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rx-java Observables for jdbc

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package com.github.davidmoten.rx;

import rx.Observable;
import rx.Observable.Operator;
import rx.Subscriber;
import rx.functions.Func1;
import rx.observers.Subscribers;
import rx.subjects.PublishSubject;

/**
 * Converts an Operation (a function converting one Observable into another)
 * into an {@link Operator}.
 * 
 * @param 
 *            to type
 * @param 
 *            from type
 */
public final class OperationToOperator implements Operator {

    public static  Operator toOperator(Func1, Observable> operation) {
        return new OperationToOperator(operation);
    }

    /**
     * The operation to convert.
     */
    private final Func1, Observable> operation;

    /**
     * Constructor.
     * 
     * @param operation
     *            to be converted into {@link Operator}
     */
    public OperationToOperator(Func1, Observable> operation) {
        this.operation = operation;
    }

    @Override
    public Subscriber call(Subscriber subscriber) {
        final PublishSubject subject = PublishSubject.create();
        Subscriber result = Subscribers.from(subject);
        subscriber.add(result);
        operation.call(subject).unsafeSubscribe(subscriber);
        return result;
    }

}