package org.jboss.util;import java.io.InputStream;import java.io.IOException;import java.net.URL;import org.apache.log4j.Hierarchy;import org.apache.log4j.Level;import org.apache.log4j.LogManager;import org.apache.log4j.spi.RepositorySelector;import org.apache.log4j.spi.LoggerRepository;import org.apache.log4j.spi.RootCategory;import org.apache.log4j.xml.DOMConfigurator;/** An implementation of the Log4j RepositorySelector that looks for chapter * example local log4j.xml files * @author Scott.Stark@jboss.org * @version $Revision: 1.1 $ */public class ChapterExRepository implements RepositorySelector{   private static RepositorySelector theSelector;   private static Object guard = new Object();   private Hierarchy heirarchy;   public static synchronized void init(Class mainClass)   {      if( theSelector == null )      {         String name = mainClass.getName();         Hierarchy heirarchy = new Hierarchy(new RootCategory(Level.DEBUG));         // Locate the log4j.xml or log4j.properties config         InputStream is = findConfig(name, heirarchy);         if( is == null )            throw new IllegalStateException("Failed to find any log4j.xml config");         DOMConfigurator config = new DOMConfigurator();         config.doConfigure(is, heirarchy);         theSelector = new ChapterExRepository(heirarchy);         // Establish the RepositorySelector         LogManager.setRepositorySelector(theSelector, guard);      }   }   private ChapterExRepository(Hierarchy heirarchy)   {      this.heirarchy = heirarchy;   }   public LoggerRepository getLoggerRepository()   {      return heirarchy;   }   private static InputStream findConfig(String name, Hierarchy heirarchy)   {      ClassLoader tcl = Thread.currentThread().getContextClassLoader();      InputStream is = null;      // First look for a resource: "name / log4j-suffix(name).xml"      String prefix = "";      String suffix = name;      int dot = name.lastIndexOf('.');      if( dot >= 0 )      {         prefix = name.substring(0, dot);         suffix = name.substring(dot+1);      }      prefix = prefix.replace('.', '/');      String log4jxml = prefix + "/log4j-" + suffix + ".xml";      URL resURL = tcl.getResource(log4jxml);      if( resURL != null )      {         try         {            is = resURL.openStream();            System.out.println("Found resURL: "+resURL);            return is;         }         catch(IOException e)         {         }      }      // Next look for resource name / + log4j.xml      log4jxml = prefix + "/log4j.xml";      resURL = tcl.getResource(log4jxml);      if( resURL != null )      {         try         {            is = resURL.openStream();         }         catch(IOException e)         {         }         //System.out.println("Found resURL: "+resURL);         return is;      }      // Next look for just the log4j.xml res      log4jxml = "log4j.xml";      resURL = tcl.getResource(log4jxml);      if( resURL != null )      {         try         {            is = resURL.openStream();            //System.out.println("Found resURL: "+resURL);         }         catch(IOException e)         {         }      }      return is;   }}