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Unit System supporting the Unified Code for Units of Measure (UCUM)
There is a newer version: 2.1
/*
 * Units of Measurement Systems
 * Copyright (c) 2005-2017, Jean-Marie Dautelle, Werner Keil and others.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions
 *    and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of JSR-363, Units of Measurement nor the names of their contributors may be used to
 *    endorse or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package systems.uom.ucum.spi;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import javax.measure.spi.SystemOfUnits;
import javax.measure.spi.SystemOfUnitsService;

import systems.uom.ucum.UCUM;
import tech.uom.lib.common.function.IntPrioritySupplier;

/**
 * @author Werner Keil
 * @version 1.0, October 20, 2019
 */
public final class UCUMSystemService implements SystemOfUnitsService,
	IntPrioritySupplier {
    static final int PRIO = 100;
    private static final String DEFAULT_SYSTEM_NAME = "UCUM";

    private final Map souMap = new HashMap<>();
    private final Map aliases = new HashMap<>();

    UCUMSystemService() {
	souMap.put(DEFAULT_SYSTEM_NAME, UCUM.getInstance());
	aliases.put("Unified Code for Units of Measure", DEFAULT_SYSTEM_NAME);
    }

    public Collection getAvailableSystemsOfUnits() {
	return souMap.values();
    }

    @Override
    public SystemOfUnits getSystemOfUnits() {
	return getSystemOfUnits(DEFAULT_SYSTEM_NAME); 
    }

    @Override
    public SystemOfUnits getSystemOfUnits(String name) {
	String alias = aliases.get(name);
	if (alias != null && alias.length() > 0) {
	    return souMap.get(alias);
	}
	return souMap.get(name);
    }

    @Override
    public int getPriority() {
	return PRIO;
    }
}