| // 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 static com.google.common.base.Preconditions.checkNotNull; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.collect.ImmutableMultimap; |
| import com.google.common.collect.Interner; |
| import com.google.devtools.build.lib.concurrent.BlazeInterners; |
| import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable; |
| import com.google.devtools.build.lib.util.HashCodes; |
| import com.google.protobuf.TextFormat; |
| import java.util.Map; |
| |
| /** |
| * A pair of {@link AspectClass} and {@link AspectParameters}. |
| * |
| * <p>Used for dependency resolution. |
| */ |
| @Immutable |
| public final class AspectDescriptor { |
| |
| private static final Interner<AspectDescriptor> interner = BlazeInterners.newWeakInterner(); |
| |
| @VisibleForTesting |
| public static AspectDescriptor of(AspectClass aspectClass, AspectParameters aspectParameters) { |
| return interner.intern(new AspectDescriptor(aspectClass, aspectParameters)); |
| } |
| |
| private final AspectClass aspectClass; |
| private final AspectParameters aspectParameters; |
| |
| private AspectDescriptor(AspectClass aspectClass, AspectParameters aspectParameters) { |
| this.aspectClass = checkNotNull(aspectClass); |
| this.aspectParameters = checkNotNull(aspectParameters); |
| } |
| |
| public AspectClass getAspectClass() { |
| return aspectClass; |
| } |
| |
| public AspectParameters getParameters() { |
| return aspectParameters; |
| } |
| |
| @Override |
| public int hashCode() { |
| return HashCodes.hashObjects(aspectClass, aspectParameters); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| |
| if (!(obj instanceof AspectDescriptor)) { |
| return false; |
| } |
| |
| AspectDescriptor that = (AspectDescriptor) obj; |
| return aspectClass.equals(that.aspectClass) && aspectParameters.equals(that.aspectParameters); |
| } |
| |
| @Override |
| public String toString() { |
| return getDescription(); |
| } |
| |
| /** |
| * Creates a presentable description of this aspect, available to Starlark via "Target.aspects". |
| * |
| * <p>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(); |
| } |
| } |