| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.commons.rng.sampling; |
| |
| import java.util.stream.Stream; |
| |
| /** |
| * Sampler that generates values of a specified type. |
| * |
| * @param <T> Type of the sample. |
| * @since 1.4 |
| */ |
| public interface ObjectSampler<T> { |
| /** |
| * Create an object sample. |
| * |
| * @return a sample. |
| */ |
| T sample(); |
| |
| /** |
| * Returns an effectively unlimited stream of object sample values. |
| * |
| * <p>The default implementation produces a sequential stream that repeatedly |
| * calls {@link #sample sample}(). |
| * |
| * @return a stream of object values. |
| * @since 1.5 |
| */ |
| default Stream<T> samples() { |
| return Stream.generate(this::sample).sequential(); |
| } |
| |
| /** |
| * Returns a stream producing the given {@code streamSize} number of object |
| * sample values. |
| * |
| * <p>The default implementation produces a sequential stream that repeatedly |
| * calls {@link #sample sample}(); the stream is limited to the given {@code streamSize}. |
| * |
| * @param streamSize Number of values to generate. |
| * @return a stream of object values. |
| * @since 1.5 |
| */ |
| default Stream<T> samples(long streamSize) { |
| return samples().limit(streamSize); |
| } |
| } |