// 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.skylarkbuildapi.FragmentCollectionApi; import javax.annotation.Nullable; /** Represents a collection of configuration fragments in Skylark. */ // 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 @Nullable public Object getValue(String name) { return ruleContext.getSkylarkFragment(name, transition); } @Override public ImmutableCollection getFieldNames() { return ruleContext.getSkylarkFragmentNames(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() + "]"; } }