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package com.querydsl.core;

import com.querydsl.core.types.Expression;
import org.reactivestreams.Publisher;

/**
 * {@code FetchableQuery} extends {@link ReactiveFetchable} and {@link SimpleQuery} with projection
 * changing methods and result aggregation functionality using {@link ResultTransformer} instances.
 *
 * @param  element type
 * @param  concrete subtype
 */
public interface ReactiveFetchableQuery>
    extends SimpleQuery, ReactiveFetchable {

  /**
   * Change the projection of this query
   *
   * @param 
   * @param expr new projection
   * @return the current object
   */
   ReactiveFetchableQuery select(Expression expr);

  /**
   * Change the projection of this query
   *
   * @param exprs new projection
   * @return the current object
   */
  ReactiveFetchableQuery select(Expression... exprs);

  /**
   * Apply the given transformer to this {@code ReactiveFetchableQuery} instance and return the
   * results
   *
   * @param 
   * @param transformer result transformer
   * @return transformed result
   */
   Publisher transform(ReactiveResultTransformer transformer);
}