/* * Copyright (c) 1997, 2006, 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.InputStream;import java.io.OutputStream;import java.util.Enumeration; import sun.security.util.*; /** * This class defines the AlgorithmId for the Certificate. * * @author Amit Kapoor * @author Hemma Prafullchandra */public class CertificateAlgorithmId implements CertAttrSet<String> {    private AlgorithmId algId;     /**     * Identifier for this attribute, to be used with the     * get, set, delete methods of Certificate, x509 type.     */    public static final String IDENT = "x509.info.algorithmID";    /**     * Sub attributes name for this CertAttrSet.     */    public static final String NAME = "algorithmID";     /**     * Identifier to be used with get, set, and delete methods. When     * using this identifier the associated object being passed in or     * returned is an instance of AlgorithmId.     * @see sun.security.x509.AlgorithmId     */    public static final String ALGORITHM = "algorithm";     /**     * Default constructor for the certificate attribute.     *     * @param algId the Algorithm identifier     */    public CertificateAlgorithmId(AlgorithmId algId) {        this.algId = algId;    }     /**     * Create the object, decoding the values from the passed DER stream.     *     * @param in the DerInputStream to read the serial number from.     * @exception IOException on decoding errors.     */    public CertificateAlgorithmId(DerInputStream in) throws IOException {        DerValue val = in.getDerValue();        algId = AlgorithmId.parse(val);    }     /**     * Create the object, decoding the values from the passed stream.     *     * @param in the InputStream to read the serial number from.     * @exception IOException on decoding errors.     */    public CertificateAlgorithmId(InputStream in) throws IOException {        DerValue val = new DerValue(in);        algId = AlgorithmId.parse(val);    }     /**     * Return the algorithm identifier as user readable string.     */    public String toString() {        if (algId == null) return "";        return (algId.toString() +                ", OID = " + (algId.getOID()).toString() + "\n");    }     /**     * Encode the algorithm identifier 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();        algId.encode(tmp);         out.write(tmp.toByteArray());    }     /**     * Set the attribute value.     */    public void set(String name, Object obj) throws IOException {        if (!(obj instanceof AlgorithmId)) {            throw new IOException("Attribute must be of type AlgorithmId.");        }        if (name.equalsIgnoreCase(ALGORITHM)) {            algId = (AlgorithmId)obj;        } else {            throw new IOException("Attribute name not recognized by " +                              "CertAttrSet:CertificateAlgorithmId.");        }    }     /**     * Get the attribute value.     */    public Object get(String name) throws IOException {        if (name.equalsIgnoreCase(ALGORITHM)) {            return (algId);        } else {            throw new IOException("Attribute name not recognized by " +                               "CertAttrSet:CertificateAlgorithmId.");        }    }     /**     * Delete the attribute value.     */    public void delete(String name) throws IOException {        if (name.equalsIgnoreCase(ALGORITHM)) {            algId = null;        } else {            throw new IOException("Attribute name not recognized by " +                               "CertAttrSet:CertificateAlgorithmId.");        }    }     /**     * Return an enumeration of names of attributes existing within this     * attribute.     */    public Enumeration<String> getElements() {        AttributeNameEnumeration elements = new AttributeNameEnumeration();        elements.addElement(ALGORITHM);        return (elements.elements());    }    /**    * Return the name of this attribute.    */   public String getName() {      return (NAME);   }}