de.gsi.chart.utils.ScientificNotationStringConverter Maven / Gradle / Ivy

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package de.gsi.chart.utils;

/*****************************************************************************
 * *
 * BI Common - convert Number <-> String *
 * *
 * modified: 2017-04-25 Harald Braeuning *
 * *
 ****************************************************************************/

import java.text.DecimalFormat;

import javafx.util.StringConverter;

/**
 * @author braeun
 */
public class ScientificNotationStringConverter extends StringConverter implements NumberFormatter {
    private int precision = 2;
    private final DecimalFormat format = new DecimalFormat();

    public ScientificNotationStringConverter() {
        buildFormat(precision);
    }

    public ScientificNotationStringConverter(final int precision) {
        this.precision = precision;
        buildFormat(precision);
    }

    private void buildFormat(final int precision) {
        final StringBuilder sb = new StringBuilder(32);
        sb.append("0.");
        sb.append("0".repeat(Math.max(0, precision)));
        sb.append("E0");
        format.applyPattern(sb.toString());
    }

    @Override
    public Number fromString(final String string) {
        return Double.parseDouble(string);
    }

    @Override
    public int getPrecision() {
        return precision;
    }

    @Override
    public boolean isExponentialForm() {
        return true;
    }

    @Override
    public NumberFormatter setExponentialForm(boolean state) {
        return this;
    }

    @Override
    public NumberFormatter setPrecision(final int precision) {
        this.precision = precision;
        buildFormat(precision);
        return this;
    }

    @Override
    public String toString(double val) {
        return toString(Double.valueOf(val));
    }

    @Override
    public String toString(final Number object) {
        return format.format(object);
    }
}