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// Copyright 2018 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.actions;
import com.google.common.base.Preconditions;
import com.google.devtools.build.lib.vfs.FileSystem;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.Root;
import javax.annotation.Nullable;
/**
* An indirection layer on Path resolution of {@link Artifact} and {@link Root}.
*
* <p>Serves as converter interface primarily for switching the {@link FileSystem} underlying the
* values.
*/
public interface ArtifactPathResolver {
/**
* @return a resolved Path corresponding to the given actionInput.
*/
Path toPath(ActionInput actionInput);
/**
* @return a resolved Path corresponding to the given path.
*/
Path convertPath(Path path);
/**
* @return a resolved Rooth corresponding to the given Root.
*/
Root transformRoot(Root root);
ArtifactPathResolver IDENTITY = new IdentityResolver(null);
static ArtifactPathResolver forExecRoot(Path execRoot) {
return new IdentityResolver(execRoot);
}
static ArtifactPathResolver withTransformedFileSystem(Path execRoot) {
return new TransformResolver(execRoot);
}
static ArtifactPathResolver createPathResolver(@Nullable FileSystem fileSystem,
Path execRoot) {
if (fileSystem == null) {
return forExecRoot(execRoot);
} else {
return withTransformedFileSystem(
fileSystem.getPath(execRoot.asFragment()));
}
}
/**
* Path resolution that uses an Artifact's path directly, or looks up the input execPath relative
* to the given execRoot.
*/
class IdentityResolver implements ArtifactPathResolver {
private final Path execRoot;
private IdentityResolver(Path execRoot) {
this.execRoot = execRoot;
}
@Override
public Path toPath(ActionInput actionInput) {
if (actionInput instanceof Artifact) {
return ((Artifact) actionInput).getPath();
}
return execRoot.getRelative(actionInput.getExecPath());
}
@Override
public Root transformRoot(Root root) {
return Preconditions.checkNotNull(root);
}
@Override
public Path convertPath(Path path) {
return path;
}
};
/**
* A resolver that transforms all results to the same filesystem as the given execRoot.
*/
class TransformResolver implements ArtifactPathResolver {
private final FileSystem fileSystem;
private final Path execRoot;
private TransformResolver(Path execRoot) {
this.execRoot = execRoot;
this.fileSystem = Preconditions.checkNotNull(execRoot.getFileSystem());
}
@Override
public Path toPath(ActionInput input) {
if (input instanceof Artifact) {
return fileSystem.getPath(((Artifact) input).getPath().getPathString());
}
return execRoot.getRelative(input.getExecPath());
}
@Override
public Root transformRoot(Root root) {
return Root.toFileSystem(Preconditions.checkNotNull(root), fileSystem);
}
@Override
public Path convertPath(Path path) {
return fileSystem.getPath(path.asFragment());
}
}
}
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