home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (FactoryProviderTest.java)

This example Java source code file (FactoryProviderTest.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, assistedinject, camaro, car, color, coloredcarfactory, corvette, explosionexception, fireexception, injector, mustang, override, suppresswarnings, typeliteral, util

The FactoryProviderTest.java Java example source code

/**
 * Copyright (C) 2007 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.Asserts.assertContains;

import com.google.common.collect.ImmutableSet;
import com.google.inject.AbstractModule;
import com.google.inject.Binding;
import com.google.inject.ConfigurationException;
import com.google.inject.CreationException;
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 com.google.inject.TypeLiteral;
import com.google.inject.assistedinject.FactoryProviderTest.Equals.ComparisonMethod;
import com.google.inject.assistedinject.FactoryProviderTest.Equals.Impl;
import com.google.inject.name.Named;
import com.google.inject.name.Names;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.HasDependencies;

import junit.framework.TestCase;

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

/**
 * @author jmourits@google.com (Jerome Mourits)
 * @author jessewilson@google.com (Jesse Wilson)
 */
@SuppressWarnings("deprecation")
public class FactoryProviderTest extends TestCase {
  
  private enum Color { BLUE, GREEN, RED, GRAY, BLACK, ORANGE, PINK }

  public void testAssistedFactory() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Double.class).toInstance(5.0d);
        bind(ColoredCarFactory.class)
            .toProvider(FactoryProvider.newFactory(ColoredCarFactory.class, Mustang.class));
      }
    });
    ColoredCarFactory carFactory = injector.getInstance(ColoredCarFactory.class);

    Mustang blueMustang = (Mustang) carFactory.create(Color.BLUE);
    assertEquals(Color.BLUE, blueMustang.color);
    assertEquals(5.0d, blueMustang.engineSize);

    Mustang redMustang = (Mustang) carFactory.create(Color.RED);
    assertEquals(Color.RED, redMustang.color);
    assertEquals(5.0d, redMustang.engineSize);
  }

  public void testFactoryBindingDependencies() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Double.class).toInstance(5.0d);
        bind(ColoredCarFactory.class)
            .toProvider(FactoryProvider.newFactory(ColoredCarFactory.class, Mustang.class));
      }
    });

    Binding<?> binding = injector.getBinding(ColoredCarFactory.class);
    HasDependencies hasDependencies = (HasDependencies) binding;
    assertEquals(ImmutableSet.<Dependencyof(Dependency.get(Key.get(double.class))),
        hasDependencies.getDependencies());
  }

  public void testAssistedFactoryWithAnnotations() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(int.class).annotatedWith(Names.named("horsePower")).toInstance(250);
        bind(int.class).annotatedWith(Names.named("modelYear")).toInstance(1984);
        bind(ColoredCarFactory.class)
            .toProvider(FactoryProvider.newFactory(ColoredCarFactory.class, Camaro.class));
      }
    });

    ColoredCarFactory carFactory = injector.getInstance(ColoredCarFactory.class);

    Camaro blueCamaro = (Camaro) carFactory.create(Color.BLUE);
    assertEquals(Color.BLUE, blueCamaro.color);
    assertEquals(1984, blueCamaro.modelYear);
    assertEquals(250, blueCamaro.horsePower);

    Camaro redCamaro = (Camaro) carFactory.create(Color.RED);
    assertEquals(Color.RED, redCamaro.color);
    assertEquals(1984, redCamaro.modelYear);
    assertEquals(250, redCamaro.horsePower);
  }

  interface Car {
  }

  interface ColoredCarFactory {
    Car create(Color color);
  }

  public static class Mustang implements Car {
    private final double engineSize;
    private final Color color;

    @AssistedInject
    public Mustang(double engineSize, @Assisted Color color) {
      this.engineSize = engineSize;
      this.color = color;
    }
  }

  public static class Camaro implements Car {
    private final int horsePower;
    private final int modelYear;
    private final Color color;

