Initial Jack import.

Change-Id: I953cf0a520195a7187d791b2885848ad0d5a9b43

1 files changed, 43 insertions, 0 deletions

diff --git a/guava/src/com/google/common/util/concurrent/Callables.java b/guava/src/com/google/common/util/concurrent/Callables.java
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+++ b/guava/src/com/google/common/util/concurrent/Callables.java
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+/*
+ * Copyright (C) 2009 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 com.google.common.util.concurrent;
+
+import java.util.concurrent.Callable;
+
+import javax.annotation.Nullable;
+
+/**
+ * Static utility methods pertaining to the {@link Callable} interface.
+ *
+ * @author Isaac Shum
+ * @since 1.0
+ */
+public final class Callables {
+  private Callables() {}
+
+  /**
+   * Creates a {@code Callable} which immediately returns a preset value each
+   * time it is called.
+   */
+  public static <T> Callable<T> returning(final @Nullable T value) {
+    return new Callable<T>() {
+      @Override public T call() {
+        return value;
+      }
+    };
+  }
+}