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.message;
  
  import gov2.nist.javax2.sip.header.*;
  import gov2.nist.javax2.sip.header.ims.*;
  
  import java.util.Hashtable;
  
  /**
   * A map of which of the standard headers may appear as a list
   *
   * @version 1.2 $Revision: 1.14 $ $Date: 2009/07/17 18:57:53 $
   * @since 1.1
   */
  class ListMap {
      // A table that indicates whether a header has a list representation or
      // not (to catch adding of the non-list form when a list exists.)
      // Entries in this table allow you to look up the list form of a header
      // (provided it has a list form). Note that under JAVA-5 we have
      // typed collections which would render such a list obsolete. However,
      // we are not using java 5.
      private static Hashtable<Class<?>,Class<?>> headerListTable;
  
      private static boolean initialized;
      static {
          initializeListMap();
      }
  
      static private void initializeListMap() {
          /*
           * Build a table mapping between objects that have a list form and the
           * class of such objects.
           */
          headerListTable = new Hashtable<Class<?>, Class<?>>();
          headerListTable.put(ExtensionHeaderImpl.class, ExtensionHeaderList.class);
  
          headerListTable.put(Contact.class, ContactList.class);
  
          headerListTable.put(ContentEncoding.class, ContentEncodingList.class);
  
          headerListTable.put(Via.class, ViaList.class);
  
          headerListTable.put(WWWAuthenticate.class, WWWAuthenticateList.class);
  
          headerListTable.put(Accept.class, AcceptList.class);
  
          headerListTable.put(AcceptEncoding.class, AcceptEncodingList.class);
  
          headerListTable.put(AcceptLanguage.class, AcceptLanguageList.class);
  
          headerListTable.put(ProxyRequire.class, ProxyRequireList.class);
  
          headerListTable.put(Route.class, RouteList.class);
  
          headerListTable.put(Require.class, RequireList.class);
  
          headerListTable.put(Warning.class, WarningList.class);
  
          headerListTable.put(Unsupported.class, UnsupportedList.class);
  
          headerListTable.put(AlertInfo.class, AlertInfoList.class);
  
          headerListTable.put(CallInfo.class, CallInfoList.class);
  
          headerListTable.put(ProxyAuthenticate.class,ProxyAuthenticateList.class);
  
          headerListTable.put(ProxyAuthorization.class, ProxyAuthorizationList.class);
  
          headerListTable.put(Authorization.class, AuthorizationList.class);
  
          headerListTable.put(Allow.class, AllowList.class);
  
          headerListTable.put(RecordRoute.class, RecordRouteList.class);
  
          headerListTable.put(ContentLanguage.class, ContentLanguageList.class);
  
          headerListTable.put(ErrorInfo.class, ErrorInfoList.class);
  
          headerListTable.put(Supported.class, SupportedList.class);
  
          headerListTable.put(InReplyTo.class,InReplyToList.class);
  
          // IMS headers.
  
          headerListTable.put(PAssociatedURI.class, PAssociatedURIList.class);
  
          headerListTable.put(PMediaAuthorization.class, PMediaAuthorizationList.class);
  
          headerListTable.put(Path.class, PathList.class);
  
          headerListTable.put(Privacy.class,PrivacyList.class);
  
          headerListTable.put(ServiceRoute.class, ServiceRouteList.class);
  
          headerListTable.put(PVisitedNetworkID.class, PVisitedNetworkIDList.class);
  
          headerListTable.put(SecurityClient.class, SecurityClientList.class);
  
          headerListTable.put(SecurityServer.class, SecurityServerList.class);
  
          headerListTable.put(SecurityVerify.class, SecurityVerifyList.class);
  
          headerListTable.put(PAssertedIdentity.class, PAssertedIdentityList.class);
  
          initialized = true;
  
      }
  
      /**
       * return true if this has an associated list object.
       */
      static protected boolean hasList(SIPHeader sipHeader) {
          if (sipHeader instanceof SIPHeaderList)
              return false;
          else {
              Class<?> headerClass = sipHeader.getClass();
              return headerListTable.get(headerClass) != null;
          }
      }
  
      /**
       * Return true if this has an associated list object.
       */
      static protected boolean hasList(Class<?> sipHdrClass) {
          if (!initialized)
              initializeListMap();
          return headerListTable.get(sipHdrClass) != null;
      }
  
      /**
       * Get the associated list class.
       */
      static protected Class<?> getListClass(Class<?> sipHdrClass) {
          if (!initialized)
              initializeListMap();
          return (Class<?>) headerListTable.get(sipHdrClass);
      }
  
      /**
       * Return a list object for this header if it has an associated list object.
       */
      @SuppressWarnings("unchecked")
      static protected SIPHeaderList<SIPHeader> getList(SIPHeader sipHeader) {
          if (!initialized)
              initializeListMap();
          try {
              Class<?> headerClass = sipHeader.getClass();
              Class<?> listClass =  headerListTable.get(headerClass);
              SIPHeaderList<SIPHeader> shl = (SIPHeaderList<SIPHeader>) listClass.newInstance();
              shl.setHeaderName(sipHeader.getName());
              return shl;
          } catch (InstantiationException ex) {
              ex.printStackTrace();
          } catch (IllegalAccessException ex) {
              ex.printStackTrace();
          }
          return null;
      }
  
  }
  
  