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// Copyright 2016 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.cmdline.RepositoryName;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
/**
* A value that represents a local repository lookup result.
*
* <p>Local repository lookups will always produce a value. The {@code #getRepository} method
* returns the name of the repository that the directory resides in.
*/
public abstract class LocalRepositoryLookupValue implements SkyValue {
static SkyKey key(RootedPath directory) {
return SkyKey.create(SkyFunctions.LOCAL_REPOSITORY_LOOKUP, directory);
}
private static final LocalRepositoryLookupValue MAIN_REPO_VALUE = new MainRepositoryLookupValue();
private static final LocalRepositoryLookupValue NOT_FOUND_VALUE =
new NotFoundLocalRepositoryLookupValue();
public static LocalRepositoryLookupValue mainRepository() {
return MAIN_REPO_VALUE;
}
public static LocalRepositoryLookupValue success(RepositoryName repositoryName) {
return new SuccessfulLocalRepositoryLookupValue(repositoryName);
}
public static LocalRepositoryLookupValue notFound() {
return NOT_FOUND_VALUE;
}
/**
* Returns {@code true} if the local repository lookup succeeded and the {@link #getRepository}
* method will return a useful result.
*/
public abstract boolean exists();
/**
* Returns the {@link RepositoryName} of the local repository contained in the directory which was
* looked up, {@link RepositoryName#MAIN} if the directory is part of the main repository, or
* throws a {@link IllegalStateException} if there was no repository found.
*/
public abstract RepositoryName getRepository();
/** Represents a successful lookup of the main repository. */
public static final class MainRepositoryLookupValue extends LocalRepositoryLookupValue {
// This should be a singleton value.
private MainRepositoryLookupValue() {}
@Override
public boolean exists() {
return true;
}
@Override
public RepositoryName getRepository() {
return RepositoryName.MAIN;
}
@Override
public String toString() {
return "MainRepositoryLookupValue";
}
@Override
public boolean equals(Object obj) {
// All MainRepositoryLookupValue instances are equivalent.
return obj instanceof MainRepositoryLookupValue;
}
@Override
public int hashCode() {
return MainRepositoryLookupValue.class.getSimpleName().hashCode();
}
}
/** Represents a successful lookup of a local repository. */
public static final class SuccessfulLocalRepositoryLookupValue
extends LocalRepositoryLookupValue {
private final RepositoryName repositoryName;
public SuccessfulLocalRepositoryLookupValue(RepositoryName repositoryName) {
this.repositoryName = repositoryName;
}
@Override
public boolean exists() {
return true;
}
@Override
public RepositoryName getRepository() {
return repositoryName;
}
@Override
public String toString() {
return "SuccessfulLocalRepositoryLookupValue(" + repositoryName + ")";
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof SuccessfulLocalRepositoryLookupValue)) {
return false;
}
SuccessfulLocalRepositoryLookupValue other = (SuccessfulLocalRepositoryLookupValue) obj;
return repositoryName.equals(other.repositoryName);
}
@Override
public int hashCode() {
return repositoryName.hashCode();
}
}
/** Represents the state where no repository was found, either local or the main repository. */
public static final class NotFoundLocalRepositoryLookupValue extends LocalRepositoryLookupValue {
// This should be a singleton value.
private NotFoundLocalRepositoryLookupValue() {}
@Override
public boolean exists() {
return false;
}
@Override
public RepositoryName getRepository() {
throw new IllegalStateException("Repository was not found");
}
@Override
public String toString() {
return "NotFoundLocalRepositoryLookupValue";
}
@Override
public boolean equals(Object obj) {
// All NotFoundLocalRepositoryLookupValue instances are equivalent.
return obj instanceof NotFoundLocalRepositoryLookupValue;
}
@Override
public int hashCode() {
return NotFoundLocalRepositoryLookupValue.class.getSimpleName().hashCode();
}
}
}
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