libjava/java/security/cert/PolicyQualifierInfo.java

   1 /* PolicyQualifierInfo.java -- policy qualifier info object.
   2    Copyright (C) 2003, 2004  Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package java.security.cert;
  40
  41 import gnu.java.io.ASN1ParsingException;
  42 import gnu.java.security.OID;
  43 import gnu.java.security.der.DERReader;
  44 import gnu.java.security.der.DERValue;
  45
  46 import java.io.ByteArrayInputStream;
  47 import java.io.IOException;
  48
  49 /**
  50  * The PolicyQualifierInfo X.509 certificate extension.
  51  * PolicyQualifierInfo objects are represented by the ASN.1 structure:
  52  *
  53  * <pre>
  54  * PolicyQualifierInfo ::= SEQUENCE {
  55  *    policyQualifierId   PolicyQualifierId,
  56  *    qualifier           ANY DEFINED BY policyQualifierId
  57  * }
  58  *
  59  * PolicyQualifierId ::= OBJECT IDENTIFIER
  60  * </pre>
  61  *
  62  * @since JDK 1.4
  63  */
  64 public final class PolicyQualifierInfo
  65 {
  66
  67   // Fields.
  68   // ------------------------------------------------------------------------
  69
  70   /** The <code>policyQualifierId</code> field. */
  71   private OID oid;
  72
  73   /** The DER encoded form of this object. */
  74   private byte[] encoded;
  75
  76   /** The DER encoded form of the <code>qualifier</code> field. */
  77   private DERValue qualifier;
  78
  79   // Constructor.
  80   // ------------------------------------------------------------------------
  81
  82   /**
  83    * Create a new PolicyQualifierInfo object from the DER encoded form
  84    * passed in the byte array. The argument is copied.
  85    *
  86    * <p>The ASN.1 form of PolicyQualifierInfo is:
  87 <pre>
  88 PolicyQualifierInfo ::= SEQUENCE {
  89    policyQualifierId     PolicyQualifierId,
  90    qualifier             ANY DEFINED BY policyQualifierId
  91 }
  92
  93 PolicyQualifierId ::= OBJECT IDENTIFIER
  94 </pre>
  95    *
  96    * @param encoded The DER encoded form.
  97    * @throws IOException If the structure cannot be parsed from the
  98    *         encoded bytes.
  99    */
 100   public PolicyQualifierInfo(byte[] encoded) throws IOException
 101   {
 102     if (encoded == null)
 103       throw new IOException("null bytes");
 104     this.encoded = (byte[]) encoded.clone();
 105     DERReader in = new DERReader(new ByteArrayInputStream(this.encoded));
 106     DERValue qualInfo = in.read();
 107     if (!qualInfo.isConstructed())
 108       throw new ASN1ParsingException("malformed PolicyQualifierInfo");
 109     DERValue val = in.read();
 110     if (!(val.getValue() instanceof OID))
 111       throw new ASN1ParsingException("value read not an OBJECT IDENTIFIER");
 112     oid = (OID) val.getValue();
 113     if (val.getEncodedLength() < val.getLength())
 114       qualifier = in.read();
 115   }
 116
 117   // Instance methods.
 118   // ------------------------------------------------------------------------
 119
 120   /**
 121    * Returns the <code>policyQualifierId</code> field of this structure,
 122    * as a dotted-decimal representation of the object identifier.
 123    *
 124    * @return This structure's OID field.
 125    */
 126   public String getPolicyQualifierId()
 127   {
 128     return oid.toString();
 129   }
 130
 131   /**
 132    * Returns the DER encoded form of this object; the contents of the
 133    * returned byte array are equivalent to those that were passed to the
 134    * constructor. The byte array is cloned every time this method is
 135    * called.
 136    *
 137    * @return The encoded form.
 138    */
 139   public byte[] getEncoded()
 140   {
 141     return (byte[]) encoded.clone();
 142   }
 143
 144   /**
 145    * Get the <code>qualifier</code> field of this object, as a DER
 146    * encoded byte array. The byte array returned is cloned every time
 147    * this method is called.
 148    *
 149    * @return The encoded qualifier.
 150    */
 151   public byte[] getPolicyQualifier()
 152   {
 153     if (qualifier == null)
 154       return new byte[0];
 155     return qualifier.getEncoded();
 156   }
 157
 158   /**
 159    * Returns a printable string representation of this object.
 160    *
 161    * @return The string representation.
 162    */
 163   public String toString()
 164   {
 165     return "PolicyQualifierInfo { policyQualifierId ::= " + oid
 166       + ", qualifier ::= " + qualifier + " }";
 167   }
 168 }