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.header;
  
  /**
   * The call identifer that goes into a callID header and a in-reply-to header.
   *
   * @author M. Ranganathan   <br/>
   * @version 1.2 $Revision: 1.7 $ $Date: 2009/12/16 02:38:35 $
   * @see CallID
   * @see InReplyTo
   * @since 1.1
   */
  public final class CallIdentifier extends SIPObject {
  
      /**
       * Comment for <code>serialVersionUID</code>
       */
      private static final long serialVersionUID = 7314773655675451377L;
  
      /**
       * localId field
       */
      protected String localId;
  
      /**
       * host field
       */
      protected String host;
  
      /**
       * Default constructor
       */
      public CallIdentifier() {
      }
  
      /**
       * Constructor
       * @param localId id is the local id.
       * @param host is the host.
       */
      public CallIdentifier(String localId, String host) {
          this.localId = localId;
          this.host = host;
      }
  
      /**
       * constructor
       * @param cid String to set
       * @throws IllegalArgumentException if cid is null or is not a token,
       * or token@token
       */
      public CallIdentifier(String cid) throws IllegalArgumentException {
          setCallID(cid);
      }
  
      /**
       * Get the encoded version of this id.
       * @return String to set
       */
      public String encode() {
          return encode(new StringBuffer()).toString();
      }
  
      public StringBuffer encode(StringBuffer buffer) {
          buffer.append(localId);
          if (host != null) {
              buffer.append(AT).append(host);
          }
          return buffer;
      }
  
      /**
       * Compare two call identifiers for equality.
       * @param other Object to set
       * @return true if the two call identifiers are equals, false
       * otherwise
       */
      public boolean equals(Object other) {
          if (other == null ) return false;
          if (!other.getClass().equals(this.getClass())) {
              return false;
          }
          CallIdentifier that = (CallIdentifier) other;
          if (this.localId.compareTo(that.localId) != 0) {
              return false;
          }
          if (this.host == that.host)
              return true;
          if ((this.host == null && that.host != null)
              || (this.host != null && that.host == null))
              return false;
          if (host.compareToIgnoreCase(that.host) != 0) {
              return false;
          }
          return true;
      }
      
      @Override
      public int hashCode() {
          if (this.localId  == null ) {
               throw new UnsupportedOperationException("Hash code called before id is set");
          }
          return this.localId.hashCode();
      }
  
      /** get the LocalId field
       * @return String
       */
      public String getLocalId() {
          return localId;
      }
  
      /** get the host field
       * @return host member String
       */
      public String getHost() {
          return host;
      }
  
      /**
       * Set the localId member
       * @param localId String to set
       */
      public void setLocalId(String localId) {
          this.localId = localId;
      }
  
      /** set the callId field
       * @param cid Strimg to set
       * @throws IllegalArgumentException if cid is null or is not a token or
       * token@token
       */
      public void setCallID(String cid) throws IllegalArgumentException {
          if (cid == null)
              throw new IllegalArgumentException("NULL!");
          int index = cid.indexOf('@');
          if (index == -1) {
              localId = cid;
              host = null;
          } else {
              localId = cid.substring(0, index);
              host = cid.substring(index + 1, cid.length());
              if (localId == null || host == null) {
                  throw new IllegalArgumentException("CallID  must be token@token or token");
              }
          }
      }
  
      /**
       * Set the host member
       * @param host String to set
       */
      public void setHost(String host) {
          this.host = host;
      }
  }
  