/* * Copyright (c) 1997, 2003, 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 java.io.OutputStream;import java.security.cert.CertificateException;import java.util.Enumeration; /** * This interface defines the methods required of a certificate attribute. * Examples of X.509 certificate attributes are Validity, Issuer_Name, and * Subject Name. A CertAttrSet may comprise one attribute or many * attributes. * <p> * A CertAttrSet itself can also be comprised of other sub-sets. * In the case of X.509 V3 certificates, for example, the "extensions" * attribute has subattributes, such as those for KeyUsage and * AuthorityKeyIdentifier. * * @author Amit Kapoor * @author Hemma Prafullchandra * @see CertificateException */public interface CertAttrSet<T> {    /**     * Returns a short string describing this certificate attribute.     *     * @return value of this certificate attribute in     *         printable form.     */    String toString();     /**     * Encodes the attribute to the output stream in a format     * that can be parsed by the <code>decode</code> method.     *     * @param out the OutputStream to encode the attribute to.     *     * @exception CertificateException on encoding or validity errors.     * @exception IOException on other errors.     */    void encode(OutputStream out)        throws CertificateException, IOException;     /**     * Sets an attribute value within this CertAttrSet.     *     * @param name the name of the attribute (e.g. "x509.info.key")     * @param obj the attribute object.     *     * @exception CertificateException on attribute handling errors.     * @exception IOException on other errors.     */    void set(String name, Object obj)        throws CertificateException, IOException;     /**     * Gets an attribute value for this CertAttrSet.     *     * @param name the name of the attribute to return.     *     * @exception CertificateException on attribute handling errors.     * @exception IOException on other errors.     */    Object get(String name)        throws CertificateException, IOException;     /**     * Deletes an attribute value from this CertAttrSet.     *     * @param name the name of the attribute to delete.     *     * @exception CertificateException on attribute handling errors.     * @exception IOException on other errors.     */    void delete(String name)        throws CertificateException, IOException;     /**     * Returns an enumeration of the names of the attributes existing within     * this attribute.     *     * @return an enumeration of the attribute names.     */    Enumeration<T> getElements();     /**     * Returns the name (identifier) of this CertAttrSet.     *     * @return the name of this CertAttrSet.     */    String getName();}