+ /**
+ * Verifies that a value is not {@code null}.
+ *
+ * @param name value name
+ * @param value value to check
+ * @return the value
+ */
+ protected String getRequiredText(String name, String value) {
+ if (value == null) {
+ throw new IllegalArgumentException("missing " + name);
+ }
+
+ return value;
+ }
+