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// Copyright 2017 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.platform;
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.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.packages.ClassObjectConstructor;
import com.google.devtools.build.lib.packages.NativeClassObjectConstructor;
import com.google.devtools.build.lib.packages.SkylarkClassObject;
import com.google.devtools.build.lib.packages.SkylarkProviderIdentifier;
import com.google.devtools.build.lib.skylarkinterface.SkylarkCallable;
import com.google.devtools.build.lib.skylarkinterface.SkylarkModule;
import com.google.devtools.build.lib.skylarkinterface.SkylarkModuleCategory;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.FunctionSignature;
import com.google.devtools.build.lib.syntax.SkylarkType;
/** Provider for a platform constraint setting that is available to be fulfilled. */
@SkylarkModule(
name = "ConstraintSettingInfo",
doc = "A specific constraint setting that may be used to define a platform.",
category = SkylarkModuleCategory.PROVIDER
)
@Immutable
public class ConstraintSettingInfo extends SkylarkClassObject {
/** Name used in Skylark for accessing this provider. */
public static final String SKYLARK_NAME = "ConstraintSettingInfo";
private static final FunctionSignature.WithValues<Object, SkylarkType> SIGNATURE =
FunctionSignature.WithValues.create(
FunctionSignature.of(
/*numMandatoryPositionals=*/ 1,
/*numOptionalPositionals=*/ 0,
/*numMandatoryNamedOnly*/ 0,
/*starArg=*/ false,
/*kwArg=*/ false,
/*names=*/ "label"),
/*defaultValues=*/ null,
/*types=*/ ImmutableList.<SkylarkType>of(SkylarkType.of(Label.class)));
/** Skylark constructor and identifier for this provider. */
public static final ClassObjectConstructor SKYLARK_CONSTRUCTOR =
new NativeClassObjectConstructor(SKYLARK_NAME, SIGNATURE) {
@Override
protected ConstraintSettingInfo createInstanceFromSkylark(Object[] args, Location loc)
throws EvalException {
// Based on SIGNATURE above, the args are label.
Label label = (Label) args[0];
return ConstraintSettingInfo.create(label, loc);
}
};
/** Identifier used to retrieve this provider from rules which export it. */
public static final SkylarkProviderIdentifier SKYLARK_IDENTIFIER =
SkylarkProviderIdentifier.forKey(SKYLARK_CONSTRUCTOR.getKey());
private final Label label;
private ConstraintSettingInfo(Label label, Location location) {
super(SKYLARK_CONSTRUCTOR, ImmutableMap.<String, Object>of("label", label), location);
this.label = label;
}
@SkylarkCallable(
name = "label",
doc = "The label of the target that created this constraint.",
structField = true
)
public Label label() {
return label;
}
/** Returns a new {@link ConstraintSettingInfo} with the given data. */
public static ConstraintSettingInfo create(Label constraintSetting) {
return create(constraintSetting, Location.BUILTIN);
}
/** Returns a new {@link ConstraintSettingInfo} with the given data. */
public static ConstraintSettingInfo create(Label constraintSetting, Location location) {
return new ConstraintSettingInfo(constraintSetting, location);
}
}
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