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A reactive Java web server.
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/*
 * Copyright (c) 1998-2015 Caucho Technology -- all rights reserved
 *
 * This file is part of Baratine(TM)(TM)
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Baratine 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.
 *
 * Baratine 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 Baratine; 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.v5.config.expr;

import java.lang.reflect.Method;
import java.util.function.Function;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * String literal expression
 */
public class ExprCfgMethod implements ExprCfg
{
  private static final Logger log = Logger.getLogger(ExprCfgMethod.class.getName());
  
  private final ExprCfg _left;
  private final ExprCfg []_args;
  
  ExprCfgMethod(ExprCfg left, ExprCfg []args)
  {
    _left = left;
    _args = args;
  }
  
  @Override
  public Object eval(Function env)
  {
    Object value = _left.eval(env);
    
    if (value == null) {
      return null;
    }
    
    if (! (value instanceof Method)) {
      System.out.println("UNEXP-METHOD: " + value);
      return null;
    }
    
    try {
      Method method = (Method) value;
      
      // method = findMethod(value.getClass(), _methodName);

      /*
      if (method == null) {
        return method;
      }
      */
      
      Class []param = method.getParameterTypes();
      Object []args = new Object[param.length];
      
      int sublen = Math.min(args.length, _args.length);
      
      for (int i = 0; i < sublen; i++) {
        args[i] = _args[i].eval(env);
      }
      
      return method.invoke(value, args);
    } catch (Exception e) {
      log.log(Level.FINEST, e.toString(), e);
      
      return null;
    }
  }
  
  private Method findMethod(Class cl, String methodName)
  {
    for (Method method : cl.getMethods()) {
      if (method.getName().equals(methodName)) {
        return method;
      }
    }
    
    return null;
  }
  
  @Override
  public ExprCfg createField(String name)
  {
    return new ExprCfgField(this, name);
  }
}