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Java example source code file (HasDependenciesTest.java)

This example Java source code file (HasDependenciesTest.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, awithdependencies, dependency, hasdependenciestest, injector, instancebinding, providerinstancebinding, providerofa, providerofawithdependencies, providerwithdependencies, set, testcase, unsupportedoperationexception, util

The HasDependenciesTest.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.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.inject.AbstractModule;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Provider;

import junit.framework.TestCase;

import java.util.Set;

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

  /**
   * When an instance implements HasDependencies, the injected dependencies aren't used.
   */
  public void testInstanceWithDependencies() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      protected void configure() {
        bind(A.class).toInstance(new AWithDependencies());
      }
    });

    InstanceBinding<?> binding = (InstanceBinding) injector.getBinding(A.class);
    assertEquals(ImmutableSet.<Dependencyof(Dependency.get(Key.get(Integer.class))),
        binding.getDependencies());
  }

  public void testInstanceWithoutDependencies() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      protected void configure() {
        bind(A.class).toInstance(new A());
      }
    });

    InstanceBinding<?> binding = (InstanceBinding) injector.getBinding(A.class);
    Dependency<?> onlyDependency = Iterables.getOnlyElement(binding.getDependencies());
    assertEquals(Key.get(String.class), onlyDependency.getKey());
  }

  public void testProvider() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      protected void configure() {
        bind(A.class).toProvider(new ProviderOfA());
      }
    });

    ProviderInstanceBinding<?> binding = (ProviderInstanceBinding) injector.getBinding(A.class);
    Dependency<?> onlyDependency = Iterables.getOnlyElement(binding.getDependencies());
    assertEquals(Key.get(String.class), onlyDependency.getKey());
  }

  static class A {
    @Inject void injectUnusedDependencies(String unused) {}
  }

  static class ProviderOfA implements Provider<A> {
    @Inject void injectUnusedDependencies(String unused) {}

    public A get() {
      throw new UnsupportedOperationException();
    }
  }

  static class AWithDependencies extends A implements HasDependencies {
    public Set<Dependency getDependencies() {
      return ImmutableSet.<Dependencyof(Dependency.get(Key.get(Integer.class)));
    }
  }

  static class ProviderOfAWithDependencies
      extends ProviderOfA implements ProviderWithDependencies<A> {
    public Set<Dependency getDependencies() {
      return ImmutableSet.<Dependencyof(Dependency.get(Key.get(Integer.class)));
    }
  }
}

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