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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;
/** Utilities for producing and consuming ValueOrException(2|3|4)? instances. */
@VisibleForTesting
public class ValueOrExceptionUtils {
/** The bottom exception type. */
class BottomException extends Exception {
}
@Nullable
public static SkyValue downconvert(ValueOrException<BottomException> voe) {
return voe.getValue();
}
public static <E1 extends Exception> ValueOrException<E1> downconvert(
ValueOrException2<E1, BottomException> voe, Class<E1> exceptionClass1) {
Exception e = voe.getException();
if (e == null) {
return new ValueOrExceptionValueImpl<>(voe.getValue());
}
// Here and below, we use type-safe casts for performance reasons. Another approach would be
// cascading try-catch-rethrow blocks, but that has a higher performance penalty.
if (exceptionClass1.isInstance(e)) {
return new ValueOrExceptionExnImpl<>(exceptionClass1.cast(e));
}
throw new IllegalStateException("shouldn't reach here " + e.getClass() + " " + exceptionClass1,
e);
}
public static <E1 extends Exception, E2 extends Exception> ValueOrException2<E1, E2> downconvert(
ValueOrException3<E1, E2, BottomException> voe, Class<E1> exceptionClass1,
Class<E2> exceptionClass2) {
Exception e = voe.getException();
if (e == null) {
return new ValueOrException2ValueImpl<>(voe.getValue());
}
if (exceptionClass1.isInstance(e)) {
return new ValueOrException2Exn1Impl<>(exceptionClass1.cast(e));
}
if (exceptionClass2.isInstance(e)) {
return new ValueOrException2Exn2Impl<>(exceptionClass2.cast(e));
}
throw new IllegalStateException("shouldn't reach here " + e.getClass() + " " + exceptionClass1
+ " " + exceptionClass2, e);
}
public static <E1 extends Exception, E2 extends Exception, E3 extends Exception>
ValueOrException3<E1, E2, E3> downconvert(ValueOrException4<E1, E2, E3, BottomException> voe,
Class<E1> exceptionClass1, Class<E2> exceptionClass2, Class<E3> exceptionClass3) {
Exception e = voe.getException();
if (e == null) {
return new ValueOrException3ValueImpl<>(voe.getValue());
}
if (exceptionClass1.isInstance(e)) {
return new ValueOrException3Exn1Impl<>(exceptionClass1.cast(e));
}
if (exceptionClass2.isInstance(e)) {
return new ValueOrException3Exn2Impl<>(exceptionClass2.cast(e));
}
if (exceptionClass3.isInstance(e)) {
return new ValueOrException3Exn3Impl<>(exceptionClass3.cast(e));
}
throw new IllegalStateException("shouldn't reach here " + e.getClass() + " " + exceptionClass1
+ " " + exceptionClass2 + " " + exceptionClass3, e);
}
public static <E extends Exception> ValueOrException<E> ofNull() {
return ValueOrExceptionValueImpl.ofNull();
}
public static ValueOrUntypedException ofValueUntyped(SkyValue value) {
return new ValueOrUntypedExceptionImpl(value);
}
public static <E extends Exception> ValueOrException<E> ofExn(E e) {
return new ValueOrExceptionExnImpl<>(e);
}
public static <E1 extends Exception, E2 extends Exception, E3 extends Exception,
E4 extends Exception> ValueOrException4<E1, E2, E3, E4> ofNullValue() {
return ValueOrException4ValueImpl.ofNullValue();
}
public static <E1 extends Exception, E2 extends Exception, E3 extends Exception,
E4 extends Exception> ValueOrException4<E1, E2, E3, E4> ofValue(SkyValue value) {
return new ValueOrException4ValueImpl<>(value);
}
public static <E1 extends Exception, E2 extends Exception, E3 extends Exception,
E4 extends Exception> ValueOrException4<E1, E2, E3, E4> ofExn1(E1 e) {
return new ValueOrException4Exn1Impl<>(e);
}
public static <E1 extends Exception, E2 extends Exception, E3 extends Exception,
E4 extends Exception> ValueOrException4<E1, E2, E3, E4> ofExn2(E2 e) {
