Using Java with Other Languages - Java - page 966

public public Object getParameter ( String key ) {

switch

switch ( key ) {
case

case ScriptEngine . ENGINE :
return

return getEngineName ();

case case ScriptEngine . ENGINE_VERSION :

return return getEngineVersion ();

case case ScriptEngine . LANGUAGE :

return return getLanguageName ();

case case ScriptEngine . LANGUAGE_VERSION :

return

return getLanguageVersion ();
default

default :
throw

throw new new IllegalArgumentException ( "Unknown parameter " + key );

}

}

@Override
public public String getMethodCallSyntax ( String obj , String m , String ... args ) {

// TODO Auto-generated method stub
return

return null null ;

}

@Override
public public String getOutputStatement ( String toDisplay ) {

return return toDisplay ;

}

@Override
public

public String getProgram ( String ... statements ) {
return return statements . toString ();

}

@Override
public public ScriptEngine getScriptEngine () {

return

return new new CalcScriptEngine ( this this );

}

}

Finally, a configuration file is required. This file must be named exactly
javax.script.ScriptEngineFactory and must be located precisely in the META-INF/services
directory of the same classpath element as your JAR files. This file must contain exactly one
line with just the full name of your factory class. For example:

otherlang.calcscriptengine.CalcScriptEngineFactory