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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.NativeInfo;
import com.google.devtools.build.lib.packages.NativeProvider;
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 value that fulfills a {@link ConstraintSettingInfo}. */
@SkylarkModule(
name = "ConstraintValueInfo",
doc = "A value for a constraint setting that can be used to define a platform.",
category = SkylarkModuleCategory.PROVIDER
)
@Immutable
public class ConstraintValueInfo extends NativeInfo {
/** Name used in Skylark for accessing this provider. */
public static final String SKYLARK_NAME = "ConstraintValueInfo";
private static final FunctionSignature.WithValues<Object, SkylarkType> SIGNATURE =
FunctionSignature.WithValues.create(
FunctionSignature.of(
/*numMandatoryPositionals=*/ 2,
/*numOptionalPositionals=*/ 0,
/*numMandatoryNamedOnly*/ 0,
/*starArg=*/ false,
/*kwArg=*/ false,
/*names=*/ "label",
"constraint_setting"),
/*defaultValues=*/ null,
/*types=*/ ImmutableList.<SkylarkType>of(
SkylarkType.of(Label.class), SkylarkType.of(ConstraintSettingInfo.class)));
/** Skylark constructor and identifier for this provider. */
public static final NativeProvider<ConstraintValueInfo> SKYLARK_CONSTRUCTOR =
new NativeProvider<ConstraintValueInfo>(ConstraintValueInfo.class, SKYLARK_NAME, SIGNATURE) {
@Override
protected ConstraintValueInfo createInstanceFromSkylark(Object[] args, Location loc)
throws EvalException {
// Based on SIGNATURE above, the args are label, constraint_setting.
Label label = (Label) args[0];
ConstraintSettingInfo constraint = (ConstraintSettingInfo) args[1];
return ConstraintValueInfo.create(constraint, label, loc);
}
};
private final ConstraintSettingInfo constraint;
private final Label label;
private ConstraintValueInfo(ConstraintSettingInfo constraint, Label label, Location location) {
super(
SKYLARK_CONSTRUCTOR,
ImmutableMap.<String, Object>of(
"constraint", constraint,
"label", label),
location);
this.constraint = constraint;
this.label = label;
}
@SkylarkCallable(
name = "constraint",
doc =
"The <a href=\"ConstraintSettingInfo.html\">ConstraintSettingInfo</a> this value can be "
+ "applied to.",
structField = true
)
public ConstraintSettingInfo constraint() {
return constraint;
}
@SkylarkCallable(
name = "label",
doc = "The label of the target that created this constraint value.",
structField = true
)
public Label label() {
return label;
}
/** Returns a new {@link ConstraintValueInfo} with the given data. */
public static ConstraintValueInfo create(ConstraintSettingInfo constraint, Label value) {
return create(constraint, value, Location.BUILTIN);
}
/** Returns a new {@link ConstraintValueInfo} with the given data. */
public static ConstraintValueInfo create(
ConstraintSettingInfo constraint, Label value, Location location) {
return new ConstraintValueInfo(constraint, value, location);
}
}
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