Java example source code file (DistributionPointName.java)

This example Java source code file (DistributionPointName.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

deroutputstream, distributionpointname, distributionpointname\:\\n, generalnames, illegalargumentexception, invalid, ioexception, rdn, stringbuilder, tag_full_name, tag_relative_name, util

The DistributionPointName.java Java example source code

/*
 * Copyright (c) 2005, 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.util.*;

import sun.security.util.BitArray;
import sun.security.util.DerOutputStream;
import sun.security.util.DerValue;

/**
 * Represents the DistributionPointName ASN.1 type.
 *
 * It is used in the CRL Distribution Points Extension (OID = 2.5.29.31)
 * and the Issuing Distribution Point Extension (OID = 2.5.29.28).
 * <p>
 * Its ASN.1 definition is:
 * <pre>
 *
 *     DistributionPointName ::= CHOICE {
 *         fullName                  [0] GeneralNames,
 *         nameRelativeToCRLIssuer   [1] RelativeDistinguishedName }
 *
 *     GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
 *
 *     GeneralName ::= CHOICE {
 *         otherName                 [0] INSTANCE OF OTHER-NAME,
 *         rfc822Name                [1] IA5String,
 *         dNSName                   [2] IA5String,
 *         x400Address               [3] ORAddress,
 *         directoryName             [4] Name,
 *         ediPartyName              [5] EDIPartyName,
 *         uniformResourceIdentifier [6] IA5String,
 *         iPAddress                 [7] OCTET STRING,
 *         registeredID              [8] OBJECT IDENTIFIER }
 *
 *     RelativeDistinguishedName ::= SET OF AttributeTypeAndValue
 *
 *     AttributeTypeAndValue ::= SEQUENCE {
 *         type    AttributeType,
 *         value   AttributeValue }
 *
 *     AttributeType ::= OBJECT IDENTIFIER
 *
 *     AttributeValue ::= ANY DEFINED BY AttributeType
 *
 * </pre>
 * <p>
 * Instances of this class are designed to be immutable. However, since this
 * is an internal API we do not use defensive cloning for values for
 * performance reasons. It is the responsibility of the consumer to ensure
 * that no mutable elements are modified.
 *
 * @see CRLDistributionPointsExtension
 * @see IssuingDistributionPointExtension
 * @since 1.6
 */
public class DistributionPointName {

    // ASN.1 context specific tag values
    private static final byte TAG_FULL_NAME = 0;
    private static final byte TAG_RELATIVE_NAME = 1;

    // Only one of fullName and relativeName can be set
    private GeneralNames fullName = null;
    private RDN relativeName = null;

    // Cached hashCode value
    private volatile int hashCode;

    /**
     * Creates a distribution point name using a full name.
     *
     * @param fullName the name for the distribution point.
     * @exception IllegalArgumentException if <code>fullName is null.
     */
    public DistributionPointName(GeneralNames fullName) {

        if (fullName == null) {
            throw new IllegalArgumentException("fullName must not be null");
        }
        this.fullName = fullName;
    }

    /**
     * Creates a distribution point name using a relative name.
     *
     * @param relativeName the name of the distribution point relative to
     *        the name of the issuer of the CRL.
     * @exception IllegalArgumentException if <code>relativeName is null.
     */
    public DistributionPointName(RDN relativeName) {

        if (relativeName == null) {
            throw new IllegalArgumentException("relativeName must not be null");
        }
        this.relativeName = relativeName;
    }

    /**
     * Creates a distribution point name from its DER-encoded form.
     *
     * @param encoding the DER-encoded value.
     * @throws IOException on decoding error.
     */
    public DistributionPointName(DerValue encoding) throws IOException {

        if (encoding.isContextSpecific(TAG_FULL_NAME) &&
            encoding.isConstructed()) {

            encoding.resetTag(DerValue.tag_Sequence);
            fullName = new GeneralNames(encoding);

        } else if (encoding.isContextSpecific(TAG_RELATIVE_NAME) &&
            encoding.isConstructed()) {

            encoding.resetTag(DerValue.tag_Set);
            relativeName = new RDN(encoding);

        } else {
            throw new IOException("Invalid encoding for DistributionPointName");
        }

    }

    /**
     * Returns the full name for the distribution point or null if not set.
     */
    public GeneralNames getFullName() {
        return fullName;
    }

    /**
     * Returns the relative name for the distribution point or null if not set.
     */
    public RDN getRelativeName() {
        return relativeName;
    }

    /**
     * Encodes the distribution point name and writes it to the DerOutputStream.
     *
     * @param out the output stream.
     * @exception IOException on encoding error.
     */
    public void encode(DerOutputStream out) throws IOException {

        DerOutputStream theChoice = new DerOutputStream();

        if (fullName != null) {
            fullName.encode(theChoice);
            out.writeImplicit(
                DerValue.createTag(DerValue.TAG_CONTEXT, true, TAG_FULL_NAME),
                theChoice);

        } else {
            relativeName.encode(theChoice);
            out.writeImplicit(
                DerValue.createTag(DerValue.TAG_CONTEXT, true,
                    TAG_RELATIVE_NAME),
                theChoice);
        }
    }

    /**
     * Compare an object to this distribution point name for equality.
     *
     * @param obj Object to be compared to this
     * @return true if objects match; false otherwise
     */
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj instanceof DistributionPointName == false) {
            return false;
        }
        DistributionPointName other = (DistributionPointName)obj;

        return Objects.equals(this.fullName, other.fullName) &&
               Objects.equals(this.relativeName, other.relativeName);
    }

    /**
     * Returns the hash code for this distribution point name.
     *
     * @return the hash code.
     */
    public int hashCode() {
        int hash = hashCode;
        if (hash == 0) {
            hash = 1;
            if (fullName != null) {
                hash += fullName.hashCode();

            } else {
                hash += relativeName.hashCode();
            }
            hashCode = hash;
        }
        return hash;
    }

    /**
     * Returns a printable string of the distribution point name.
     */
    public String toString() {
        StringBuilder sb = new StringBuilder();
        if (fullName != null) {
            sb.append("DistributionPointName:\n     " + fullName + "\n");

        } else {
            sb.append("DistributionPointName:\n     " + relativeName + "\n");
        }

        return sb.toString();
    }
}