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jlechner |
/* RMIHashes.java --
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Copyright (c) 1996, 1997, 1998, 1999, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.rmi.server;
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import gnu.java.lang.reflect.TypeSignature;
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import java.io.ByteArrayOutputStream;
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import java.io.DataOutputStream;
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import java.lang.reflect.Method;
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import java.security.MessageDigest;
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public class RMIHashes
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{
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//There're other places using DigestOutputStream to generate hash in classpath, but I think the way I used
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//here is more efficient, anyway, you can switch to DigestOutputStream by doing like "//or:" comments say.
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//or:add this statement: private static final NullOutputStream nullOutputStream = new NullOutputStream ();
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public static long getMethodHash(Method meth)
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{
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//Object Serialization Spec 8.3
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try
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{
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MessageDigest md = MessageDigest.getInstance ("SHA");
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//or:remove this statement: DigestOutputStream digest_out = new DigestOutputStream (nullOutputStream, md);
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ByteArrayOutputStream digest_out = new ByteArrayOutputStream();
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DataOutputStream data_out = new DataOutputStream (digest_out);
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StringBuffer sbuf = new StringBuffer();
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sbuf.append(meth.getName());
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sbuf.append('(');
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Class params[] = meth.getParameterTypes();
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for(int i = 0; i < params.length; i++)
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sbuf.append(TypeSignature.getEncodingOfClass(params[i]));
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sbuf.append(')');
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Class rcls = meth.getReturnType();
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if(rcls != Void.TYPE)
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sbuf.append(TypeSignature.getEncodingOfClass(rcls));
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else
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sbuf.append('V');
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data_out.writeUTF (sbuf.toString());
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data_out.flush();
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data_out.close ();
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md.update(digest_out.toByteArray()); //or:remove this statement
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byte[] sha = md.digest ();
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long result = 0;
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int len = sha.length < 8 ? sha.length : 8;
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for (int i=0; i < len; i++)
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result += (long)(sha[i] & 0xFF) << (8 * i);
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return result;
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}catch(Exception _){
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return -1L;
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}
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}
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public static long getInterfaceHash(Class clazz)
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{
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return clazz.hashCode ();
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}
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}
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