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// Copyright 2015 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.actions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import com.google.devtools.build.lib.analysis.config.BuildConfigurationValue.RunfileSymlinksMode;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.util.Collection;
import java.util.Map;
import javax.annotation.Nullable;
/** A {@link RunfilesSupplier} implementation for composing multiple instances. */
public final class CompositeRunfilesSupplier implements RunfilesSupplier {
private final ImmutableList<RunfilesSupplier> suppliers;
/**
* Create a composite {@link RunfilesSupplier} from a collection of suppliers. Suppliers earlier
* in the collection take precedence over later suppliers.
*/
public static RunfilesSupplier fromSuppliers(Collection<RunfilesSupplier> suppliers) {
ImmutableList<RunfilesSupplier> finalSuppliers =
suppliers.stream()
.filter((s) -> s != EmptyRunfilesSupplier.INSTANCE)
.collect(ImmutableList.toImmutableList());
if (finalSuppliers.isEmpty()) {
return EmptyRunfilesSupplier.INSTANCE;
}
if (finalSuppliers.size() == 1) {
return finalSuppliers.get(0);
}
return new CompositeRunfilesSupplier(finalSuppliers);
}
/**
* Convenience method for creating a composite {@link RunfilesSupplier} from two other suppliers.
*/
public static RunfilesSupplier of(RunfilesSupplier supplier1, RunfilesSupplier supplier2) {
return fromSuppliers(ImmutableList.of(supplier1, supplier2));
}
/**
* Create an instance combining all of {@code suppliers}, with earlier elements taking precedence.
*/
private CompositeRunfilesSupplier(ImmutableList<RunfilesSupplier> suppliers) {
this.suppliers = suppliers;
}
@Override
public NestedSet<Artifact> getArtifacts() {
NestedSetBuilder<Artifact> result = NestedSetBuilder.stableOrder();
for (RunfilesSupplier supplier : suppliers) {
result.addTransitive(supplier.getArtifacts());
}
return result.build();
}
@Override
public ImmutableSet<PathFragment> getRunfilesDirs() {
ImmutableSet.Builder<PathFragment> result = ImmutableSet.builder();
for (RunfilesSupplier supplier : suppliers) {
result.addAll(supplier.getRunfilesDirs());
}
return result.build();
}
@Override
public ImmutableMap<PathFragment, Map<PathFragment, Artifact>> getMappings() {
Map<PathFragment, Map<PathFragment, Artifact>> result = Maps.newHashMap();
for (RunfilesSupplier supplier : suppliers) {
Map<PathFragment, Map<PathFragment, Artifact>> mappings = supplier.getMappings();
for (Map.Entry<PathFragment, Map<PathFragment, Artifact>> entry : mappings.entrySet()) {
result.putIfAbsent(entry.getKey(), entry.getValue());
}
}
return ImmutableMap.copyOf(result);
}
@Override
@Nullable
public RunfileSymlinksMode getRunfileSymlinksMode(PathFragment runfilesDir) {
for (RunfilesSupplier supplier : suppliers) {
RunfileSymlinksMode mode = supplier.getRunfileSymlinksMode(runfilesDir);
if (mode != null) {
return mode;
}
}
return null;
}
@Override
public boolean isBuildRunfileLinks(PathFragment runfilesDir) {
for (RunfilesSupplier supplier : suppliers) {
if (supplier.isBuildRunfileLinks(runfilesDir)) {
return true;
}
}
return false;
}
@Override
public RunfilesSupplier withOverriddenRunfilesDir(PathFragment newRunfilesDir) {
throw new UnsupportedOperationException();
}
}