| // 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.vfs.RootedPath; |
| import com.google.devtools.build.skyframe.SkyFunction; |
| import com.google.devtools.build.skyframe.SkyFunctionException; |
| import com.google.devtools.build.skyframe.SkyKey; |
| import java.io.IOException; |
| |
| /** |
| * A {@link SkyFunction} for {@link DirectoryListingStateValue}s. |
| * |
| * <p>Merely calls DirectoryListingStateValue#create, but also has special handling for |
| * directories outside the package roots (see {@link ExternalFilesHelper}). |
| */ |
| public class DirectoryListingStateFunction implements SkyFunction { |
| |
| private final ExternalFilesHelper externalFilesHelper; |
| |
| public DirectoryListingStateFunction(ExternalFilesHelper externalFilesHelper) { |
| this.externalFilesHelper = externalFilesHelper; |
| } |
| |
| @Override |
| public DirectoryListingStateValue compute(SkyKey skyKey, Environment env) |
| throws DirectoryListingStateFunctionException, InterruptedException { |
| RootedPath dirRootedPath = (RootedPath) skyKey.argument(); |
| |
| try { |
| externalFilesHelper.maybeHandleExternalFile(dirRootedPath, env); |
| if (env.valuesMissing()) { |
| return null; |
| } |
| return DirectoryListingStateValue.create(dirRootedPath); |
| } catch (ExternalFilesHelper.NonexistentImmutableExternalFileException e) { |
| // DirectoryListingStateValue.key assumes the path exists. This exception here is therefore |
| // indicative of a programming bug. |
| throw new IllegalStateException(dirRootedPath.toString(), e); |
| } catch (IOException e) { |
| throw new DirectoryListingStateFunctionException(e); |
| } |
| } |
| |
| @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 DirectoryListingStateFunction#compute}. |
| */ |
| private static final class DirectoryListingStateFunctionException |
| extends SkyFunctionException { |
| public DirectoryListingStateFunctionException(IOException e) { |
| super(e, Transience.TRANSIENT); |
| } |
| } |
| } |