content: /*
   * Copyright (c) 2001-2004 Caucho Technology, Inc.  All rights reserved.
   *
   * The Apache Software License, Version 1.1
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:
   *       "This product includes software developed by the
   *        Caucho Technology (http://www.caucho.com/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "Burlap", "Resin", and "Caucho" must not be used to
   *    endorse or promote products derived from this software without prior
   *    written permission. For written permission, please contact
   *    info@caucho.com.
   *
   * 5. Products derived from this software may not be called "Resin"
   *    nor may "Resin" appear in their names without prior written
   *    permission of Caucho Technology.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL CAUCHO TECHNOLOGY OR ITS CONTRIBUTORS
   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
   * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
   * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
   * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
   * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * @author Scott Ferguson
   */
  
  package com.caucho.hessian.io;
  
  import java.io.IOException;
  import java.lang.reflect.Method;
  import java.lang.reflect.Modifier;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.Locale;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  /**
   * Serializing an object for known object types.
   */
  public class BeanSerializer extends AbstractSerializer {
    private static final Logger log
      = Logger.getLogger(BeanSerializer.class.getName());
    
    private static final Object []NULL_ARGS = new Object[0];
    private Method []_methods;
    private String []_names;
  
    private Object _writeReplaceFactory;
    private Method _writeReplace;
    
    public BeanSerializer(Class<?> cl, ClassLoader loader)
    {
      introspectWriteReplace(cl, loader);
  
      ArrayList<Method> primitiveMethods = new ArrayList<Method>();
      ArrayList compoundMethods = new ArrayList();
      
      for (; cl != null; cl = cl.getSuperclass()) {
        Method []methods = cl.getDeclaredMethods();
        
        for (int i = 0; i < methods.length; i++) {
          Method method = methods[i];
  
          if (Modifier.isStatic(method.getModifiers()))
            continue;
  
          if (method.getParameterTypes().length != 0)
            continue;
  
          String name = method.getName();
  
          if (! name.startsWith("get"))
            continue;
  
          Class type = method.getReturnType();
  
          if (type.equals(void.class))
            continue;
  
          if (findSetter(methods, name, type) == null)
            continue;
  
          // XXX: could parameterize the handler to only deal with public
          method.setAccessible(true);
  
          if (type.isPrimitive()
              || type.getName().startsWith("java.lang.")
              && ! type.equals(Object.class))
            primitiveMethods.add(method);
          else
            compoundMethods.add(method);
        }
      }
  
      ArrayList methodList = new ArrayList();
      methodList.addAll(primitiveMethods);
      methodList.addAll(compoundMethods);
  
      Collections.sort(methodList, new MethodNameCmp());
  
      _methods = new Method[methodList.size()];
      methodList.toArray(_methods);
  
      _names = new String[_methods.length];
      
      for (int i = 0; i < _methods.length; i++) {
        String name = _methods[i].getName();
  
        name = name.substring(3);
  
        int j = 0;
        for (; j < name.length() && Character.isUpperCase(name.charAt(j)); j++) {
        }
  
        if (j == 1)
          name = name.substring(0, j).toLowerCase(Locale.ENGLISH) + name.substring(j);
        else if (j > 1)
          name = name.substring(0, j - 1).toLowerCase(Locale.ENGLISH) + name.substring(j - 1);
  
        _names[i] = name;
      }
    }
  
    private void introspectWriteReplace(Class cl, ClassLoader loader)
    {
      try {
        String className = cl.getName() + "HessianSerializer";
  
        Class serializerClass = Class.forName(className, false, loader);
  
        Object serializerObject = serializerClass.newInstance();
  
        Method writeReplace = getWriteReplace(serializerClass, cl);
  
        if (writeReplace != null) {
          _writeReplaceFactory = serializerObject;
          _writeReplace = writeReplace;
  
          return;
        }
      } catch (ClassNotFoundException e) {
      } catch (Exception e) {
        log.log(Level.FINER, e.toString(), e);
      }
        
      _writeReplace = getWriteReplace(cl);
    }
  
    /**
     * Returns the writeReplace method
     */
    protected Method getWriteReplace(Class cl)
    {
      for (; cl != null; cl = cl.getSuperclass()) {
        Method []methods = cl.getDeclaredMethods();
        
        for (int i = 0; i < methods.length; i++) {
          Method method = methods[i];
  
          if (method.getName().equals("writeReplace") &&
              method.getParameterTypes().length == 0)
            return method;
        }
      }
  
      return null;
    }
  
    /**
     * Returns the writeReplace method
     */
    protected Method getWriteReplace(Class cl, Class param)
    {
      for (; cl != null; cl = cl.getSuperclass()) {
        for (Method method : cl.getDeclaredMethods()) {
          if (method.getName().equals("writeReplace")
              && method.getParameterTypes().length == 1
              && param.equals(method.getParameterTypes()[0]))
            return method;
        }
      }
  
      return null;
    }
    
    public void writeObject(Object obj, AbstractHessianOutput out)
      throws IOException
    {
      if (out.addRef(obj))
        return;
      
      Class cl = obj.getClass();
      
      try {
        if (_writeReplace != null) {
          Object repl;
  
          if (_writeReplaceFactory != null)
            repl = _writeReplace.invoke(_writeReplaceFactory, obj);
          else
            repl = _writeReplace.invoke(obj);
  
          // out.removeRef(obj);
  
          out.writeObject(repl);
  
          out.replaceRef(repl, obj);
  
          return;
        }
      } catch (Exception e) {
        log.log(Level.FINER, e.toString(), e);
      }
  
      int ref = out.writeObjectBegin(cl.getName());
  
      if (ref < -1) {
        // Hessian 1.1 uses a map
        
        for (int i = 0; i < _methods.length; i++) {
          Method method = _methods[i];
          Object value = null;
  
          try {
            value = _methods[i].invoke(obj, (Object []) null);
          } catch (Exception e) {
            log.log(Level.FINE, e.toString(), e);
          }
  
          out.writeString(_names[i]);
  
          out.writeObject(value);
        }
        
        out.writeMapEnd();
      }
      else {
        if (ref == -1) {
          out.writeInt(_names.length);
  
          for (int i = 0; i < _names.length; i++)
            out.writeString(_names[i]);
  
          out.writeObjectBegin(cl.getName());
        }
  
        for (int i = 0; i < _methods.length; i++) {
          Method method = _methods[i];
          Object value = null;
  
          try {
            value = _methods[i].invoke(obj, (Object []) null);
          } catch (Exception e) {
            log.log(Level.FINER, e.toString(), e);
          }
  
          out.writeObject(value);
        }
      }
    }
  
    /**
     * Finds any matching setter.
     */
    private Method findSetter(Method []methods, String getterName, Class arg)
    {
      String setterName = "set" + getterName.substring(3);
      
      for (int i = 0; i < methods.length; i++) {
        Method method = methods[i];
  
        if (! method.getName().equals(setterName))
          continue;
        
        if (! method.getReturnType().equals(void.class))
          continue;
  
        Class []params = method.getParameterTypes();
  
        if (params.length == 1 && params[0].equals(arg))
          return method;
      }
  
      return null;
    }
  
    static class MethodNameCmp implements Comparator<Method> {
      public int compare(Method a, Method b)
      {
        return a.getName().compareTo(b.getName());
      }
    }
  }
  