Expressions

import ilog.views.sdm.renderer.IlvSDMCSSFunction;
import.ilog.views.sdm.IlvSDMEngine;

public class Average extends IlvSDMCSSFunction {
   //default constructor
   public Average() { }

   // Returns 'avrg'
   public String getName() {
      return "avrg";
   }

   // Returns ','
   public String getDelimiters() {
      return ",";
   }

   // Returns the average of arguments.
   public Object call(Object[] args, Class type, IlvSDMEngine engine,
                      Object node, Object target) {
      // Assume only double, for the sake of simplicity.
      double result = 0d;
      for (int i=0; i<args.length; i++) {
         if (args[i] != null) {
            result += Double.parseDouble(args[i].toString());
         }
      }
      result /= args.length;
      return new Double(result);
   }
}

node {
   width : @|avrg(@param1,@param2);
}

class SDMGetGraphic extends IlvSDMCSSFunction {

   public SDMGetGraphic() {
   }

   public String getName() {
     return "getGraphicFromId";
   }

   public Object call(Object[] args, Class type, IlvSDMEngine engine,
                      Object node, Object target) {

     if (args.length < 1)
       throw new IllegalArgumentException("getGraphicFrom Id needs an id");

     String id = (String)args[0];
     IlvSDMModel model = engine.getModel();
     Object ref = model.getObject(id);
     if (ref == null)
       return null;
     IlvGraphic graphic = engine.getGraphic(ref,true);
     return graphic;

   }

   public Feedback[] invert(Object[] args, Object value,
                            IlvSDMEngine engine,
                            Object node) {

     return null;
   }
}

   graphic : @|getGraphicFromId(@__ID) ;

StyleSheet {
   functionList : "myPackage.RevertFunction,tests.RandomFunction";
}

public Feedback[] invert(Object[] args, Object value, IlvSDMEngine engine,
                         Object target) {
   ArrayList result = new ArrayList();
   //The simplest to do is to set all attributes to the same final value.
   for (int i=0; i<args.length; i++) {
      // assume there is only @ construct.
      String att = args[i].toString();
      // Skip ’@’, which is the first character.
      att = att.substring(1);
      //Create and fill Feedback structure.
      Feedback f = new IlvSDMCSSFunction.Feedback();
      f.property = att;
      f.value = value;
      // Record feedback.
      result.add(f);
   }
   // Convert to Feedback[].
   return result.toArray(new IlvSDMCSSFunction.Feedback[result.size()]);
}