Optimized trimTrailingSpaces

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1300780 13f79535-47bb-0310-9956-ffa450edef68

Author: ebourg

src/main/java/org/apache/commons/csv/CSVParser.java

@@ -435,8 +435,12 @@ private Token simpleTokenLexer(Token tkn, int c) throws IOException {
     }
 
     private void trimTrailingSpaces(StringBuilder buffer) {
-        while (buffer.length() > 0 && Character.isWhitespace(buffer.charAt(buffer.length() - 1))) {
-            buffer.setLength(buffer.length() - 1);
+        int length = buffer.length();
+        while (length > 0 && Character.isWhitespace(buffer.charAt(length - 1))) {
+            length = length - 1;
+        }
+        if (length != buffer.length()) {
+            buffer.setLength(length);
         }
     }