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/**
 * OW2 FraSCAti: SCA Implementation Script
 * Copyright (C) 2009-2010 INRIA, USTL
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Contact: [email protected] 
 *
 * Author: Philippe Merle
 * Contributor(s):
 */

package org.ow2.frascati.implementation.script;

import javax.script.ScriptEngine;

import org.objectweb.fractal.api.Component;
import org.objectweb.fractal.api.NoSuchInterfaceException;
import org.objectweb.fractal.api.control.IllegalLifeCycleException;
import org.objectweb.fractal.api.control.LifeCycleController;
import org.ow2.frascati.tinfi.api.control.SCAPropertyController;
import org.ow2.frascati.util.AbstractLoggeable;

/**
 * Implementation of a scripting engine component.
 * 
 * @author Philippe Merle
 */
public class ScriptEngineComponent
     extends AbstractLoggeable
  implements ScriptEngineAttributes, LifeCycleController {

  /**
   * The enclosing SCA component implemented by the script.
   */
//  private Component scaComponent;

  /**
   * The SCA property controller of the enclosing SCA component.
   */
  private SCAPropertyController scaPropertyController;

  /**
   * The scripting engine executing the script.
   */
  private ScriptEngine scriptEngine;

  /**
   * The state of this Fractal component.
   */
  private String fcState;

  /**
   * Constructor.
   *
   * @param scaComponent the enclosing SCA component implemented by the script.
   * @param scriptEngine the scripting engine executing the script.
   */
  public ScriptEngineComponent(Component scaComponent, ScriptEngine scriptEngine) {
//    this.scaComponent = scaComponent;
    this.scriptEngine = scriptEngine;

    // Obtain the SCA property controller of the enclosing SCA component.
    try {
        scaPropertyController = (SCAPropertyController) scaComponent
	        .getFcInterface("sca-property-controller");
    } catch(NoSuchInterfaceException nsie) {
    	// Must never happen!!!
        throw new Error("Internal FraSCAti error!", nsie);
    }
  }

  /**
   * @see ScriptingEngineAttributes.getLanguage()
   */
  public final String getLanguage() {
	  return null; // TODO
  }

  /**
   * @see ScriptingEngineAttributes.getScript()
   */
  public final String getScript() {
	  return null; // TODO
  }

  /**
   * @see ScriptingEngineAttributes.setScript(String)
   */
  public final void setScript(String script) {
    // TODO
  }

  /**
   * @see org.objectweb.fractal.api.control.LifeCycleController#getFcState()
   */
  public final String getFcState() {
    return this.fcState;
  }

  /**
   * @see org.objectweb.fractal.api.control.LifeCycleController#startFc()
   */
  public final void startFc() throws IllegalLifeCycleException {
    log.finer("ScriptEngineComponent starting...");

    // When this component is started then it obtains all the properties of its enclosing SCA component
    // and put them as variables in the scripting engine.
    String [] properties = scaPropertyController.getPropertyNames();
    for (String property : properties) {
      Object value = scaPropertyController.getValue(property);
      log.info("Affect the scripting variable '" + property + "' with the value '" + value + "'");
      scriptEngine.put(property, value);
    }

    this.fcState = LifeCycleController.STARTED;
    log.finer("ScriptEngineComponent started.");
  }

  /**
   * @see org.objectweb.fractal.api.control.LifeCycleController#stopFc()
   */
  public final void stopFc() throws IllegalLifeCycleException {
    this.fcState = LifeCycleController.STOPPED;
    log.finer("ScriptEngineComponent stopped.");
  }

}