// Copyright 2014 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.pkgcache;

import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.NoSuchTargetException;
import com.google.devtools.build.lib.packages.Target;

/**
 * A bridge class that implements the legacy semantics of {@link #getLoadedTarget} using a normal
 * {@link PackageProvider} instance.
 *
 * <p>DO NOT USE! It will be removed when the transition to Skyframe is complete.
 */
public final class LoadedPackageProvider {
  private final PackageProvider packageProvider;
  private final EventHandler eventHandler;

  public LoadedPackageProvider(PackageProvider packageProvider, EventHandler eventHandler) {
    this.packageProvider = packageProvider;
    this.eventHandler = eventHandler;
  }

  public EventHandler getEventHandler() {
    return eventHandler;
  }

  /**
   * Returns a target if it was recently loaded, i.e., since the most recent cache sync. This throws
   * an exception if the target was not loaded or not validated, even if it exists in the
   * surrounding package. If the surrounding package is in error, still attempts to retrieve the
   * target.
   */
  public Target getLoadedTarget(Label label)
      throws NoSuchPackageException, NoSuchTargetException, InterruptedException {
    return packageProvider.getTarget(eventHandler, label);
  }
}
