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// Copyright 2016 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.devtools.build.lib.packages.DependencyFilter.AttributeInfoProvider;
import com.google.devtools.build.lib.syntax.Type.LabelClass;
import com.google.devtools.build.lib.util.BinaryPredicate;
/**
* A predicate that returns true if an dependency attribute should be included in the result of
* <code>blaze query</code>.
* Used to implement <code>--[no]implicit_deps</code>, <code>--[no]host_deps</code> etc.
*/
public abstract class DependencyFilter
implements BinaryPredicate<AttributeInfoProvider, Attribute> {
/** Dependency predicate that includes all dependencies */
public static final DependencyFilter ALL_DEPS =
new DependencyFilter() {
@Override
public boolean apply(AttributeInfoProvider x, Attribute y) {
return true;
}
};
/** Dependency predicate that excludes host dependencies */
public static final DependencyFilter NO_HOST_DEPS =
new DependencyFilter() {
@Override
public boolean apply(AttributeInfoProvider infoProvider, Attribute attribute) {
// getConfigurationTransition() is only defined for labels which introduce a dependency.
if (attribute.getType().getLabelClass() != LabelClass.DEPENDENCY) {
return true;
}
return !attribute.getConfigurationTransition().isHostTransition();
}
};
/** Dependency predicate that excludes implicit dependencies */
public static final DependencyFilter NO_IMPLICIT_DEPS =
new DependencyFilter() {
@Override
public boolean apply(AttributeInfoProvider infoProvider, Attribute attribute) {
return infoProvider.isAttributeValueExplicitlySpecified(attribute);
}
};
/**
* Dependency predicate that excludes those edges that are not present in
* the loading phase target dependency graph.
*/
public static final DependencyFilter NO_NODEP_ATTRIBUTES =
new DependencyFilter() {
@Override
public boolean apply(AttributeInfoProvider infoProvider, Attribute attribute) {
return attribute.getType().getLabelClass() != LabelClass.NONDEP_REFERENCE;
}
};
/**
* Checks to see if the attribute has the isDirectCompileTimeInput property.
*/
public static final DependencyFilter DIRECT_COMPILE_TIME_INPUT =
new DependencyFilter() {
@Override
public boolean apply(AttributeInfoProvider infoProvider, Attribute attribute) {
return attribute.isDirectCompileTimeInput();
}
};
/**
* Returns true if a given attribute should be processed.
*/
@Override
public abstract boolean apply(AttributeInfoProvider infoProvider, Attribute attribute);
/**
* Returns a predicate that computes the logical and of the two given predicates.
*/
public static DependencyFilter and(
final DependencyFilter a, final DependencyFilter b) {
return new DependencyFilter() {
@Override
public boolean apply(AttributeInfoProvider infoProvider, Attribute attribute) {
return a.apply(infoProvider, attribute) && b.apply(infoProvider, attribute);
}
};
}
/**
* Interface to provide information about attributes to dependency filters.
*/
public interface AttributeInfoProvider {
/**
* Returns true iff the value of the specified attribute is explicitly set in
* the BUILD file (as opposed to its default value). This also returns true if
* the value from the BUILD file is the same as the default value.
*/
boolean isAttributeValueExplicitlySpecified(Attribute attribute);
}
}
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