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Java example source code file (ExtensionSpiTest.java)

This example Java source code file (ExtensionSpiTest.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

animal, assistedinjectspivisitor, catwithaname, exception, explodingcat, integer, list, log, logging, module, named, override, set, simplecat, strangecat, string, util

The ExtensionSpiTest.java Java example source code

/**
 * Copyright (C) 2010 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.assistedinject;

import static com.google.inject.name.Names.named;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.google.inject.AbstractModule;
import com.google.inject.Binding;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Stage;
import com.google.inject.name.Named;
import com.google.inject.spi.DefaultBindingTargetVisitor;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.Element;
import com.google.inject.spi.Elements;

import junit.framework.AssertionFailedError;
import junit.framework.TestCase;

import java.util.List;
import java.util.Set;
import java.util.logging.Logger;

/**
 * Tests for AssistedInject Spi.
 *
 * @author ramakrishna@google.com (Ramakrishna Rajanna)
 */
public class ExtensionSpiTest extends TestCase {

  public final void testSpiOnElements() throws Exception {
    AssistedInjectSpiVisitor visitor = new AssistedInjectSpiVisitor();
    Integer count = 0;
    for(Element element : Elements.getElements(new Module())) {
      if(element instanceof Binding) {
        assertEquals(count++, ((Binding<?>)element).acceptTargetVisitor(visitor));
      }
    }
    validateVisitor(visitor);
  }

  public void testSpiOnVisitor() throws Exception {
    AssistedInjectSpiVisitor visitor = new AssistedInjectSpiVisitor();
    Integer count = 0;
    Injector injector = Guice.createInjector(new Module());
    for(Binding<?> binding : injector.getBindings().values()) {
      assertEquals(count++, binding.acceptTargetVisitor(visitor));
    }
    validateVisitor(visitor);
  }

  private void validateVisitor(AssistedInjectSpiVisitor visitor) throws Exception {
    assertEquals(1, visitor.assistedBindingCount);
    List<AssistedMethod> assistedMethods =
        Lists.newArrayList(Iterables.getOnlyElement(
            visitor.assistedInjectBindings).getAssistedMethods());
    assertEquals(7, assistedMethods.size());
    assertEquals(1, visitor.assistedBindingCount);
    assertEquals(1, visitor.assistedInjectBindings.size());

    // Validate for each of the methods in AnimalFactory
    
    Set<String> names = Sets.newHashSet();
    for (AssistedMethod method : assistedMethods) {
      String name = method.getFactoryMethod().getName();
      names.add(name);
      if (name.equals("createAStrangeCatAsAnimal")) {        
        validateAssistedMethod(method, name, StrangeCat.class, ImmutableList.<Keyof());        
      } else if (name.equals("createStrangeCatWithConstructorForOwner")) {
        validateAssistedMethod(method, name, StrangeCat.class, ImmutableList.<Keyof());     
      } else if (name.equals("createStrangeCatWithConstructorForAge")) {
        validateAssistedMethod(method, name, StrangeCat.class, ImmutableList.<Keyof());        
      } else if (name.equals("createCatWithANonAssistedDependency")) {
        validateAssistedMethod(method, name, CatWithAName.class,
            ImmutableList.<Keyof(Key.get(String.class, named("catName2"))));        
      } else if (name.equals("createCat")) {
        validateAssistedMethod(method, name, Cat.class, ImmutableList.<Keyof());        
      } else if (name.equals("createASimpleCatAsAnimal")) {
        validateAssistedMethod(method, name, SimpleCat.class, ImmutableList.<Keyof());
      } else if (name.equals("createCatWithNonAssistedDependencies")) {
        List<Key dependencyKeys = ImmutableList.>of(
            Key.get(String.class, named("catName1")),
            Key.get(String.class, named("petName")),        
            Key.get(Integer.class, named("age")));
        validateAssistedMethod(method, name, ExplodingCat.class, dependencyKeys);        
      } else {
        fail("Invalid method: " + method);
      }
    }
    assertEquals(names, ImmutableSet.of("createAStrangeCatAsAnimal",
        "createStrangeCatWithConstructorForOwner",
        "createStrangeCatWithConstructorForAge",
        "createCatWithANonAssistedDependency",
        "createCat",
        "createASimpleCatAsAnimal",
        "createCatWithNonAssistedDependencies"));
  }

