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package sun.security.ssl;

import java.security.SecureRandom;

Encapsulates an SSL session ID.  SSL Session IDs are not reused by
servers during the lifetime of any sessions it created.  Sessions may
be used by many connections, either concurrently (for example, two
connections to a web server at the same time) or sequentially (over as
long a time period as is allowed by a given server).
Author:
Satish Dharmaraj, David Brownell/**
 * Encapsulates an SSL session ID.  SSL Session IDs are not reused by
 * servers during the lifetime of any sessions it created.  Sessions may
 * be used by many connections, either concurrently (for example, two
 * connections to a web server at the same time) or sequentially (over as
 * long a time period as is allowed by a given server).
 *
 * @author Satish Dharmaraj
 * @author David Brownell
 */
final
class SessionId
{
    private byte sessionId [];          // max 32 bytes

    
Constructs a new session ID ... perhaps for a rejoinable session /** Constructs a new session ID ... perhaps for a rejoinable session */
    SessionId (boolean isRejoinable, SecureRandom generator)
    {
        if (isRejoinable)
            // this will be unique, it's a timestamp plus much randomness
            sessionId = new RandomCookie (generator).random_bytes;
        else
            sessionId = new byte [0];
    }

    
Constructs a session ID from a byte array (max size 32 bytes) /** Constructs a session ID from a byte array (max size 32 bytes) */
    SessionId (byte sessionId [])
        { this.sessionId = sessionId; }

    
Returns the length of the ID, in bytes /** Returns the length of the ID, in bytes */
    int length ()
        { return sessionId.length; }

    
Returns the bytes in the ID.  May be an empty array.  /** Returns the bytes in the ID.  May be an empty array.  */
    byte [] getId ()
    {
        return sessionId.clone ();
    }

    
Returns the ID as a string /** Returns the ID as a string */
    public String toString ()
    {
        int             len = sessionId.length;
        StringBuffer    s = new StringBuffer (10 + 2 * len);

        s.append ("{");
        for (int i = 0; i < len; i++) {
            s.append (0x0ff & sessionId [i]);
            if (i != (len - 1))
                s.append (", ");
        }
        s.append ("}");
        return s.toString ();
    }


    
Returns a value which is the same for session IDs which are equal /** Returns a value which is the same for session IDs which are equal */
    public int hashCode ()
    {
        int     retval = 0;

        for (int i = 0; i < sessionId.length; i++)
            retval += sessionId [i];
        return retval;
    }

    
Returns true if the parameter is the same session ID /** Returns true if the parameter is the same session ID */
    public boolean equals (Object obj)
    {
        if (!(obj instanceof SessionId))
            return false;

        SessionId s = (SessionId) obj;
        byte b [] = s.getId ();

        if (b.length != sessionId.length)
            return false;
        for (int i = 0; i < sessionId.length; i++) {
            if (b [i] != sessionId [i])
                return false;
        }
        return true;
    }
}