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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.analysis;
import com.google.common.base.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.configuredtargets.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.util.FileType;
import com.google.devtools.build.lib.util.FileTypeSet;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* Contains a sequence of prerequisite artifacts and supplies methods for filtering and reporting
* errors on those artifacts.
*/
public final class PrerequisiteArtifacts {
private final RuleContext ruleContext;
private final String attributeName;
private final ImmutableList<Artifact> artifacts;
private PrerequisiteArtifacts(
RuleContext ruleContext, String attributeName, ImmutableList<Artifact> artifacts) {
this.ruleContext = Preconditions.checkNotNull(ruleContext);
this.attributeName = Preconditions.checkNotNull(attributeName);
this.artifacts = Preconditions.checkNotNull(artifacts);
}
static PrerequisiteArtifacts get(RuleContext ruleContext, String attributeName, Mode mode) {
Set<Artifact> result = new LinkedHashSet<>();
for (FileProvider target :
ruleContext.getPrerequisites(attributeName, mode, FileProvider.class)) {
Iterables.addAll(result, target.getFilesToBuild());
}
return new PrerequisiteArtifacts(ruleContext, attributeName, ImmutableList.copyOf(result));
}
public static NestedSet<Artifact> nestedSet(RuleContext ruleContext, String attributeName,
Mode mode) {
NestedSetBuilder<Artifact> result = NestedSetBuilder.stableOrder();
for (FileProvider target :
ruleContext.getPrerequisites(attributeName, mode, FileProvider.class)) {
result.addTransitive(target.getFilesToBuild());
}
return result.build();
}
/**
* Returns the artifacts this instance contains in an {@link ImmutableList}.
*/
public ImmutableList<Artifact> list() {
return artifacts;
}
private PrerequisiteArtifacts filter(Predicate<String> fileType, boolean errorsForNonMatching) {
ImmutableList.Builder<Artifact> filtered = new ImmutableList.Builder<>();
for (Artifact artifact : artifacts) {
if (fileType.apply(artifact.getFilename())) {
filtered.add(artifact);
} else if (errorsForNonMatching) {
ruleContext.attributeError(
attributeName,
String.format("%s does not match expected type: %s", artifact, fileType));
}
}
return new PrerequisiteArtifacts(ruleContext, attributeName, filtered.build());
}
/**
* Returns an equivalent instance but only containing artifacts of the given type, reporting
* errors for non-matching artifacts.
*/
public PrerequisiteArtifacts errorsForNonMatching(FileType fileType) {
return filter(fileType, /*errorsForNonMatching=*/true);
}
/**
* Returns an equivalent instance but only containing artifacts of the given types, reporting
* errors for non-matching artifacts.
*/
public PrerequisiteArtifacts errorsForNonMatching(FileTypeSet fileTypeSet) {
return filter(fileTypeSet, /*errorsForNonMatching=*/true);
}
/**
* Returns an equivalent instance but only containing artifacts of the given type.
*/
public PrerequisiteArtifacts filter(FileType fileType) {
return filter(fileType, /*errorsForNonMatching=*/false);
}
/**
* Returns an equivalent instance but only containing artifacts of the given types.
*/
public PrerequisiteArtifacts filter(FileTypeSet fileTypeSet) {
return filter(fileTypeSet, /*errorsForNonMatching=*/false);
}
}
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