From 60800e155612bea797eed93c67046a23d26054cc Mon Sep 17 00:00:00 2001
From: Moxie Marlinspike <moxie@thoughtcrime.org>
Date: Mon, 24 Nov 2014 12:54:30 -0800
Subject: Break out into separate repo.

---
 .../libaxolotl/util/guava/Present.java             | 88 ++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 src/main/java/org/whispersystems/libaxolotl/util/guava/Present.java

(limited to 'src/main/java/org/whispersystems/libaxolotl/util/guava/Present.java')

diff --git a/src/main/java/org/whispersystems/libaxolotl/util/guava/Present.java b/src/main/java/org/whispersystems/libaxolotl/util/guava/Present.java
new file mode 100644
index 00000000..630570ff
--- /dev/null
+++ b/src/main/java/org/whispersystems/libaxolotl/util/guava/Present.java
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2011 The Guava Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.whispersystems.libaxolotl.util.guava;
+
+import static org.whispersystems.libaxolotl.util.guava.Preconditions.checkNotNull;
+
+import java.util.Collections;
+import java.util.Set;
+
+/**
+ * Implementation of an {@link Optional} containing a reference.
+ */
+
+final class Present<T> extends Optional<T> {
+  private final T reference;
+
+  Present(T reference) {
+    this.reference = reference;
+  }
+
+  @Override public boolean isPresent() {
+    return true;
+  }
+
+  @Override public T get() {
+    return reference;
+  }
+
+  @Override public T or(T defaultValue) {
+    checkNotNull(defaultValue, "use orNull() instead of or(null)");
+    return reference;
+  }
+
+  @Override public Optional<T> or(Optional<? extends T> secondChoice) {
+    checkNotNull(secondChoice);
+    return this;
+  }
+
+  @Override public T or(Supplier<? extends T> supplier) {
+    checkNotNull(supplier);
+    return reference;
+  }
+
+  @Override public T orNull() {
+    return reference;
+  }
+
+  @Override public Set<T> asSet() {
+    return Collections.singleton(reference);
+  }
+  
+  @Override public <V> Optional<V> transform(Function<? super T, V> function) {
+    return new Present<V>(checkNotNull(function.apply(reference),
+        "Transformation function cannot return null."));
+  }
+
+  @Override public boolean equals(Object object) {
+    if (object instanceof Present) {
+      Present<?> other = (Present<?>) object;
+      return reference.equals(other.reference);
+    }
+    return false;
+  }
+
+  @Override public int hashCode() {
+    return 0x598df91c + reference.hashCode();
+  }
+
+  @Override public String toString() {
+    return "Optional.of(" + reference + ")";
+  }
+
+  private static final long serialVersionUID = 0;
+}
-- 
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