/*
* 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 com.google.inject.spi;
import com.google.inject.Injector;
import 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 com.google.inject.PrivateModule PrivateModule} for details.
*
* @author jessewilson@google.com (Jesse Wilson)
* @since 2.0
*/
public interface PrivateElements extends Element {
/** Returns the configuration information in this private environment. */
List<Element> 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<Key<?>> 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.
*
* <p>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);
}