1 files changed, 47 insertions, 0 deletions
diff --git a/src/main/model/ObservedData.java b/src/main/model/ObservedData.java
new file mode 100644
index 0000000..5ad91a3
--- /dev/null
+++ b/src/main/model/ObservedData.java
@@ -0,0 +1,47 @@
+package model;
+
+/**
+ * A single observed data that notifies the observer once changed.
+ */
+public class ObservedData<T> {
+    /**
+     * The data.
+     */
+    private T data;
+
+    /**
+     * The observer.
+     */
+    private Observer<T> acceptor;
+
+    /**
+     * EFFECTS: Init with the given initial value and observer.
+     * REQUIRES: acceptor != null
+     */
+    public ObservedData(T initialValue, Observer<T> acceptor) {
+        this.data = initialValue;
+        this.acceptor = acceptor;
+    }
+
+    /**
+     * EFFECTS: Set the data and notify the observer with the new data and DIRECTION_CHANGE + INDEX_NOT_IN_LIST.
+     */
+    public void set(T data) {
+        this.data = data;
+        acceptor.accept(data, Observer.DIRECTION_CHANGE, Observer.INDEX_NOT_IN_LIST);
+    }
+
+    /**
+     * EFFECTS: Get the data.
+     */
+    public T get() {
+        return data;
+    }
+
+    /**
+     * EFFECTS: Get the observer.
+     */
+    public Observer<T> getAcceptor() {
+        return acceptor;
+    }
+}