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Java example source code file (TransitiveDependencyVisitorTest.java)

This example Java source code file (TransitiveDependencyVisitorTest.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, binding, collection, constructedclass, constructedclassprovider, hasdependenciesclass, hasdependenciesmodule, inject, instancebinding, interface, override, providerinstancemodule, providerkeymodule, transitivedependencyvisitor, util

The TransitiveDependencyVisitorTest.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.grapher;

import com.google.common.collect.ImmutableSet;
import com.google.inject.AbstractModule;
import com.google.inject.Binding;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.Provider;
import com.google.inject.TypeLiteral;
import com.google.inject.name.Names;
import com.google.inject.spi.ConstructorBinding;
import com.google.inject.spi.ConvertedConstantBinding;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.HasDependencies;
import com.google.inject.spi.InstanceBinding;
import com.google.inject.spi.LinkedKeyBinding;
import com.google.inject.spi.ProviderBinding;
import com.google.inject.spi.ProviderInstanceBinding;
import com.google.inject.spi.ProviderKeyBinding;

import junit.framework.TestCase;

import java.util.Collection;
import java.util.Set;

/**
 * Tests for {@link TransitiveDependencyVisitor}.
 *
 * @author phopkins@gmail.com (Pete Hopkins)
 */
public class TransitiveDependencyVisitorTest extends TestCase {
  private TransitiveDependencyVisitor visitor;
  
  @Override
  protected void setUp() throws Exception {
    super.setUp();
    
    visitor = new TransitiveDependencyVisitor();
  }

  public void testVisitConstructor() {
    Binding<?> binding = getBinding(Key.get(ConstructedClass.class));
    Collection<Key dependencies = visitor.visit((ConstructorBinding) binding);
    
    assertDependencies(dependencies, Key.get(A.class), Key.get(B.class), Key.get(C.class),
        Key.get(D.class));
  }

  public void testVisitConvertedConstant() {
    Binding<?> binding = getBinding(Key.get(Integer.class, Names.named("number")),
        new ConvertedConstantModule());
    Collection<Key dependencies = visitor.visit(
        (ConvertedConstantBinding<?>) binding);
    
    assertDependencies(dependencies, Key.get(String.class, Names.named("number")));
  }

  public void testVisitInstance() {
    Binding<?> binding = getBinding(Key.get(ConstructedClass.class), new InstanceModule());
    Collection<Key dependencies = visitor.visit(
        (InstanceBinding<?>) binding);
    
    // Dependencies will only be on the field- and method-injected classes.
    assertDependencies(dependencies, Key.get(A.class), Key.get(D.class));
  }

  public void testVisitInstance_instanceHasDependencies() {
    Binding<?> binding = getBinding(Key.get(Interface.class), new HasDependenciesModule());
    Collection<Key dependencies = visitor.visit(
        (InstanceBinding<?>) binding);
    
    // Dependencies should only be on the stated
    // HasDependencies#getDependencies() values
    assertDependencies(dependencies, Key.get(G.class));
  }

  public void testVisitLinkedKey() {
    Binding<?> binding = getBinding(Key.get(Interface.class), new LinkedKeyModule());
    Collection<Key dependencies = visitor.visit((LinkedKeyBinding) binding);

    // Dependency should be to the class this interface is bound to.
    assertDependencies(dependencies, Key.get(ConstructedClass.class));
  }

  public void testVisitProviderBinding() {
    Binding<?> binding = getBinding(Key.get(new TypeLiteral>() {}));
    Collection<Key dependencies = visitor.visit((ProviderBinding) binding);
    
    assertDependencies(dependencies, Key.get(ConstructedClass.class));
  }

  public void testVisitProviderInstance() {
    Binding<?> binding = getBinding(Key.get(ConstructedClass.class),
        new ProviderInstanceModule());
    Collection<Key dependencies = visitor.visit(
        (ProviderInstanceBinding<?>) binding);
    
    // Dependencies will only be on the field- and method-injected classes.
    assertDependencies(dependencies, Key.get(E.class), Key.get(F.class));
  }

  public void testVisitProviderKey() {
    Binding<?> binding = getBinding(Key.get(ConstructedClass.class), new ProviderKeyModule());
    Collection<Key dependencies = visitor.visit((ProviderKeyBinding) binding);

    // Dependency should be to the class that provides this one.
    assertDependencies(dependencies, Key.get(ConstructedClassProvider.class));
  }
  
  private Binding<?> getBinding(Key key, Module... modules) {
    return Guice.createInjector(modules).getBinding(key);
  }
  
  private void assertDependencies(Collection<Key dependencies, Key... keys) {
    assertNotNull("Dependencies should not be null", dependencies);
    assertEquals("There should be " + keys.length + " dependencies",
        keys.length, dependencies.size());

    for (Key<?> key : keys) {
      assertTrue("Dependencies should contain " + key, dependencies.contains(key));
    }
  }

  private static class A {}
  private static class B {}
  private static class C {}
  private static class D {}
  private static class E {}
  private static class F {}
  private static class G {}
  
  private static interface Interface {}
  
  private static class ConstructedClass implements Interface {
    @Inject A a;
    ConstructedClass() {}
    @Inject ConstructedClass(B b, C c) {}
    @Inject void setD(D d) {}
  }

  private static class ConstructedClassProvider implements Provider<ConstructedClass> {
    @Inject E e;
    ConstructedClassProvider() {}
    @Inject ConstructedClassProvider(A a, B b, C c) {}
    @Inject void setF(F f) {}
    
    public ConstructedClass get() {
      return null;
    }
  }

  private static class HasDependenciesClass implements Interface, HasDependencies {
    @Inject A a;
    @Inject B b;
    
    public Set<Dependency getDependencies() {
      return ImmutableSet.<Dependencyof(Dependency.get(Key.get(G.class)));
    }
  }

  private static class ConvertedConstantModule extends AbstractModule {
    @Override
    protected void configure() {
      bindConstant().annotatedWith(Names.named("number")).to("2008");
    }
  }

  private static class InstanceModule extends AbstractModule {
    @Override
    protected void configure() {
      bind(ConstructedClass.class).toInstance(new ConstructedClass());
    }
  }

  private static class LinkedKeyModule extends AbstractModule {
    @Override
    protected void configure() {
      bind(Interface.class).to(ConstructedClass.class);
    }
  }
  
  private static class ProviderInstanceModule extends AbstractModule {
    @Override
    protected void configure() {
      bind(ConstructedClass.class).toProvider(new ConstructedClassProvider());
    }
  }

  private static class HasDependenciesModule extends AbstractModule {
    @Override
    protected void configure() {
      bind(Interface.class).toInstance(new HasDependenciesClass());
    }
  }
  
  private static class ProviderKeyModule extends AbstractModule {
    @Override
    protected void configure() {
      bind(ConstructedClass.class).toProvider(ConstructedClassProvider.class);
    }
  }
}

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