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/*
* 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.remoting.loading;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashSet;
import java.util.Set;
import org.jboss.logging.Logger;
/**
* ClassUtil is a set of generic class utlities.
*
* @author Jeff Haynie
* @author Tom Elrod
* @version $Revision: 566 $
*/
public class ClassUtil
{
protected final static Logger log = Logger.getLogger(ClassUtil.class);
public static Object deserialize(ClassBytes cb, ClassLoader cl)
throws IOException, ClassNotFoundException
{
if(cb.getClassBytes() == null)
{
return null;
}
java.io.ByteArrayInputStream bis = new java.io.ByteArrayInputStream(cb.getClassBytes());
java.io.ObjectInputStream ois = new ObjectInputStreamWithClassLoader(bis, cl);
Object result = ois.readObject();
bis = null;
ois = null;
return result;
}
public static Object deserialize(byte buf[])
throws IOException, ClassNotFoundException
{
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if(cl == null)
{
cl = ClassUtil.class.getClassLoader();
}
return deserialize(buf, cl);
}
public static Object deserialize(byte buf[], ClassLoader cl)
throws IOException, ClassNotFoundException
{
if(buf == null)
{
return null;
}
java.io.ByteArrayInputStream bis = new java.io.ByteArrayInputStream(buf);
java.io.ObjectInputStream ois = new ObjectInputStreamWithClassLoader(bis, cl);
Object result = ois.readObject();
bis = null;
ois = null;
return result;
}
public static byte[] serialize(Object obj)
throws java.io.IOException
{
java.io.ByteArrayOutputStream bos = new java.io.ByteArrayOutputStream();
java.io.ObjectOutputStream oos = new java.io.ObjectOutputStream(bos);
oos.writeObject(obj);
oos.flush();
bos.flush();
byte buf[] = bos.toByteArray();
bos = null;
oos = null;
return buf;
}
public static boolean isArrayClass(String className)
{
return (className.startsWith("[L") && className.endsWith(";"));
}
public static String getArrayClassPart(String className)
{
String cn = className;
int i = className.indexOf("[L");
if(i > -1)
{
cn = className.substring(i + 2, className.length() - 1);
}
return cn;
}
public static String getPackageName(Class cl)
{
String n = cl.getName();
int i = n.lastIndexOf(".");
return (i > -1) ? n.substring(0, i) : n;
}
public static String getShortClassName(Class cl)
{
String n = cl.getName();
int i = n.lastIndexOf(".");
return (i > -1) ? n.substring(i + 1) : n;
}
/**
* given a class, recurse its dependency graph and find all its implemented interfaces
*
* @param clazz
* @return array of interfaces
*/
public static Class[] getInterfacesFor(Class clazz)
{
// use a set to eliminate duplicates, since you'll get a
// java.lang.ClassFormatError: $Proxy8 (Repetitive interface name))
Set set = new HashSet();
addInterfaces(set, clazz);
return (Class[]) set.toArray(new Class[set.size()]);
}
private static void addInterfaces(Set list, Class clazz)
{
if(clazz != null && clazz != Object.class)
{
if(clazz.isInterface() && list.contains(clazz) == false)
{
list.add(clazz);
}
Class interfaces[] = clazz.getInterfaces();
if(interfaces != null && interfaces.length > 0)
{
for(int c = 0; c < interfaces.length; c++)
{
Class interfaceClass = interfaces[c];
if(list.contains(interfaceClass) == false)
{
list.add(interfaceClass);
}
addInterfaces(list, interfaceClass);
}
}
addInterfaces(list, clazz.getSuperclass());
}
}
/**
* method is called to retrieve a byte array of a Class for a given class name
*
* @param className
* @return
*/
public static byte[] getClassBytes(String className, ClassLoader classbyteloader)
{
String cn = null;
if(isArrayClass(className))
{
// if requesting an array, of course, that would be found in our class path, so we
// need to strip the class data and just return the class part, the other side
// will properly load the class as an array
cn = getArrayClassPart(className).replace('.', '/') + ".class";
}
else
{
cn = className.replace('.', '/') + ".class";
}
if(log.isTraceEnabled())
{
log.trace("trying to load class: " + className + " from path: " + cn);
}
InputStream in = null;
ClassLoader cl = classbyteloader;
if(cl == null)
{
cl = ClassLoader.getSystemClassLoader();
}
if(cl != null)
{
in = cl.getResourceAsStream(cn);
if(in != null)
{
if(log.isTraceEnabled())
{
log.trace("looking for classes at: " + cl);
}
try
{
byte data[] = read(in);
if(log.isTraceEnabled())
{
log.trace("found class at classloader: " + cl);
}
return data;
}
catch(IOException io)
{
}
finally
{
if(in != null)
{
try
{
in.close();
}
catch(Exception ig)
{
}
in = null;
}
}
}
}
return null;
}
/**
* simple utility method for reading bytes from an input stream
*
* @param in
* @return
* @throws IOException
*/
protected static byte[] read(InputStream in)
throws IOException
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte buf[] = new byte[4096];
while(true)
{
int c = in.read(buf);
if(c < 0)
{
break;
}
out.write(buf, 0, c);
}
return out.toByteArray();
}
}