    @AssistedInject
    public Camaro(
        @Named("horsePower")int horsePower,
        @Named("modelYear")int modelYear,
        @Assisted Color color) {
      this.horsePower = horsePower;
      this.modelYear = modelYear;
      this.color = color;
    }
  }

  interface SummerCarFactory {
    Car create(Color color, boolean convertable);
    Car createConvertible(Color color);
  }

  public void testFactoryWithMultipleMethods() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(float.class).toInstance(140f);
        bind(SummerCarFactory.class).toProvider(
            FactoryProvider.newFactory(SummerCarFactory.class, Corvette.class));
      }
    });

    SummerCarFactory carFactory = injector.getInstance(SummerCarFactory.class);

    Corvette blueCorvette = (Corvette) carFactory.createConvertible(Color.BLUE);
    assertEquals(Color.BLUE, blueCorvette.color);
    assertEquals(100f, blueCorvette.maxMph);
    assertTrue(blueCorvette.isConvertable);

    Corvette redCorvette = (Corvette) carFactory.create(Color.RED, false);
    assertEquals(Color.RED, redCorvette.color);
    assertEquals(140f, redCorvette.maxMph);
    assertFalse(redCorvette.isConvertable);
  }

  public static class Corvette implements Car {
    private boolean isConvertable;
    private Color color;
    private float maxMph;

    @AssistedInject
    public Corvette(@Assisted Color color) {
      this(color, 100f, true);
    }

    @SuppressWarnings("unused")
    public Corvette(@Assisted Color color, @Assisted boolean isConvertable) {
      throw new IllegalStateException("Not an @AssistedInject constructor");
    }

    @AssistedInject
    public Corvette(@Assisted Color color, Float maxMph, @Assisted boolean isConvertable) {
      this.isConvertable = isConvertable;
      this.color = color;
      this.maxMph = maxMph;
    }
  }

  public void testFactoryMethodsMismatch() {
    try {
      FactoryProvider.newFactory(SummerCarFactory.class, Beetle.class);
      fail();
    } catch(ConfigurationException e) {
      assertContains(e.getMessage(), "Constructor mismatch");
    }
  }

  public static class Beetle implements Car {
    @AssistedInject
    @SuppressWarnings("unused")
    public Beetle(@Assisted Color color) {
      throw new IllegalStateException("Conflicting constructors");
    }
    @AssistedInject
    @SuppressWarnings("unused")
    public Beetle(@Assisted Color color, @Assisted boolean isConvertable) {
      throw new IllegalStateException("Conflicting constructors");
    }
    @AssistedInject
    @SuppressWarnings("unused")
    public Beetle(@Assisted Color color, @Assisted boolean isConvertable, float maxMph) {
      throw new IllegalStateException("Conflicting constructors");
    }
  }

  public void testMethodsAndFieldsGetInjected() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(String.class).toInstance("turbo");
        bind(int.class).toInstance(911);
        bind(double.class).toInstance(50000d);
        bind(ColoredCarFactory.class)
            .toProvider(FactoryProvider.newFactory(ColoredCarFactory.class, Porshe.class));
      }
    });
    ColoredCarFactory carFactory = injector.getInstance(ColoredCarFactory.class);

    Porshe grayPorshe = (Porshe) carFactory.create(Color.GRAY);
    assertEquals(Color.GRAY, grayPorshe.color);
    assertEquals(50000d, grayPorshe.price);
    assertEquals(911, grayPorshe.model);
    assertEquals("turbo", grayPorshe.name);
  }

  public static class Porshe implements Car {
    private final Color color;
    private final double price;
    private @Inject String name;
    private int model;

    @AssistedInject
    public Porshe(@Assisted Color color, double price) {
      this.color = color;
      this.price = price;
    }

