| // 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; |
| } |
| } |