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Java example source code file (ModulesTest.java)

This example Java source code file (ModulesTest.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

abstractmodule, class, elementsource, injector, iterable, module, modulestest, override, stacktraceelement, suppresswarnings, testcase, util

The ModulesTest.java Java example source code

/**
 * 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;

import com.google.common.collect.ImmutableList;
import com.google.inject.spi.ElementSource;
import com.google.inject.util.Modules;

import junit.framework.TestCase;

import java.util.Arrays;

/**
 * @author jessewilson@google.com (Jesse Wilson)
 */
public class ModulesTest extends TestCase {

  public void testCombineVarargs() {
    Module combined = Modules.combine(newModule(1), newModule(2L), newModule((short) 3));
    Injector injector = Guice.createInjector(combined);
    assertEquals(1, injector.getInstance(Integer.class).intValue());
    assertEquals(2L, injector.getInstance(Long.class).longValue());
    assertEquals(3, injector.getInstance(Short.class).shortValue());
  }
  
  public void testCombineIterable() {
    Iterable<Module> modules = Arrays.asList(newModule(1), newModule(2L), newModule((short) 3));
    Injector injector = Guice.createInjector(Modules.combine(modules));
    assertEquals(1, injector.getInstance(Integer.class).intValue());
    assertEquals(2, injector.getInstance(Long.class).longValue());
    assertEquals(3, injector.getInstance(Short.class).shortValue());
  }

  /**
   * The module returned by Modules.combine shouldn't show up in binder sources.
   */
  public void testCombineSources() {
    final Module m1 = newModule(1);
    final Module m2 = newModule(2L);
    final Module combined1 = Modules.combine(m1, m2);
    Module skipSourcesModule = new AbstractModule() {
      @Override protected void configure() {
        install(combined1);
      }
    };
    final Module combined2 = Modules.combine(skipSourcesModule);
    Injector injector = Guice.createInjector(combined2);
    ElementSource source = (ElementSource) injector.getBinding(Integer.class).getSource();
    assertEquals(source.getModuleClassNames().size(), 4);
    assertEquals(ImmutableList.of(m1.getClass().getName(),
        combined1.getClass().getName(), skipSourcesModule.getClass().getName(),
        combined2.getClass().getName()), source.getModuleClassNames());
    StackTraceElement stackTraceElement = (StackTraceElement) source.getDeclaringSource();
    assertEquals(skipSourcesModule.getClass().getName(), stackTraceElement.getClassName());
  }

  private <T> Module newModule(final T toBind) {
    return new AbstractModule() {
      protected void configure() {
        @SuppressWarnings("unchecked") // getClass always needs a cast
        Class<T> tClass = (Class) toBind.getClass();
        binder().skipSources(getClass()).bind(tClass).toInstance(toBind);
      }
    };
  }
}

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