Examples with RationalConverter tec.uom.se.function.RationalConverter used on opensource projects

Example 1 with RationalConverter

use of tec.uom.se.function.RationalConverter in project n2a by frothga.

the class ImportJob method unit.

@SuppressWarnings({ "rawtypes", "unchecked" })
public void unit(Node node) {
    String symbol = getAttribute(node, "symbol");
    String dimension = getAttribute(node, "dimension");
    int power = getAttribute(node, "power", 0);
    double scale = getAttribute(node, "scale", 1.0);
    double offset = getAttribute(node, "offset", 0.0);
    Unit unit = dimensions.get(dimension);
    // fall back, but in general something is broken about the file
    if (unit == null)
        unit = AbstractUnit.ONE;
    if (power > 0)
        unit = unit.transform(new RationalConverter(BigInteger.TEN.pow(power), BigInteger.ONE));
    else if (power < 0)
        unit = unit.transform(new RationalConverter(BigInteger.ONE, BigInteger.TEN.pow(-power)));
    else {
        if (scale == 1.0) {
            unit = unit.shift(offset);
        } else {
            // UCUM only allows rational numbers, so convert scale
            RationalConverter ratio = null;
            if (scale < 1.0) {
                // Attempt to find a simple ratio of 1/integer
                double inverse = 1.0 / scale;
                long integer = Math.round(inverse);
                if (Math.abs(inverse - integer) < epsilon)
                    ratio = new RationalConverter(1, integer);
            }
            if (ratio == null) {
                String s = getAttribute(node, "scale").toLowerCase();
                String[] pieces = s.split("e");
                int shift = 0;
                if (pieces.length > 1)
                    shift = Integer.valueOf(pieces[1]);
                pieces = pieces[0].split(".");
                if (pieces.length > 1) {
                    shift -= pieces[1].length();
                    s = pieces[0] + pieces[1];
                }
                BigInteger numerator = new BigInteger(s);
                BigInteger denominator = new BigDecimal(10).pow(shift).toBigInteger();
                ratio = new RationalConverter(numerator, denominator);
            }
            unit = unit.transform(ratio).shift(offset);
        }
    }
    // Since LEMS and NeuroML tend to follow certain naming practices, we may be able to retrieve
    // a more parsimonious unit based on direct name translation.
    String tempName = symbol;
    tempName = tempName.replace("_per_", "/");
    tempName = tempName.replace("per_", "/");
    tempName = tempName.replace("_", ".");
    tempName = tempName.replace("ohm", "Ohm");
    tempName = tempName.replace("hour", "h");
    Unit temp = null;
    try {
        temp = UCUM.parse(tempName);
    } catch (ParserException | TokenException e) {
    }
    if (// found a unit with matching dimension ...
    temp != null && temp.isCompatible(unit)) {
        Number tempScale = temp.getConverterTo(temp.getSystemUnit()).convert(new Integer(1));
        Number unitScale = temp.getConverterTo(unit.getSystemUnit()).convert(new Integer(1));
        if (// ... and matching scale ...
        tempScale.equals(unitScale)) {
            int unitLength = UCUM.format(unit).length();
            int tempLength = UCUM.format(temp).length();
            if (// ... and at least as parsimonious
            tempLength <= unitLength) {
                unit = temp;
                // Update dimension if this is directly equivalent, but strictly more parsimonious
                if (power == 0 && scale == 1 && offset == 0 && tempLength < unitLength) {
                    dimensions.put(dimension, temp);
                }
            }
        }
    }
    if (ExpressionParser.namedUnits == null)
        ExpressionParser.namedUnits = new HashMap<String, Unit<?>>();
    ExpressionParser.namedUnits.put(symbol, unit);
}