return new ValueOrException4Exn2Impl<>(e);
}
public static <E1 extends Exception, E2 extends Exception, E3 extends Exception,
E4 extends Exception> ValueOrException4<E1, E2, E3, E4> ofExn3(E3 e) {
return new ValueOrException4Exn3Impl<>(e);
}
public static <E1 extends Exception, E2 extends Exception, E3 extends Exception,
E4 extends Exception> ValueOrException4<E1, E2, E3, E4> ofExn4(E4 e) {
return new ValueOrException4Exn4Impl<>(e);
}
private static class ValueOrUntypedExceptionImpl extends ValueOrUntypedException {
@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 ValueOrExceptionValueImpl<E extends Exception> extends ValueOrException<E> {
private static final ValueOrExceptionValueImpl<Exception> NULL =
new ValueOrExceptionValueImpl<Exception>((SkyValue) null);
@Nullable
private final SkyValue value;
private ValueOrExceptionValueImpl(@Nullable SkyValue value) {
this.value = value;
}
@Override
@Nullable
public SkyValue get() {
return value;
}
@Override
@Nullable
public SkyValue getValue() {
return value;
}
@Override
@Nullable
public Exception getException() {
return null;
}
@SuppressWarnings("unchecked")
public static <E extends Exception> ValueOrExceptionValueImpl<E> ofNull() {
return (ValueOrExceptionValueImpl<E>) NULL;
}
}
private static class ValueOrExceptionExnImpl<E extends Exception> extends ValueOrException<E> {
private final E e;
private ValueOrExceptionExnImpl(E e) {
this.e = e;
}
@Override
public SkyValue get() throws E {
throw e;
}
@Override
@Nullable
public SkyValue getValue() {
return null;
}
@Override
public Exception getException() {
return e;
}
}
private static class ValueOrException2ValueImpl<E1 extends Exception, E2 extends Exception>
extends ValueOrException2<E1, E2> {
@Nullable
private final SkyValue value;
ValueOrException2ValueImpl(@Nullable SkyValue value) {
this.value = value;
}
@Override
@Nullable
public SkyValue get() throws E1, E2 {
return value;
}
@Override
@Nullable
public Exception getException() {
return null;
}
@Override
@Nullable
public SkyValue getValue() {
return value;
}
}
private static class ValueOrException2Exn1Impl<E1 extends Exception, E2 extends Exception>
extends ValueOrException2<E1, E2> {
private final E1 e;
private ValueOrException2Exn1Impl(E1 e) {
this.e = e;
}
@Override
public SkyValue get() throws E1 {
throw e;
}
@Override
public Exception getException() {
return e;
}
@Override
@Nullable
public SkyValue getValue() {
return null;
}
}
private static class ValueOrException2Exn2Impl<E1 extends Exception, E2 extends Exception>
extends ValueOrException2<E1, E2> {
private final E2 e;
private ValueOrException2Exn2Impl(E2 e) {
this.e = e;
}
@Override
public SkyValue get() throws E2 {
throw e;
}
@Override
public Exception getException() {
return e;
}
@Override
@Nullable
public SkyValue getValue() {
return null;
}
}
private static class ValueOrException3ValueImpl<E1 extends Exception, E2 extends Exception,
E3 extends Exception> extends ValueOrException3<E1, E2, E3> {
@Nullable
private final SkyValue value;
ValueOrException3ValueImpl(@Nullable SkyValue value) {
this.value = value;
}
@Override
@Nullable
public SkyValue get() throws E1, E2 {
return value;
}
@Override
@Nullable
public Exception getException() {
return null;
}
@Override
@Nullable
public SkyValue getValue() {
return value;
}
}
private static class ValueOrException3Exn1Impl<E1 extends Exception, E2 extends Exception,
E3 extends Exception> extends ValueOrException3<E1, E2, E3> {
private final E1 e;
private ValueOrException3Exn1Impl(E1 e) {
this.e = e;
}
@Override
public SkyValue get() throws E1 {
throw e;
}
@Override
