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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.rules.repository;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import com.google.common.collect.Interner;
import com.google.devtools.build.lib.cmdline.RepositoryName;
import com.google.devtools.build.lib.concurrent.BlazeInterners;
import com.google.devtools.build.lib.skyframe.DirectoryListingValue;
import com.google.devtools.build.lib.skyframe.SkyFunctions;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.skyframe.AbstractSkyKey;
import com.google.devtools.build.skyframe.SkyFunctionName;
import com.google.devtools.build.skyframe.SkyValue;
import java.util.Arrays;
import javax.annotation.Nullable;
/** A local view of an external repository. */
public abstract class RepositoryDirectoryValue implements SkyValue {
/**
* Returns whether the repository exists or not. If this return false, then the methods below will
* throw.
*/
public abstract boolean repositoryExists();
/**
* Returns the path to the directory containing the repository's contents. This directory is
* guaranteed to exist. It may contain a full Bazel repository (with a WORKSPACE file,
* directories, and BUILD files) or simply contain a file (or set of files) for, say, a jar from
* Maven.
*/
public abstract Path getPath();
public abstract boolean isFetchingDelayed();
/** Represents a successful repository lookup. */
public static final class SuccessfulRepositoryDirectoryValue extends RepositoryDirectoryValue {
private final Path path;
private final boolean fetchingDelayed;
@Nullable private final byte[] digest;
@Nullable private final DirectoryListingValue sourceDir;
private SuccessfulRepositoryDirectoryValue(
Path path, boolean fetchingDelayed, DirectoryListingValue sourceDir, byte[] digest) {
this.path = path;
this.fetchingDelayed = fetchingDelayed;
this.sourceDir = sourceDir;
this.digest = digest;
}
@Override
public boolean repositoryExists() {
return true;
}
@Override
public Path getPath() {
return path;
}
@Override
public boolean isFetchingDelayed() {
return fetchingDelayed;
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (other instanceof SuccessfulRepositoryDirectoryValue) {
SuccessfulRepositoryDirectoryValue otherValue = (SuccessfulRepositoryDirectoryValue) other;
return Objects.equal(path, otherValue.path)
&& Objects.equal(sourceDir, otherValue.sourceDir)
&& Arrays.equals(digest, otherValue.digest);
}
return false;
}
@Override
public int hashCode() {
return Objects.hashCode(path, sourceDir, Arrays.hashCode(digest));
}
@Override
public String toString() {
return path.getPathString();
}
}
/** Represents an unsuccessful repository lookup. */
public static final class NoRepositoryDirectoryValue extends RepositoryDirectoryValue {
private NoRepositoryDirectoryValue() {}
@Override
public boolean repositoryExists() {
return false;
}
@Override
public Path getPath() {
throw new IllegalStateException();
}
@Override
public boolean isFetchingDelayed() {
throw new IllegalStateException();
}
}
public static final NoRepositoryDirectoryValue NO_SUCH_REPOSITORY_VALUE =
new NoRepositoryDirectoryValue();
/** Creates a key from the given repository name. */
public static Key key(RepositoryName repository) {
return Key.create(repository);
}
@AutoCodec.VisibleForSerialization
@AutoCodec
static class Key extends AbstractSkyKey<RepositoryName> {
private static final Interner<Key> interner = BlazeInterners.newWeakInterner();
private Key(RepositoryName arg) {
super(arg);
}
@AutoCodec.VisibleForSerialization
@AutoCodec.Instantiator
static Key create(RepositoryName arg) {
return interner.intern(new Key(arg));
}
@Override
public SkyFunctionName functionName() {
return SkyFunctions.REPOSITORY_DIRECTORY;
}
}
public static Builder builder() {
return new Builder();
}
/** A builder to create a {@link RepositoryDirectoryValue}. */
public static class Builder {
private Path path = null;
private boolean fetchingDelayed = false;
private byte[] digest = null;
private DirectoryListingValue sourceDir = null;
private Builder() {}
public Builder setPath(Path path) {
this.path = path;
return this;
}
public Builder setFetchingDelayed() {
this.fetchingDelayed = true;
return this;
}
public Builder setDigest(byte[] digest) {
this.digest = digest;
return this;
}
public Builder setSourceDir(DirectoryListingValue sourceDir) {
this.sourceDir = sourceDir;
return this;
}
public SuccessfulRepositoryDirectoryValue build() {
Preconditions.checkNotNull(path, "Repository path must be specified!");
// Only if fetching is delayed then we are allowed to have a null digest.
if (!this.fetchingDelayed) {
Preconditions.checkNotNull(digest, "Repository marker digest must be specified!");
}
return new SuccessfulRepositoryDirectoryValue(path, fetchingDelayed, sourceDir, digest);
}
}
}
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