Examples of javax.naming.NamingEnumeration

javax.naming.NamingEnumeration
This interface is for enumerating lists returned by methods in the javax.naming and javax.naming.directory packages. It extends Enumeration to allow as exceptions to be thrown during the enumeration.
When a method such as list(), listBindings(), or search() returns a NamingEnumeration, any exceptions encountered are reserved until all results have been returned. At the end of the enumeration, the exception is thrown (by hasMore());
For example, if the list() is returning only a partial answer, the corresponding exception would be PartialResultException. list() would first return a NamingEnumeration. When the last of the results has been returned by the NamingEnumeration's next(), invoking hasMore() would result in PartialResultException being thrown.
In another example, if a search() method was invoked with a specified size limit of 'n'. If the answer consists of more than 'n' results, search() would first return a NamingEnumeration. When the n'th result has been returned by invoking next() on the NamingEnumeration, a SizeLimitExceedException would then thrown when hasMore() is invoked.
Note that if the program uses hasMoreElements() and nextElement() instead to iterate through the NamingEnumeration, because these methods cannot throw exceptions, no exception will be thrown. Instead, in the previous example, after the n'th result has been returned by nextElement(), invoking hasMoreElements() would return false.
Note also that NoSuchElementException is thrown if the program invokes next() or nextElement() when there are no elements left in the enumeration. The program can always avoid this exception by using hasMore() and hasMoreElements() to check whether the end of the enumeration has been reached.
If an exception is thrown during an enumeration, the enumeration becomes invalid. Subsequent invocation of any method on that enumeration will yield undefined results. @author Rosanna Lee @author Scott Seligman @see Context#list @see Context#listBindings @see javax.naming.directory.DirContext#search @see javax.naming.directory.Attributes#getAll @see javax.naming.directory.Attributes#getIDs @see javax.naming.directory.Attribute#getAll @since 1.3

        }
        Attribute attr = attrs.get(attrId);
        if (attr == null) {
            return (values);
        }
        NamingEnumeration e = attr.getAll();
        while (e.hasMore()) {
            String value = (String) e.next();
            values.add(value);
        }
        return values;
    }

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      // provide defaults if not present (backward compatibility)
      String userAttribute = 
    defaultProperties.getProperty(USR_ATTR_PROP, USR_ATTR_DEFAULT);
      searchFilter = "(" + userAttribute + "=" + userId + ")";
      SearchControls scope = new SearchControls();
      NamingEnumeration results;


      recursiveSearch = isSubtreeSearch();
      if (recursiveSearch) {
    scope.setSearchScope(SearchControls.SUBTREE_SCOPE);
    objectName = defaultProperties.getProperty(PROVIDER_URL_PROP);
      }
      else {
    scope.setSearchScope(SearchControls.ONELEVEL_SCOPE);
    objectName =  
        defaultProperties.getProperty(USR_BRANCH_PROP, USR_BRANCH_DEFAULT);
      }
  
      if (log.isDebugEnabled())
    log.debug("searching object " + objectName + " filtering with " + searchFilter + ", recursive search ? " + recursiveSearch);


      results = context.search(objectName, searchFilter, scope);


      if (results != null && results.hasMore()) {
    result = (SearchResult)results.next();


    // sanity check: if more than one entry is returned
    // for a user-id, then the directory is probably flawed,
    // so it would be nice to warn the administrator.
    //

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                attribs = new String[]{userRoleName};
            }
            constraints.setReturningAttributes(attribs);




            NamingEnumeration results = context.search(userBase, filter, constraints);


            if (results == null || !results.hasMore()) {
                return false;
            }


            SearchResult result = (SearchResult) results.next();


            if (results.hasMore()) {
                //ignore for now
            }
            NameParser parser = context.getNameParser("");
            Name contextName = parser.parse(context.getNameInNamespace());
            Name baseName = parser.parse(userBase);