  private void validateAssistedMethod(AssistedMethod assistedMethod, String factoryMethodName,
                                      Class clazz, List<Key dependencyKeys){
    assertEquals(factoryMethodName, assistedMethod.getFactoryMethod().getName());
    assertEquals(clazz, assistedMethod.getImplementationConstructor().getDeclaringClass());
    assertEquals(dependencyKeys.size(), assistedMethod.getDependencies().size());
    for (Dependency<?> dependency : assistedMethod.getDependencies()) {
      assertTrue(dependencyKeys.contains(dependency.getKey()));
    }
    assertEquals(clazz, assistedMethod.getImplementationType().getType());
  }


  interface AnimalFactory {
    Cat createCat(String owner);
    CatWithAName createCatWithANonAssistedDependency(String owner);
    @Named("SimpleCat") Animal createASimpleCatAsAnimal(String owner);
    Animal createAStrangeCatAsAnimal(String owner);
    StrangeCat createStrangeCatWithConstructorForOwner(String owner);
    StrangeCat createStrangeCatWithConstructorForAge(Integer age);
    ExplodingCat createCatWithNonAssistedDependencies(String owner);
  }

  interface Animal {}

  private static class Cat implements Animal {
    @Inject Cat(@Assisted String owner) {}
  }

  private static class SimpleCat implements Animal {
    @Inject SimpleCat(@Assisted String owner) {
    }
  }

  private static class StrangeCat implements Animal {
    @AssistedInject StrangeCat(@Assisted String owner) {}
    @AssistedInject StrangeCat(@Assisted Integer age) {}
  }

  private static class ExplodingCat implements Animal {
    @Inject public ExplodingCat(@Named("catName1") String name, @Assisted String owner,
                                @Named("age") Integer age, @Named("petName") String petName) {}
  }

  private static class CatWithAName extends Cat {
    @Inject CatWithAName(@Assisted String owner, @Named("catName2") String name) {
      super(owner);
    }
  }

  public class Module extends AbstractModule{
    @Override
    protected void configure() {
      bind(String.class).annotatedWith(named("catName1")).toInstance("kitty1");
      bind(String.class).annotatedWith(named("catName2")).toInstance("kitty2");
      bind(String.class).annotatedWith(named("petName")).toInstance("pussy");
      bind(Integer.class).annotatedWith(named("age")).toInstance(12);
      install(new FactoryModuleBuilder()
        .implement(Animal.class, StrangeCat.class)
        .implement(Animal.class, named("SimpleCat"), SimpleCat.class)
        .build(AnimalFactory.class));
    }
  }

  public class AssistedInjectSpiVisitor extends DefaultBindingTargetVisitor<Object, Integer>
      implements AssistedInjectTargetVisitor<Object, Integer>  {

    private final Set<Class> allowedClasses = 
      ImmutableSet.<Class> of(
        Injector.class, Stage.class, Logger.class,
        String.class, Integer.class);
    
    private int assistedBindingCount = 0;
    private int currentCount = 0;
    private List<AssistedInjectBinding assistedInjectBindings = Lists.newArrayList();

    public Integer visit(AssistedInjectBinding assistedInjectBinding) {
      assistedInjectBindings.add(assistedInjectBinding);
      assistedBindingCount++;
      return currentCount++;
    }

    @Override
    protected Integer visitOther(Binding<? extends Object> binding) {
      if(!allowedClasses.contains(binding.getKey().getTypeLiteral().getRawType())) {
        throw new AssertionFailedError("invalid other binding: " + binding);
      }
      return currentCount++;
    }
  }
}

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