//
   //  ========================================================================
   //  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.util;
  
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  
  public class DeprecationWarning implements Decorator
  {
      private static final Logger LOG = Log.getLogger(DeprecationWarning.class);
  
      @Override
      public <T> T decorate(T o)
      {
          if (o == null)
          {
              return null;
          }
  
          Class<?> clazz = o.getClass();
  
          try
          {
              Deprecated depr = clazz.getAnnotation(Deprecated.class);
              if (depr != null)
              {
                  LOG.warn("Using @Deprecated Class {}",clazz.getName());
              }
          }
          catch (Throwable t)
          {
              LOG.ignore(t);
          }
  
          verifyIndirectTypes(clazz.getSuperclass(),clazz,"Class");
          for (Class<?> ifaceClazz : clazz.getInterfaces())
          {
              verifyIndirectTypes(ifaceClazz,clazz,"Interface");
          }
  
          return o;
      }
  
      private void verifyIndirectTypes(Class<?> superClazz, Class<?> clazz, String typeName)
      {
          try
          {
              // Report on super class deprecation too
              while (superClazz != null && superClazz != Object.class)
              {
                  Deprecated supDepr = superClazz.getAnnotation(Deprecated.class);
                  if (supDepr != null)
                  {
                      LOG.warn("Using indirect @Deprecated {} {} - (seen from {})",typeName,superClazz.getName(),clazz);
                  }
  
                  superClazz = superClazz.getSuperclass();
              }
          }
          catch (Throwable t)
          {
              LOG.ignore(t);
          }
      }
  
      @Override
      public void destroy(Object o)
      {
      }
  }