001/*
002 * Units of Measurement Systems
003 * Copyright (c) 2005-2017, Jean-Marie Dautelle, Werner Keil and others.
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-363, Units of Measurement nor the names of their contributors may be used to
017 *    endorse or promote products 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 systems.uom.common.internal;
031
032import java.util.Collection;
033import java.util.HashMap;
034import java.util.Map;
035
036import javax.measure.spi.SystemOfUnits;
037import javax.measure.spi.SystemOfUnitsService;
038
039import systems.uom.common.CGS;
040import systems.uom.common.Imperial;
041import systems.uom.common.USCustomary;
042import tec.uom.lib.common.function.IntPrioritySupplier;
043
044/**
045 * @author <a href="mailto:units@catmedia.us">Werner Keil</a>
046 * @version 0.7, March 4, 2017
047 */
048public class CommonSystemService implements SystemOfUnitsService,
049        IntPrioritySupplier {
050    static final int PRIO = 100;
051    private static final String DEFAULT_SYSTEM_NAME = "USCustomary";
052
053    private final Map<String, SystemOfUnits> souMap = new HashMap<>();
054    private final Map<String, String> aliases = new HashMap<>();
055
056    public CommonSystemService() {
057        souMap.put("Imperial", Imperial.getInstance());
058        souMap.put(DEFAULT_SYSTEM_NAME, USCustomary.getInstance());
059        souMap.put("CGS", CGS.getInstance());
060        aliases.put("US", DEFAULT_SYSTEM_NAME);
061        aliases.put("Centimetre–gram–second", "CGS");
062    }
063
064    public Collection<SystemOfUnits> getAvailableSystemsOfUnits() {
065        return souMap.values();
066    }
067
068    @Override
069    public SystemOfUnits getSystemOfUnits() {
070        return getSystemOfUnits(DEFAULT_SYSTEM_NAME); 
071        // We assume US Customary as the more common system here
072    }
073
074    @Override
075    public SystemOfUnits getSystemOfUnits(String name) {
076        String alias = aliases.get(name);
077        if (alias != null && alias.length() > 0) {
078            return souMap.get(alias);
079        }
080        return souMap.get(name);
081    }
082
083    @Override
084    public int getPriority() {
085        return PRIO;
086    }
087}