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// Copyright 2015 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.util.Preconditions;
import java.util.Objects;
/**
* Wrapper around {@link AspectClass} class and {@link AspectParameters}. Aspects are
* created with help of aspect factory instances and parameters are used to configure them, so we
* have to keep them together.
*/
public final class Aspect implements DependencyFilter.AttributeInfoProvider {
// TODO(bazel-team): class objects are not really hashable or comparable for equality other than
// by reference. We should identify the aspect here in a way that does not rely on comparison
// by reference so that keys can be serialized and deserialized properly.
private final AspectClass aspectClass;
private final AspectParameters parameters;
public Aspect(AspectClass aspect, AspectParameters parameters) {
Preconditions.checkNotNull(aspect);
Preconditions.checkNotNull(parameters);
this.aspectClass = aspect;
this.parameters = parameters;
}
public Aspect(AspectClass aspect) {
this(aspect, AspectParameters.EMPTY);
}
/**
* Returns the aspectClass required for building the aspect.
*/
public AspectClass getAspectClass() {
return aspectClass;
}
/**
* Returns parameters for evaluation of the aspect.
*/
public AspectParameters getParameters() {
return parameters;
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof Aspect)) {
return false;
}
Aspect that = (Aspect) other;
return Objects.equals(this.aspectClass, that.aspectClass)
&& Objects.equals(this.parameters, that.parameters);
}
@Override
public int hashCode() {
return Objects.hash(aspectClass, parameters);
}
@Override
public String toString() {
return String.format("Aspect %s(%s)", aspectClass, parameters);
}
public AspectDefinition getDefinition() {
return aspectClass.getDefinition(parameters);
}
@Override
public boolean isAttributeValueExplicitlySpecified(Attribute attribute) {
// All aspect attributes are implicit.
return false;
}
}
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