/*
 * Copyright 2009 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package sun.security.x509;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;

import sun.security.util.*;

/**
 * Represent the OCSP NoCheck Extension from RFC2560.
 * <p>
 * A CA may specify that an OCSP client can trust a responder for the
 * lifetime of the responder's certificate. The CA does so by including
 * the extension id-pkix-ocsp-nocheck. This SHOULD be a non-critical
 * extension. The value of the extension should be NULL. CAs issuing
 * such a certificate should realized that a compromise of the
 * responder's key, is as serious as the compromise of a CA key used to
 * sign CRLs, at least for the validity period of this certificate. CA's
 * may choose to issue this type of certificate with a very short
 * lifetime and renew it frequently.
 * <pre>
 * id-pkix-ocsp-nocheck OBJECT IDENTIFIER ::= { id-pkix-ocsp 5 }
 * </pre>
 *
 * @author Xuelei Fan
 * @see Extension
 * @see CertAttrSet
 */
public class OCSPNoCheckExtension extends Extension
    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.extensions.OCSPNoCheck";
    /**
     * Attribute names.
     */
    public static final String NAME = "OCSPNoCheck";

    /**
     * Create a OCSPNoCheckExtension
     */
    public OCSPNoCheckExtension() throws IOException {
        this.extensionId = PKIXExtensions.OCSPNoCheck_Id;
        this.critical = false;
        this.extensionValue = new byte[0];
    }

    /**
     * Create the extension from the passed DER encoded value.
     *
     * @param critical true if the extension is to be treated as critical.
     * @param value an array of DER encoded bytes of the actual value.
     * @exception IOException on error.
     */
    public OCSPNoCheckExtension(Boolean critical, Object value)
        throws IOException {

        this.extensionId = PKIXExtensions.OCSPNoCheck_Id;
        this.critical = critical.booleanValue();

        // the value should be null, just ignore it here.
        this.extensionValue = new byte[0];
    }

    /**
     * Set the attribute value.
     */
    public void set(String name, Object obj) throws IOException {
        throw new IOException("No attribute is allowed by " +
                        "CertAttrSet:OCSPNoCheckExtension.");
    }

    /**
     * Get the attribute value.
     */
    public Object get(String name) throws IOException {
        throw new IOException("No attribute is allowed by " +
                        "CertAttrSet:OCSPNoCheckExtension.");
    }

    /**
     * Delete the attribute value.
     */
    public void delete(String name) throws IOException {
        throw new IOException("No attribute is allowed by " +
                        "CertAttrSet:OCSPNoCheckExtension.");
    }

    /**
     * Return an enumeration of names of attributes existing within this
     * attribute.
     */
    public Enumeration<String> getElements() {
        return (new AttributeNameEnumeration()).elements();
    }

    /**
     * Return the name of this attribute.
     */
    public String getName() {
        return NAME;
    }
}