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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.skyframe;
import com.google.common.annotations.VisibleForTesting;
import javax.annotation.Nullable;
/**
* Wrapper for a value or the untyped exception thrown when trying to compute it.
*
* <p>This is an implementation detail of {@link ParallelEvaluator}. It's an abstract class (as
* opposed to an interface) to avoid exposing the methods outside the package.
*/
@VisibleForTesting
public abstract class ValueOrUntypedException {
/** Returns the stored value, if there was one. */
@Nullable
abstract SkyValue getValue();
/** Returns the stored exception, if there was one. */
@Nullable
abstract Exception getException();
public static ValueOrUntypedException ofValueUntyped(SkyValue value) {
return new ValueOrUntypedExceptionImpl(value);
}
public static ValueOrUntypedException ofNull() {
return ValueOrUntypedExceptionImpl.NULL;
}
public static ValueOrUntypedException ofExn(Exception e) {
return new ValueOrUntypedExceptionExnImpl(e);
}
private static class ValueOrUntypedExceptionImpl extends ValueOrUntypedException {
static final ValueOrUntypedExceptionImpl NULL = new ValueOrUntypedExceptionImpl(null);
@Nullable private final SkyValue value;
ValueOrUntypedExceptionImpl(@Nullable SkyValue value) {
this.value = value;
}
@Override
@Nullable
public SkyValue getValue() {
return value;
}
@Override
public Exception getException() {
return null;
}
}
private static class ValueOrUntypedExceptionExnImpl extends ValueOrUntypedException {
private final Exception exception;
ValueOrUntypedExceptionExnImpl(Exception exception) {
this.exception = exception;
}
@Override
@Nullable
public SkyValue getValue() {
return null;
}
@Override
public Exception getException() {
return exception;
}
}
}
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