| /* 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.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); |
| |
| StringBuffer sbuf = new StringBuffer(); |
| 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 (); |
| } |
| } |
| |