From 3e619a735e63a1222e71060d9e65b354a156b158 Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Wed, 28 Jan 2015 23:45:38 +0100
Subject: o Major refactoring on  the BtPromise, mainly internal. Renaming
 BtPromise to BtSequence and BtSequencer.

---
 bt/src/main/java/io/trygvis/android/Optional.java | 45 +++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 bt/src/main/java/io/trygvis/android/Optional.java

(limited to 'bt/src/main/java/io/trygvis/android/Optional.java')

diff --git a/bt/src/main/java/io/trygvis/android/Optional.java b/bt/src/main/java/io/trygvis/android/Optional.java
new file mode 100644
index 0000000..616f9a7
--- /dev/null
+++ b/bt/src/main/java/io/trygvis/android/Optional.java
@@ -0,0 +1,45 @@
+package io.trygvis.android;
+
+public final class Optional<T> {
+    private final T value;
+
+    public Optional(T value) {
+        this.value = value;
+    }
+
+    public T get() {
+        if (value == null) {
+            throw new IllegalStateException("get() on empty");
+        }
+
+        return value;
+    }
+
+    public boolean isPresent() {
+        return value != null;
+    }
+
+    public void ifPresent(Consumer<T> consumer) {
+        if (value == null) {
+            return;
+        }
+
+        consumer.accept(value);
+    }
+
+    public static <T> Optional<T> of(T t) {
+        if (t == null) {
+            throw new IllegalArgumentException("t can't be null");
+        }
+
+        return new Optional<>(t);
+    }
+
+    public static <T> Optional<T> empty() {
+        return new Optional<>(null);
+    }
+
+    public static <T> Optional<T> ofNullable(T t) {
+        return t != null ? of(t) : empty();
+    }
+}
-- 
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