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/* ProtocolVersion.java -- An SSL version number.

   Copyright (C) 2006  Free Software Foundation, Inc.

This file is a part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or (at

your option) any later version.

GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301

USA

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version.  */

package gnu.javax.net.ssl.provider;

import java.io.InputStream;

import java.io.IOException;

public final class ProtocolVersion

  implements Comparable<ProtocolVersion>, Constructed

{

  // Constants and fields.

  // -------------------------------------------------------------------------

  public static final ProtocolVersion SSL_3 = new ProtocolVersion(3, 0);

  public static final ProtocolVersion TLS_1 = new ProtocolVersion(3, 1);

  public static final ProtocolVersion TLS_1_1 = new ProtocolVersion(3, 2);

  private final int major;

  private final int minor;

  // Constructor.

  // -------------------------------------------------------------------------

  private ProtocolVersion(int major, int minor)

  {

    this.major = major;

    this.minor = minor;

  }

  // Class methods.

  // -------------------------------------------------------------------------

  public static ProtocolVersion read(InputStream in) throws IOException

  {

    int major = in.read() & 0xFF;

    int minor = in.read() & 0xFF;

    return getInstance(major, minor);

  }

  public static ProtocolVersion forName (final String name)

  {

    if (name.equalsIgnoreCase ("SSLv3"))

      return SSL_3;

    if (name.equalsIgnoreCase ("TLSv1"))

      return TLS_1;

    if (name.equalsIgnoreCase("TLSv1.1"))

      return TLS_1_1;

    throw new IllegalArgumentException ("unknown protocol name: " + name);

  }

  public static ProtocolVersion getInstance(final int major, final int minor)

  {

    if (major == 3)

      {

        switch (minor)

          {

          case 0: return SSL_3;

          case 1: return TLS_1;

          case 2: return TLS_1_1;

          }

      }

    return new ProtocolVersion(major, minor);

  }

  public static ProtocolVersion getInstance (final short raw_value)

  {

    int major = raw_value >>> 8 & 0xFF;

    int minor = raw_value & 0xFF;

    return getInstance (major, minor);

  }

  // Instance methods.

  // -------------------------------------------------------------------------

  public int length ()

  {

    return 2;

  }

  public byte[] getEncoded()

  {

    return new byte[] {

      (byte) major, (byte) minor

    };

  }

  public int major()

  {

    return major;

  }

  public int minor()

  {

    return minor;

  }

  public int rawValue ()

  {

    return (major << 8) | minor;

  }

  public boolean equals(Object o)

  {

    if (!(o instanceof ProtocolVersion))

      {

        return false;

      }

    return ((ProtocolVersion) o).major == this.major

        && ((ProtocolVersion) o).minor == this.minor;

  }

  public int hashCode()

  {

    return major << 8 | minor;

  }

  public int compareTo(ProtocolVersion that)

  {

    if (major > that.major)

      {

        return 1;

      }

    else if (major < that.major)

      {

        return -1;

      }

    if (minor > that.minor)

      {

        return 1;

      }

    else if (minor < that.minor)

      {

        return -1;

      }

    return 0;

  }

  public String toString (String prefix)

  {

    return toString ();

  }

  public String toString()

  {

    if (this == SSL_3)

      {

        return "SSLv3";

      }

    else if (this == TLS_1)

      {

        return "TLSv1";

      }

    else if (this == TLS_1_1)

      {

        return "TLSv1.1";

      }

    else

      {

        return "Unsupported; major=" + major + " minor=" + minor;

      }

  }

}