/**

  * Back 2 Browser Bytecode Translator

  * Copyright (C) 2012-2015 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, version 2 of the License.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program. Look for COPYING file in the top folder.

  * If not, see http://opensource.org/licenses/GPL-2.0.

  */

 package org.apidesign.benchmark.sieve;

 abstract class Primes {

     private final Natural natural;

     private Filter filter;

     protected Primes() {

         this.natural = new Natural();

     }

     int next() {

         for (;;) {

             int n = natural.next();

             if (filter == null || filter.accept(n)) {

                 filter = new Filter(n, filter);

                 return n;

             }

         }

     }

     protected abstract void log(String msg);

     public final int compute(int count) {

         int cnt = 0;

         int res;

         for (;;) {

             res = next();

             cnt += 1;

             if (cnt % 1000 == 0) {

                 log("Computed " + cnt + " primes. Last one is " + res);

             }

             if (cnt >= count) {

                 break;

             }

         }

         return res;

     }

 }