content: package org.apache.lucene.search.highlight;
  /**
   * Copyright 2005 The Apache Software Foundation
   *
   * Licensed 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.
   */
  
  /**
   * Simple {@link Encoder} implementation to escape text for HTML output
   *
   */
  public class SimpleHTMLEncoder implements Encoder
  {
  	public SimpleHTMLEncoder()
  	{
  	}
  
  	public String encodeText(String originalText)
  	{
  		return htmlEncode(originalText);
  	}
  	
  	/**
  	 * Encode string into HTML
  	 */
  	public final static String htmlEncode(String plainText) 
  	{
  		if (plainText == null || plainText.length() == 0)
  		{
  			return "";
  		}
  
  		StringBuilder result = new StringBuilder(plainText.length());
  
  		for (int index=0; index<plainText.length(); index++) 
  		{
  			char ch = plainText.charAt(index);
  
  			switch (ch) 
  			{
  			case '"':
  				result.append("&quot;");
  				break;
  
  			case '&':
  				result.append("&amp;");
  				break;
  
  			case '<':
  				result.append("&lt;");
  				break;
  
  			case '>':
  				result.append("&gt;");
  				break;
  
  			default:
  				   if (ch < 128) 
  				   {
  			           result.append(ch);
  			       } 
  				   else 
  			       {
  			           result.append("&#").append((int)ch).append(";");
  			       }
  			}
  		}
  
  		return result.toString();
  	}
  }