001    /* PolicyQualifierInfo.java -- policy qualifier info object.
002       Copyright (C) 2003, 2004  Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    
039    package java.security.cert;
040    
041    import gnu.java.io.ASN1ParsingException;
042    import gnu.java.security.OID;
043    import gnu.java.security.der.DERReader;
044    import gnu.java.security.der.DERValue;
045    
046    import java.io.ByteArrayInputStream;
047    import java.io.IOException;
048    
049    /**
050     * The PolicyQualifierInfo X.509 certificate extension.
051     * PolicyQualifierInfo objects are represented by the ASN.1 structure:
052     *
053     * <pre>
054     * PolicyQualifierInfo ::= SEQUENCE {
055     *    policyQualifierId   PolicyQualifierId,
056     *    qualifier           ANY DEFINED BY policyQualifierId
057     * }
058     *
059     * PolicyQualifierId ::= OBJECT IDENTIFIER
060     * </pre>
061     *
062     * @since 1.4
063     * @specnote this class was final in 1.4, but beginning with 1.5 is not
064     */
065    public class PolicyQualifierInfo
066    {
067    
068      // Fields.
069      // ------------------------------------------------------------------------
070    
071      /** The <code>policyQualifierId</code> field. */
072      private OID oid;
073    
074      /** The DER encoded form of this object. */
075      private byte[] encoded;
076    
077      /** The DER encoded form of the <code>qualifier</code> field. */
078      private DERValue qualifier;
079    
080      // Constructor.
081      // ------------------------------------------------------------------------
082    
083      /**
084       * Create a new PolicyQualifierInfo object from the DER encoded form
085       * passed in the byte array. The argument is copied.
086       *
087       * <p>The ASN.1 form of PolicyQualifierInfo is:
088    <pre>
089    PolicyQualifierInfo ::= SEQUENCE {
090       policyQualifierId     PolicyQualifierId,
091       qualifier             ANY DEFINED BY policyQualifierId
092    }
093    
094    PolicyQualifierId ::= OBJECT IDENTIFIER
095    </pre>
096       *
097       * @param encoded The DER encoded form.
098       * @throws IOException If the structure cannot be parsed from the
099       *         encoded bytes.
100       */
101      public PolicyQualifierInfo(byte[] encoded) throws IOException
102      {
103        if (encoded == null)
104          throw new IOException("null bytes");
105        this.encoded = (byte[]) encoded.clone();
106        DERReader in = new DERReader(new ByteArrayInputStream(this.encoded));
107        DERValue qualInfo = in.read();
108        if (!qualInfo.isConstructed())
109          throw new ASN1ParsingException("malformed PolicyQualifierInfo");
110        DERValue val = in.read();
111        if (!(val.getValue() instanceof OID))
112          throw new ASN1ParsingException("value read not an OBJECT IDENTIFIER");
113        oid = (OID) val.getValue();
114        if (val.getEncodedLength() < val.getLength())
115          qualifier = in.read();
116      }
117    
118      // Instance methods.
119      // ------------------------------------------------------------------------
120    
121      /**
122       * Returns the <code>policyQualifierId</code> field of this structure,
123       * as a dotted-decimal representation of the object identifier.
124       *
125       * @return This structure's OID field.
126       */
127      public final String getPolicyQualifierId()
128      {
129        return oid.toString();
130      }
131    
132      /**
133       * Returns the DER encoded form of this object; the contents of the
134       * returned byte array are equivalent to those that were passed to the
135       * constructor. The byte array is cloned every time this method is
136       * called.
137       *
138       * @return The encoded form.
139       */
140      public final byte[] getEncoded()
141      {
142        return (byte[]) encoded.clone();
143      }
144    
145      /**
146       * Get the <code>qualifier</code> field of this object, as a DER
147       * encoded byte array. The byte array returned is cloned every time
148       * this method is called.
149       *
150       * @return The encoded qualifier.
151       */
152      public final byte[] getPolicyQualifier()
153      {
154        if (qualifier == null)
155          return new byte[0];
156        return qualifier.getEncoded();
157      }
158    
159      /**
160       * Returns a printable string representation of this object.
161       *
162       * @return The string representation.
163       */
164      public String toString()
165      {
166        return "PolicyQualifierInfo { policyQualifierId ::= " + oid
167          + ", qualifier ::= " + qualifier + " }";
168      }
169    }