2 files changed, 34 insertions, 0 deletions
diff --git a/app/src/main/java/com/camilstaps/common/Listener.java b/app/src/main/java/com/camilstaps/common/Listener.java
new file mode 100644
index 0000000..36319c6
--- /dev/null
+++ b/app/src/main/java/com/camilstaps/common/Listener.java
@@ -0,0 +1,20 @@
+package com.camilstaps.common;
+
+/**
+ * Abstract class for something listening for some object
+ * @author Camil Staps
+ */
+public abstract class Listener<T> {
+
+    /**
+     * To be called when the data is successfully retrieved
+     * @param data
+     */
+    public abstract void success(T data);
+
+    /**
+     * To be called when the data could not be retrieved
+     */
+    public abstract void failure();
+
+}
diff --git a/app/src/main/java/com/camilstaps/common/NullListener.java b/app/src/main/java/com/camilstaps/common/NullListener.java
new file mode 100644
index 0000000..c22e76d
--- /dev/null
+++ b/app/src/main/java/com/camilstaps/common/NullListener.java
@@ -0,0 +1,14 @@
+package com.camilstaps.common;
+
+/**
+ * Listener that discards all data and errors.
+ * @author Camil Staps
+ */
+public class NullListener<T> extends Listener<T> {
+
+    @Override
+    public void success(T data) { }
+
+    @Override
+    public void failure() { }
+}