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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.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.packages.NoSuchTargetException;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.util.StringCanonicalizer;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.util.Collection;
import java.util.Objects;
import java.util.Set;
import javax.annotation.Nullable;
/**
* A <i>transitive</i> target reference that, when built in skyframe, loads the entire
* transitive closure of a target. Contains no information about the targets traversed.
*/
@Immutable
@ThreadSafe
public class TransitiveTraversalValue implements SkyValue {
@Nullable
private final NoSuchTargetException errorLoadingTarget;
@Nullable
private final ImmutableSet<String> providers;
private TransitiveTraversalValue(@Nullable Iterable<String> providers,
@Nullable NoSuchTargetException errorLoadingTarget) {
this.errorLoadingTarget = errorLoadingTarget;
this.providers = (providers == null) ? null : canonicalSet(providers);
}
public static TransitiveTraversalValue unsuccessfulTransitiveTraversal(
NoSuchTargetException errorLoadingTarget) {
return new TransitiveTraversalValue(null, Preconditions.checkNotNull(errorLoadingTarget));
}
public static TransitiveTraversalValue forTarget(Target target) {
if (target instanceof Rule) {
Rule rule = (Rule) target;
return new TransitiveTraversalValue(
toStringSet(rule.getRuleClassObject().getAdvertisedProviders()), null);
}
return new TransitiveTraversalValue(ImmutableList.<String>of(), null);
}
public static TransitiveTraversalValue withProviders(Collection<String> vals) {
return new TransitiveTraversalValue(ImmutableSet.copyOf(vals), null);
}
private static ImmutableSet<String> canonicalSet(Iterable<String> strIterable) {
ImmutableSet.Builder<String> builder = new ImmutableSet.Builder<>();
for (String str : strIterable) {
builder.add(StringCanonicalizer.intern(str));
}
return builder.build();
}
private static ImmutableSet<String> toStringSet(Iterable<Class<?>> providers) {
ImmutableSet.Builder<String> pBuilder = new ImmutableSet.Builder<>();
if (providers != null) {
for (Class<?> clazz : providers) {
pBuilder.add(StringCanonicalizer.intern(clazz.getName()));
}
}
return pBuilder.build();
}
public Set<String> getProviders() {
return providers;
}
/** Returns the error, if any, from loading the target. */
@Nullable
public NoSuchTargetException getErrorLoadingTarget() {
return errorLoadingTarget;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof TransitiveTraversalValue)) {
return false;
}
TransitiveTraversalValue that = (TransitiveTraversalValue) o;
return Objects.equals(this.errorLoadingTarget, that.errorLoadingTarget)
&& Objects.equals(this.providers, that.providers);
}
@Override
public int hashCode() {
return 31 * Objects.hashCode(errorLoadingTarget) + Objects.hashCode(providers);
}
@ThreadSafe
public static SkyKey key(Label label) {
return new SkyKey(SkyFunctions.TRANSITIVE_TRAVERSAL, label);
}
}
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