| // 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.lib.skyframe; |
| |
| import com.google.devtools.build.lib.actions.FileValue; |
| import com.google.devtools.build.lib.actions.InconsistentFilesystemException; |
| import com.google.devtools.build.lib.vfs.RootedPath; |
| import com.google.devtools.build.skyframe.SkyFunction; |
| import com.google.devtools.build.skyframe.SkyFunctionException; |
| import com.google.devtools.build.skyframe.SkyKey; |
| import com.google.devtools.build.skyframe.SkyValue; |
| import javax.annotation.Nullable; |
| |
| /** |
| * A {@link SkyFunction} for {@link DirectoryListingValue}s. |
| */ |
| public final class DirectoryListingFunction implements SkyFunction { |
| |
| @Override |
| public SkyValue compute(SkyKey skyKey, Environment env) |
| throws DirectoryListingFunctionException, InterruptedException { |
| RootedPath dirRootedPath = (RootedPath) skyKey.argument(); |
| |
| FileValue dirFileValue = (FileValue) env.getValue(FileValue.key(dirRootedPath)); |
| if (dirFileValue == null) { |
| return null; |
| } |
| |
| RootedPath realDirRootedPath = dirFileValue.realRootedPath(); |
| if (!dirFileValue.isDirectory()) { |
| // Recall that the directory is assumed to exist (see DirectoryListingValue#key). |
| throw new DirectoryListingFunctionException(new InconsistentFilesystemException( |
| dirRootedPath.asPath() + " is no longer an existing directory. Did you delete it during " |
| + "the build?")); |
| } |
| |
| DirectoryListingStateValue directoryListingStateValue = |
| (DirectoryListingStateValue) env.getValue(DirectoryListingStateValue.key( |
| realDirRootedPath)); |
| if (directoryListingStateValue == null) { |
| return null; |
| } |
| |
| return DirectoryListingValue.value(dirRootedPath, dirFileValue, directoryListingStateValue); |
| } |
| |
| @Nullable |
| @Override |
| public String extractTag(SkyKey skyKey) { |
| return null; |
| } |
| |
| /** |
| * Used to declare all the exception types that can be wrapped in the exception thrown by |
| * {@link DirectoryListingFunction#compute}. |
| */ |
| private static final class DirectoryListingFunctionException extends SkyFunctionException { |
| public DirectoryListingFunctionException(InconsistentFilesystemException e) { |
| super(e, Transience.TRANSIENT); |
| } |
| } |
| } |