/*

 * 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

 * particular file as subject to the "Classpath" exception as provided

 *

 * 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.

 *

 */

package sun.security.x509;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.Enumeration;

import javax.security.auth.x500.X500Principal;

import sun.security.util.*;

/**

 * This class defines the X500Name attribute for the Certificate.

 *

 * @author Amit Kapoor

 * @author Hemma Prafullchandra

 * @see CertAttrSet

 */

public class CertificateIssuerName implements CertAttrSet<String> {

    /**

     * Identifier for this attribute, to be used with the

     * get, set, delete methods of Certificate, x509 type.

     */

    public static final String IDENT = "x509.info.issuer";

    /**

     * Sub attributes name for this CertAttrSet.

     */

    public static final String NAME = "issuer";

    public static final String DN_NAME = "dname";

    // accessor name for cached X500Principal only

    // do not allow a set() of this value, do not advertise with getElements()

    public static final String DN_PRINCIPAL = "x500principal";

    // Private data member

    private X500Name    dnName;

    // cached X500Principal version of the name

    private X500Principal dnPrincipal;

    /**

     * Default constructor for the certificate attribute.

     *

     * @param name the X500Name

     */

    public CertificateIssuerName(X500Name name) {

        this.dnName = name;

    }

    /**

     * Create the object, decoding the values from the passed DER stream.

     *

     * @param in the DerInputStream to read the X500Name from.

     * @exception IOException on decoding errors.

     */

    public CertificateIssuerName(DerInputStream in) throws IOException {

        dnName = new X500Name(in);

    }

    /**

     * Create the object, decoding the values from the passed stream.

     *

     * @param in the InputStream to read the X500Name from.

     * @exception IOException on decoding errors.

     */

    public CertificateIssuerName(InputStream in) throws IOException {

        DerValue derVal = new DerValue(in);

        dnName = new X500Name(derVal);

    }

    /**

     * Return the name as user readable string.

     */

    public String toString() {

        if (dnName == null) return "";

        return(dnName.toString());

    }

    /**

     * Encode the name in DER form to the stream.

     *

     * @param out the DerOutputStream to marshal the contents to.

     * @exception IOException on errors.

     */

    public void encode(OutputStream out) throws IOException {

        DerOutputStream tmp = new DerOutputStream();

        dnName.encode(tmp);

        out.write(tmp.toByteArray());

    }

    /**

     * Set the attribute value.

     */

    public void set(String name, Object obj) throws IOException {

        if (!(obj instanceof X500Name)) {

            throw new IOException("Attribute must be of type X500Name.");

        }

        if (name.equalsIgnoreCase(DN_NAME)) {

            this.dnName = (X500Name)obj;

            this.dnPrincipal = null;

        } else {

            throw new IOException("Attribute name not recognized by " +

                                  "CertAttrSet:CertificateIssuerName.");

        }

    }

    /**

     * Get the attribute value.

     */

    public Object get(String name) throws IOException {

        if (name.equalsIgnoreCase(DN_NAME)) {

            return(dnName);

        } else if (name.equalsIgnoreCase(DN_PRINCIPAL)) {

            if ((dnPrincipal == null) && (dnName != null)) {

                dnPrincipal = dnName.asX500Principal();

            }

            return dnPrincipal;

        } else {

            throw new IOException("Attribute name not recognized by " +

                                  "CertAttrSet:CertificateIssuerName.");

        }

    }

    /**

     * Delete the attribute value.

     */

    public void delete(String name) throws IOException {

        if (name.equalsIgnoreCase(DN_NAME)) {

            dnName = null;

            dnPrincipal = null;

        } else {

            throw new IOException("Attribute name not recognized by " +

                                  "CertAttrSet:CertificateIssuerName.");

        }

    }

    /**

     * Return an enumeration of names of attributes existing within this

     * attribute.

     */

    public Enumeration<String> getElements() {

        AttributeNameEnumeration elements = new AttributeNameEnumeration();

        elements.addElement(DN_NAME);

        return (elements.elements());

    }

    /**

     * Return the name of this attribute.

     */

    public String getName() {

        return(NAME);

    }

}