package lava.net.common;

import java.net.InetAddress;

/**
 * UNL:
 *   Description of the logical Name of an Object.
 *   Format is similar to URL.
 *   Scheme-Name is psyc://
 *   Objects might be Servers, Groups, Users, Services.
 *   Servers:  resource=null
 *   Groups:   resource begins with '@'
 *   Users:    resource begins with '~'
 *   Services: resource begins with '$'
 *   Every Object only can have one UNL.
 **/
public class UNL extends UNA 
{
   /**
    *
    **/
   private String context = null;

   /**
    *
    **/
   private UNL withoutContext = null;

   /**
    *
    **/
   private int hashCode = -1;

   /**
    *
    **/
   public UNL()
   {
      super();
   }

   /**
    *
    **/
   public UNL(String spec)
   {
      super(spec);
   }

   /**
    *
    **/
   public UNL(UNL base, String spec)
   {
      super(base,spec);
   }

   /**
    *
    **/
   public UNL(String scheme, String host, int port, String protocol, //
   String resource)
   {
      super(scheme,host,port,protocol,resource);
   }

   /**
    *
    **/
   private UNL(String scheme, String host, int port, String protocol, //
   String resource, String context, UNL orig)
   {
      super(scheme,host,port,protocol,resource);
      this.context = context;
      if(orig != null)
         while(orig.withoutContext != null)
            orig = orig.withoutContext;
      withoutContext = orig;
   }

   /**
    *
    **/
   public UNL(String scheme, InetAddress host, int port, String protocol, //
   String resource)
   {
      super(scheme,host,port,protocol,resource);
   }

   /**
    *
    **/
   public UNL(UNA addr)
   {
      super(addr.getScheme(),addr.getHostName(),addr.getPort(),//
      addr.getProtocol(),addr.getResource());
   }

   /**
    *
    **/
   public UNL addContext(String context)
   {
      return new UNL(getScheme(),getHostName(),getPort(),//
      getProtocol(),getResource(),context,this);
   }

   /**
    *
    **/
   public UNL withoutContext()
   {
      return withoutContext != null ? withoutContext : this;
   }

   /**
    *
    **/
   public String getContext()
   {
      return context;
   }

   /**
    *
    **/
   public boolean equalsInContext(UNL other)
   {
      if(other == null)
         return false;
      return (context == null || other.context == null ? //
      context == null && other.context == null : //
      context.equals(other.context));
   }

   /**
    *
    **/
   public boolean equals(Object obj)
   {
      return (obj instanceof UNL) && //
      super.equals(obj) && //
      equalsInContext((UNL)obj);
   }

   /**
    *
    **/
   public int hashCode()
   {
      if(hashCode == -1)
      {
         hashCode = super.hashCode() ^ //
         (context == null ? 0 : context.hashCode());
      }
      return hashCode;
   }

}