| // 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.analysis.config; |
| |
| import com.google.common.base.Joiner; |
| import com.google.common.collect.ImmutableCollection; |
| import com.google.devtools.build.lib.analysis.RuleContext; |
| import com.google.devtools.build.lib.analysis.config.transitions.ConfigurationTransition; |
| import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable; |
| import com.google.devtools.build.lib.starlarkbuildapi.FragmentCollectionApi; |
| import javax.annotation.Nullable; |
| import net.starlark.java.eval.EvalException; |
| |
| /** Represents a collection of configuration fragments in Starlark. */ |
| // Documentation can be found at ctx.fragments |
| @Immutable |
| public class FragmentCollection implements FragmentCollectionApi { |
| private final RuleContext ruleContext; |
| private final ConfigurationTransition transition; |
| |
| public FragmentCollection(RuleContext ruleContext, ConfigurationTransition transition) { |
| this.ruleContext = ruleContext; |
| this.transition = transition; |
| } |
| |
| @Override |
| public boolean isImmutable() { |
| return true; // immutable and Starlark-hashable |
| } |
| |
| @Override |
| @Nullable |
| public Object getValue(String name) throws EvalException { |
| return ruleContext.getStarlarkFragment(name, transition); |
| } |
| |
| @Override |
| public ImmutableCollection<String> getFieldNames() { |
| return ruleContext.getStarlarkFragmentNames(transition); |
| } |
| |
| @Override |
| @Nullable |
| public String getErrorMessageForUnknownField(String name) { |
| return String.format( |
| "There is no configuration fragment named '%s' in %s configuration. " |
| + "Available fragments: %s", |
| name, getConfigurationName(transition), fieldsToString()); |
| } |
| |
| private String fieldsToString() { |
| return String.format("'%s'", Joiner.on("', '").join(getFieldNames())); |
| } |
| |
| public static String getConfigurationName(ConfigurationTransition config) { |
| return config.isHostTransition() ? "host" : "target"; |
| } |
| |
| @Override |
| public String toString() { |
| return getConfigurationName(transition) + ": [ " + fieldsToString() + "]"; |
| } |
| } |