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GIN (GWT INjection) brings automatic dependency injection to Google Web Toolkit client-side code. GIN is built on top of Guice and uses (a subset of) Guice's binding language.

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// Copyright 2011 Google Inc. All Rights Reserved.

package com.google.gwt.inject.client.multibindings;

import com.google.gwt.inject.client.multibindings.InternalModule.SingletonInternalModule;
import com.google.inject.Key;
import com.google.inject.Singleton;

/**
 * A module to bind and expose {@link RuntimeBindingsRegistry} for a multibinding key.
 *
 * @param  type of binding
 */
class RuntimeBindingsRegistryModule extends SingletonInternalModule {

  public RuntimeBindingsRegistryModule(Key multibindingKey) {
    super(multibindingKey);
  }

  @SuppressWarnings("unchecked")
  @Override
  protected void configure() {
    // Safe to use unchecked RuntimeBindingsRegistry.class as its new instances are always a valid
    // substitution for any RuntimeBindingsRegistry.
    bindAndExpose(bindingsRegistry()).to(RuntimeBindingsRegistry.class).in(Singleton.class);
  }
}