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Java example source code file (PolicyMappingsExtension.java)

This example Java source code file (PolicyMappingsExtension.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, attribute, attributenameenumeration, certattrset\:policymappingsextension, certificatepolicymap, checked, deroutputstream, dervalue, invalid, ioexception, list, object, policymappingsextension, string, util

The PolicyMappingsExtension.java Java example source code

/*
 * Copyright (c) 1997, 2011, 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.util.*;

import sun.security.util.*;

/**
 * Represent the Policy Mappings Extension.
 *
 * This extension, if present, identifies the certificate policies considered
 * identical between the issuing and the subject CA.
 * <p>Extensions are addiitonal attributes which can be inserted in a X509
 * v3 certificate. For example a "Driving License Certificate" could have
 * the driving license number as a extension.
 *
 * <p>Extensions are represented as a sequence of the extension identifier
 * (Object Identifier), a boolean flag stating whether the extension is to
 * be treated as being critical and the extension value itself (this is again
 * a DER encoding of the extension value).
 *
 * @author Amit Kapoor
 * @author Hemma Prafullchandra
 * @see Extension
 * @see CertAttrSet
 */
public class PolicyMappingsExtension 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.PolicyMappings";
    /**
     * Attribute names.
     */
    public static final String NAME = "PolicyMappings";
    public static final String MAP = "map";

    // Private data members
    private List<CertificatePolicyMap> maps;

    // Encode this extension value
    private void encodeThis() throws IOException {
        if (maps == null || maps.isEmpty()) {
            this.extensionValue = null;
            return;
        }
        DerOutputStream os = new DerOutputStream();
        DerOutputStream tmp = new DerOutputStream();

        for (CertificatePolicyMap map : maps) {
            map.encode(tmp);
        }

        os.write(DerValue.tag_Sequence, tmp);
        this.extensionValue = os.toByteArray();
    }

    /**
     * Create a PolicyMappings with the List of CertificatePolicyMap.
     *
     * @param maps the List of CertificatePolicyMap.
     */
    public PolicyMappingsExtension(List<CertificatePolicyMap> map)
            throws IOException {
        this.maps = map;
        this.extensionId = PKIXExtensions.PolicyMappings_Id;
        this.critical = false;
        encodeThis();
    }

    /**
     * Create a default PolicyMappingsExtension.
     */
    public PolicyMappingsExtension() {
        extensionId = PKIXExtensions.KeyUsage_Id;
        critical = false;
        maps = new ArrayList<CertificatePolicyMap>();
    }

    /**
     * Create the extension from the passed DER encoded value.
     *
     * @params critical true if the extension is to be treated as critical.
     * @params value an array of DER encoded bytes of the actual value.
     * @exception ClassCastException if value is not an array of bytes
     * @exception IOException on error.
     */
    public PolicyMappingsExtension(Boolean critical, Object value)
    throws IOException {
        this.extensionId = PKIXExtensions.PolicyMappings_Id;
        this.critical = critical.booleanValue();

        this.extensionValue = (byte[]) value;
        DerValue val = new DerValue(this.extensionValue);
        if (val.tag != DerValue.tag_Sequence) {
            throw new IOException("Invalid encoding for " +
                                  "PolicyMappingsExtension.");
        }
        maps = new ArrayList<CertificatePolicyMap>();
        while (val.data.available() != 0) {
            DerValue seq = val.data.getDerValue();
            CertificatePolicyMap map = new CertificatePolicyMap(seq);
            maps.add(map);
        }
    }

    /**
     * Returns a printable representation of the policy map.
     */
    public String toString() {
        if (maps == null) return "";
        String s = super.toString() + "PolicyMappings [\n"
                 + maps.toString() + "]\n";

        return (s);
    }

    /**
     * Write the extension to the OutputStream.
     *
     * @param out the OutputStream to write the extension to.
     * @exception IOException on encoding errors.
     */
    public void encode(OutputStream out) throws IOException {
        DerOutputStream tmp = new DerOutputStream();
        if (extensionValue == null) {
            extensionId = PKIXExtensions.PolicyMappings_Id;
            critical = false;
            encodeThis();
        }
        super.encode(tmp);
        out.write(tmp.toByteArray());
    }

    /**
     * Set the attribute value.
     */
    @SuppressWarnings("unchecked") // Checked with instanceof
    public void set(String name, Object obj) throws IOException {
        if (name.equalsIgnoreCase(MAP)) {
            if (!(obj instanceof List)) {
              throw new IOException("Attribute value should be of" +
                                    " type List.");
            }
            maps = (List<CertificatePolicyMap>)obj;
        } else {
          throw new IOException("Attribute name not recognized by " +
                        "CertAttrSet:PolicyMappingsExtension.");
        }
        encodeThis();
    }

    /**
     * Get the attribute value.
     */
    public List<CertificatePolicyMap> get(String name) throws IOException {
        if (name.equalsIgnoreCase(MAP)) {
            return (maps);
        } else {
          throw new IOException("Attribute name not recognized by " +
                        "CertAttrSet:PolicyMappingsExtension.");
        }
    }

    /**
     * Delete the attribute value.
     */
    public void delete(String name) throws IOException {
        if (name.equalsIgnoreCase(MAP)) {
            maps = null;
        } else {
          throw new IOException("Attribute name not recognized by " +
                        "CertAttrSet:PolicyMappingsExtension.");
        }
        encodeThis();
    }

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

        return elements.elements();
    }

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

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