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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one
    3    * or more contributor license agreements.  See the NOTICE file
    4    * distributed with this work for additional information
    5    * regarding copyright ownership.  The ASF licenses this file
    6    * to you under the Apache License, Version 2.0 (the
    7    * "License"); you may not use this file except in compliance
    8    * with the License.  You may obtain a copy of the License at
    9    *
    10   *   http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   * Unless required by applicable law or agreed to in writing,
    13   * software distributed under the License is distributed on an
    14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   * KIND, either express or implied.  See the License for the
    16   * specific language governing permissions and limitations
    17   * under the License.
    18   */
    19  package org.apache.myfaces.shared_orchestra.renderkit.html.util;
    20
    21
    22
    23
    24  /**
    25   * Converts characters outside of latin-1 set in a string to numeric character references.
    26   *
    27   */
    28  public abstract class UnicodeEncoder
    29  {
    30      /**
    31       * Encodes the given string, so that it can be used within a html page.
    32       * @param string the string to convert
    33       */
    34      public static String encode (String string)
    35      {
    36          if (string == null)
    37          {
    38              return "";
    39          }
    40
    41          StringBuffer sb = null;
    42          char c;
    43          for (int i = 0; i < string.length (); ++i)
    44          {
    45              c = string.charAt(i);
    46              if (((int)c) >= 0x80)
    47              {
    48                  if( sb == null ){
    49                      sb = new StringBuffer( string.length()+4 );
    50                      sb.append( string.substring(0,i) );
    51                  }
    52                  //encode all non basic latin characters
    53                  sb.append("&#" + ((int)c) + ";");
    54              }
    55              else if( sb != null )
    56              {
    57                  sb.append(c);
    58              }
    59          }
    60
    61          return sb != null ? sb.toString() : string;
    62      }
    63
    64
    65  }