Bug #20652 fixed.

Submitted by:	Fredrik Westermarck


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@137370 13f79535-47bb-0310-9956-ffa450edef68

Author: Henri Yandell

src/java/org/apache/commons/lang/StringUtils.java

@@ -77,7 +77,7 @@
  * @author Arun Mammen Thomas
  * @author <a href="mailto:ggregory@seagullsw.com">Gary Gregory</a>
  * @since 1.0
- * @version $Id: StringUtils.java,v 1.46 2003/06/08 14:10:54 scolebourne Exp $
+ * @version $Id: StringUtils.java,v 1.47 2003/06/21 22:24:55 bayard Exp $
  */
 public class StringUtils {
 
@@ -1048,6 +1048,9 @@ public static String chop(String str) {
      */
     public static String chopNewline(String str) {
         int lastIdx = str.length() - 1;
+        if (lastIdx == 0) {
+            return "";
+        }
         char last = str.charAt(lastIdx);
         if (last == '\n') {
             if (str.charAt(lastIdx - 1) == '\r') {

src/test/org/apache/commons/lang/StringUtilsTest.java

@@ -69,7 +69,7 @@
  * @author <a href="mailto:fredrik@westermarck.com>Fredrik Westermarck</a>
  * @author Holger Krauth
  * @author <a href="hps@intermeta.de">Henning P. Schmiedehausen</a>
- * @version $Id: StringUtilsTest.java,v 1.19 2003/04/16 04:37:33 bayard Exp $
+ * @version $Id: StringUtilsTest.java,v 1.20 2003/06/21 22:24:56 bayard Exp $
  */
 public class StringUtilsTest extends TestCase {
 
@@ -333,6 +333,27 @@ public void testChomp() {
                 "foo", StringUtils.chomp("foo", "foooo"));
     }
 
+    public void testChopNewLine() {
+
+        String[][] newLineCases = {
+            { FOO + "\r\n", FOO } ,
+            { FOO + "\n" , FOO } ,
+            { FOO + "\r", FOO + "\r" },
+            { FOO, FOO },
+            { FOO + "\n" + FOO , FOO + "\n" + FOO },
+            { FOO + "\n\n", FOO + "\n"},
+            { "\n", "" },
+            { "\r\n", "" }
+      };
+
+      for (int i = 0; i < newLineCases.length; i++) {
+          String original = newLineCases[i][0];
+          String expectedResult = newLineCases[i][1];
+          assertEquals("chopNewline(String) failed",
+                  expectedResult, StringUtils.chopNewline(original));
+      }
+    }
+
     public void testSliceFunctions() {
 
         String[][] sliceCases = {