/*
 * 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 "Hessian", "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.services.server;

import java.io.InputStream;

import java.util.HashMap;

import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;

/**
 * Proxy class for Hessian services.
 */
abstract public class AbstractSkeleton {
  private Class _apiClass;
  private Class _homeClass;
  private Class _objectClass;
  
  private HashMap _methodMap = new HashMap();

  /**
   * Create a new hessian skeleton.
   *
   * @param apiClass the API interface
   */
  protected AbstractSkeleton(Class apiClass)
  {
    _apiClass = apiClass;
    
    Method []methodList = apiClass.getMethods();

    for (int i = 0; i < methodList.length; i++) {
      Method method = methodList[i];

      if (_methodMap.get(method.getName()) == null)
        _methodMap.put(method.getName(), methodList[i]);

      Class []param = method.getParameterTypes();
      String mangledName = method.getName() + "__" + param.length;
      _methodMap.put(mangledName, methodList[i]);
      
      _methodMap.put(mangleName(method, false), methodList[i]);
    }
  }

  /**
   * Returns the API class of the current object.
   */
  public String getAPIClassName()
  {
    return _apiClass.getName();
  }

  /**
   * Returns the API class of the factory/home.
   */
  public String getHomeClassName()
  {
    if (_homeClass != null)
      return _homeClass.getName();
    else
      return getAPIClassName();
  }

  /**
   * Sets the home API class.
   */
  public void setHomeClass(Class homeAPI)
  {
    _homeClass = homeAPI;
  }

  /**
   * Returns the API class of the object URLs
   */
  public String getObjectClassName()
  {
    if (_objectClass != null)
      return _objectClass.getName();
    else
      return getAPIClassName();
  }

  /**
   * Sets the object API class.
   */
  public void setObjectClass(Class objectAPI)
  {
    _objectClass = objectAPI;
  }

  /**
   * Returns the method by the mangled name.
   *
   * @param mangledName the name passed by the protocol
   */
  protected Method getMethod(String mangledName)
  {
    return (Method) _methodMap.get(mangledName);
  }

  /**
   * Creates a unique mangled method name based on the method name and
   * the method parameters.
   *
   * @param method the method to mangle
   * @param isFull if true, mangle the full classname
   *
   * @return a mangled string.
   */
  private String mangleName(Method method, boolean isFull)
  {
    StringBuffer sb = new StringBuffer();
    
    sb.append(method.getName());
    
    Class []params = method.getParameterTypes();
    for (int i = 0; i < params.length; i++) {
      sb.append('_');
      mangleClass(sb, params[i], isFull);
    }

    return sb.toString();
  }

  /**
   * Mangles a classname.
   */
  private void mangleClass(StringBuffer sb, Class cl, boolean isFull)
  {
    String name = cl.getName();

    if (name.equals("boolean") || name.equals("java.lang.Boolean"))
      sb.append("boolean");
    else if (name.equals("int") || name.equals("java.lang.Integer") ||
             name.equals("short") || name.equals("java.lang.Short") ||
             name.equals("byte") || name.equals("java.lang.Byte"))
      sb.append("int");
    else if (name.equals("long") || name.equals("java.lang.Long"))
      sb.append("long");
    else if (name.equals("float") || name.equals("java.lang.Float") ||
	     name.equals("double") || name.equals("java.lang.Double"))
      sb.append("double");
    else if (name.equals("java.lang.String") ||
             name.equals("com.caucho.util.CharBuffer") ||
             name.equals("char") || name.equals("java.lang.Character") ||
             name.equals("java.io.Reader"))
      sb.append("string");
    else if (name.equals("java.util.Date") ||
             name.equals("com.caucho.util.QDate"))
      sb.append("date");
    else if (InputStream.class.isAssignableFrom(cl) ||
             name.equals("[B"))
      sb.append("binary");
    else if (cl.isArray()) {
      sb.append("[");
      mangleClass(sb, cl.getComponentType(), isFull);
    }
    else if (name.equals("org.w3c.dom.Node") ||
             name.equals("org.w3c.dom.Element") ||
             name.equals("org.w3c.dom.Document"))
      sb.append("xml");
    else if (isFull)
      sb.append(name);
    else {
      int p = name.lastIndexOf('.');
      if (p > 0)
        sb.append(name.substring(p + 1));
      else
        sb.append(name);
    }
  }
}
