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rx-java Observables for jdbc

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package com.github.davidmoten.rx.jdbc;

import static com.github.davidmoten.rx.OperationToOperator.toOperator;

import java.sql.ResultSet;

import rx.Observable;
import rx.Observable.Operator;
import rx.Subscriber;
import rx.functions.Func1;

/**
 * Operator corresponding to the QuerySelectOperation.
 * 
 * @param 
 */
final class QuerySelectOperator implements Operator {

	private final Operator operator;

	/**
	 * Constructor.
	 * 
	 * @param builder
	 * @param function
	 * @param operatorType
	 */
	QuerySelectOperator(final QuerySelect.Builder builder,
			final Func1 function, final OperatorType operatorType) {
		operator = toOperator(new Func1, Observable>() {

			@Override
			public Observable call(Observable observable) {
				if (operatorType == OperatorType.PARAMETER)
					return builder.parameters(observable).get(function);
				else if (operatorType == OperatorType.DEPENDENCY)
					// dependency
					return builder.dependsOn(observable).get(function);
				else // PARAMETER_LIST
				{
					@SuppressWarnings("unchecked")
					Observable> obs = (Observable>) observable;
					return obs
							.concatMap(new Func1, Observable>() {
								@Override
								public Observable call(
										Observable