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/* RMIHashes.java --

   Copyright (c) 1996, 1997, 1998, 1999, 2004  Free Software Foundation, Inc.

This file is 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, 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; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, 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.java.rmi.server;

import gnu.java.lang.CPStringBuilder;

import gnu.java.lang.reflect.TypeSignature;

import java.io.ByteArrayOutputStream;

import java.io.DataOutputStream;

import java.lang.reflect.Method;

import java.security.MessageDigest;

public class RMIHashes

{

  //There're other places using DigestOutputStream to generate hash in classpath, but I think the way I used

  //here is more efficient, anyway, you can switch to DigestOutputStream by doing like "//or:" comments say.

  //or:add this statement: private static final NullOutputStream nullOutputStream = new NullOutputStream ();

  public static long getMethodHash(Method meth)

  {

    //Object Serialization Spec 8.3

    try

    {

        MessageDigest md = MessageDigest.getInstance ("SHA");

        //or:remove this statement: DigestOutputStream digest_out = new DigestOutputStream (nullOutputStream, md);

        ByteArrayOutputStream digest_out = new ByteArrayOutputStream();

        DataOutputStream data_out = new DataOutputStream (digest_out);

        CPStringBuilder sbuf = new CPStringBuilder();

        sbuf.append(meth.getName());

        sbuf.append('(');

        Class params[] = meth.getParameterTypes();

        for(int i = 0; i < params.length; i++)

            sbuf.append(TypeSignature.getEncodingOfClass(params[i]));

        sbuf.append(')');

        Class rcls = meth.getReturnType();

        if(rcls != Void.TYPE)

            sbuf.append(TypeSignature.getEncodingOfClass(rcls));

        else

            sbuf.append('V');

        data_out.writeUTF (sbuf.toString());

        data_out.flush();

        data_out.close ();

        md.update(digest_out.toByteArray()); //or:remove this statement

        byte[] sha = md.digest ();

        long result = 0;

        int len = sha.length < 8 ? sha.length : 8;

        for (int i=0; i < len; i++)

            result += (long)(sha[i] & 0xFF) << (8 * i);

        return result;

    }catch(Exception _){

        return -1L;

        }

  }

  public static long getInterfaceHash(Class clazz)

  {

    return clazz.hashCode ();

  }

}