bz-68462: Prevent StringIndexOutOfBoundsException when EmailAddress i…

…s passed an empty String

WHATSNEW

@@ -31,6 +31,11 @@ Fixed bugs:
    command in the JDK supports the "--release" option.
    Github Pull Request #205
 
+ * Fixes a bug in org.apache.tools.ant.taskdefs.email.EmailAddress which
+   would throw a java.lang.StringIndexOutOfBoundsException if the email
+   address passed to its constructor was an empty String.
+   Bugzilla Report 68462
+
 
 Changes from Ant 1.10.13 TO Ant 1.10.14
 =======================================

src/main/org/apache/tools/ant/taskdefs/email/EmailAddress.java

@@ -117,6 +117,9 @@ public EmailAddress(String email) {
      *  '(', ')', '"', '<', '>' from the start and end of strings
      */
     private String trim(String t, boolean trimAngleBrackets) {
+        if (t.isEmpty()) {
+            return t;
+        }
         int start = 0;
         int end = t.length();
         boolean trim;

src/tests/junit/org/apache/tools/ant/taskdefs/email/EmailAddressTest.java

@@ -93,6 +93,17 @@ public void testD() {
         expectNameAddress3(new EmailAddress(" < address > "));
     }
 
+    /**
+     * verify that an empty value to EmailAddress constructor doesn't lead to
+     * a StringIndexOutOfBoundsException
+     */
+    @Test
+    public void testEmpty() {
+        final EmailAddress addr = new EmailAddress("");
+        assertEquals("", addr.getName());
+        assertEquals("", addr.getAddress());
+    }
+
     private void expectNameAddress(EmailAddress e) {
         assertEquals("name", e.getName());
         assertEquals("address", e.getAddress());