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103 | /**
* DynamicReports - Free Java reporting library for creating reports dynamically
*
* Copyright (C) 2010 - 2018 Ricardo Mariaca
* http://www.dynamicreports.org
*
* This file is part of DynamicReports.
*
* DynamicReports is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* DynamicReports is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with DynamicReports. If not, see <http://www.gnu.org/licenses/>.
*/
package net.sf.dynamicreports.examples.subtotal;
import static net.sf.dynamicreports.report.builder.DynamicReports.*;
import java.math.BigDecimal;
import net.sf.dynamicreports.examples.Templates;
import net.sf.dynamicreports.report.base.expression.AbstractSimpleExpression;
import net.sf.dynamicreports.report.builder.VariableBuilder;
import net.sf.dynamicreports.report.builder.column.TextColumnBuilder;
import net.sf.dynamicreports.report.builder.subtotal.CustomSubtotalBuilder;
import net.sf.dynamicreports.report.constant.Calculation;
import net.sf.dynamicreports.report.datasource.DRDataSource;
import net.sf.dynamicreports.report.definition.ReportParameters;
import net.sf.dynamicreports.report.exception.DRException;
import net.sf.jasperreports.engine.JRDataSource;
/**
* @author Ricardo Mariaca (r.mariaca@dynamicreports.org)
*/
public class VariableSubtotalReport {
private VariableBuilder<Integer> quantitySum;
private VariableBuilder<BigDecimal> priceSum;
public VariableSubtotalReport() {
build();
}
private void build() {
quantitySum = variable("quantity", Integer.class, Calculation.SUM);
priceSum = variable("price", BigDecimal.class, Calculation.SUM);
TextColumnBuilder<String> itemColumn = col.column("Item", "item", type.stringType());
CustomSubtotalBuilder<BigDecimal> unitPriceSbt = sbt.customValue(new UnitPriceSubtotal(), itemColumn)
.setLabel("sum(price) / sum(quantity)")
.setDataType(type.bigDecimalType());
try {
report()
.setTemplate(Templates.reportTemplate)
.variables(
quantitySum, priceSum)
.columns(
itemColumn)
.subtotalsAtSummary(
unitPriceSbt)
.title(Templates.createTitleComponent("VariableSubtotal"))
.pageFooter(Templates.footerComponent)
.setDataSource(createDataSource())
.show();
} catch (DRException e) {
e.printStackTrace();
}
}
private class UnitPriceSubtotal extends AbstractSimpleExpression<BigDecimal> {
private static final long serialVersionUID = 1L;
@Override
public BigDecimal evaluate(ReportParameters reportParameters) {
Integer quantitySumValue = reportParameters.getValue(quantitySum);
BigDecimal priceSumValue = reportParameters.getValue(priceSum);
return priceSumValue.divide(new BigDecimal(quantitySumValue), 2, BigDecimal.ROUND_HALF_UP);
}
}
private JRDataSource createDataSource() {
DRDataSource dataSource = new DRDataSource("item", "quantity", "price");
dataSource.add("Tablet", 3, new BigDecimal(330));
dataSource.add("Tablet", 1, new BigDecimal(150));
dataSource.add("Laptop", 3, new BigDecimal(900));
dataSource.add("Smartphone", 8, new BigDecimal(720));
dataSource.add("Smartphone", 6, new BigDecimal(720));
return dataSource;
}
public static void main(String[] args) {
new VariableSubtotalReport();
}
}
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