Examples of com.google.inject.AbstractModule

com.google.inject.AbstractModule
A support class for {@link Module}s which reduces repetition and results in a more readable configuration. Simply extend this class, implement {@link #configure()}, and call the inherited methods which mirror those found in {@link Binder}. For example:
```
 public class MyModule extends AbstractModule { protected void configure() { bind(Service.class).to(ServiceImpl.class).in(Singleton.class); bind(CreditCardPaymentService.class); bind(PaymentService.class).to(CreditCardPaymentService.class); bindConstant().annotatedWith(Names.named("port")).to(8080); } } 
```
@author crazybob@google.com (Bob Lee)

      assertEquals(1, ce.getErrorMessages().size());
    }
  } 
  
  public void testOptionalIsAbsentByDefault() throws Exception {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class);
      }
    };

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      assertFalse(optionalJxP.isPresent());
    }
  }
  
  public void testUsesUserBoundValue() throws Exception {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class);
      }
      @Provides String provideString() { return "foo"; }
    };

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      assertEquals("foo", optionalJxP.get().get());
    }
  }
  
  public void testSetDefault() throws Exception {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class).setDefault().toInstance("a");
      }
    };
    Injector injector = Guice.createInjector(module);

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      assertEquals("a", optionalJxP.get().get());
    }
  }
  
  public void testSetBinding() throws Exception {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class).setBinding().toInstance("a");
      }
    };
    Injector injector = Guice.createInjector(module);

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      assertEquals("a", optionalJxP.get().get());
    }
  }
  
  public void testSetBindingOverridesDefault() throws Exception {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder<String> optionalBinder =
            OptionalBinder.newOptionalBinder(binder(), String.class);
        optionalBinder.setDefault().toInstance("a");
        optionalBinder.setBinding().toInstance("b");

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      assertEquals("b", optionalJxP.get().get());
    }
  }
  
  public void testSpreadAcrossModules() throws Exception {
    Module module1 = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class);
      }
    };
    Module module2 = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class).setDefault().toInstance("a");
      }
    };
    Module module3 = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class).setBinding().toInstance("b");
      }
    };

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      assertEquals("b", optionalJxP.get().get());
    }
  }
  
  public void testExactSameBindingCollapses_defaults() throws Exception {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class).setDefault()
            .toInstance(new String("a")); // using new String to ensure .equals is checked.
        OptionalBinder.newOptionalBinder(binder(), String.class).setDefault()
            .toInstance(new String("a"));

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      assertEquals("a", optionalJxP.get().get());
    }
  }
  
  public void testExactSameBindingCollapses_actual() throws Exception {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class).setBinding()
            .toInstance(new String("a")); // using new String to ensure .equals is checked.
        OptionalBinder.newOptionalBinder(binder(), String.class).setBinding()
            .toInstance(new String("a"));

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      assertEquals("a", optionalJxP.get().get());
    }
  }
  
  public void testDifferentBindingsFail_defaults() {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class).setDefault().toInstance("a");
        OptionalBinder.newOptionalBinder(binder(), String.class).setDefault().toInstance("b");
      }
    };
    try {
      Guice.createInjector(module);
      fail();
    } catch (CreationException ce) {
      assertEquals(ce.getMessage(), 1, ce.getErrorMessages().size());
      assertContains(ce.getMessage(),
          "1) A binding to java.lang.String annotated with @" 
              + Default.class.getName() + " was already configured at "
              + module.getClass().getName() + ".configure(",
          "at " + module.getClass().getName() + ".configure(");
    }
  }

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          "at " + module.getClass().getName() + ".configure(");
    }
  }  
  
  public void testDifferentBindingsFail_actual() {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class).setBinding().toInstance("a");
        OptionalBinder.newOptionalBinder(binder(), String.class).setBinding().toInstance("b");
      }
    };
    try {
      Guice.createInjector(module);
      fail();
    } catch (CreationException ce) {
      assertEquals(ce.getMessage(), 1, ce.getErrorMessages().size());
      assertContains(ce.getMessage(),
          "1) A binding to java.lang.String annotated with @" 
              + Actual.class.getName() + " was already configured at "
              + module.getClass().getName() + ".configure(",
          "at " + module.getClass().getName() + ".configure(");
    }
  }

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