content: //    HelloIoT is a dashboard creator for MQTT
  //    Copyright (C) 2017 Adrián Romero Corchado.
  //
  //    This file is part of HelloIot.
  //
  //    HelloIot 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 3 of the License, or
  //    (at your option) any later version.
  //
  //    HelloIot 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.  See the
  //    GNU General Public License for more details.
  //
  //    You should have received a copy of the GNU General Public License
  //    along with HelloIot.  If not, see <http://www.gnu.org/licenses/>.
  //
  package com.adr.helloiot.scripting;
  
  import java.util.Map;
  import javax.script.ScriptContext;
  import javax.script.ScriptEngine;
  import javax.script.ScriptEngineManager;
  import javax.script.ScriptException;
  
  /**
   *
   * @author adrian
   */
  public class Nashorn extends Script {
  
      private static final ScriptEngineManager SCRIPTMANAGER = new ScriptEngineManager();
      
      private final ScriptEngine scriptengine = SCRIPTMANAGER.getEngineByName("javascript");
      
      @Override
      public void putScopeObject(String name, Object obj) throws ScriptExecException {
          scriptengine.put(name, obj);
      }   
      
      @Override
      public void putScopeFunction(String name, Object obj, String method, int params) throws ScriptExecException {
          try {         
              scriptengine.put("__" + name, obj);
              scriptengine.eval("function " + name + "(" + createArgs(params) + ") {return __" + name +"." + method + "(" + createArgs(params) + ");}");
          } catch (ScriptException ex) {
              throw new ScriptExecException(ex);
          }
      }
      
      @Override
      public void putScopeMap(Map<String, Object> params) throws ScriptExecException {
          scriptengine.getBindings(ScriptContext.ENGINE_SCOPE).putAll(params);
      }
      
      @Override
      public Object exec(String script) throws ScriptExecException {
          try {
              return scriptengine.eval(script);
          } catch (ScriptException ex) {
              throw new ScriptExecException(ex);
          }
      } 
  }
  