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            constraints.setSearchScope(SearchControls.SUBTREE_SCOPE);
        } else {
            constraints.setSearchScope(SearchControls.ONELEVEL_SCOPE);
        }
        constraints.setReturningAttributes(new String[] { roleName });
        NamingEnumeration results =
                context.search(roleBase, filter, constraints);
        while (results.hasMore()) {
            SearchResult result = (SearchResult) results.next();
            Attributes attrs = result.getAttributes();
            if (attrs == null) {
                continue;
            }
            list = addAttributeValues(roleName, attrs, list);

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        }
        Attribute attr = attrs.get(attrId);
        if (attr == null) {
            return (values);
        }
        NamingEnumeration e = attr.getAll();
        while (e.hasMore()) {
            String value = (String) e.next();
            values.add(value);
        }
        return values;
    }

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    * This method removes any previously registered topic expression evaluators, so handle with care.
    */
   public synchronized void refresh(  )
   {
      m_evaluators.clear(  );
      NamingEnumeration list = null;
      try
      {
         Context context = new InitialContext(  );
         list = context.list( JndiConstants.TOPIC_EXPRESSION_EVALUATOR_CONTEXT );
         while ( list.hasMore(  ) )
         {
            NameClassPair            pair      = (NameClassPair) list.next(  );
            TopicExpressionEvaluator evaluator =
               (TopicExpressionEvaluator) JNDIUtils.lookup( context,
                                                            JndiConstants.TOPIC_EXPRESSION_EVALUATOR_CONTEXT + "/"
                                                            + pair.getName(  ), TopicExpressionEvaluator.class );
            registerEvaluator( evaluator );
         }
      }
      catch ( NamingException ne )
      {
         LOG.warn( "topicEngineInitError: " + ne );
         registerEvaluator( new SimpleTopicExpressionEvaluator(  ) );
         registerEvaluator( new ConcreteTopicExpressionEvaluator(  ) );
         registerEvaluator( new FullTopicExpressionEvaluator(  ) );
      }
      finally
      {
         if ( list != null )
         {
            try
            {
               list.close(  );
            }
            catch ( NamingException ne )
            {
            }
         }

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                destDir.mkdirs();
            }


            // Looking up directory /WEB-INF/lib in the context
            try {
                NamingEnumeration enumeration = resources.listBindings(libPath);
                while (enumeration.hasMoreElements()) {


                    Binding binding = (Binding) enumeration.nextElement();
                    String filename = libPath + "/" + binding.getName();
                    if (!filename.endsWith(".jar"))
                        continue;


                    // Copy JAR in the work directory, always (the JAR file

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     */
    private boolean copyDir(DirContext srcDir, File destDir) {


        try {


            NamingEnumeration enumeration = srcDir.list("");
            while (enumeration.hasMoreElements()) {
                NameClassPair ncPair =
                    (NameClassPair) enumeration.nextElement();
                String name = ncPair.getName();
                Object object = srcDir.lookup(name);
                File currentFile = new File(destDir, name);
                if (object instanceof Resource) {
                    InputStream is = ((Resource) object).streamContent();

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        sb.append("<entries>");


        try {


            // Render the directory entries within this directory
            NamingEnumeration enumeration = resources.list(cacheEntry.name);
            
            // rewriteUrl(contextPath) is expensive. cache result for later reuse
            String rewrittenContextPath =  rewriteUrl(contextPath);


            while (enumeration.hasMoreElements()) {


                NameClassPair ncPair = (NameClassPair) enumeration.nextElement();
                String resourceName = ncPair.getName();
                String trimmed = resourceName/*.substring(trim)*/;
                if (trimmed.equalsIgnoreCase("WEB-INF") ||
                    trimmed.equalsIgnoreCase("META-INF") ||
                    trimmed.equalsIgnoreCase(localXsltFile))

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        sb.append("</tr>");


        try {


            // Render the directory entries within this directory
            NamingEnumeration enumeration = resources.list(cacheEntry.name);
            boolean shade = false;
            while (enumeration.hasMoreElements()) {


                NameClassPair ncPair = (NameClassPair) enumeration.nextElement();
                String resourceName = ncPair.getName();
                String trimmed = resourceName/*.substring(trim)*/;
                if (trimmed.equalsIgnoreCase("WEB-INF") ||
                    trimmed.equalsIgnoreCase("META-INF"))
                    continue;

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