package org.lcsim.plugin.conditions;
   
   import hep.graphics.heprep.HepRep;
   import hep.graphics.heprep.HepRepFactory;
   import hep.graphics.heprep.HepRepInstanceTree;
   import hep.graphics.heprep.HepRepTypeTree;
   import hep.physics.vec.BasicHep3Vector;
   import hep.physics.vec.Hep3Vector;
   import java.util.List;
  import org.lcsim.geometry.FieldMap;
  import org.lcsim.util.loop.DummyDetector;
  
  /**
   * A "dummy" detector which is only able to provide HepRep's for WIRED for
   * when no other geometry is available.
   * @author tonyj
   */
  class HepRepOnlyDetector extends DummyDetector
  {
     private HepRep detector;
     private FieldMap field;
     /** Creates a new instance of HeprepOnlyDetector */
     HepRepOnlyDetector(String name, HepRep heprep, double field)
     {
        super(name);
        this.detector = heprep;
        this.field = new SolenoidalField(field);
     }
     
     public void appendHepRep(HepRepFactory factory, HepRep heprep)
     {
        List<HepRepTypeTree> types = detector.getTypeTreeList();
        for (HepRepTypeTree gTypeTree : types) heprep.addTypeTree(gTypeTree);
        
        List<HepRepInstanceTree> instances = detector.getInstanceTreeList();
        for (HepRepInstanceTree gInstanceTree : instances) heprep.addInstanceTree(gInstanceTree);
        
        List<String> layers = detector.getLayerOrder();
        for (String layer : layers ) heprep.addLayer(layer);
     }
     
     public FieldMap getFieldMap()
     {
        return field;
     }
     
     private class SolenoidalField implements FieldMap
     {
        private double[] field;
        SolenoidalField(double zField)
        {
           field = new double[]{0,0,zField};
        }
        public void getField(double[] position, double[] b)
        {
           for (int i=0;i<3;i++) b[i] = field[1];
        }
        
        public double[] getField(double[] position)
        {
           return field;
        }
        
        public Hep3Vector getField(Hep3Vector position, BasicHep3Vector field)
        {
           if (field == null) field = new BasicHep3Vector();
           getField(position.v(),field.v());
           return field;
        }
        
        public Hep3Vector getField(Hep3Vector position)
        {
           return getField(position,null);
        }
     }
  }