Examples of com.google.inject.Module

com.google.inject.Module
A module contributes configuration information, typically interface bindings, which will be used to create an {@link Injector}. A guice-based application is ultimately composed of little more than a set of {@code Module}s and some bootstrapping code.
Your Module classes can use a more streamlined syntax by extending {@link AbstractModule} rather than implementing this interface directly.

      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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          "at " + module.getClass().getName() + ".configure(");
    }
  }  
  
  public void testDifferentBindingsFail_both() {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class).setDefault().toInstance("a");
        OptionalBinder.newOptionalBinder(binder(), String.class).setDefault().toInstance("b");
        OptionalBinder.newOptionalBinder(binder(), String.class).setBinding().toInstance("b");
        OptionalBinder.newOptionalBinder(binder(), String.class).setBinding().toInstance("c");
      }
    };
    try {
      Guice.createInjector(module);
      fail();
    } catch (CreationException ce) {
      assertEquals(ce.getMessage(), 2, 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(",
          "2) 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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          "at " + module.getClass().getName() + ".configure(");
    }
  }
  
  public void testQualifiedAggregatesTogether() throws Exception {
    Module module1 = new AbstractModule() {
      @Override
      protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), Key.get(String.class, Names.named("foo")));
      }
    };
    Module module2 = new AbstractModule() {
      @Override
      protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), Key.get(String.class, Names.named("foo")))
            .setDefault().toInstance("a");
      }
    };
    Module module3 = new AbstractModule() {
      @Override
      protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), Key.get(String.class, Names.named("foo")))
            .setBinding().toInstance("b");
      }

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  }
  
  public void testMultipleDifferentOptionals() {
    final Key<String> bKey = Key.get(String.class, named("b"));
    final Key<String> cKey = Key.get(String.class, named("c"));
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class).setDefault().toInstance("a");
        OptionalBinder.newOptionalBinder(binder(), Integer.class).setDefault().toInstance(1);
        
        OptionalBinder.newOptionalBinder(binder(), bKey).setDefault().toInstance("b");

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    assertOptionalVisitor(bKey, setOf(module), VisitType.BOTH, 3, instance("b"), null, null);
    assertOptionalVisitor(cKey, setOf(module), VisitType.BOTH, 3, instance("c"), null, null);
  }
  
  public void testOptionalIsAppropriatelyLazy() throws Exception {
    Module module = new AbstractModule() {
      int nextValue = 1;
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), Integer.class)
            .setDefault().to(Key.get(Integer.class, Names.named("foo")));
      }

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