001/* 002 * Units of Measurement Reference Implementation 003 * Copyright (c) 2005-2020, Units of Measurement project. 004 * 005 * All rights reserved. 006 * 007 * Redistribution and use in source and binary forms, with or without modification, 008 * are permitted provided that the following conditions are met: 009 * 010 * 1. Redistributions of source code must retain the above copyright notice, 011 * this list of conditions and the following disclaimer. 012 * 013 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions 014 * and the following disclaimer in the documentation and/or other materials provided with the distribution. 015 * 016 * 3. Neither the name of JSR-385, Indriya nor the names of their contributors may be used to endorse or promote products 017 * derived from this software without specific prior written permission. 018 * 019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 020 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 021 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 022 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE 023 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 026 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 028 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 029 */ 030package tech.units.indriya.function; 031 032import java.util.function.Supplier; 033import java.util.stream.Collector; 034 035import javax.measure.Quantity; 036import javax.measure.Unit; 037 038/** 039 * Utility methods for operating on quantities using streams. 040 * 041 * @author Otavio 042 * @author Werner 043 * @version 1.0 044 * @since 2.0 045 * 046 */ 047public final class QuantityStreams { 048 049 private QuantityStreams() { 050 throw new Error("no instances"); 051 } 052 053 /** 054 * Summary of Quantity 055 * 056 * @return the QuantitySummaryStatistics 057 */ 058 public static <Q extends Quantity<Q>> Collector<Quantity<Q>, QuantitySummaryStatistics<Q>, QuantitySummaryStatistics<Q>> summarizeQuantity( 059 Unit<Q> unit) { 060 Supplier<QuantitySummaryStatistics<Q>> supplier = () -> new QuantitySummaryStatistics<>(unit); 061 return Collector.of(supplier, QuantitySummaryStatistics<Q>::accept, QuantitySummaryStatistics<Q>::combine); 062 } 063}