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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   * This code is free software; you can redistribute it and/or modify it
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   * published by the Free Software Foundation.  Oracle designates this
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   * 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).
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   * You should have received a copy of the GNU General Public License version
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   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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  package java.security.cert;
  
  import java.io.IOException;
  
  import sun.misc.HexDumpEncoder;
  import sun.security.util.DerValue;
  
  /**
   * An immutable policy qualifier represented by the ASN.1 PolicyQualifierInfo
   * structure.
   *
   * <p>The ASN.1 definition is as follows:
   * <pre>
   *   PolicyQualifierInfo ::= SEQUENCE {
   *        policyQualifierId       PolicyQualifierId,
   *        qualifier               ANY DEFINED BY policyQualifierId }
   * </pre>
   * <p>
   * A certificate policies extension, if present in an X.509 version 3
   * certificate, contains a sequence of one or more policy information terms,
   * each of which consists of an object identifier (OID) and optional
   * qualifiers. In an end-entity certificate, these policy information terms
   * indicate the policy under which the certificate has been issued and the
   * purposes for which the certificate may be used. In a CA certificate, these
   * policy information terms limit the set of policies for certification paths
   * which include this certificate.
   * <p>
   * A {@code Set} of {@code PolicyQualifierInfo} objects are returned
   * by the {@link PolicyNode#getPolicyQualifiers PolicyNode.getPolicyQualifiers}
   * method. This allows applications with specific policy requirements to
   * process and validate each policy qualifier. Applications that need to
   * process policy qualifiers should explicitly set the
   * {@code policyQualifiersRejected} flag to false (by calling the
   * {@link PKIXParameters#setPolicyQualifiersRejected
   * PKIXParameters.setPolicyQualifiersRejected} method) before validating
   * a certification path.
   *
   * <p>Note that the PKIX certification path validation algorithm specifies
   * that any policy qualifier in a certificate policies extension that is
   * marked critical must be processed and validated. Otherwise the
   * certification path must be rejected. If the
   * {@code policyQualifiersRejected} flag is set to false, it is up to
   * the application to validate all policy qualifiers in this manner in order
   * to be PKIX compliant.
   *
   * <p><b>Concurrent Access</b>
   *
   * <p>All {@code PolicyQualifierInfo} objects must be immutable and
   * thread-safe. That is, multiple threads may concurrently invoke the
   * methods defined in this class on a single {@code PolicyQualifierInfo}
   * object (or more than one) with no ill effects. Requiring
   * {@code PolicyQualifierInfo} objects to be immutable and thread-safe
   * allows them to be passed around to various pieces of code without
   * worrying about coordinating access.
   *
   * @author      seth proctor
   * @author      Sean Mullan
   * @since       1.4
   */
  public class PolicyQualifierInfo {
  
      private byte [] mEncoded;
      private String mId;
      private byte [] mData;
      private String pqiString;
  
      /**
       * Creates an instance of {@code PolicyQualifierInfo} from the
       * encoded bytes. The encoded byte array is copied on construction.
       *
       * @param encoded a byte array containing the qualifier in DER encoding
       * @exception IOException thrown if the byte array does not represent a
       * valid and parsable policy qualifier
       */
      public PolicyQualifierInfo(byte[] encoded) throws IOException {
          mEncoded = encoded.clone();
  
          DerValue val = new DerValue(mEncoded);
          if (val.tag != DerValue.tag_Sequence)
              throw new IOException("Invalid encoding for PolicyQualifierInfo");
  
          mId = (val.data.getDerValue()).getOID().toString();
          byte [] tmp = val.data.toByteArray();
          if (tmp == null) {
              mData = null;
          } else {
              mData = new byte[tmp.length];
              System.arraycopy(tmp, 0, mData, 0, tmp.length);
          }
      }
  
      /**
       * Returns the {@code policyQualifierId} field of this
       * {@code PolicyQualifierInfo}. The {@code policyQualifierId}
       * is an Object Identifier (OID) represented by a set of nonnegative
       * integers separated by periods.
       *
       * @return the OID (never {@code null})
       */
      public final String getPolicyQualifierId() {
          return mId;
      }
  
      /**
       * Returns the ASN.1 DER encoded form of this
       * {@code PolicyQualifierInfo}.
       *
       * @return the ASN.1 DER encoded bytes (never {@code null}).
       * Note that a copy is returned, so the data is cloned each time
       * this method is called.
       */
      public final byte[] getEncoded() {
          return mEncoded.clone();
      }
  
      /**
       * Returns the ASN.1 DER encoded form of the {@code qualifier}
       * field of this {@code PolicyQualifierInfo}.
       *
       * @return the ASN.1 DER encoded bytes of the {@code qualifier}
       * field. Note that a copy is returned, so the data is cloned each
       * time this method is called.
       */
      public final byte[] getPolicyQualifier() {
          return (mData == null ? null : mData.clone());
      }
  
      /**
       * Return a printable representation of this
       * {@code PolicyQualifierInfo}.
       *
       * @return a {@code String} describing the contents of this
       *         {@code PolicyQualifierInfo}
       */
      public String toString() {
          if (pqiString != null)
              return pqiString;
          HexDumpEncoder enc = new HexDumpEncoder();
          StringBuffer sb = new StringBuffer();
          sb.append("PolicyQualifierInfo: [\n");
          sb.append("  qualifierID: " + mId + "\n");
          sb.append("  qualifier: " +
              (mData == null ? "null" : enc.encodeBuffer(mData)) + "\n");
          sb.append("]");
          pqiString = sb.toString();
          return pqiString;
      }
  }
  