context.java

Guice是轻量级的依赖注入框架。简而言之

/**
 * Copyright (C) 2006 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;

import java.lang.reflect.Member;

/**
 * Context of the current injection.
 *
 * @author [e-mail] (Bob Lee)
 */
interface Context {

  /**
   * Gets the {@link Injector}.
   */
  Injector getInjector();

  /**
   * Gets the field, method or constructor which is being injected. Returns
   * {@code null} if the object isn't being injected into anywhere (i.e. it's
   * preloaded, returned from {@link Provider#get()}, etc.).
   */
  Member getMember();

  /**
   * Gets the index of the parameter which is being injected. Returns {@code -1}
   * if a parameter isn't being injected.
   */
  int getParameterIndex();

  /**
   * Gets the binding key for the object currently being retrieved.
   */
  Key<?> getKey();
}