package com.ctrip.framework.apollo.core.utils;

 import java.io.IOException;

 import java.io.StringWriter;

 import java.util.Properties;

 /**

  * @author Jason Song(song_s@ctrip.com)

  */

 public class PropertiesUtil {

   /**

    * Transform the properties to string format

    * @param properties the properties object

    * @return the string containing the properties

    * @throws IOException

    */

   public static String toString(Properties properties) throws IOException {

     StringWriter writer = new StringWriter();

     properties.store(writer, null);

     StringBuffer stringBuffer = writer.getBuffer();

     filterPropertiesComment(stringBuffer);

     return stringBuffer.toString();

   }

   /**

    * filter out the first comment line

    * @param stringBuffer the string buffer

    * @return true if filtered successfully, false otherwise

    */

   static boolean filterPropertiesComment(StringBuffer stringBuffer) {

     //check whether has comment in the first line

     if (stringBuffer.charAt(0) != '#') {

       return false;

     }

     int commentLineIndex = stringBuffer.indexOf("\n");

     if (commentLineIndex == -1) {

       return false;

     }

     stringBuffer.delete(0, commentLineIndex + 1);

     return true;

   }

 }