Initial revision

From-SVN: r102074
2005-07-16 00:30:23 +00:00
parent 6f4434b39b
commit f911ba985a
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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.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 ();
+  }
+}
+