providertointernalfactoryadapter.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;

/**
 * @author [e-mail] (Bob Lee)
 */
class ProviderToInternalFactoryAdapter<T> implements Provider<T> {

  private final InjectorImpl injector;

  private final InternalFactory<? extends T> internalFactory;

  public ProviderToInternalFactoryAdapter(InjectorImpl injector,
      InternalFactory<? extends T> internalFactory) {
    this.injector = injector;
    this.internalFactory = internalFactory;
  }

  public T get() {
    return injector.callInContext(new ContextualCallable<T>() {
      public T call(InternalContext context) {
        return internalFactory.get(context);
      }
    });
  }

  public String toString() {
    return internalFactory.toString();
  }
}