package org.lcsim.geometry.layer;
   
   import org.jdom.Element;
   import org.jdom.JDOMException;
   
   /**
    * Provides access to layering information in a subdetector.
    * 
    * @author Jeremy McCormick <jeremym@slac.stanford.edu>
   */
  public class Layering 
  {    
      protected LayerStack layerStack;
      protected double offset = 0;
      
      public static Layering makeLayering(Element e) throws JDOMException
      {
          return new Layering(e);
      }
      
      /** 
       * @param e The XML element representing the subdetector in the compact format.
       */
      public Layering(Element e) throws JDOMException
      {        
          // Create the LayerStack using static conversion function.
          layerStack = LayerFromCompactCnv.makeLayerStackFromCompact(e);
      }
      
      public Layering(LayerStack s)
      {
      	layerStack = s;
      }
      
      public double getDistanceToLayer(int layer)
      {
          return getLayerStack().getThicknessToLayerFront(layer) + offset;
      }
      
      public double getDistanceToLayerBack(int layer)
      {
      	return getLayerStack().getThicknessToLayerBack(layer) + offset;
      }
      
      /** alias to getLayerStack() */
      public LayerStack getLayers()
      {
          return getLayerStack();
      }
  
      public Layer getLayer(int i)
      {
          return getLayerStack().getLayer(i);
      }
      
      public double getThickness()
      {
          return getLayerStack().getTotalThickness();
      }
      
      public LayerStack getLayerStack()
      {
          return layerStack;
      }
      
      public int getLayerCount()
      {
          return getLayerStack().getNumberOfLayers();
      }       
      
      public int getNumberOfLayers()
      {
          return getLayerCount();
      }
      
      public int size()
      {
          return getLayerCount();
      }
      
      public double getDistanceToLayerSensorMid(int layer)
      {
          return getDistanceToLayer(layer) + 
                 getLayerStack().getLayer(layer).getThicknessToSensitiveMid();
      }
      
      public double getDistanceToLayerSensorFront(int layer)
      {
      	return getDistanceToLayer(layer) + getLayerStack().getLayer(layer).getThicknessToSensitive();
      }
      
      public double getDistanceToLayerSensorBack(int layer)
      {    	
      	return getDistanceToLayerSensorFront(layer) + getLayer(layer).getSensorThickness();
      }
              
      public void setOffset(double o)
      {
          offset = o;
     }
     
     public double getOffset()
     {
         return offset;
     }
 }