    @Inject void setModel(int model) {
      this.model = model;
    }
  }

  public void testProviderInjection() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(String.class).toInstance("trans am");
        bind(ColoredCarFactory.class)
            .toProvider(FactoryProvider.newFactory(ColoredCarFactory.class, Firebird.class));
      }
    });
    ColoredCarFactory carFactory = injector.getInstance(ColoredCarFactory.class);

    Firebird blackFirebird = (Firebird) carFactory.create(Color.BLACK);
    assertEquals(Color.BLACK, blackFirebird.color);
    assertEquals("trans am", blackFirebird.modifiersProvider.get());
  }

  public static class Firebird implements Car {
    private final Provider<String> modifiersProvider;
    private final Color color;

    @AssistedInject
    public Firebird(Provider<String> modifiersProvider, @Assisted Color color) {
      this.modifiersProvider = modifiersProvider;
      this.color = color;
    }
  }

  public void testTypeTokenInjection() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(new TypeLiteral<Set() {}).toInstance(Collections.singleton("Flux Capacitor"));
        bind(new TypeLiteral<Set() {}).toInstance(Collections.singleton(88));
        bind(ColoredCarFactory.class)
            .toProvider(FactoryProvider.newFactory(ColoredCarFactory.class, DeLorean.class));
      }
    });
    ColoredCarFactory carFactory = injector.getInstance(ColoredCarFactory.class);

    DeLorean deLorean = (DeLorean) carFactory.create(Color.GRAY);
    assertEquals(Color.GRAY, deLorean.color);
    assertEquals("Flux Capacitor", deLorean.features.iterator().next());
    assertEquals(new Integer(88), deLorean.featureActivationSpeeds.iterator().next());
  }

  public static class DeLorean implements Car {
    private final Set<String> features;
    private final Set<Integer> featureActivationSpeeds;
    private final Color color;

    @AssistedInject
    public DeLorean(
        Set<String> extraFeatures, Set featureActivationSpeeds, @Assisted Color color) {
      this.features = extraFeatures;
      this.featureActivationSpeeds = featureActivationSpeeds;
      this.color = color;
    }
  }

  public void testTypeTokenProviderInjection() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(new TypeLiteral<Set() { }).toInstance(Collections.singleton("Datsun"));
        bind(ColoredCarFactory.class)
            .toProvider(FactoryProvider.newFactory(ColoredCarFactory.class, Z.class));
      }
    });
    ColoredCarFactory carFactory = injector.getInstance(ColoredCarFactory.class);

    Z orangeZ = (Z) carFactory.create(Color.ORANGE);
    assertEquals(Color.ORANGE, orangeZ.color);
    assertEquals("Datsun", orangeZ.manufacturersProvider.get().iterator().next());
  }

  public static class Z implements Car {
    private final Provider<Set manufacturersProvider;
    private final Color color;

    @AssistedInject
    public Z(Provider<Set manufacturersProvider, @Assisted Color color) {
      this.manufacturersProvider = manufacturersProvider;
      this.color = color;
    }
  }
  
  public static class Prius implements Car {
    @SuppressWarnings("unused")
    private final Color color;
    
    @AssistedInject
    private Prius(@Assisted Color color) {
      this.color = color;
    }
  }
  
  public void testAssistInjectionInNonPublicConstructor() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(ColoredCarFactory.class)
            .toProvider(FactoryProvider.newFactory(ColoredCarFactory.class, Prius.class));
      }
    });
    injector.getInstance(ColoredCarFactory.class).create(Color.ORANGE);
  }

  public static class ExplodingCar implements Car {
    @AssistedInject
    public ExplodingCar(@SuppressWarnings("unused") @Assisted Color color) {
      throw new IllegalStateException("kaboom!");
    }
  }

