

    /**

     * Return the type of the general name.

     */

    public int getType() {

        return name.getType();

    }

    /**

     * Return the GeneralNameInterface name.

     */

    public GeneralNameInterface getName() {

        //XXXX May want to consider cloning this

        return name;

    }

    /**

     * Return the name as user readable string

     */

    public String toString() {

        return name.toString();

    }

    /**

     * Compare this GeneralName with another

     *

     * @param other GeneralName to compare to this

     * @returns true if match

     */

    public boolean equals(Object other) {

        if (this == other) {

            return true;

        }

        if (!(other instanceof GeneralName))

            return false;

        GeneralNameInterface otherGNI = ((GeneralName)other).name;

        try {

            return name.constrains(otherGNI) == GeneralNameInterface.NAME_MATCH;

        } catch (UnsupportedOperationException ioe) {

            return false;

        }

    }

    /**

     * Returns the hash code for this GeneralName.

     *

     * @return a hash code value.

     */

    public int hashCode() {

        return name.hashCode();

    }

    /**

     * Encode the name to the specified DerOutputStream.

     *

     * @exception IOException on encoding errors.

     */

    public void encode(DerOutputStream out) throws IOException {

        DerOutputStream tmp = new DerOutputStream();

        name.encode(tmp);

        int nameType = name.getType();

        if (nameType == GeneralNameInterface.NAME_ANY ||

            nameType == GeneralNameInterface.NAME_X400 ||

            nameType == GeneralNameInterface.NAME_EDI) {

            // implicit, constructed form

            out.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,

                              true, (byte)nameType), tmp);

        } else if (nameType == GeneralNameInterface.NAME_DIRECTORY) {

            // explicit, constructed form since underlying tag is CHOICE

            // (see X.680 section 30.6, part c)

            out.write(DerValue.createTag(DerValue.TAG_CONTEXT,

                                         true, (byte)nameType), tmp);

        } else {

            // implicit, primitive form

            out.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,

                              false, (byte)nameType), tmp);

        }

    }

}