LoadCommand.java :  » Google-tech » twig-persist » com » vercer » engine » persist » Java Open Source

package com.vercer.engine.persist;

import java.util.Map;
import java.util.Collection;
import java.util.concurrent.Future;

import com.google.appengine.api.datastore.Entity;

public interface LoadCommand
{
  interface TypedLoadCommand<T>
  {
    SingleTypedLoadCommand<T> id(Object id);
    <K> MultipleTypedLoadCommand<T, K> ids(Collection<? extends K> ids);
    <K> MultipleTypedLoadCommand<T, K> ids(K... ids);
  }

  interface BaseTypedLoadCommand<T, C extends BaseTypedLoadCommand<T, C>>
  {
    C restrictEntities(Restriction<Entity> restriction);
    C restrictProperties(Restriction<Property> restriction);
  }
  
  interface SingleTypedLoadCommand<T> extends BaseTypedLoadCommand<T, SingleTypedLoadCommand<T>>
  {
    T returnResultNow();
    Future<T> returnResultLater();
  }
  
  interface MultipleTypedLoadCommand<T, K> extends BaseTypedLoadCommand<T, MultipleTypedLoadCommand<T, K>>
  {
    Map<? super K, ? super T> returnResultsNow();
    Future<Map<? super K, ? super T>> returnResultsLater();
  }

  <T> TypedLoadCommand<T> type(Class<T> type);
}