content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.camel.component.ldap;
  
  public final class LdapHelper {
  
      private LdapHelper() {
      }
  
      /**
       * Given an LDAP search string, returns the string with certain characters escaped according to RFC 2254 guidelines.
       * The character mapping is as follows:
       * <ul>
       * <li>* = \2a</li>
       * <li>( = \28</li>
       * <li>) = \29</li>
       * <li>\ = \5c</li>
       * <li>\0 = \00</li>
       * </ul>
       *
       * @param  filter string to escape according to RFC 2254 guidelines
       * @return        String the escaped/encoded result
       */
      public static String escapeFilter(String filter) {
          if (filter == null) {
              return null;
          }
          StringBuilder buf = new StringBuilder(filter.length());
          for (int i = 0; i < filter.length(); i++) {
              char c = filter.charAt(i);
              switch (c) {
                  case '\\':
                      buf.append("\\5c");
                      break;
                  case '*':
                      buf.append("\\2a");
                      break;
                  case '(':
                      buf.append("\\28");
                      break;
                  case ')':
                      buf.append("\\29");
                      break;
                  case '\0':
                      buf.append("\\00");
                      break;
                  default:
                      buf.append(c);
                      break;
              }
          }
          return buf.toString();
      }
  }
  