public Exception getException() {
return e;
}
@Override
@Nullable
public SkyValue getValue() {
return null;
}
}
private static class ValueOrException3Exn2Impl<E1 extends Exception, E2 extends Exception,
E3 extends Exception> extends ValueOrException3<E1, E2, E3> {
private final E2 e;
private ValueOrException3Exn2Impl(E2 e) {
this.e = e;
}
@Override
public SkyValue get() throws E2 {
throw e;
}
@Override
public Exception getException() {
return e;
}
@Override
@Nullable
public SkyValue getValue() {
return null;
}
}
private static class ValueOrException3Exn3Impl<E1 extends Exception, E2 extends Exception,
E3 extends Exception> extends ValueOrException3<E1, E2, E3> {
private final E3 e;
private ValueOrException3Exn3Impl(E3 e) {
this.e = e;
}
@Override
public SkyValue get() throws E3 {
throw e;
}
@Override
public Exception getException() {
return e;
}
@Override
@Nullable
public SkyValue getValue() {
return null;
}
}
private static class ValueOrException4ValueImpl<E1 extends Exception, E2 extends Exception,
E3 extends Exception, E4 extends Exception> extends ValueOrException4<E1, E2, E3, E4> {
private static final ValueOrException4ValueImpl<Exception, Exception, Exception,
Exception> NULL = new ValueOrException4ValueImpl<>((SkyValue) null);
@Nullable
private final SkyValue value;
ValueOrException4ValueImpl(@Nullable SkyValue value) {
this.value = value;
}
@Override
@Nullable
public SkyValue get() throws E1, E2 {
return value;
}
@Override
@Nullable
public Exception getException() {
return null;
}
@Override
@Nullable
public SkyValue getValue() {
return value;
}
@SuppressWarnings("unchecked")
private static <E1 extends Exception, E2 extends Exception, E3 extends Exception,
E4 extends Exception>ValueOrException4ValueImpl<E1, E2, E3, E4> ofNullValue() {
return (ValueOrException4ValueImpl<E1, E2, E3, E4>) NULL;
}
}
private static class ValueOrException4Exn1Impl<E1 extends Exception, E2 extends Exception,
E3 extends Exception, E4 extends Exception> extends ValueOrException4<E1, E2, E3, E4> {
private final E1 e;
private ValueOrException4Exn1Impl(E1 e) {
this.e = e;
}
@Override
public SkyValue get() throws E1 {
throw e;
}
@Override
public Exception getException() {
return e;
}
@Override
@Nullable
public SkyValue getValue() {
return null;
}
}
private static class ValueOrException4Exn2Impl<E1 extends Exception, E2 extends Exception,
E3 extends Exception, E4 extends Exception> extends ValueOrException4<E1, E2, E3, E4> {
private final E2 e;
private ValueOrException4Exn2Impl(E2 e) {
this.e = e;
}
@Override
public SkyValue get() throws E2 {
throw e;
}
@Override
public Exception getException() {
return e;
}
@Override
@Nullable
public SkyValue getValue() {
return null;
}
}
private static class ValueOrException4Exn3Impl<E1 extends Exception, E2 extends Exception,
E3 extends Exception, E4 extends Exception> extends ValueOrException4<E1, E2, E3, E4> {
private final E3 e;
private ValueOrException4Exn3Impl(E3 e) {
this.e = e;
}
@Override
public SkyValue get() throws E3 {
throw e;
}
@Override
public Exception getException() {
return e;
}
@Override
@Nullable
public SkyValue getValue() {
return null;
}
}
private static class ValueOrException4Exn4Impl<E1 extends Exception, E2 extends Exception,
E3 extends Exception, E4 extends Exception> extends ValueOrException4<E1, E2, E3, E4> {
private final E4 e;
private ValueOrException4Exn4Impl(E4 e) {
this.e = e;
}
@Override
public SkyValue get() throws E4 {
throw e;
}
@Override
public Exception getException() {
return e;
}
@Override
@Nullable
public SkyValue getValue() {
return null;
}
}
}
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