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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.collect.ImmutableList;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.TargetParsingException;
import com.google.devtools.build.lib.pkgcache.FilteringPolicy;
import com.google.devtools.build.skyframe.SkyFunction.Environment;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.ValueOrException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Utility class to help with evaluating target patterns.
*/
public class TargetPatternUtil {
/**
* Expand the given {@code targetPatterns}, using the {@code filteringPolicy}. This handles the
* needed underlying Skyframe calls (via {@code env}), and no will return {@code null} to signal a
* Skyframe restart.
*/
@Nullable
public static ImmutableList<Label> expandTargetPatterns(
Environment env, List<String> targetPatterns, FilteringPolicy filteringPolicy)
throws InvalidTargetPatternException, InterruptedException {
// First parse the patterns, and throw any errors immediately.
List<TargetPatternValue.TargetPatternKey> patternKeys = new ArrayList<>();
for (TargetPatternValue.TargetPatternSkyKeyOrException keyOrException :
TargetPatternValue.keys(targetPatterns, filteringPolicy, "")) {
try {
patternKeys.add(keyOrException.getSkyKey());
} catch (TargetParsingException e) {
throw new InvalidTargetPatternException(keyOrException.getOriginalPattern(), e);
}
}
// Then, resolve the patterns.
Map<SkyKey, ValueOrException<TargetParsingException>> resolvedPatterns =
env.getValuesOrThrow(patternKeys, TargetParsingException.class);
boolean valuesMissing = env.valuesMissing();
ImmutableList.Builder<Label> labels = valuesMissing ? null : new ImmutableList.Builder<>();
for (TargetPatternValue.TargetPatternKey pattern : patternKeys) {
TargetPatternValue value;
try {
value = (TargetPatternValue) resolvedPatterns.get(pattern).get();
if (!valuesMissing && value != null) {
labels.addAll(value.getTargets().getTargets());
}
} catch (TargetParsingException e) {
throw new InvalidTargetPatternException(pattern.getPattern(), e);
}
}
if (valuesMissing) {
return null;
}
return labels.build();
}
/**
* Exception used when an error occurs in {@link #expandTargetPatterns(Environment, List,
* FilteringPolicy)}.
*/
static final class InvalidTargetPatternException extends Exception {
private String invalidPattern;
private TargetParsingException tpe;
public InvalidTargetPatternException(String invalidPattern, TargetParsingException tpe) {
super(tpe);
this.invalidPattern = invalidPattern;
this.tpe = tpe;
}
public String getInvalidPattern() {
return invalidPattern;
}
public TargetParsingException getTpe() {
return tpe;
}
}
}
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