refactor old StringBuffer usage

api/src/main/java/org/eclipse/daanse/olap/api/IdentifierSegment.java

@@ -70,9 +70,9 @@ public sealed interface IdentifierSegment permits KeyIdentifierSegment, NameIden
     String toString();
 
     /**
-     * Appends a string representation of this Segment to a StringBuffer.
+     * Appends a string representation of this Segment to a StringBuilder.
      *
-     * @param buf StringBuffer
+     * @param buf StringBuilder
      */
     void toString(StringBuilder buf);
 

common/src/main/java/org/eclipse/daanse/olap/common/Util.java

@@ -2315,9 +2315,8 @@ public static String replaceProperties(
         String text,
         Map<String, String> env)
     {
-        // As of JDK 1.5, cannot use StringBuilder - appendReplacement requires
-        // the antediluvian StringBuffer.
-        StringBuffer buf = new StringBuffer(text.length() + 200);
+        // Since Java 9, Matcher.appendReplacement accepts StringBuilder
+        StringBuilder buf = new StringBuilder(text.length() + 200);
 
         Pattern pattern = Pattern.compile("\\$\\{([^${}]+)\\}");
         Matcher matcher = pattern.matcher(text);

common/src/test/java/org/eclipse/daanse/olap/function/def/crossjoin/CrossJoinTest.java

@@ -338,7 +338,7 @@ protected void doMTupleTupleListTest(
   // Helper methods
   ////////////////////////////////////////////////////////////////////////
   protected String toString( TupleIterable l ) {
-    StringBuffer buf = new StringBuffer( 100 );
+    StringBuilder buf = new StringBuilder( 100 );
     buf.append( '{' );
     int j = 0;
     for ( List<Member> o : l ) {