added implementation

1 files changed, 41 insertions, 0 deletions

diff --git a/src/main/java/eu/ortlepp/notificationsender/service/NotificationSender.java b/src/main/java/eu/ortlepp/notificationsender/service/NotificationSender.java
new file mode 100644
index 0000000..8c39c72
--- /dev/null
+++ b/src/main/java/eu/ortlepp/notificationsender/service/NotificationSender.java
@@ -0,0 +1,41 @@
+package eu.ortlepp.notificationsender.service;
+
+import java.util.List;
+
+/**
+ * Interface for notification senders.
+ */
+public interface NotificationSender {
+
+  /**
+   * Send a list of notifications.
+   *
+   * @param notifications The notifications to send
+   * @return The result of the sending; true = successful, false = error occurred
+   */
+  boolean sendNotifications(final List<String> notifications);
+
+
+  /**
+   * Format notifications for sending.
+   * If only one notification is passed, it is returned as is.
+   * If multiple notifications are passed, a numbered list of notifications is returned.
+   *
+   * @param notifications The notifications to format
+   * @return The formatted notifications
+   */
+  default String formatNotifications(final List<String> notifications) {
+    if (notifications.size() == 1) {
+      return notifications.getFirst() + "\n\n";
+    }
+    StringBuilder builder = new StringBuilder();
+    for (int i = 0; i < notifications.size(); i++) {
+      builder.append(i + 1)
+              .append(". Notification:\n")
+              .append(notifications.get(i))
+              .append("\n\n");
+    }
+    return builder.toString();
+  }
+
+}