+ /** Whether the operation failed. */
+ private boolean failed;
+
+ /**
+ * Returns whether the operation failed.
+ *
+ * @return <code>true</code> if the operation failed, <code>false</code>
+ * otherwise
+ */
+ public boolean isFailed() {
+ return failed;
+ }
+
+ /**
+ * Sets whether the operation failed.
+ *
+ * @param failed
+ * <code>true</code> if the operation failed,
+ * <code>false</code> otherwise
+ */
+ void setFailed(boolean failed) {
+ this.failed = failed;
+ }