Package org.rhq.core.domain.measurement.composite

Examples of org.rhq.core.domain.measurement.composite.MeasurementNumericValueAndUnits


            wasNegative = true;
            origin = -origin;
        }

        MeasurementUnits baseUnit = targetUnits.getBaseUnits();
        MeasurementNumericValueAndUnits valueAndUnits = new MeasurementNumericValueAndUnits(origin, baseUnit);

        Double results = scale(valueAndUnits, targetUnits);
        if (wasNegative) {
            results = -results;
        }
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                * error, but prevents overflow on large data sets
                */
                average += (values[i] / sz);
            }

            MeasurementNumericValueAndUnits fittedAverage = fit(average, targetUnits);
            //noinspection UnnecessaryLocalVariable
            MeasurementUnits fittedUnits = fittedAverage.getUnits();

            /*
            * and change the local reference to targetUnits, so that the same logic
            * can be used both for the bestFit and non-bestFit computations
            */
            targetUnits = fittedUnits;
        }

        @SuppressWarnings("unused")
        Set<String> existingStrings; // technically this *is* unused because
        int precisionDigits = 0;
        boolean scaleWithMorePrecision = true;
        String[] results = new String[values.length];
        NumberFormat nf = getDefaultNumberFormat();

        /*
        * we scale at most to MAX_PRECISION_DIGITS to allow for presentation limits
        *
        * increase the maxPrecisionDigits in the while condition
        * itself to ensure it gets done for every loop
        */
        while (scaleWithMorePrecision && (++precisionDigits <= MAX_PRECISION_DIGITS)) {
            /*
            * make the assumption that we no longer need to scale beyond this iteration
            */
            scaleWithMorePrecision = false;

            /*
            * we need to record the uniquely formatted values so we can determine
            */
            existingStrings = new HashSet<String>();
            nf.setMinimumFractionDigits(0);
            nf.setMaximumFractionDigits(precisionDigits);

            Double[] scaledValues = new Double[values.length];

            for (int i = 0; i < scaledValues.length; i++) {
                /*
                *  For relative units apply the scale now, prior to the nf.format(), since we are not using format( Double...).
                *  Otherwise, apply standard multi-unit scaling.
                */
                if (MeasurementUnits.Family.RELATIVE == originalUnits.getFamily()) {
                    scaledValues[i] = MeasurementUnits.scaleUp(values[i], originalUnits);
                } else {
                    scaledValues[i] = scale(new MeasurementNumericValueAndUnits(values[i], originalUnits), targetUnits);
                }
            }

            for (int i = 0; i < results.length; i++) {
                /*
 
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                                Integer minimumFractionDigits, Integer maximumFractionDigits) {
        if (value == null || Double.isNaN(value)) {
            return NULL_OR_NAN_FORMATTED_VALUE;
        }
        if (bestFit) {
            MeasurementNumericValueAndUnits valueAndUnits = fit(value, targetUnits);

            value = valueAndUnits.getValue();
            targetUnits = valueAndUnits.getUnits();
        }

        // apply relative scale at presentation time
        if (MeasurementUnits.Family.RELATIVE == targetUnits.getFamily()) {
            value = MeasurementUnits.scaleUp(value, targetUnits);
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    public static String scaleAndFormat(Double origin, MeasurementUnits targetUnits, boolean bestFit,
                                        Integer minimumFractionDigits, Integer maximumFractionDigits) throws MeasurementConversionException {

        MeasurementUnits baseUnits = targetUnits.getBaseUnits();
        MeasurementNumericValueAndUnits valueAndUnits = new MeasurementNumericValueAndUnits(origin, baseUnits);
        Double scaledMagnitude = scale(valueAndUnits, targetUnits);

        return format(scaledMagnitude, targetUnits, bestFit);
    }
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    public static MeasurementNumericValueAndUnits fit(Double origin, MeasurementUnits units, MeasurementUnits lowUnits,
                                                      MeasurementUnits highUnits) {

        // work-around for the various Chart descendants not properly setting their units field;
        if (null == units) {
            return new MeasurementNumericValueAndUnits(origin, units);
        }

        // by definition, absolutely specified units don't scale to anything
        if ((MeasurementUnits.Family.ABSOLUTE == units.getFamily())
                || (MeasurementUnits.Family.DURATION == units.getFamily())) {
            return new MeasurementNumericValueAndUnits(origin, units);
        }

        // by definition relative-valued units are self-scaled (converted at formatting)
        if (MeasurementUnits.Family.RELATIVE == units.getFamily()) {
            return new MeasurementNumericValueAndUnits(origin, units);
        }

        if (MeasurementUnits.Family.TEMPERATURE == units.getFamily()) {
            return new MeasurementNumericValueAndUnits(origin, units);
        }

        // if the magnitude is zero, the best-fit also will spin around forever since it won't change
        if (Math.abs(origin) < 1e-9) {
            return new MeasurementNumericValueAndUnits(origin, units);
        }

        boolean wasNegative = false;

        if (origin < 0) {
            wasNegative = true;
            origin = -origin;
        }

        MeasurementNumericValueAndUnits currentValueAndUnits;
        MeasurementNumericValueAndUnits nextValueAndUnits = new MeasurementNumericValueAndUnits(origin, units);

        // first, make the value smaller if it's too big
        int maxOrdinal = (highUnits != null) ? (highUnits.ordinal() + 1) : MeasurementUnits.values().length;

        do {
            currentValueAndUnits = nextValueAndUnits;

            int nextOrdinal = currentValueAndUnits.getUnits().ordinal() + 1;
            if (nextOrdinal == maxOrdinal) {
                // we could theoretically get bigger, but we don't have any units to represent that
                break;
            }

            MeasurementUnits biggerUnits = MeasurementUnits.values()[nextOrdinal];
            if (biggerUnits.getFamily() != currentValueAndUnits.getUnits().getFamily()) {
                // we're as big as we can get, break out of the loop so we can return
                break;
            }

            Double smallerValue = scale(currentValueAndUnits, biggerUnits);

            nextValueAndUnits = new MeasurementNumericValueAndUnits(smallerValue, biggerUnits);
        } while (nextValueAndUnits.getValue() > 1.0);

        // next, make the value bigger if it's too small
        int minOrdinal = (lowUnits != null) ? (lowUnits.ordinal() - 1) : -1;

        while (currentValueAndUnits.getValue() < 1.0) {
            int nextOrdinal = currentValueAndUnits.getUnits().ordinal() - 1;
            if (nextOrdinal == minOrdinal) {
                // we could theoretically get smaller, but we don't have any units to represent that
                break;
            }

            MeasurementUnits smallerUnits = MeasurementUnits.values()[nextOrdinal];
            if (smallerUnits.getFamily() != currentValueAndUnits.getUnits().getFamily()) {
                // we're as small as we can get, break out of the loop so we can return
                break;
            }

            Double biggerValue = scale(currentValueAndUnits, smallerUnits);

            nextValueAndUnits = new MeasurementNumericValueAndUnits(biggerValue, smallerUnits);

            currentValueAndUnits = nextValueAndUnits;
        }

        if (wasNegative) {
            return new MeasurementNumericValueAndUnits(-currentValueAndUnits.getValue(), currentValueAndUnits
                    .getUnits());
        }

        return currentValueAndUnits;
    }
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