| // Copyright 2022 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 static com.google.common.base.Preconditions.checkNotNull; |
| |
| import java.util.Iterator; |
| import javax.annotation.Nullable; |
| |
| /** Simple implementation of {@link SkyframeIterableResult}. */ |
| final class SimpleSkyframeIterableResult implements SkyframeIterableResult { |
| private final Iterator<ValueOrUntypedException> valuesOrExceptions; |
| private final Runnable valuesMissingCallback; |
| |
| SimpleSkyframeIterableResult( |
| Runnable valuesMissingCallback, Iterator<ValueOrUntypedException> valuesOrExceptions) { |
| this.valuesMissingCallback = checkNotNull(valuesMissingCallback); |
| this.valuesOrExceptions = checkNotNull(valuesOrExceptions); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return valuesOrExceptions.hasNext(); |
| } |
| |
| @Nullable |
| @Override |
| public <E1 extends Exception, E2 extends Exception, E3 extends Exception, E4 extends Exception> |
| SkyValue nextOrThrow( |
| @Nullable Class<E1> exceptionClass1, |
| @Nullable Class<E2> exceptionClass2, |
| @Nullable Class<E3> exceptionClass3, |
| @Nullable Class<E4> exceptionClass4) |
| throws E1, E2, E3, E4 { |
| ValueOrUntypedException voe = valuesOrExceptions.next(); |
| SkyValue value = voe.getValue(); |
| if (value != null) { |
| return value; |
| } |
| SkyFunctionException.throwIfInstanceOf( |
| voe.getException(), exceptionClass1, exceptionClass2, exceptionClass3, exceptionClass4); |
| valuesMissingCallback.run(); |
| return null; |
| } |
| } |