package org.lcsim.detector;
   
   public class PhysicalVolumeStore 
   extends PhysicalVolumeContainer
   implements IPhysicalVolumeStore
   {
   	private static IPhysicalVolumeStore store;
   	public static IPhysicalVolumeStore getInstance()
   	{
  		if ( store == null )
  		{
  			store = new PhysicalVolumeStore();
  		}
  		return store;
  	}
  	public PhysicalVolumeStore()
  	{
  		// Disallow duplicate physical volumes to be 
  		// added but globally non-unique name and
  		// copyNum is okay.
  		super(true,false,false);
  	}
      
      public String toString()
      {
          StringBuffer buff = new StringBuffer();
          for (IPhysicalVolume pv : this)
          {
              buff.append(pv.getName() + '\n');
          }
          return buff.toString();
      }
  }