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Java example source code file (InjectorSpiTest.java)

This example Java source code file (InjectorSpiTest.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, bar, baz, binding, foo, injectorspitest, override, provider, suppresswarnings, testcase, typeliteral, util

The InjectorSpiTest.java Java example source code

package com.google.inject.spi;

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.Provider;
import com.google.inject.TypeLiteral;

import junit.framework.TestCase;

import java.util.Map;

/**
 * @author sberlin@gmail.com (Sam Berlin)
 */
public class InjectorSpiTest extends TestCase {

  public void testExistingBinding() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      @Override
      protected void configure() {
        bind(Foo.class);
        bind(Baz.class);
      }
    });
    // Sanity check -- ensure we return the proper binding for all existing bindings.
    for(Map.Entry<Key> entry : injector.getAllBindings().entrySet()) {
      assertSame(entry.getValue(), injector.getExistingBinding(entry.getKey()));
    }
    
    // Now run through specifics...
    Binding<?> binding;
    
    // 1) non-Provider Foo.class
    binding = injector.getExistingBinding(Key.get(Foo.class));
    assertNotNull(binding);
    assertEquals(Foo.class, binding.getKey().getTypeLiteral().getRawType());
    
    // 2) Provider<Foo> class (should already exist, because Baz @Injects it).
    // the assertTrue is a bit stricter than necessary, but makes sure this works for pre-existing Provider bindings
    assertTrue(injector.getAllBindings().containsKey(Key.get(new TypeLiteral<Provider() {})));
    binding = injector.getExistingBinding(Key.get(new TypeLiteral<Provider() {}));
    assertNotNull(binding);
    assertEquals(Provider.class, binding.getKey().getTypeLiteral().getRawType());
    assertEquals(Foo.class, ((Provider)binding.getProvider().get()).get().getClass());
    
    // 3) non-Provider Baz.class
    binding = injector.getExistingBinding(Key.get(Baz.class));
    assertNotNull(binding);
    assertEquals(Baz.class, binding.getKey().getTypeLiteral().getRawType());
    
    // 4) Provider<Baz> class (should not already exist, because nothing used it yet).
    // the assertFalse is a bit stricter than necessary, but makes sure this works for non-pre-existing Provider bindings
    assertFalse(injector.getAllBindings().containsKey(Key.get(new TypeLiteral<Provider() {})));    
    binding = injector.getExistingBinding(Key.get(new TypeLiteral<Provider() {}));
    assertNotNull(binding);
    assertEquals(Provider.class, binding.getKey().getTypeLiteral().getRawType());
    assertEquals(Baz.class, ((Provider)binding.getProvider().get()).get().getClass());
    
    // 5) non-Provider Bar, doesn't exist.
    assertNull(injector.getExistingBinding(Key.get(Bar.class)));
    
    // 6) Provider Bar, doesn't exist.
    assertNull(injector.getExistingBinding(Key.get(new TypeLiteral<Provider() {})));
  }
  
  private static class Foo {}
  private static class Bar {}
  private static class Baz { @SuppressWarnings("unused") @Inject Provider<Foo> fooP; }
  
}

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