VariableΒΆ

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/**
 * 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.miscellaneous;

import static net.sf.dynamicreports.report.builder.DynamicReports.*;

import java.math.BigDecimal;
import java.util.List;

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.expression.AbstractComplexExpression;
import net.sf.dynamicreports.report.constant.Calculation;
import net.sf.dynamicreports.report.constant.Evaluation;
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 VariableReport {

	public VariableReport() {
		build();
	}

	private void build() {
		TextColumnBuilder<String> itemColumn = col.column("Item", "item", type.stringType());
		TextColumnBuilder<Integer> quantityColumn = col.column("Quantity", "quantity", type.integerType());
		TextColumnBuilder<BigDecimal> unitPriceColumn = col.column("Unit price", "unitprice", type.bigDecimalType());

		VariableBuilder<Integer> itemCount = variable(itemColumn, Calculation.COUNT);
		VariableBuilder<Integer> quantitySum = variable("quantitySum", quantityColumn, Calculation.SUM);
		VariableBuilder<Integer> priceSum = variable(new PriceExpression(quantityColumn, unitPriceColumn), Calculation.SUM);

		try {
			report()
					.setTemplate(Templates.reportTemplate)
					.variables(quantitySum)
					.columns(
							itemColumn, quantityColumn, unitPriceColumn)
					.title(
							Templates.createTitleComponent("Variable"),
							cmp.horizontalList(cmp.text("Item count =").setFixedWidth(80), cmp.text(itemCount)),
							cmp.text(new QuantitySumTextExpression()).setEvaluationTime(Evaluation.REPORT),
							cmp.text(new UnitPriceSumTextExpression(unitPriceColumn)),
							cmp.horizontalList(cmp.text("SUM(quantity * unit price) =").setFixedWidth(150), cmp.text(priceSum).setPattern("#,###.00")))
					.pageFooter(Templates.footerComponent)
					.setDataSource(createDataSource())
					.show();
		} catch (DRException e) {
			e.printStackTrace();
		}
	}

	private JRDataSource createDataSource() {
		DRDataSource dataSource = new DRDataSource("item", "quantity", "unitprice");
		for (int i = 0; i < 30; i++) {
			dataSource.add("Book", (int) (Math.random() * 10) + 1, new BigDecimal(Math.random() * 100 + 1));
		}
		return dataSource;
	}

	public static void main(String[] args) {
		new VariableReport();
	}

	private class QuantitySumTextExpression extends AbstractSimpleExpression<String> {
		private static final long serialVersionUID = 1L;

		@Override
		public String evaluate(ReportParameters reportParameters) {
			Integer quantitySum = reportParameters.getValue("quantitySum");
			return "Quantity sum = " + quantitySum;
		}
	}

	private class UnitPriceSumTextExpression extends AbstractComplexExpression<String> {
		private static final long serialVersionUID = 1L;

		public UnitPriceSumTextExpression(TextColumnBuilder<BigDecimal> unitPriceColumn) {
			addExpression(variable(unitPriceColumn, Calculation.SUM));
		}

		@Override
		public String evaluate(List<?> values, ReportParameters reportParameters) {
			BigDecimal unitPriceSum = (BigDecimal) values.get(0);
			return "Unit price sum = " + type.bigDecimalType().valueToString(unitPriceSum, reportParameters.getLocale());
		}
	}

	private class PriceExpression extends AbstractSimpleExpression<BigDecimal> {
		private static final long serialVersionUID = 1L;

		private TextColumnBuilder<Integer> quantityColumn;
		private TextColumnBuilder<BigDecimal> unitPriceColumn;

		public PriceExpression(TextColumnBuilder<Integer> quantityColumn, TextColumnBuilder<BigDecimal> unitPriceColumn) {
			this.quantityColumn = quantityColumn;
			this.unitPriceColumn = unitPriceColumn;
		}

		@Override
		public BigDecimal evaluate(ReportParameters reportParameters) {
			Integer quantity = reportParameters.getValue(quantityColumn);
			BigDecimal unitPrice = reportParameters.getValue(unitPriceColumn);
			return unitPrice.multiply(new BigDecimal(quantity));
		}
	}
}