libjava/java/security/cert/PolicyQualifierInfo.java

   1 /* PolicyQualifierInfo.java -- policy qualifier info object.
   2    Copyright (C) 2003 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 java.io.ByteArrayInputStream;
  42 import java.io.ByteArrayOutputStream;
  43 import java.io.IOException;
  44
  45 import gnu.java.io.ASN1ParsingException;
  46 import gnu.java.security.OID;
  47 import gnu.java.security.der.DER;
  48 import gnu.java.security.der.DEREncodingException;
  49 import gnu.java.security.der.DERReader;
  50 import gnu.java.security.der.DERValue;
  51 import gnu.java.security.der.DERWriter;
  52
  53 /**
  54  * The PolicyQualifierInfo X.509 certificate extension.
  55  * PolicyQualifierInfo objects are represented by the ASN.1 structure:
  56  *
  57  * <pre>
  58  * PolicyQualifierInfo ::= SEQUENCE {
  59  *    policyQualifierId   PolicyQualifierId,
  60  *    qualifier           ANY DEFINED BY policyQualifierId
  61  * }
  62  *
  63  * PolicyQualifierId ::= OBJECT IDENTIFIER
  64  * </pre>
  65  *
  66  * @since JDK 1.4
  67  */
  68 public final class PolicyQualifierInfo
  69 {
  70
  71   // Fields.
  72   // ------------------------------------------------------------------------
  73
  74   /** The <code>policyQualifierId</code> field. */
  75   private OID oid;
  76
  77   /** The DER encoded form of this object. */
  78   private byte[] encoded;
  79
  80   /** The DER encoded form of the <code>qualifier</code> field. */
  81   private DERValue qualifier;
  82
  83   // Constructor.
  84   // ------------------------------------------------------------------------
  85
  86   /**
  87    * Create a new PolicyQualifierInfo object from the DER encoded form
  88    * passed in the byte array. The argument is copied.
  89    *
  90    * <p>The ASN.1 form of PolicyQualifierInfo is:
  91 <pre>
  92 PolicyQualifierInfo ::= SEQUENCE {
  93    policyQualifierId     PolicyQualifierId,
  94    qualifier             ANY DEFINED BY policyQualifierId
  95 }
  96
  97 PolicyQualifierId ::= OBJECT IDENTIFIER
  98 </pre>
  99    *
 100    * @param encoded The DER encoded form.
 101    * @throws IOException If the structure cannot be parsed from the
 102    *         encoded bytes.
 103    */
 104   public PolicyQualifierInfo(byte[] encoded) throws IOException
 105   {
 106     if (encoded == null)
 107       throw new IOException("null bytes");
 108     this.encoded = (byte[]) encoded.clone();
 109     DERReader in = new DERReader(new ByteArrayInputStream(this.encoded));
 110     DERValue qualInfo = in.read();
 111     if (!qualInfo.isConstructed())
 112       throw new ASN1ParsingException("malformed PolicyQualifierInfo");
 113     DERValue val = in.read();
 114     if (!(val.getValue() instanceof OID))
 115       throw new ASN1ParsingException("value read not an OBJECT IDENTIFIER");
 116     oid = (OID) val.getValue();
 117     if (val.getEncodedLength() < val.getLength())
 118       qualifier = in.read();
 119   }
 120
 121   // Instance methods.
 122   // ------------------------------------------------------------------------
 123
 124   /**
 125    * Returns the <code>policyQualifierId</code> field of this structure,
 126    * as a dotted-decimal representation of the object identifier.
 127    *
 128    * @return This structure's OID field.
 129    */
 130   public String getPolicyQualifierId()
 131   {
 132     return oid.toString();
 133   }
 134
 135   /**
 136    * Returns the DER encoded form of this object; the contents of the
 137    * returned byte array are equivalent to those that were passed to the
 138    * constructor. The byte array is cloned every time this method is
 139    * called.
 140    *
 141    * @return The encoded form.
 142    */
 143   public byte[] getEncoded()
 144   {
 145     return (byte[]) encoded.clone();
 146   }
 147
 148   /**
 149    * Get the <code>qualifier</code> field of this object, as a DER
 150    * encoded byte array. The byte array returned is cloned every time
 151    * this method is called.
 152    *
 153    * @return The encoded qualifier.
 154    */
 155   public byte[] getPolicyQualifier()
 156   {
 157     if (qualifier == null)
 158       return new byte[0];
 159     return qualifier.getEncoded();
 160   }
 161
 162   /**
 163    * Returns a printable string representation of this object.
 164    *
 165    * @return The string representation.
 166    */
 167   public String toString()
 168   {
 169     return "PolicyQualifierInfo { policyQualifierId ::= " + oid
 170       + ", qualifier ::= " + qualifier + " }";
 171   }
 172 }