package votorola.g.script; // Copyright 2008, Michael Allan.  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Votorola Software"), to deal in the Votorola Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Votorola Software, and to permit persons to whom the Votorola Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Votorola Software. THE VOTOROLA SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE VOTOROLA SOFTWARE OR THE USE OR OTHER DEALINGS IN THE VOTOROLA SOFTWARE.

import java.io.*;
import javax.script.*;
import votorola.g.lang.*;


/** Script engine utilities.
  */
public @ThreadSafe final class ScriptEngineX
{


    private ScriptEngineX() {}



    /** Same as engine.{@linkplain ScriptEngine#eval(String) eval}(script),
      * except that the source of the script is provided as a file.
      *
      *     @param file script file, encoded in UTF-8
      *     @return the value returned by the script
      */
    public static Object eval( final File file, final ScriptEngine engine )
      throws IOException, ScriptException
    {
        final BufferedReader reader = new BufferedReader( new InputStreamReader(
          new FileInputStream( file ), "UTF-8" ));
        try
        {
            engine.put( ScriptEngine.FILENAME, file.getPath() ); // for nicer error messages
            return engine.eval( reader );
        }
        finally{ reader.close(); }
    }



    /** Same as engine.{@linkplain ScriptEngine#eval(String) eval}(script),
      * except that the source of the script is provided as a file path.
      *
      *     @param path to UTF-8 encoded script file
      *       (without any shell variable, or tilde ~ in the path string)
      *     @return the value returned by the script
      */
    public static Object eval( String path, ScriptEngine engine )
      throws IOException, ScriptException
    {
        return eval( new File(path), engine );
    }



}