From 2517e3a84c69862453111ef4efdad314074cb32d Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Mon, 15 Sep 2014 20:29:47 -0400
Subject: lazy: Add LazySingleton scope.

---
 .../com/tavianator/sangria/lazy/LazyScopes.java    | 59 ++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 sangria-lazy/src/main/java/com/tavianator/sangria/lazy/LazyScopes.java

(limited to 'sangria-lazy/src/main/java/com/tavianator/sangria/lazy/LazyScopes.java')

diff --git a/sangria-lazy/src/main/java/com/tavianator/sangria/lazy/LazyScopes.java b/sangria-lazy/src/main/java/com/tavianator/sangria/lazy/LazyScopes.java
new file mode 100644
index 0000000..beb1294
--- /dev/null
+++ b/sangria-lazy/src/main/java/com/tavianator/sangria/lazy/LazyScopes.java
@@ -0,0 +1,59 @@
+/****************************************************************************
+ * Sangria                                                                  *
+ * Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com>             *
+ *                                                                          *
+ * 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 com.tavianator.sangria.lazy;
+
+import com.google.inject.Key;
+import com.google.inject.Provider;
+import com.google.inject.Scope;
+import com.google.inject.Scopes;
+
+/**
+ * Lazy scope implementations.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.2
+ * @since 1.2
+ */
+public class LazyScopes {
+    /**
+     * Lazy version of {@link Scopes#SINGLETON}.
+     *
+     * @see LazySingleton
+     */
+    public static final Scope LAZY_SINGLETON = new Scope() {
+        public <T> Provider<T> scope(final Key<T> key, final Provider<T> creator) {
+            final Provider<T> singleton = Scopes.SINGLETON.scope(key, creator);
+
+            return new Provider<T>() {
+                public T get() {
+                    return singleton.get();
+                }
+
+                @Override
+                public String toString() {
+                    return String.format("%s[%s]", creator, LAZY_SINGLETON);
+                }
+            };
+        }
+
+        @Override
+        public String toString() {
+            return "LazyScopes.LAZY_SINGLETON";
+        }
+    };
+}
-- 
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