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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.packages;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.LabelSyntaxException;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.devtools.build.lib.syntax.EvalException;
import java.io.Serializable;
import java.util.Collections;
import java.util.List;
/**
* A rule visibility that simply says yes or no. It corresponds to public,
* legacy_public and private visibilities.
*/
@Immutable @ThreadSafe
public class ConstantRuleVisibility implements RuleVisibility, Serializable {
@AutoCodec
static final Label LEGACY_PUBLIC_LABEL; // same as "public"; used for automated depot cleanup
@AutoCodec @AutoCodec.VisibleForSerialization static final Label PUBLIC_LABEL;
@AutoCodec @AutoCodec.VisibleForSerialization static final Label PRIVATE_LABEL;
@AutoCodec public static final ConstantRuleVisibility PUBLIC = new ConstantRuleVisibility(true);
@AutoCodec public static final ConstantRuleVisibility PRIVATE = new ConstantRuleVisibility(false);
static {
try {
PUBLIC_LABEL = Label.parseAbsolute("//visibility:public", ImmutableMap.of());
LEGACY_PUBLIC_LABEL = Label.parseAbsolute("//visibility:legacy_public", ImmutableMap.of());
PRIVATE_LABEL = Label.parseAbsolute("//visibility:private", ImmutableMap.of());
} catch (LabelSyntaxException e) {
throw new IllegalStateException();
}
}
private final boolean result;
public ConstantRuleVisibility(boolean result) {
this.result = result;
}
public boolean isPubliclyVisible() {
return result;
}
@Override
public List<Label> getDependencyLabels() {
return Collections.emptyList();
}
@Override
public List<Label> getDeclaredLabels() {
return ImmutableList.of(result ? PUBLIC_LABEL : PRIVATE_LABEL);
}
/**
* Tries to parse a list of labels into a {@link ConstantRuleVisibility}.
*
* @param labels the list of labels to parse
* @return The resulting visibility object, or null if the list of labels
* could not be parsed.
*/
public static ConstantRuleVisibility tryParse(List<Label> labels) throws EvalException {
if (labels.size() == 1) {
return tryParse(labels.get(0));
}
ConstantRuleVisibility visibility;
for (Label label : labels) {
visibility = tryParse(label);
if (visibility != null) {
throw new EvalException(null,
"Public or private visibility labels (e.g. //visibility:public or" +
" //visibility:private) cannot be used in combination with other labels");
}
}
return null;
}
public static ConstantRuleVisibility tryParse(Label label) {
if (PUBLIC_LABEL.equals(label) || LEGACY_PUBLIC_LABEL.equals(label)) {
return PUBLIC;
} else if (PRIVATE_LABEL.equals(label)) {
return PRIVATE;
} else {
return null;
}
}
}
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