package org.lcsim.geometry;
   
   import java.io.IOException;
   import java.io.InputStream;
   
   import org.jdom.JDOMException;
   import org.lcsim.detector.converter.compact.DetectorConverter;
   import org.lcsim.geometry.compact.CompactElementFactory;
   import org.lcsim.geometry.compact.CompactReader;
  import org.lcsim.geometry.compact.Field;
  import org.lcsim.geometry.compact.Segmentation;
  import org.lcsim.geometry.compact.Subdetector;
  import org.lcsim.util.xml.ElementFactory.ElementCreationException;
  import org.lcsim.detector.DetectorStore;
  
  /**
   * The GeometryReader extends the CompactReader and creates specific types based on the type attribute of an XML
   * element. The type string must match a class within the registered package for that base class. Currently supported
   * base classes with specific types are Subdetector, Segmentation, and Field.
   * <p>
   * For example, this compact XML will instantiate a Subdetector with specific type of 'CylindricalBarrelCalorimeter'.<br/> 
   * <pre>
   * <detector type="CylindricalBarrelCalorimeter" ... /> Support added for detailed geometry representation.
   * </pre>
   * 
   * @author Tony Johnson, SLAC
   * @author Jeremy McCormick, SLAC
   */
  public class GeometryReader extends CompactReader {
  
      boolean buildDetailed = true;
  
      public GeometryReader() {
          super(new GeometryFactory());
      }
  
      public Detector read(InputStream in) throws IOException, JDOMException, ElementCreationException {
          
          // Build a compact description with support for specific types.
          Detector detector = (Detector) super.read(in);
  
          // Clear existing detector store.
          DetectorStore.getInstance().clear();
  
          // Build the detailed detector description.
          if (buildDetailed) {
              DetectorConverter cnv = new DetectorConverter();
              cnv.registerSubdetectorConverters();
              cnv.convert(detector, getDocument());
          }
  
          // Clear the cached document.
          resetDocument();
  
          return detector;
      }
  
      public boolean buildDetailed() {
          return buildDetailed;
      }
  
      public void setBuildDetailed(boolean buildDetailed) {
          this.buildDetailed = buildDetailed;
      }
  
      static class GeometryFactory extends CompactElementFactory {
          GeometryFactory() {
              super();
              register(Detector.class);
              register(Subdetector.class, "org.lcsim.geometry.subdetector");
              register(Segmentation.class, "org.lcsim.geometry.segmentation");
              register(Field.class, "org.lcsim.geometry.field");
          }
      }
  }