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

        if (log.isTraceEnabled()) {
            log.trace("  Scanning TLDs in " + rootPath + " subdirectory");
        }


        try {
            NamingEnumeration items = resources.list(rootPath);
            while (items.hasMoreElements()) {
                NameClassPair item = (NameClassPair) items.nextElement();
                String resourcePath = rootPath + "/" + item.getName();
                if (!resourcePath.endsWith(".tld")
                        && (resourcePath.startsWith("/WEB-INF/classes")
                            || resourcePath.startsWith("/WEB-INF/lib"))) {
                    continue;

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                            constraints.setDerefLinkFlag(deref_link);
                            constraints.setCountLimit(count_limit);
                            if (attrList.length > 0) {
                                constraints.setReturningAttributes(attrList);
                            }
                            NamingEnumeration ldapresults = ctx.search(searchbase, filter, constraints);


                            if (!doc_element.equals("")) {
                                transformer.start(doc_element, attr);
                            }


                            while (ldapresults != null && ldapresults.hasMore()) {
                                if (!row_element.equals("")) {
                                    transformer.start(row_element, attr);
                                }
                                SearchResult si = (SearchResult)ldapresults.next();
                                javax.naming.directory.Attributes attrs = si.getAttributes();
                                if (attrs != null) {
                                    NamingEnumeration ae = attrs.getAll();
                                    while (ae.hasMoreElements()) {
                                        Attribute at = (Attribute)ae.next();
                                        Enumeration vals = at.getAll();
                                        String attrID = at.getID();
                                        if (showAttribute) {
                                            transformer.start(attrID, attr);
                                        }
                                        String attrVal = (String)vals.nextElement();
                                        if (query_index > 0) {
                                            switch (transformer.getQuery(query_index-1).current_state) {
                                                case LDAPTransformer.STATE_INSIDE_FILTER_ELEMENT:
                                                    if (!transformer.getQuery(query_index-1).filter.equals("")) {
                                                        transformer.getQuery(query_index-1).filter.concat(", ");
                                                    }
                                                    transformer.getQuery(query_index-1).filter.concat(attrID).concat("=").concat(attrVal);
                                                    break;
                                                default:
                                                    transformer.start(attrID, attr);
                                            }
                                        } else {
                                            transformer.data(String.valueOf(attrVal));
                                        }
                                        if (showAttribute) {
                                            transformer.end(attrID);
                                        }
                                    }
                                }
                                if (!row_element.equals("")) {
                                    transformer.end(row_element);
                                }
                            }
                            if (!doc_element.equals("")) {
                                transformer.end(doc_element);
                            }
                        } catch(Exception e) {
                            if (sax_error) {
                                throw new Exception ("[LDAPTransformer] Error in LDAP-Query: " + e.toString());
                            } else {
                                transformer.start(error_element, attr);
                                transformer.data("[LDAPTransformer] Error in LDAP-Query: " + e);
                                transformer.end(error_element);
                                transformer.getTheLogger().error("[LDAPTransformer] Exception: " + e.toString());
                            }
                        }
                        break;
                    case LDAPTransformer.STATE_INSIDE_EXECUTE_INCREMENT:
                        try {
                            if (scope.equals("OBJECT_SCOPE")) {
                                constraints.setSearchScope(SearchControls.OBJECT_SCOPE);
                            } else if (scope.equals("SUBTREE_SCOPE")) {
                                constraints.setSearchScope(SearchControls.SUBTREE_SCOPE);
                            } else {
                                constraints.setSearchScope(SearchControls.ONELEVEL_SCOPE);
                            }
                            constraints.setTimeLimit(time_limit);
                            constraints.setDerefLinkFlag(deref_link);
                            constraints.setCountLimit(count_limit);
                            if (attrList.length != 1) {
                                transformer.start(error_element, attr);
                                transformer.data("Increment must reference exactly 1 attribute.");
                                transformer.end(error_element);
                            } else {
                                constraints.setReturningAttributes(attrList);
                                NamingEnumeration ldapresults = ctx.search(searchbase, filter, constraints);
                                int attrVal = 0;
                                String attrID = "";
                                SearchResult si = null;
                                while (ldapresults != null && ldapresults.hasMore()) {
                                    si = (SearchResult)ldapresults.next();
                                    javax.naming.directory.Attributes attrs = si.getAttributes();
                                    if (attrs != null) {
                                        NamingEnumeration ae = attrs.getAll();
                                        while (ae.hasMoreElements()) {
                                            Attribute at = (Attribute)ae.next();
                                            Enumeration vals = at.getAll();
                                            attrID = at.getID();
                                            attrVal = Integer.parseInt((String)vals.nextElement());
                                        }
                                    }

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      if (attributes == null)
          return (Collections.EMPTY_MAP);


      HashMap headerFields = new HashMap(attributes.size());
      NamingEnumeration attributeEnum = attributes.getIDs();
      try {
          while (attributeEnum.hasMore()) {
              String attributeID = (String)attributeEnum.next();
              Attribute attribute = attributes.get(attributeID);
              if (attribute == null) continue;
              ArrayList attributeValueList = new ArrayList(attribute.size());
              NamingEnumeration attributeValues = attribute.getAll();
              while (attributeValues.hasMore()) {
                  Object attrValue = attributeValues.next();
                  attributeValueList.add(getHeaderValueAsString(attrValue));
              }
              attributeValueList.trimToSize(); // should be a no-op if attribute.size() didn't lie
              headerFields.put(attributeID, Collections.unmodifiableList(attributeValueList));
          }

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        }
        
        if (attributes == null)
            return (null);


        NamingEnumeration attributeEnum = attributes.getIDs();
        try {
            while (attributeEnum.hasMore()) {
                String attributeID = (String)attributeEnum.next();
                if (attributeID.equalsIgnoreCase(name)) {
                    Attribute attribute = attributes.get(attributeID);
                    if (attribute == null) return null;
                    Object attrValue = attribute.get(attribute.size()-1);
                    return getHeaderValueAsString(attrValue);

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        Vector result = new Vector();
        
        if (collection != null) {
            try {
                NamingEnumeration enumeration = context.list(getURL().getFile());
                while (enumeration.hasMoreElements()) {
                    NameClassPair ncp = (NameClassPair) enumeration.nextElement();
                    result.addElement(ncp.getName());
                }
            } catch (NamingException e) {
                // Unexpected exception
                throw new FileNotFoundException(

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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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        if (roleSearchSubtreeBool) {
            constraints.setSearchScope(SearchControls.SUBTREE_SCOPE);
        } else {
            constraints.setSearchScope(SearchControls.ONELEVEL_SCOPE);
        }
        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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            String[] attribs = new String[list.size()];
            list.toArray(attribs);
            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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        if (roleSearchSubtreeBool) {
            constraints.setSearchScope(SearchControls.SUBTREE_SCOPE);
        } else {
            constraints.setSearchScope(SearchControls.ONELEVEL_SCOPE);
        }
        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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