/*
* 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 java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import java.util.HashMap;
import org.jboss.reflect.spi.ArrayInfo;
import org.jboss.reflect.spi.ClassInfo;
import org.jboss.reflect.spi.ConstructorInfo;
import org.jboss.reflect.spi.MethodInfo;
import org.jboss.reflect.spi.PrimitiveInfo;
import org.jboss.reflect.spi.TypeInfo;
/**
* Experimental version of method hashing for the container Class-/Method-/ConstructorInfos
*
* @author <a href="kabir.khan@jboss.com">Kabir Khan</a>
* @version $Revision: 110623 $
*/
public class ClassInfoMethodHashing
{
public static long methodHash(MethodInfo methodInfo)
{
try
{
TypeInfo[] parameterTypes = methodInfo.getParameterTypes();
String methodDesc = methodInfo.getName()+"(";
for(int j = 0; j < parameterTypes.length; j++)
{
methodDesc += getTypeString(parameterTypes[j]);
}
methodDesc += ")"+getTypeString(methodInfo.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(ConstructorInfo constructorInfo)
{
try
{
TypeInfo[] parameterTypes = constructorInfo.getParameterTypes();
String methodDesc = constructorInfo.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(TypeInfo cl)
throws Exception
{
if (cl.getClass().equals(PrimitiveInfo.class))
{
if (cl.equals(PrimitiveInfo.BYTE))
{
return "B";
}
else if (cl.equals(PrimitiveInfo.CHAR))
{
return "C";
}
else if (cl.equals(PrimitiveInfo.DOUBLE))
{
return "D";
}
else if (cl.equals(PrimitiveInfo.FLOAT))
{
return "F";
}
else if (cl.equals(PrimitiveInfo.INT))
{
return "I";
}
else if (cl.equals(PrimitiveInfo.LONG))
{
return "J";
}
else if (cl.equals(PrimitiveInfo.SHORT))
{
return "S";
}
else if (cl.equals(PrimitiveInfo.BOOLEAN))
{
return "Z";
}
else if (cl.equals(PrimitiveInfo.VOID))
{
return "V";
}
else
{
throw new RuntimeException("Invalid primitive info " + cl);
}
}
else if (cl.isArray())
{
TypeInfo arrayType = ((ArrayInfo)cl).getComponentType();
return "["+getTypeString(arrayType);
}
else
{
return "L"+cl.getName().replace('.','/')+";";
}
}
private static void addDeclaredMethods(HashMap<Long, MethodInfo> advised, ClassInfo superclass) throws Exception
{
MethodInfo[] declaredMethods = superclass.getDeclaredMethods();
if (declaredMethods != null)
{
for (int i = 0; i < declaredMethods.length; i++)
{
if (superclass.isInterface() || Advisable.isAdvisableMethod(declaredMethods[i].getModifiers(), declaredMethods[i].getName()))
{
long hash = methodHash(declaredMethods[i]);
advised.put(Long.valueOf(hash), declaredMethods[i]);
}
}
}
}
private static void populateMethodTables(HashMap<Long, MethodInfo> advised, ClassInfo superclass)
throws Exception
{
if (superclass == null) return;
if (superclass.getName().equals("java.lang.Object")) return;
populateMethodTables(advised, superclass.getSuperclass());
addDeclaredMethods(advised, superclass);
}
public static HashMap<Long, MethodInfo> getMethodMap(ClassInfo clazz) throws Exception
{
HashMap<Long, MethodInfo> map = new HashMap<Long, MethodInfo>();
populateMethodTables(map, clazz);
return map;
}
public static HashMap<Long, MethodInfo> getDeclaredMethodMap(ClassInfo clazz) throws Exception
{
HashMap<Long, MethodInfo> map = new HashMap<Long, MethodInfo>();
addDeclaredMethods(map, clazz);
return map;
}
}