  public void testExceptionDuringConstruction() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(ColoredCarFactory.class).toProvider(
            FactoryProvider.newFactory(ColoredCarFactory.class, ExplodingCar.class));
      }
    });
    try {
      injector.getInstance(ColoredCarFactory.class).create(Color.ORANGE);
      fail();
    } catch (IllegalStateException e) {
      assertEquals("kaboom!", e.getMessage());
    }
  }
  
  public static class DefectiveCar implements Car {
    @AssistedInject
    public DefectiveCar() throws ExplosionException {
      throw new ExplosionException();
    }
  }
  
  public static class ExplosionException extends Exception { }
  public static class FireException extends Exception { }
  
  public interface DefectiveCarFactoryWithNoExceptions {
    Car createCar();
  }

  public interface DefectiveCarFactory {
    Car createCar() throws FireException;
  }

  public void testFactoryMethodMustDeclareAllConstructorExceptions() {
    try {
      FactoryProvider.newFactory(DefectiveCarFactoryWithNoExceptions.class, DefectiveCar.class);
      fail();
    } catch (ConfigurationException expected) {
      assertContains(expected.getMessage(), "no compatible exception is thrown");
    }
  }

  public interface CorrectDefectiveCarFactory {
    Car createCar() throws FireException, ExplosionException;
  }
  
  public void testConstructorExceptionsAreThrownByFactory() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(CorrectDefectiveCarFactory.class).toProvider(
            FactoryProvider.newFactory(
                CorrectDefectiveCarFactory.class, DefectiveCar.class));
      }
    });
    try {
      injector.getInstance(CorrectDefectiveCarFactory.class).createCar();
      fail();
    } catch (FireException e) {
      fail();
    } catch (ExplosionException expected) {
    }
  }

  public static class MultipleConstructorDefectiveCar implements Car {
    @AssistedInject
    public MultipleConstructorDefectiveCar() throws ExplosionException {
      throw new ExplosionException();
    }

    @AssistedInject
    public MultipleConstructorDefectiveCar(@SuppressWarnings("unused") @Assisted Color c)
        throws FireException {
      throw new FireException();
    }
  }

  public interface MultipleConstructorDefectiveCarFactory {
    Car createCar() throws ExplosionException;
    Car createCar(Color r) throws FireException;
  }

  public void testMultipleConstructorExceptionMatching() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(MultipleConstructorDefectiveCarFactory.class).toProvider(
            FactoryProvider.newFactory(
                MultipleConstructorDefectiveCarFactory.class,
                MultipleConstructorDefectiveCar.class));
      }
    });
    MultipleConstructorDefectiveCarFactory factory
        = injector.getInstance(MultipleConstructorDefectiveCarFactory.class);
    try {
      factory.createCar();
      fail();
    } catch (ExplosionException expected) {
    }

    try {
      factory.createCar(Color.RED);
      fail();
    } catch (FireException expected) {
    }
  }
  
  public static class WildcardCollection {
    
    public interface Factory {
      WildcardCollection create(Collection<?> items);
    }

    @AssistedInject
    public WildcardCollection(@SuppressWarnings("unused") @Assisted Collection<?> items) { }
  }
  
  public void testWildcardGenerics() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(WildcardCollection.Factory.class).toProvider(
            FactoryProvider.newFactory(
                WildcardCollection.Factory.class,
                WildcardCollection.class));
      }
    });
    WildcardCollection.Factory factory = injector.getInstance(WildcardCollection.Factory.class);
    factory.create(Collections.emptyList());
  }
  
  public static class SteeringWheel {}
  
  public static class Fiat implements Car {
    @SuppressWarnings("unused")
    private final SteeringWheel steeringWheel;
    @SuppressWarnings("unused")
    private final Color color;
    
    @AssistedInject
    public Fiat(SteeringWheel steeringWheel, @Assisted Color color) {
      this.steeringWheel = steeringWheel;
      this.color = color;
    }
  }
  
  public void testFactoryWithImplicitBindings() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(ColoredCarFactory.class).toProvider(
            FactoryProvider.newFactory(
                ColoredCarFactory.class, 
                Fiat.class));
      }
    });

