Initial Jack import.

Change-Id: I953cf0a520195a7187d791b2885848ad0d5a9b43

1 files changed, 78 insertions, 0 deletions

diff --git a/guava/src/com/google/common/util/concurrent/ForwardingCheckedFuture.java b/guava/src/com/google/common/util/concurrent/ForwardingCheckedFuture.java
new file mode 100644
index 0000000..1dee47a
--- /dev/null
+++ b/guava/src/com/google/common/util/concurrent/ForwardingCheckedFuture.java
@@ -0,0 +1,78 @@
+/*
+ * 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 com.google.common.util.concurrent;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Preconditions;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+/**
+ * A future which forwards all its method calls to another future. Subclasses
+ * should override one or more methods to modify the behavior of the backing 
+ * future as desired per the <a href=
+ * "http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
+ *
+ * <p>Most subclasses can simply extend {@link SimpleForwardingCheckedFuture}.
+ * 
+ * @param <V> The result type returned by this Future's {@code get} method
+ * @param <X> The type of the Exception thrown by the Future's 
+ *            {@code checkedGet} method
+ *
+ * @author Anthony Zana
+ * @since 9.0
+ */
+@Beta
+public abstract class ForwardingCheckedFuture<V, X extends Exception> 
+    extends ForwardingListenableFuture<V> implements CheckedFuture<V, X> {
+
+  @Override
+  public V checkedGet() throws X {
+    return delegate().checkedGet();
+  }
+
+  @Override
+  public V checkedGet(long timeout, TimeUnit unit) throws TimeoutException, X {
+    return delegate().checkedGet(timeout, unit);
+  }
+
+  @Override
+  protected abstract CheckedFuture<V, X> delegate();
+
+  // TODO(cpovirk): Use Standard Javadoc form for SimpleForwarding*
+  /**
+   * A simplified version of {@link ForwardingCheckedFuture} where subclasses
+   * can pass in an already constructed {@link CheckedFuture} as the delegate.
+   * 
+   * @since 9.0
+   */
+  @Beta
+  public abstract static class SimpleForwardingCheckedFuture<
+      V, X extends Exception> extends ForwardingCheckedFuture<V, X> {
+    private final CheckedFuture<V, X> delegate;
+
+    protected SimpleForwardingCheckedFuture(CheckedFuture<V, X> delegate) {
+      this.delegate = Preconditions.checkNotNull(delegate);
+    }
+
+    @Override
+    protected final CheckedFuture<V, X> delegate() {
+      return delegate;
+    }
+  }
+}