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      1 package org.bouncycastle.asn1;
      2 
      3 import java.io.IOException;
      4 
      5 public abstract  class ASN1Object
      6     extends DERObject
      7 {
      8     /**
      9      * Create a base ASN.1 object from a byte stream.
     10      *
     11      * @param data the byte stream to parse.
     12      * @return the base ASN.1 object represented by the byte stream.
     13      * @exception IOException if there is a problem parsing the data.
     14      */
     15     public static ASN1Object fromByteArray(byte[] data)
     16         throws IOException
     17     {
     18         ASN1InputStream aIn = new ASN1InputStream(data);
     19 
     20         try
     21         {
     22             return (ASN1Object)aIn.readObject();
     23         }
     24         catch (ClassCastException e)
     25         {
     26             throw new IOException("cannot recognise object in stream");
     27         }
     28     }
     29 
     30     public final boolean equals(Object o)
     31     {
     32         if (this == o)
     33         {
     34             return true;
     35         }
     36 
     37         return (o instanceof DEREncodable) && asn1Equals(((DEREncodable)o).getDERObject());
     38     }
     39 
     40     public abstract int hashCode();
     41 
     42     abstract void encode(DEROutputStream out) throws IOException;
     43 
     44     abstract boolean asn1Equals(DERObject o);
     45 }
     46