    ColoredCarFactory coloredCarFactory = injector.getInstance(ColoredCarFactory.class);
    Fiat fiat = (Fiat) coloredCarFactory.create(Color.GREEN);
    assertEquals(Color.GREEN, fiat.color);
    assertNotNull(fiat.steeringWheel);
  }
  
  public void testFactoryFailsWithMissingBinding() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override protected void configure() {
          bind(ColoredCarFactory.class)
              .toProvider(FactoryProvider.newFactory(ColoredCarFactory.class, Mustang.class));
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(),
          "1) Parameter of type 'double' is not injectable or annotated with @Assisted");
    }
  }
  
  public void testMethodsDeclaredInObject() {
    Injector injector = Guice.createInjector(new AbstractModule() {
        @Override protected void configure() {
          bind(Double.class).toInstance(5.0d);
          bind(ColoredCarFactory.class)
              .toProvider(FactoryProvider.newFactory(ColoredCarFactory.class, Mustang.class));
        }
      });
    
    ColoredCarFactory carFactory = injector.getInstance(ColoredCarFactory.class);
    
    carFactory.equals(carFactory);
    carFactory.hashCode();
    carFactory.toString();
  }

  public void testAssistedInjectConstructorAndAssistedFactoryParameterMustNotMix() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override protected void configure() {
          bind(Double.class).toInstance(5.0d);
          bind(AssistedParamsFactory.class)
              .toProvider(FactoryProvider.newFactory(AssistedParamsFactory.class, Mustang.class));
        }
      });
      fail();
    } catch (CreationException expected) {
      assertContains(expected.getMessage(), "Factory method "
          + AssistedParamsFactory.class.getName() + ".create() has an @Assisted parameter, which "
          + "is incompatible with the deprecated @AssistedInject annotation.");
    }
  }

  interface AssistedParamsFactory {
    Car create(@Assisted Color color);
  }

  interface GenericColoredCarFactory<T extends Car> {
    T create(Color color);
  }

  public void testGenericAssistedFactory() {
    final TypeLiteral<GenericColoredCarFactory mustangTypeLiteral
        = new TypeLiteral<GenericColoredCarFactory() {};
    final TypeLiteral<GenericColoredCarFactory camaroTypeLiteral
        = new TypeLiteral<GenericColoredCarFactory() {};

    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Double.class).toInstance(5.0d);
        bind(int.class).annotatedWith(Names.named("horsePower")).toInstance(250);
        bind(int.class).annotatedWith(Names.named("modelYear")).toInstance(1984);
        bind(mustangTypeLiteral).toProvider(
            FactoryProvider.newFactory(mustangTypeLiteral, TypeLiteral.get(Mustang.class)));
        bind(camaroTypeLiteral).toProvider(
            FactoryProvider.newFactory(camaroTypeLiteral, TypeLiteral.get(Camaro.class)));
      }
    });

    GenericColoredCarFactory<Mustang> mustangFactory
        = injector.getInstance(Key.get(mustangTypeLiteral));
    GenericColoredCarFactory<Camaro> camaroFactory
        = injector.getInstance(Key.get(camaroTypeLiteral));

    Mustang blueMustang = mustangFactory.create(Color.BLUE);
    assertEquals(Color.BLUE, blueMustang.color);
    assertEquals(5.0d, blueMustang.engineSize);

    Camaro redCamaro = camaroFactory.create(Color.RED);
    assertEquals(Color.RED, redCamaro.color);
    assertEquals(1984, redCamaro.modelYear);
    assertEquals(250, redCamaro.horsePower);
  }

  @SuppressWarnings("unused")
  public interface Insurance<T extends Car> {
  }

  public static class MustangInsurance implements Insurance<Mustang> {
    private final double premium;
    private final double limit;
    @SuppressWarnings("unused") private Mustang car;

