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Java example source code file (ManyConstructorsTest.java)

This example Java source code file (ManyConstructorsTest.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, bar, cow, creationexception, farm, foo, injector, integer, mom, override, pop, string, toomanymatches

The ManyConstructorsTest.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 com.google.inject.AbstractModule;
import com.google.inject.Asserts;
import com.google.inject.CreationException;
import com.google.inject.Guice;
import com.google.inject.Injector;

import junit.framework.TestCase;

/**
 * @author sameb@google.com (Sam Berlin)
 */
public class ManyConstructorsTest extends TestCase {
  
  public void testTwoConstructors() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        install(new FactoryModuleBuilder().build(Factory.class));
      }
    });
    Factory factory = injector.getInstance(Factory.class);
    Foo noIndex = factory.create("no index");
    assertEquals("no index", noIndex.name);
    assertNull(noIndex.index);
    Foo index = factory.create("index", 1);
    assertEquals("index", index.name);
    assertEquals(1, index.index.intValue());
  }
  
  public void testDifferentOrderParameters() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        install(new FactoryModuleBuilder().build(OtherFactory.class));
      }
    });
    OtherFactory factory = injector.getInstance(OtherFactory.class);
    Foo noIndex = factory.create("no index");
    assertEquals("no index", noIndex.name);
    assertNull(noIndex.index);
    Foo index = factory.create(1, "index");
    assertEquals("index", index.name);
    assertEquals(1, index.index.intValue());
    Foo index2 = factory.create("index", 2);
    assertEquals("index", index2.name);
    assertEquals(2, index2.index.intValue());
  }
  
  public void testInterfaceToImpl() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        install(new FactoryModuleBuilder()
          .implement(Bar.class, Foo.class)
          .build(BarFactory.class));
      }
    });
    BarFactory factory = injector.getInstance(BarFactory.class);
    Bar noIndex = factory.create("no index");
    assertEquals("no index", noIndex.getName());
    assertNull(noIndex.getIndex());
    Bar index = factory.create("index", 1);
    assertEquals("index", index.getName());
    assertEquals(1, index.getIndex().intValue());
  }
  
  public void testUsingOneConstructor() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        install(new FactoryModuleBuilder().build(SimpleFactory.class));
      }
    });
    SimpleFactory factory = injector.getInstance(SimpleFactory.class);
    Foo noIndex = factory.create("no index");
    assertEquals("no index", noIndex.name);
    assertNull(noIndex.index);
    
    injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        install(new FactoryModuleBuilder().build(SimpleFactory2.class));
      }
    });
    SimpleFactory2 factory2 = injector.getInstance(SimpleFactory2.class);
    Foo index = factory2.create("index", 1);
    assertEquals("index", index.name);
    assertEquals(1, index.index.intValue());
  }
  
  public void testTooManyMatchingConstructors() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          install(new FactoryModuleBuilder()
            .implement(Foo.class, TooManyMatches.class)
            .build(SimpleFactory2.class));
        }
      });
      fail("should have failed");
    } catch (CreationException expected) {
      Asserts.assertContains(expected.getMessage(), "1) " + TooManyMatches.class.getName()
          + " has more than one constructor annotated with @AssistedInject that "
          + "matches the parameters in method " + SimpleFactory2.class.getName());
    }
  }

  public void testNoMatchingConstructorsBecauseTooManyParams() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          install(new FactoryModuleBuilder().build(ComplexFactory.class));
        }
      });
      fail("should have failed");
    } catch (CreationException expected) {
      Asserts.assertContains(expected.getMessage(), "1) " + Foo.class.getName()
          + " has @AssistedInject constructors, but none of them match the parameters in method "
          + ComplexFactory.class.getName());
    }
  }
  
  public void testNoMatchingConstrucotsBecauseTooLittleParams() {
    try {
      Guice.createInjector(new AbstractModule() {
        @Override
        protected void configure() {
          install(new FactoryModuleBuilder().build(NullFactory.class));
        }
      });
      fail("should have failed");
    } catch (CreationException expected) {
      Asserts.assertContains(expected.getMessage(), "1) " + Foo.class.getName()
          + " has @AssistedInject constructors, but none of them match the parameters in method "
          + NullFactory.class.getName());
    }
  }

  public static interface ComplexFactory {
    Foo create(String name, int idx, float weight);
  }
  
  public static interface NullFactory {
    Foo create();
  }
  
  public static interface OtherFactory {
    Foo create(String name, int idx);
    Foo create(int idx, String name);
    Foo create(String name);
  }

  
  public static interface Factory {
    Foo create(String name);
    Foo create(String name, int idx);
  }
  
  public static interface BarFactory {
    Bar create(String name);
    Bar create(String name, int idx);
  }
  
  public static interface SimpleFactory {
    Foo create(String name);
  }
  
  public static interface SimpleFactory2 {
    Foo create(String name, int idx);
  }
  
  public static class TooManyMatches extends Foo {
    @AssistedInject TooManyMatches(@Assisted String name, @Assisted int index) {
    }
    
    @AssistedInject TooManyMatches(@Assisted int index, @Assisted String name) {
    }    
  }
  
  public static class Foo implements Bar {
    private String name;
    private Integer index;
    
    Foo() {}
    
    @AssistedInject Foo(@Assisted String name) {
      this.name = name;
      this.index = null;
    }
    
    @AssistedInject Foo(@Assisted String name, @Assisted int index) {
      this.name = name;
      this.index = index;
    }
    
    Foo(String a, String b, String c) {
      
    }
    
    public String getName() { return name; }
    public Integer getIndex() { return index; }
  }
  
  public static interface Bar {
    String getName();
    Integer getIndex();
  }
  
  public void testDependenciesAndOtherAnnotations() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        install(new FactoryModuleBuilder().build(FamilyFarmFactory.class));
      }
    });
    
    FamilyFarmFactory factory = injector.getInstance(FamilyFarmFactory.class);
    Farm pops = factory.popsFarm("Pop");
    assertEquals("Pop", pops.pop);
    assertEquals(null, pops.mom);
    Farm moms = factory.momsFarm("Mom");
    assertEquals(null, moms.pop);
    assertEquals("Mom", moms.mom);
    Farm momAndPop = factory.momAndPopsFarm("Mom", "Pop");
    assertEquals("Pop", momAndPop.pop);
    assertEquals("Mom", momAndPop.mom);
  }
  

  public static interface FamilyFarmFactory {
    Farm popsFarm(String pop);
    Farm momsFarm(@Assisted("mom") String mom);
    Farm momAndPopsFarm(@Assisted("mom") String mom, @Assisted("pop") String pop);
  }
  
  public static class Farm {
    String pop;
    String mom;
    
    @AssistedInject Farm(@Assisted String pop, Dog dog) {
      this.pop = pop;
    }
    
    @AssistedInject Farm(@Assisted("mom") String mom, @Assisted("pop") String pop, Cow cow, Dog dog) {
      this.pop = pop;
      this.mom = mom;
    }
    
    @AssistedInject Farm(@Assisted("mom") String mom, Cow cow) {
      this.mom = mom;
    }
  }
  
  public static class Cow {}
  public static class Dog {}
  
}

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