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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.common.collect.ImmutableMultimap;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.protobuf.TextFormat;
import java.util.Map;
import java.util.Objects;
/**
* A pair of {@link AspectClass} and {@link AspectParameters}.
*
* <p>Used for dependency resolution.
*/
@Immutable
@AutoCodec
public final class AspectDescriptor {
private final AspectClass aspectClass;
private final AspectParameters aspectParameters;
@AutoCodec.Instantiator
public AspectDescriptor(AspectClass aspectClass, AspectParameters aspectParameters) {
this.aspectClass = aspectClass;
this.aspectParameters = aspectParameters;
}
public AspectDescriptor(AspectClass aspectClass) {
this(aspectClass, AspectParameters.EMPTY);
}
public AspectClass getAspectClass() {
return aspectClass;
}
public AspectParameters getParameters() {
return aspectParameters;
}
@Override
public int hashCode() {
return Objects.hash(aspectClass, aspectParameters);
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof AspectDescriptor)) {
return false;
}
AspectDescriptor that = (AspectDescriptor) obj;
return Objects.equals(aspectClass, that.aspectClass)
&& Objects.equals(aspectParameters, that.aspectParameters);
}
@Override
public String toString() {
return getDescription();
}
/**
* Creates a presentable description of this aspect, avaliable
* to Skylark via "Target.aspects".
*
* The description is designed to be unique for each aspect descriptor,
* but not to be parseable.
*/
public String getDescription() {
if (aspectParameters.isEmpty()) {
return aspectClass.getName();
}
StringBuilder builder = new StringBuilder(aspectClass.getName());
builder.append('[');
ImmutableMultimap<String, String> attributes = aspectParameters.getAttributes();
boolean first = true;
for (Map.Entry<String, String> attribute : attributes.entries()) {
if (!first) {
builder.append(',');
} else {
first = false;
}
builder.append(attribute.getKey());
builder.append("=\"");
builder.append(TextFormat.escapeDoubleQuotesAndBackslashes(attribute.getValue()));
builder.append("\"");
}
builder.append(']');
return builder.toString();
}
}
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