    @AssistedInject
    public MustangInsurance(@Named("lowLimit") double limit, @Assisted Mustang car,
        @Assisted double premium) {
      this.premium = premium;
      this.limit = limit;
      this.car = car;
    }

    public void sell() {}
  }

  public static class CamaroInsurance implements Insurance<Camaro> {
    private final double premium;
    private final double limit;
    @SuppressWarnings("unused") private Camaro car;

    @AssistedInject
    public CamaroInsurance(@Named("highLimit") double limit, @Assisted Camaro car,
        @Assisted double premium) {
      this.premium = premium;
      this.limit = limit;
      this.car = car;
    }

    public void sell() {}
  }

  public interface MustangInsuranceFactory {
    public Insurance<Mustang> create(Mustang car, double premium);
  }

  public interface CamaroInsuranceFactory {
    public Insurance<Camaro> create(Camaro car, double premium);
  }

  public void testAssistedFactoryForConcreteType() {

    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Double.class).annotatedWith(Names.named("lowLimit")).toInstance(50000.0d);
        bind(Double.class).annotatedWith(Names.named("highLimit")).toInstance(100000.0d);
        bind(MustangInsuranceFactory.class).toProvider(
            FactoryProvider.newFactory(MustangInsuranceFactory.class, MustangInsurance.class));
        bind(CamaroInsuranceFactory.class).toProvider(
            FactoryProvider.newFactory(CamaroInsuranceFactory.class, CamaroInsurance.class));
      }
    });

    MustangInsuranceFactory mustangInsuranceFactory =
        injector.getInstance(MustangInsuranceFactory.class);
    CamaroInsuranceFactory camaroInsuranceFactory =
        injector.getInstance(CamaroInsuranceFactory.class);

    Mustang mustang = new Mustang(5000d, Color.BLACK);
    MustangInsurance mustangPolicy =
        (MustangInsurance) mustangInsuranceFactory.create(mustang, 800.0d);
    assertEquals(800.0d, mustangPolicy.premium);
    assertEquals(50000.0d, mustangPolicy.limit);

    Camaro camaro = new Camaro(3000, 1967, Color.BLUE);
    CamaroInsurance camaroPolicy = (CamaroInsurance) camaroInsuranceFactory.create(camaro, 800.0d);
    assertEquals(800.0d, camaroPolicy.premium);
    assertEquals(100000.0d, camaroPolicy.limit);
  }

  public interface InsuranceFactory<T extends Car> {
    public Insurance<T> create(T car, double premium);
  }

  public void testAssistedFactoryForParameterizedType() {
    final TypeLiteral<InsuranceFactory mustangInsuranceFactoryType =
        new TypeLiteral<InsuranceFactory() {};
    final TypeLiteral<InsuranceFactory camaroInsuranceFactoryType =
        new TypeLiteral<InsuranceFactory() {};

    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Double.class).annotatedWith(Names.named("lowLimit")).toInstance(50000.0d);
        bind(Double.class).annotatedWith(Names.named("highLimit")).toInstance(100000.0d);
        bind(mustangInsuranceFactoryType).toProvider(FactoryProvider.newFactory(
            mustangInsuranceFactoryType, TypeLiteral.get(MustangInsurance.class)));
        bind(camaroInsuranceFactoryType).toProvider(FactoryProvider.newFactory(
            camaroInsuranceFactoryType, TypeLiteral.get(CamaroInsurance.class)));
      }
    });

    InsuranceFactory<Mustang> mustangInsuranceFactory =
        injector.getInstance(Key.get(mustangInsuranceFactoryType));
    InsuranceFactory<Camaro> camaroInsuranceFactory =
        injector.getInstance(Key.get(camaroInsuranceFactoryType));

    Mustang mustang = new Mustang(5000d, Color.BLACK);
    MustangInsurance mustangPolicy =
        (MustangInsurance) mustangInsuranceFactory.create(mustang, 800.0d);
    assertEquals(800.0d, mustangPolicy.premium);
    assertEquals(50000.0d, mustangPolicy.limit);

