private String transformKey(String key, String src, String tgt) {
        StringBuilder sb = new StringBuilder();
        String[] srcTokens = src.split(WILDCARD_DELIM_REGEX);
        String[] tgtTokens = tgt.split(WILDCARD_DELIM_REGEX);
        int len = Math.max(srcTokens.length, tgtTokens.length);
        int pos = 0;
        int start = 0;
        
        for (int i = 0; i <= len; i++) {
            String srcx = i >= srcTokens.length ? "" : srcTokens[i];
            String tgtx = i >= tgtTokens.length ? "" : tgtTokens[i];
            pos = i == len ? key.length() : pos;
            
            if ("*".equals(srcx) || "?".equals(srcx)) {
                start = pos;
            } else {
                pos = key.indexOf(srcx, pos);
                
                if (pos > start) {
                    sb.append(key.substring(start, pos));
                }
                
                start = pos += srcx.length();
                sb.append(tgtx);
            }
            
        }
        
        return sb.toString();
    }
private String transformKey ( String key , String src , String tgt ) { StringBuilder sb = new StringBuilder ( ) ; String [ ] srcTokens = src . split ( WILDCARD_DELIM_REGEX ) ; String [ ] tgtTokens = tgt . split ( WILDCARD_DELIM_REGEX ) ; int len = Math . max ( srcTokens . length , tgtTokens . length ) ; int pos = 0 ; int start = 0 ; for ( int i = 0 ; i <= len ; i ++ ) { String srcx = i >= srcTokens . length ? "" : srcTokens [ i ] ; String tgtx = i >= tgtTokens . length ? "" : tgtTokens [ i ] ; pos = i == len ? key . length ( ) : pos ; if ( "*" . equals ( srcx ) || "?" . equals ( srcx ) ) { start = pos ; } else { pos = key . indexOf ( srcx , pos ) ; if ( pos > start ) { sb . append ( key . substring ( start , pos ) ) ; } start = pos += srcx . length ( ) ; sb . append ( tgtx ) ; } } return sb . toString ( ) ; }
Uses the source and target wildcard masks to transform an input key.

@param key The input key.
@param src The source wildcard mask.
@param tgt The target wildcard mask.
@return The transformed key.