Initial Jack import.

Change-Id: I953cf0a520195a7187d791b2885848ad0d5a9b43

1 files changed, 117 insertions, 0 deletions

diff --git a/guava/src/com/google/common/util/concurrent/AbstractCheckedFuture.java b/guava/src/com/google/common/util/concurrent/AbstractCheckedFuture.java
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+++ b/guava/src/com/google/common/util/concurrent/AbstractCheckedFuture.java
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+/*
+ * Copyright (C) 2008 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 java.util.concurrent.CancellationException;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+/**
+ * A delegating wrapper around a {@link ListenableFuture} that adds support for
+ * the {@link #checkedGet()} and {@link #checkedGet(long, TimeUnit)} methods.
+ *
+ * @author Sven Mawson
+ * @since 1.0
+ */
+@Beta
+public abstract class AbstractCheckedFuture<V, X extends Exception>
+    extends ForwardingListenableFuture.SimpleForwardingListenableFuture<V>
+    implements CheckedFuture<V, X> {
+  /**
+   * Constructs an {@code AbstractCheckedFuture} that wraps a delegate.
+   */
+  protected AbstractCheckedFuture(ListenableFuture<V> delegate) {
+    super(delegate);
+  }
+
+  /**
+   * Translates from an {@link InterruptedException},
+   * {@link CancellationException} or {@link ExecutionException} thrown by
+   * {@code get} to an exception of type {@code X} to be thrown by
+   * {@code checkedGet}. Subclasses must implement this method.
+   *
+   * <p>If {@code e} is an {@code InterruptedException}, the calling
+   * {@code checkedGet} method has already restored the interrupt after catching
+   * the exception. If an implementation of {@link #mapException(Exception)}
+   * wishes to swallow the interrupt, it can do so by calling
+   * {@link Thread#interrupted()}.
+   *
+   * <p>Subclasses may choose to throw, rather than return, a subclass of
+   * {@code RuntimeException} to allow creating a CheckedFuture that throws
+   * both checked and unchecked exceptions.
+   */
+  protected abstract X mapException(Exception e);
+
+  /**
+   * {@inheritDoc}
+   *
+   * <p>This implementation calls {@link #get()} and maps that method's standard
+   * exceptions to instances of type {@code X} using {@link #mapException}.
+   *
+   * <p>In addition, if {@code get} throws an {@link InterruptedException}, this
+   * implementation will set the current thread's interrupt status before
+   * calling {@code mapException}.
+   *
+   * @throws X if {@link #get()} throws an {@link InterruptedException},
+   *         {@link CancellationException}, or {@link ExecutionException}
+   */
+  @Override
+  public V checkedGet() throws X {
+    try {
+      return get();
+    } catch (InterruptedException e) {
+      Thread.currentThread().interrupt();
+      throw mapException(e);
+    } catch (CancellationException e) {
+      throw mapException(e);
+    } catch (ExecutionException e) {
+      throw mapException(e);
+    }
+  }
+
+  /**
+   * {@inheritDoc}
+   *
+   * <p>This implementation calls {@link #get(long, TimeUnit)} and maps that
+   * method's standard exceptions (excluding {@link TimeoutException}, which is
+   * propagated) to instances of type {@code X} using {@link #mapException}.
+   *
+   * <p>In addition, if {@code get} throws an {@link InterruptedException}, this
+   * implementation will set the current thread's interrupt status before
+   * calling {@code mapException}.
+   *
+   * @throws X if {@link #get()} throws an {@link InterruptedException},
+   *         {@link CancellationException}, or {@link ExecutionException}
+   * @throws TimeoutException {@inheritDoc}
+   */
+  @Override
+  public V checkedGet(long timeout, TimeUnit unit) throws TimeoutException, X {
+    try {
+      return get(timeout, unit);
+    } catch (InterruptedException e) {
+      Thread.currentThread().interrupt();
+      throw mapException(e);
+    } catch (CancellationException e) {
+      throw mapException(e);
+    } catch (ExecutionException e) {
+      throw mapException(e);
+    }
+  }
+}