/*
 * Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.quercus.env;

import com.caucho.quercus.QuercusException;
import com.caucho.quercus.annotation.Name;
import com.caucho.quercus.module.ModuleContext;
import com.caucho.util.L10N;

import java.lang.reflect.*;

/**
 * Represents the introspected static function information.
 */
public class JavaConstructor extends JavaInvoker {
  private static final L10N L = new L10N(JavaConstructor.class);
  
  private final Constructor _constructor;
  private final int _argLength;

  /**
   * Creates the statically introspected function.
   *
   * @param method the introspected method.
   */
  public JavaConstructor(ModuleContext moduleContext,
                         Constructor cons)
  {    
    super(moduleContext,
          getName(cons),
          cons.getParameterTypes(),
          cons.getParameterAnnotations(),
          cons.getAnnotations(),
          cons.getDeclaringClass());

    _constructor = cons;
    _argLength = cons.getParameterTypes().length;
  }
  
  @Override
  public String getDeclaringClassName()
  {
    return getName();
  }

  private static String getName(Constructor<?> cons)
  {
    String name;

    Name nameAnn = (Name) cons.getAnnotation(Name.class);

    if (nameAnn != null)
      name = nameAnn.value();
    else {
      Class<?> cl = cons.getDeclaringClass();
      Name clNameAnn =  (Name) cl.getAnnotation(Name.class);

      if (clNameAnn != null)
        name = nameAnn.value();
      else
        name = cl.getSimpleName();
    }

    return name;
  }
  
  @Override
  public boolean isConstructor()
  {
    return true;
  }

  public int getArgumentLength()
  {
    return _argLength;
  }

  public Object invoke(Object obj, Object []args)
  {
    try {
      obj = _constructor.newInstance(args);
      
      return obj;
    } catch (RuntimeException e) {
      throw e;
    } catch (InvocationTargetException e) {
      if (e.getCause() instanceof RuntimeException)
        throw (RuntimeException) e.getCause();
      else
        throw new QuercusException(e.getCause());
    } catch (Exception e) {
      throw new QuercusException(e);
    }
  }
}