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.converter.jaxb;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Provides filtering of characters that do fall into
   * <a href="http://www.w3.org/TR/2004/REC-xml-20040204/#NT-Char">range defined by XML 1.0 spec</a>. <i>Filtering</i>
   * here means replacement with space char.
   *
   */
  class NonXmlCharFilterer {
      private static final Logger LOG = LoggerFactory.getLogger(NonXmlCharFilterer.class);
      private static final char REPLACEMENT_CHAR = ' ';
  
      /**
       * Determines whether specified character needs to be filtered.
       */
      boolean isFiltered(char c) {
          // Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] |
          // [#x10000-#x10FFFF]
          // Won't be checking last interval, as it goes beyond 0xFFFF.
          if (c == 0x9 || c == 0xA || c == 0xD || c >= 0x20 && c <= 0xD7FF
                  || c >= 0xE000 && c <= 0xFFFD) {
              return false;
          }
          return true;
      }
  
      /**
       * Filter specified char array by replacing non-XML chars with space. Only part of array specified by
       * <code>offset</code> and <code>length</code> is affected.
       *
       * @return <code>true</code> if <code>content</code> was modified, <code>false</code> otherwise.
       */
      public boolean filter(char[] content, int offset, int length) {
          if (content == null) {
              return false;
          }
  
          boolean filtered = false;
          for (int i = offset; i < offset + length; i++) {
              if (isFiltered(content[i])) {
                  filtered = true;
                  content[i] = REPLACEMENT_CHAR;
              }
          }
  
          if (filtered) {
              LOG.warn("Identified and replaced non-XML chars");
          }
  
          return filtered;
      }
  
      /**
       * Filter specified string by replacing illegal chars with space.
       *
       * @return filtered string
       */
      public String filter(String original) {
          if (original == null) {
              return null;
          }
  
          char[] chars = original.toCharArray();
          if (!filter(chars, 0, chars.length)) {
              return original;
          }
  
          String filtered = new String(chars);
          LOG.warn("Illegal characters were filtered; original => \"{}\", filtered => \"{}\"", original, filtered);
          return filtered;
      }
  
  }
  