// 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;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.syntax.EvalException;


/**
 * Utility class to validate results of executing Skylark rules and aspects.
 */
public class SkylarkProviderValidationUtil {
  public static void checkOrphanArtifacts(RuleContext ruleContext) throws EvalException {
    ImmutableSet<Artifact> orphanArtifacts =
        ruleContext.getAnalysisEnvironment().getOrphanArtifacts();
    if (!orphanArtifacts.isEmpty()) {
      throw new EvalException(null, "The following files have no generating action:\n"
          + Joiner.on("\n").join(Iterables.transform(orphanArtifacts,
          new Function<Artifact, String>() {
            @Override
            public String apply(Artifact artifact) {
              return artifact.getRootRelativePathString();
            }
          })));
    }
  }
}