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/*
 * Copyright (C) 2008 Google Inc.
 *
 * 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 shaded.shaded.com.google.inject.spi;

import shaded.shaded.com.google.inject.Injector;
import shaded.shaded.com.google.inject.Key;
import java.util.List;
import java.util.Set;

/**
 * A private collection of elements that are hidden from the enclosing injector or module by
 * default. See {@link shaded.shaded.com.google.inject.PrivateModule PrivateModule} for details.
 *
 * @author [email protected] (Jesse Wilson)
 * @since 2.0
 */
public interface PrivateElements extends Element {

  /** Returns the configuration information in this private environment. */
  List getElements();

  /**
   * Returns the child injector that hosts these private elements, or null if the elements haven't
   * been used to create an injector.
   */
  Injector getInjector();

  /** Returns the unique exposed keys for these private elements. */
  Set> getExposedKeys();

  /**
   * Returns an arbitrary object containing information about the "place" where this key was
   * exposed. Used by Guice in the production of descriptive error messages.
   *
   * Tools might specially handle types they know about; {@code StackTraceElement} is a good
   * example. Tools should simply call {@code toString()} on the source object if the type is
   * unfamiliar.
   *
   * @param key one of the keys exposed by this module.
   */
  Object getExposedSource(Key key);
}