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Java example source code file (ModuleRewriterTest.java)

This example Java source code file (ModuleRewriterTest.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, configurationexception, defaultelementvisitor, element, injector, list, module, modulerewritertest, provider, string, testcase, util, wine

The ModuleRewriterTest.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.spi;

import com.google.common.collect.Lists;
import com.google.inject.AbstractModule;
import com.google.inject.Binding;
import com.google.inject.ConfigurationException;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.Provider;
import com.google.inject.name.Names;

import junit.framework.TestCase;

import java.util.List;

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

  public void testRewriteBindings() {
    // create a module the binds String.class and CharSequence.class
    Module module = new AbstractModule() {
      protected void configure() {
        bind(String.class).toInstance("Pizza");
        bind(CharSequence.class).toInstance("Wine");
      }
    };

    // record the elements from that module
    List<Element> elements = Elements.getElements(module);

    // create a rewriter that rewrites the binding to 'Wine' with a binding to 'Beer'
    List<Element> rewritten = Lists.newArrayList();
    for (Element element : elements) {
      element = element.acceptVisitor(new DefaultElementVisitor<Element>() {
        @Override public <T> Element visit(Binding binding) {
          T target = binding.acceptTargetVisitor(Elements.<T>getInstanceVisitor());
          if ("Wine".equals(target)) {
            return null;
          }
          else {
            return binding;
          }
        }
      });
      if (element != null) {
        rewritten.add(element);
      }
    }

    // create a module from the original list of elements and the rewriter
    Module rewrittenModule = Elements.getModule(rewritten);

    // the wine binding is dropped
    Injector injector = Guice.createInjector(rewrittenModule);
    try {
      injector.getInstance(CharSequence.class);
      fail();
    } catch (ConfigurationException expected) {
    }
  }

  public void testGetProviderAvailableAtInjectMembersTime() {
    Module module = new AbstractModule() {
      public void configure() {
        final Provider<String> stringProvider = getProvider(String.class);

        bind(String.class).annotatedWith(Names.named("2")).toProvider(new Provider<String>() {
          private String value;

          @Inject void initialize() {
            value = stringProvider.get();
          }

          public String get() {
            return value;
          }
        });

        bind(String.class).toInstance("A");
      }
    };

    // the module works fine normally
    Injector injector = Guice.createInjector(module);
    assertEquals("A", injector.getInstance(Key.get(String.class, Names.named("2"))));

    // and it should also work fine if we rewrite it
    List<Element> elements = Elements.getElements(module);
    Module replayed = Elements.getModule(elements);
    Injector replayedInjector = Guice.createInjector(replayed);
    assertEquals("A", replayedInjector.getInstance(Key.get(String.class, Names.named("2"))));
  }
}

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