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Java example source code file (Guice.java)

This example Java source code file (Guice.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

guice, injector, internalinjectorcreator, iterable, module, util

The Guice.java Java example source code

/*
 * Copyright (C) 2007 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 com.google.inject.internal.InternalInjectorCreator;

import java.util.Arrays;

/**
 * The entry point to the Guice framework. Creates {@link Injector}s from
 * {@link Module}s.
 *
 * <p>Guice supports a model of development that draws clear boundaries between
 * APIs, Implementations of these APIs, Modules which configure these
 * implementations, and finally Applications which consist of a collection of
 * Modules. It is the Application, which typically defines your {@code main()}
 * method, that bootstraps the Guice Injector using the {@code Guice} class, as
 * in this example:
 * <pre>
 *     public class FooApplication {
 *       public static void main(String[] args) {
 *         Injector injector = Guice.createInjector(
 *             new ModuleA(),
 *             new ModuleB(),
 *             . . .
 *             new FooApplicationFlagsModule(args)
 *         );
 *
 *         // Now just bootstrap the application and you're done
 *         FooStarter starter = injector.getInstance(FooStarter.class);
 *         starter.runApplication();
 *       }
 *     }
 * </pre>
 */
public final class Guice {

  private Guice() {}

  /**
   * Creates an injector for the given set of modules. This is equivalent to
   * calling {@link #createInjector(Stage, Module...)} with Stage.DEVELOPMENT.
   *
   * @throws CreationException if one or more errors occur during injector
   *     construction
   */
  public static Injector createInjector(Module... modules) {
    return createInjector(Arrays.asList(modules));
  }

  /**
   * Creates an injector for the given set of modules. This is equivalent to
   * calling {@link #createInjector(Stage, Iterable)} with Stage.DEVELOPMENT.
   *
   * @throws CreationException if one or more errors occur during injector
   *     creation
   */
  public static Injector createInjector(Iterable<? extends Module> modules) {
    return createInjector(Stage.DEVELOPMENT, modules);
  }

  /**
   * Creates an injector for the given set of modules, in a given development
   * stage.
   *
   * @throws CreationException if one or more errors occur during injector
   *     creation.
   */
  public static Injector createInjector(Stage stage, Module... modules) {
    return createInjector(stage, Arrays.asList(modules));
  }

  /**
   * Creates an injector for the given set of modules, in a given development
   * stage.
   *
   * @throws CreationException if one or more errors occur during injector
   *     construction
   */
  public static Injector createInjector(Stage stage,
      Iterable<? extends Module> modules) {
    return new InternalInjectorCreator()
        .stage(stage)
        .addModules(modules)
        .build();
  }
}

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