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/**
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* SQL-DK
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* Copyright © 2015 František Kučera (frantovo.cz)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package info.globalcode.sql.dk.formatting;
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import info.globalcode.sql.dk.Functions;
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import info.globalcode.sql.dk.configuration.PropertyDeclaration;
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import info.globalcode.sql.dk.logging.LoggerProducer;
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import java.math.BigDecimal;
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import java.math.MathContext;
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import java.math.RoundingMode;
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import java.util.List;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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/**
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* TODO: min/max values – range for case that no value is 100 %
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*
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* TODO: multiple barcharts in same table (last column is still default) + multiple resultsets
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*
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* TODO: negative values - bar starting from the middle, not always from the left
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*
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* @author Ing. František Kučera (frantovo.cz)
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*/
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@PropertyDeclaration(name = BarChartFormatter.PROPERTY_PRECISION, type = Integer.class, defaultValue = BarChartFormatter.PROPERTY_PRECISION_DEFAULT, description = "number of characters representing 100 % in the bar chart")
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public class BarChartFormatter extends TabularPrefetchingFormatter {
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public static final String NAME = "barchart"; // bash-completion:formatter
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public static final String PROPERTY_PRECISION = "precision";
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protected static final String PROPERTY_PRECISION_DEFAULT = "100";
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private static final MathContext mathContext = MathContext.DECIMAL128;
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public static final Logger log = LoggerProducer.getLogger();
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private final BigDecimal chartPrecision;
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private final char chartFull;
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private final char chartEmpty;
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public BarChartFormatter(FormatterContext formatterContext) {
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super(formatterContext);
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chartPrecision = BigDecimal.valueOf(formatterContext.getProperties().getInteger(PROPERTY_PRECISION, Integer.parseInt(PROPERTY_PRECISION_DEFAULT)));
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chartFull = isAsciiNostalgia() ? '#' : '█';
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chartEmpty = isAsciiNostalgia() ? '~' : '░';
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// TODO: consider using partial blocks for more precision: https://en.wikipedia.org/wiki/Block_Elements
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}
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@Override
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protected void postprocessPrefetchedResultSet(ColumnsHeader currentHeader, List<Object[]> currentResultSet) {
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super.postprocessPrefetchedResultSet(currentHeader, currentResultSet);
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updateColumnWidth(currentHeader.getColumnCount(), chartPrecision.intValue());
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BigDecimal maximum = BigDecimal.ZERO;
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BigDecimal minimum = BigDecimal.ZERO;
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int lastIndex = currentHeader.getColumnCount() - 1;
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Object valueObject = null;
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try {
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for (Object[] row : currentResultSet) {
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valueObject = row[lastIndex];
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if (valueObject != null) {
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BigDecimal value = new BigDecimal(valueObject.toString());
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maximum = maximum.max(value);
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minimum = minimum.min(value);
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}
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}
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BigDecimal range = maximum.subtract(minimum);
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for (Object[] row : currentResultSet) {
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valueObject = row[lastIndex];
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if (valueObject == null) {
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row[lastIndex] = "";
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} else {
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BigDecimal value = new BigDecimal(valueObject.toString());
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BigDecimal valueFromMinimum = value.subtract(minimum);
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BigDecimal points = chartPrecision.divide(range, mathContext).multiply(valueFromMinimum, mathContext);
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int pointsRounded = points.setScale(0, RoundingMode.HALF_UP).intValue();
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row[lastIndex] = Functions.repeat(chartFull, pointsRounded) + Functions.repeat(chartEmpty, chartPrecision.intValue() - pointsRounded);
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}
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}
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} catch (NumberFormatException e) {
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// https://en.wiktionary.org/wiki/parsable
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log.log(Level.SEVERE, "Last column must be number or an object with toString() value parsable to a number. But was „{0}“", valueObject);
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// FIXME: throw FormatterException
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throw e;
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}
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}
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}
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