src/org/bouncycastle/asn1/x509/BasicConstraints.java

   1 package org.bouncycastle.asn1.x509;
   2
   3 import java.math.BigInteger;
   4
   5 import org.bouncycastle.asn1.*;
   6
   7 public class BasicConstraints
   8     implements DEREncodable
   9 {
  10     DERBoolean  cA = new DERBoolean(false);
  11     DERInteger  pathLenConstraint = null;
  12
  13     public static BasicConstraints getInstance(
  14         ASN1TaggedObject obj,
  15         boolean          explicit)
  16     {
  17         return getInstance(ASN1Sequence.getInstance(obj, explicit));
  18     }
  19
  20     public static BasicConstraints getInstance(
  21         Object  obj)
  22     {
  23         if (obj instanceof BasicConstraints)
  24         {
  25             return (BasicConstraints)obj;
  26         }
  27         else if (obj instanceof ASN1Sequence)
  28         {
  29             return new BasicConstraints((ASN1Sequence)obj);
  30         }
  31
  32         throw new IllegalArgumentException("unknown object in factory");
  33     }
  34
  35     public BasicConstraints(
  36         ASN1Sequence   seq)
  37     {
  38         if (seq.size() != 0)
  39         {
  40             this.cA = (DERBoolean)seq.getObjectAt(0);
  41             this.pathLenConstraint = (DERInteger)seq.getObjectAt(1);
  42         }
  43     }
  44
  45     public BasicConstraints(
  46         boolean cA,
  47         int     pathLenConstraint)
  48     {
  49         this.cA = new DERBoolean(cA);
  50         this.pathLenConstraint = new DERInteger(pathLenConstraint);
  51     }
  52
  53     public BasicConstraints(
  54         boolean cA)
  55     {
  56         this.cA = new DERBoolean(cA);
  57         this.pathLenConstraint = null;
  58     }
  59
  60     public boolean isCA()
  61     {
  62         return cA.isTrue();
  63     }
  64
  65     public BigInteger getPathLenConstraint()
  66     {
  67         if (pathLenConstraint != null)
  68         {
  69             return pathLenConstraint.getValue();
  70         }
  71
  72         return null;
  73     }
  74
  75     /**
  76      * <pre>
  77      * BasicConstraints := SEQUENCE {
  78      *    cA                  BOOLEAN DEFAULT FALSE,
  79      *    pathLenConstraint   INTEGER (0..MAX) OPTIONAL
  80      * }
  81      * </pre>
  82      */
  83     public DERObject getDERObject()
  84     {
  85         DERConstructedSequence  seq = new DERConstructedSequence();
  86
  87         seq.addObject(cA);
  88
  89         if (pathLenConstraint != null)
  90         {
  91             seq.addObject(pathLenConstraint);
  92         }
  93
  94         return seq;
  95     }
  96
  97     public String toString()
  98     {
  99         return "BasicConstraints: isCa(" + this.isCA() + "), pathLenConstraint = " + pathLenConstraint.getValue();
 100     }
 101 }