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Jinq public API for extending Java 8 streams with database functionality

There is a newer version: 2.0.2

package ch.epfl.labos.iu.orm;

import java.util.Iterator;
import java.util.function.Consumer;
import java.util.function.Predicate;

import org.jinq.orm.stream.JinqStream;
import org.jinq.tuples.Pair;

import ch.epfl.labos.iu.orm.DBSet.AggregateDouble;
import ch.epfl.labos.iu.orm.DBSet.AggregateGroup;
import ch.epfl.labos.iu.orm.DBSet.AggregateInteger;
import ch.epfl.labos.iu.orm.DBSet.AggregateSelect;
import ch.epfl.labos.iu.orm.DBSet.Join;
import ch.epfl.labos.iu.orm.DBSet.Select;
import ch.epfl.labos.iu.orm.DBSet.Where;

public interface QueryComposer
{
   public String getDebugQueryString();
   
   // Actually executes the query and returns the results in an iterator
   public Iterator executeAndReturnResultIterator(Consumer exceptionReporter);
   
   // Returns a new query with the given operation integrated in
   // (or returns null if the given operation cannot be integrated)
   public QueryComposer with(T toAdd);
   public QueryComposer sortedByInt(final IntSorter sorter, boolean isAscending);
   public QueryComposer sortedByDouble(final DoubleSorter sorter, boolean isAscending);
   public QueryComposer sortedByString(final StringSorter sorter, boolean isAscending);
   public QueryComposer sortedByDate(final DateSorter sorter, boolean isAscending);
   public QueryComposer firstN(int n);
   
   // New stuff for Queryll2
   public  QueryComposer where(JinqStream.Where test);
   public  QueryComposer select(JinqStream.Select select);
   public  QueryComposer> join(JinqStream.Join join);
   public QueryComposer unique();
   public  QueryComposer> group(JinqStream.Select select, JinqStream.AggregateGroup aggregate);

   // returns null if the aggregates cannot be calculated
   public Double sumDouble(JinqStream.AggregateDouble aggregate);
   public Integer sumInt(JinqStream.AggregateInteger aggregate);
   public Double maxDouble(JinqStream.AggregateDouble aggregate);
   public Integer maxInt(JinqStream.AggregateInteger aggregate);
   public  U selectAggregates(JinqStream.AggregateSelect aggregate);
   
   public Object[] multiaggregate(JinqStream.AggregateSelect[] aggregates);
   
   public void setHint(String name, Object val);
}