001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.rng.sampling.distribution; 018 019import org.apache.commons.rng.UniformRandomProvider; 020 021/** 022 * Base class for a sampler. 023 */ 024public class SamplerBase { 025 /** RNG. */ 026 private final UniformRandomProvider rng; 027 028 /** 029 * @param rng Generator of uniformly distributed random numbers. 030 */ 031 protected SamplerBase(UniformRandomProvider rng) { 032 this.rng = rng; 033 } 034 035 /** 036 * @return a random value from a uniform distribution in the 037 * interval {@code [0, 1)}. 038 */ 039 protected double nextDouble() { 040 return rng.nextDouble(); 041 } 042 043 /** 044 * @return a random {@code int} value. 045 */ 046 protected int nextInt() { 047 return rng.nextInt(); 048 } 049 050 /** 051 * @param max Upper bound (excluded). 052 * @return a random {@code int} value in the interval {@code [0, max)}. 053 */ 054 protected int nextInt(int max) { 055 return rng.nextInt(max); 056 } 057 058 /** {@inheritDoc} */ 059 @Override 060 public String toString() { 061 return "rng=" + rng.toString(); 062 } 063}