    Camaro camaro = new Camaro(3000, 1967, Color.BLUE);
    CamaroInsurance camaroPolicy = (CamaroInsurance) camaroInsuranceFactory.create(camaro, 800.0d);
    assertEquals(800.0d, camaroPolicy.premium);
    assertEquals(100000.0d, camaroPolicy.limit);
  }

  public static class AutoInsurance<T extends Car> implements Insurance {
    private final double premium;
    private final double limit;
    private final T car;

    @AssistedInject
    public AutoInsurance(double limit, @Assisted T car, @Assisted double premium) {
      this.limit = limit;
      this.car = car;
      this.premium = premium;
    }

    public void sell() {}
  }

  public void testAssistedFactoryForTypeVariableParameters() {
    final TypeLiteral<InsuranceFactory camaroInsuranceFactoryType =
        new TypeLiteral<InsuranceFactory() {};

    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Double.class).toInstance(50000.0d);
        bind(camaroInsuranceFactoryType).toProvider(FactoryProvider.newFactory(
            camaroInsuranceFactoryType, new TypeLiteral<AutoInsurance() {}));
      }
    });

    InsuranceFactory<Camaro> camaroInsuranceFactory =
        injector.getInstance(Key.get(camaroInsuranceFactoryType));

    Camaro camaro = new Camaro(3000, 1967, Color.BLUE);
    AutoInsurance<?> camaroPolicy =
        (AutoInsurance<?>) camaroInsuranceFactory.create(camaro, 800.0d);
    assertEquals(800.0d, camaroPolicy.premium);
    assertEquals(50000.0d, camaroPolicy.limit);
    assertEquals(camaro, camaroPolicy.car);
  }

  public void testDuplicateAssistedFactoryBinding() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Double.class).toInstance(5.0d);
        bind(ColoredCarFactory.class)
            .toProvider(FactoryProvider.newFactory(ColoredCarFactory.class, Mustang.class));
        bind(ColoredCarFactory.class)
            .toProvider(FactoryProvider.newFactory(ColoredCarFactory.class, Mustang.class));
      }
    });
    ColoredCarFactory carFactory = injector.getInstance(ColoredCarFactory.class);

    Mustang blueMustang = (Mustang) carFactory.create(Color.BLUE);
    assertEquals(Color.BLUE, blueMustang.color);
    assertEquals(5.0d, blueMustang.engineSize);

    Mustang redMustang = (Mustang) carFactory.create(Color.RED);
    assertEquals(Color.RED, redMustang.color);
    assertEquals(5.0d, redMustang.engineSize);
  }

  public interface Equals {

    enum ComparisonMethod { SHALLOW, DEEP; }

    interface Factory {
      Equals equals(Equals.ComparisonMethod comparisonMethod);
    }

    public static class Impl implements Equals {
      private final double sigma;
      private final ComparisonMethod comparisonMethod;

      @Inject
      public Impl(double sigma, @Assisted ComparisonMethod comparisonMethod) {
        this.sigma = sigma;
        this.comparisonMethod = comparisonMethod;
      }
    }
  }

  public void testFactoryMethodCalledEquals() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Double.class).toInstance(0.01d);
        bind(Equals.Factory.class).toProvider(
            FactoryProvider.newFactory(Equals.Factory.class, Equals.Impl.class));
      }
    });
    Equals.Factory equalsFactory = injector.getInstance(Equals.Factory.class);
    Equals.Impl shallowEquals = (Impl) equalsFactory.equals(ComparisonMethod.SHALLOW);
    assertEquals(ComparisonMethod.SHALLOW, shallowEquals.comparisonMethod);
    assertEquals(0.01d, shallowEquals.sigma);
  }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java FactoryProviderTest.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.