Replace strings : String replace « Data Type « Java





Replace strings

    
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 */

import java.security.SecureRandom;
import java.util.Properties;
import java.util.Random;

public class StringUtils
{

  /**
   *  Replaces the relevant entities inside the String.
   *  All & >, <, and " are replaced by their
   *  respective names.
   *
   *  @since 1.6.1
   *  @param src The source string.
   *  @return The encoded string.
   */
  public static String replaceEntities( String src )
  {
      src = replaceString( src, "&", "&" );
      src = replaceString( src, "<", "&lt;" );
      src = replaceString( src, ">", "&gt;" );
      src = replaceString( src, "\"", "&quot;" );

      return src;
  }

  /**
   *  Replaces a string with an other string.
   *
   *  @param orig Original string.  Null is safe.
   *  @param src  The string to find.
   *  @param dest The string to replace <I>src</I> with.
   *  @return A string with the replacement done.
   */
  public static final String replaceString( String orig, String src, String dest )
  {
      if ( orig == null ) return null;
      if ( src == null || dest == null ) throw new NullPointerException();
      if ( src.length() == 0 ) return orig;

      StringBuffer res = new StringBuffer(orig.length()+20); // Pure guesswork
      int start = 0;
      int end = 0;
      int last = 0;

      while ( (start = orig.indexOf(src,end)) != -1 )
      {
          res.append( orig.substring( last, start ) );
          res.append( dest );
          end  = start+src.length();
          last = start+src.length();
      }

      res.append( orig.substring( end ) );

      return res.toString();
  }

  /**
   *  Replaces a part of a string with a new String.
   *
   *  @param start Where in the original string the replacing should start.
   *  @param end Where the replacing should end.
   *  @param orig Original string.  Null is safe.
   *  @param text The new text to insert into the string.
   *  @return The string with the orig replaced with text.
   */
  public static String replaceString( String orig, int start, int end, String text )
  {
      if( orig == null ) return null;

      StringBuffer buf = new StringBuffer(orig);

      buf.replace( start, end, text );

      return buf.toString();
  }
  
  /**
   *  Replaces a string with an other string. Case insensitive matching is used
   *
   *  @param orig Original string.  Null is safe.
   *  @param src  The string to find.
   *  @param dest The string to replace <I>src</I> with.
   *  @return A string with all instances of src replaced with dest.
   */
  public static String replaceStringCaseUnsensitive( String orig, String src, String dest )
  {
      if( orig == null ) return null;

      StringBuffer res = new StringBuffer();
      int start        = 0;
      int end          = 0;
      int last         = 0;
      
      String origCaseUnsn = orig.toLowerCase();
      String srcCaseUnsn = src.toLowerCase();

      while( (start = origCaseUnsn.indexOf(srcCaseUnsn, end)) != -1 )
      {
          res.append( orig.substring( last, start ) );
          res.append( dest );
          end  = start+src.length();
          last = start+src.length();
      }

      res.append( orig.substring( end ) );

      return res.toString();
  }


}

   
    
    
    
  










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