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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.lib.skyframe;
import com.google.common.base.Preconditions;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
/**
* A value that represents the result of looking for the existence of a package that owns a
* specific directory path. Compare with {@link PackageLookupValue}, which deals with existence of
* a specific package.
*/
public abstract class ContainingPackageLookupValue implements SkyValue {
/** Returns whether there is a containing package. */
public abstract boolean hasContainingPackage();
/** If there is a containing package, returns its name. */
public abstract PackageIdentifier getContainingPackageName();
/** If there is a containing package, returns its package root */
public abstract Path getContainingPackageRoot();
public static SkyKey key(PackageIdentifier id) {
Preconditions.checkArgument(!id.getPackageFragment().isAbsolute(), id);
return new SkyKey(SkyFunctions.CONTAINING_PACKAGE_LOOKUP, id);
}
static ContainingPackageLookupValue noContainingPackage() {
return NoContainingPackage.INSTANCE;
}
static ContainingPackageLookupValue withContainingPackage(PackageIdentifier pkgId, Path root) {
return new ContainingPackage(pkgId, root);
}
private static class NoContainingPackage extends ContainingPackageLookupValue {
private static final NoContainingPackage INSTANCE = new NoContainingPackage();
@Override
public boolean hasContainingPackage() {
return false;
}
@Override
public PackageIdentifier getContainingPackageName() {
throw new IllegalStateException();
}
@Override
public Path getContainingPackageRoot() {
throw new IllegalStateException();
}
}
private static class ContainingPackage extends ContainingPackageLookupValue {
private final PackageIdentifier containingPackage;
private final Path containingPackageRoot;
private ContainingPackage(PackageIdentifier pkgId, Path containingPackageRoot) {
this.containingPackage = pkgId;
this.containingPackageRoot = containingPackageRoot;
}
@Override
public boolean hasContainingPackage() {
return true;
}
@Override
public PackageIdentifier getContainingPackageName() {
return containingPackage;
}
@Override
public Path getContainingPackageRoot() {
return containingPackageRoot;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof ContainingPackage)) {
return false;
}
ContainingPackage other = (ContainingPackage) obj;
return containingPackage.equals(other.containingPackage)
&& containingPackageRoot.equals(other.containingPackageRoot);
}
@Override
public int hashCode() {
return containingPackage.hashCode();
}
}
}
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