//
   //  ========================================================================
   //  Copyright (c) 1995-2013 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.ajax;
  
  import java.lang.reflect.Method;
  import java.lang.reflect.Modifier;
  import java.util.Arrays;
  import java.util.HashSet;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Set;
  
  import org.eclipse.jetty.util.ajax.JSON.Output;
  
  /* ------------------------------------------------------------ */
  /**
   * Convert an Object to JSON using reflection on getters methods.
   * 
   * 
   *
   */
  public class JSONObjectConvertor implements JSON.Convertor
  {
      private boolean _fromJSON;
      private Set _excluded=null;
  
      public JSONObjectConvertor()
      {
          _fromJSON=false;
      }
      
      public JSONObjectConvertor(boolean fromJSON)
      {
          _fromJSON=fromJSON;
      }
      
      /* ------------------------------------------------------------ */
      /**
       * @param fromJSON
       * @param excluded An array of field names to exclude from the conversion
       */
      public JSONObjectConvertor(boolean fromJSON,String[] excluded)
      {
          _fromJSON=fromJSON;
          if (excluded!=null)
              _excluded=new HashSet(Arrays.asList(excluded));
      }
  
      public Object fromJSON(Map map)
      {
          if (_fromJSON)
              throw new UnsupportedOperationException();
          return map;
      }
  
      public void toJSON(Object obj, Output out)
      {
          try
          {
              Class c=obj.getClass();
  
              if (_fromJSON)
                  out.addClass(obj.getClass());
  
              Method[] methods = obj.getClass().getMethods();
  
              for (int i=0;i<methods.length;i++)
              {
                  Method m=methods[i];
                  if (!Modifier.isStatic(m.getModifiers()) &&  
                          m.getParameterTypes().length==0 && 
                          m.getReturnType()!=null &&
                          m.getDeclaringClass()!=Object.class)
                  {
                      String name=m.getName();
                      if (name.startsWith("is"))
                          name=name.substring(2,3).toLowerCase(Locale.ENGLISH)+name.substring(3);
                      else if (name.startsWith("get"))
                          name=name.substring(3,4).toLowerCase(Locale.ENGLISH)+name.substring(4);
                      else
                          continue;
  
                      if (includeField(name,obj,m))
                         out.add(name, m.invoke(obj,(Object[])null));
                 }
             }
         } 
         catch (Throwable e)
         {
             throw new IllegalArgumentException(e);
         }
     }
     
     protected boolean includeField(String name, Object o, Method m)
     {
         return _excluded==null || !_excluded.contains(name);
     }
 
 }