content: /*
  * Conditions Of Use
  *
  * This software was developed by employees of the National Institute of
  * Standards and Technology (NIST), an agency of the Federal Government.
  * Pursuant to title 15 Untied States Code Section 105, works of NIST
  * employees are not subject to copyright protection in the United States
  * and are considered to be in the public domain.  As a result, a formal
  * license is not needed to use the software.
  *
  * This software is provided by NIST as a service and is expressly
  * provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
  * OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
  * AND DATA ACCURACY.  NIST does not warrant or make any representations
  * regarding the use of the software or the results thereof, including but
  * not limited to the correctness, accuracy, reliability or usefulness of
  * the software.
  *
  * Permission to use this software is contingent upon your acceptance
  * of the terms of this agreement
  *
  * .
  *
  */
  /*******************************************************************************
   * Product of NIST/ITL Advanced Networking Technologies Division (ANTD).        *
   *******************************************************************************/
  package gov2.nist.javax2.sip.stack;
  
  import java.io.Serializable;
  import java.util.StringTokenizer;
  /*
   * IPv6 Support added by Emil Ivov (emil_ivov@yahoo.com)<br/>
   * Network Research Team (http://www-r2.u-strasbg.fr))<br/>
   * Louis Pasteur University - Strasbourg - France<br/>
   * Bug fix for correct handling of IPV6 Address added by
   * Daniel J. Martinez Manzano <dani@dif.um.es>
   */
  /**
   * Routing algorithms return a list of hops to which the request is
   * routed.
   *
   * @version 1.2 $Revision: 1.11 $ $Date: 2009/07/17 18:58:13 $
   *
   * @author M. Ranganathan   <br/>
   *
   *
   *
  
   *
   */
  public final class HopImpl extends Object implements javax2.sip.address.Hop, Serializable {
      protected String host;
      protected int port;
      protected String transport;
  
      protected boolean defaultRoute; // This is generated from the proxy addr
      protected boolean uriRoute; // This is extracted from the requestURI.
  
      /**
       * Debugging println.
       */
      public String toString() {
          return host + ":" + port + "/" + transport;
      }
  
      /**
       * Create new hop given host, port and transport.
       * @param hostName hostname
       * @param portNumber port
       * @param trans transport
       */
      public HopImpl(String hostName, int portNumber, String trans) {
          host = hostName;
  
          // Added by Daniel J. Martinez Manzano <dani@dif.um.es>
          // for correct management of IPv6 addresses.
          if(host.indexOf(":") >= 0)
              if(host.indexOf("[") < 0)
                  host = "[" + host + "]";
  
          port = portNumber;
          transport = trans;
      }
  
  
      /**
       * Creates new Hop
       * @param hop is a hop string in the form of host:port/Transport
       * @throws IllegalArgument exception if string is not properly formatted or null.
       */
      HopImpl(String hop) throws IllegalArgumentException {
  
          if (hop == null)
              throw new IllegalArgumentException("Null arg!");
  
          // System.out.println("hop = " + hop);
          int brack = hop.indexOf(']');
          int colon = hop.indexOf(':',brack);
          int slash = hop.indexOf('/',colon);
  
          if (colon>0) {
              this.host = hop.substring(0,colon);
              String portstr;
              if (slash>0) {
                  portstr = hop.substring(colon+1,slash);
                  this.transport = hop.substring(slash+1);
              } else {
                  portstr = hop.substring(colon+1);
                  this.transport = "UDP";
              }
              try {
                  port = Integer.parseInt(portstr);
              } catch (NumberFormatException ex) {
                  throw new IllegalArgumentException("Bad port spec");
              }
          } else {
              if (slash>0) {
                  this.host = hop.substring(0,slash);
                  this.transport = hop.substring(slash+1);
                  this.port = transport.equalsIgnoreCase("TLS") ? 5061 : 5060;
              } else {
                  this.host = hop;
                  this.transport = "UDP";
                  this.port = 5060;
              }
          }
  
          // Validate it
          if (host == null || host.length() == 0)
              throw new IllegalArgumentException("no host!");
  
          // normalize
          this.host = this.host.trim();
          this.transport = this.transport.trim();
  
          if ((brack>0) && host.charAt(0)!='[') {
              throw new IllegalArgumentException("Bad IPv6 reference spec");
          }
  
          if (transport.compareToIgnoreCase("UDP") != 0
              && transport.compareToIgnoreCase("TLS") != 0
              && transport.compareToIgnoreCase("TCP") != 0) {
              System.err.println("Bad transport string " + transport);
              throw new IllegalArgumentException(hop);
          }
      }
  
      /**
       * Retruns the host string.
       * @return host String
       */
      public String getHost() {
          return host;
      }
  
      /**
       * Returns the port.
       * @return port integer.
       */
      public int getPort() {
          return port;
      }
  
      /** returns the transport string.
       */
      public String getTransport() {
          return transport;
      }
  
  
  
      /** Return true if this is uriRoute
       */
      public boolean isURIRoute() {
          return uriRoute;
      }
  
      /** Set the URIRoute flag.
       */
      public void setURIRouteFlag() {
          uriRoute = true;
      }
  
  
  
  }
  