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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.skyframe;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
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.serialization.autocodec.AutoCodec;
import com.google.devtools.build.skyframe.AbstractSkyKey;
import com.google.devtools.build.skyframe.SkyFunctionName;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.util.Objects;
/**
* A value that represents the 'mappings' of an external Bazel workspace, as defined
* in the main WORKSPACE file. The SkyValue contains the mappings themselves, with the key being
* the name of the external repository.
*
* <p>Given the following rule:
* <pre>{@code
* local_repository(
* name = “a”,
* path = “../a”,
* repo_mapping = {“@x” : “@y”}
* )
* }</pre>
*
* <p>The SkyKey would be {@code "@a"} and the SkyValue would be the map {@code {"@x" : "@y"}}
*
* <p>This is kept as a separate value with trivial change pruning so as to not necessitate a
* dependency from every {@link PackageValue} to the //external {@link PackageValue}, so that
* changes to things in the WORKSPACE other than the mappings (and name) won't require reloading
* all packages. If the mappings are changed then the external packages need to be reloaded.
*/
public class RepositoryMappingValue implements SkyValue {
private final ImmutableMap<RepositoryName, RepositoryName> repositoryMapping;
private RepositoryMappingValue(ImmutableMap<RepositoryName, RepositoryName> repositoryMapping) {
Preconditions.checkNotNull(repositoryMapping);
this.repositoryMapping = repositoryMapping;
}
/** Returns the workspace mappings. */
public ImmutableMap<RepositoryName, RepositoryName> getRepositoryMapping() {
return repositoryMapping;
}
/** Returns the {@link Key} for {@link RepositoryMappingValue}s. */
public static Key key(RepositoryName repositoryName) {
return RepositoryMappingValue.Key.create(repositoryName);
}
/** Returns a {@link RepositoryMappingValue} for a workspace with the given name. */
public static RepositoryMappingValue withMapping(
ImmutableMap<RepositoryName, RepositoryName> repositoryMapping) {
return new RepositoryMappingValue(Preconditions.checkNotNull(repositoryMapping));
}
@Override
public boolean equals(Object o) {
if (!(o instanceof RepositoryMappingValue)) {
return false;
}
RepositoryMappingValue other = (RepositoryMappingValue) o;
return Objects.equals(repositoryMapping, other.repositoryMapping);
}
@Override
public int hashCode() {
return Objects.hash(repositoryMapping);
}
@Override
public String toString() {
return repositoryMapping.toString();
}
/** {@link SkyKey} for {@link RepositoryMappingValue}. */
@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_MAPPING;
}
}
}
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