/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.aop.util;
import javassist.CtClass;
import javassist.CtConstructor;
import javassist.CtMethod;
import javassist.Modifier;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import java.util.HashMap;
/**
* Create a unique hash for method. This is the same as
* common: org.jboss.util.MethodHashing except that
* it's using Javasssit constructs rather than java.lang.reflect.
*
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @author <a href="mailto:marc@jboss.org">Marc Fleury</a>
* @version $Revision: 110623 $
*/
public class JavassistMethodHashing
{
public static long methodHash(CtMethod method)
{
try
{
CtClass[] parameterTypes = method.getParameterTypes();
String methodDesc = method.getName()+"(";
for(int j = 0; j < parameterTypes.length; j++)
{
methodDesc += getTypeString(parameterTypes[j]);
}
methodDesc += ")"+getTypeString(method.getReturnType());
long hash = 0;
ByteArrayOutputStream bytearrayoutputstream = new ByteArrayOutputStream(512);
MessageDigest messagedigest = MessageDigest.getInstance("SHA");
DataOutputStream dataoutputstream = new DataOutputStream(new DigestOutputStream(bytearrayoutputstream, messagedigest));
dataoutputstream.writeUTF(methodDesc);
dataoutputstream.flush();
byte abyte0[] = messagedigest.digest();
for(int j = 0; j < Math.min(8, abyte0.length); j++)
hash += (long)(abyte0[j] & 0xff) << j * 8;
return hash;
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
public static long constructorHash(CtConstructor method)
{
try
{
CtClass[] parameterTypes = method.getParameterTypes();
String methodDesc = method.getDeclaringClass().getName()+"(";
for(int j = 0; j < parameterTypes.length; j++)
{
methodDesc += getTypeString(parameterTypes[j]);
}
methodDesc += ")";
long hash = 0;
ByteArrayOutputStream bytearrayoutputstream = new ByteArrayOutputStream(512);
MessageDigest messagedigest = MessageDigest.getInstance("SHA");
DataOutputStream dataoutputstream = new DataOutputStream(new DigestOutputStream(bytearrayoutputstream, messagedigest));
dataoutputstream.writeUTF(methodDesc);
dataoutputstream.flush();
byte abyte0[] = messagedigest.digest();
for(int j = 0; j < Math.min(8, abyte0.length); j++)
hash += (long)(abyte0[j] & 0xff) << j * 8;
return hash;
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
static String getTypeString(CtClass cl)
throws Exception
{
if (cl.equals(CtClass.byteType))
{
return "B";
} else if (cl.equals(CtClass.charType))
{
return "C";
} else if (cl.equals(CtClass.doubleType))
{
return "D";
} else if (cl.equals(CtClass.floatType))
{
return "F";
} else if (cl.equals(CtClass.intType))
{
return "I";
} else if (cl.equals(CtClass.longType))
{
return "J";
} else if (cl.equals(CtClass.shortType))
{
return "S";
} else if (cl.equals(CtClass.booleanType))
{
return "Z";
} else if (cl.equals(CtClass.voidType))
{
return "V";
} else if (cl.isArray())
{
return "["+getTypeString(cl.getComponentType());
} else
{
return "L"+cl.getName().replace('.','/')+";";
}
}
private static void addDeclaredMethods(HashMap<Long, CtMethod> advised, CtClass superclass) throws Exception
{
CtMethod[] declaredMethods = superclass.getDeclaredMethods();
for (int i = 0; i < declaredMethods.length; i++)
{
if (superclass.isInterface() || Advisable.isAdvisable(declaredMethods[i]))
{
Long hash = methodHash(declaredMethods[i]);
if(Modifier.isVolatile(declaredMethods[i].getModifiers()))
{
advised.remove(hash);
}
else
{
advised.put(Long.valueOf(hash), declaredMethods[i]);
}
}
}
}
private static void populateMethodTables(HashMap<Long, CtMethod> advised, CtClass superclass)
throws Exception
{
if (superclass == null) return;
if (superclass.getName().equals("java.lang.Object")) return;
if (superclass.isInterface())
{
CtClass[] ifs = superclass.getInterfaces();
for (int i = 0 ; i < ifs.length ; i++)
{
populateMethodTables(advised, ifs[i]);
}
addDeclaredMethods(advised, superclass);
}
else
{
populateMethodTables(advised, superclass.getSuperclass());
addDeclaredMethods(advised, superclass);
}
}
public static HashMap<Long, CtMethod> getMethodMap(CtClass clazz) throws Exception
{
HashMap<Long, CtMethod> map = new HashMap<Long, CtMethod>();
populateMethodTables(map, clazz);
return map;
}
public static HashMap<Long, CtMethod> getDeclaredMethodMap(CtClass clazz) throws Exception
{
HashMap<Long, CtMethod> map = new HashMap<Long, CtMethod>();
addDeclaredMethods(map, clazz);
return map;
}
}