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DynamicReports is an open source Java reporting library based on JasperReports. It allows to create dynamic report designs and it doesn't need a visual report designer. You can very quickly create reports and produce documents that can be displayed, printed or exported into many popular formats such as PDF, Excel, Word and others.

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/**
 * DynamicReports - Free Java reporting library for creating reports dynamically
 *
 * Copyright (C) 2010 - 2016 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 .
 */

package net.sf.dynamicreports.report.builder.subtotal;

import net.sf.dynamicreports.report.base.DRVariable;
import net.sf.dynamicreports.report.builder.FieldBuilder;
import net.sf.dynamicreports.report.builder.column.ColumnBuilder;
import net.sf.dynamicreports.report.builder.column.ValueColumnBuilder;
import net.sf.dynamicreports.report.builder.datatype.DataTypes;
import net.sf.dynamicreports.report.constant.Calculation;
import net.sf.dynamicreports.report.constant.Constants;
import net.sf.dynamicreports.report.constant.Evaluation;
import net.sf.dynamicreports.report.constant.SubtotalPosition;
import net.sf.dynamicreports.report.definition.DRIField;
import net.sf.dynamicreports.report.definition.DRIValue;
import net.sf.dynamicreports.report.definition.column.DRIValueColumn;
import net.sf.dynamicreports.report.definition.expression.DRIExpression;
import net.sf.dynamicreports.report.exception.DRReportException;

/**
 * @author Ricardo Mariaca ([email protected])
 */
public class AggregationSubtotalBuilder extends SubtotalBuilder, T> implements DRIValue {
	private static final long serialVersionUID = Constants.SERIAL_VERSION_UID;

	private DRIExpression expression;
	private Calculation calculation;

	//column
	protected AggregationSubtotalBuilder(ValueColumnBuilder column, Calculation calculation) {
		this(column.getColumn(), column, calculation);
	}

	//field
	protected AggregationSubtotalBuilder(FieldBuilder field, ColumnBuilder showInColumn, Calculation calculation) {
		this(field.build(), showInColumn, calculation);
	}

	//expression
	protected AggregationSubtotalBuilder(DRIExpression expression, ColumnBuilder showInColumn, Calculation calculation) {
		super(showInColumn);
		this.expression = expression;
		this.calculation = calculation;
		if (calculation.equals(Calculation.COUNT) || calculation.equals(Calculation.DISTINCT_COUNT)) {
			setDataType(DataTypes.longType());
		}
		else if (calculation.equals(Calculation.AVERAGE) || calculation.equals(Calculation.STANDARD_DEVIATION) ||
				calculation.equals(Calculation.VARIANCE)) {
			setDataType(DataTypes.doubleType());
		}
		else if (expression instanceof DRIValueColumn){
			setDataType(((DRIValueColumn) expression).getComponent().getDataType());
			setPattern(((DRIValueColumn) expression).getComponent().getPattern());
		}
		else if (expression instanceof DRIField){
			setDataType(((DRIField) expression).getDataType());
		}
	}

	@Override
	protected void configure() {
		DRVariable subtotalVariable = new DRVariable(expression, calculation);
		Evaluation resetType = subtotalPositionToEvaluation(getObject().getPosition());
		subtotalVariable.setResetType(resetType);
		subtotalVariable.setResetGroup(getObject().getGroup());
		setValueExpression(subtotalVariable);

		super.configure();
	}

	private static Evaluation subtotalPositionToEvaluation(SubtotalPosition position) {
		switch (position) {
		case PAGE_HEADER:
		case PAGE_FOOTER:
			return Evaluation.PAGE;
		case COLUMN_HEADER:
		case COLUMN_FOOTER:
			return Evaluation.COLUMN;
		case GROUP_HEADER:
		case GROUP_FOOTER:
			return Evaluation.GROUP;
		case FIRST_GROUP_HEADER:
		case FIRST_GROUP_FOOTER:
			return Evaluation.FIRST_GROUP;
		case LAST_GROUP_HEADER:
		case LAST_GROUP_FOOTER:
			return Evaluation.LAST_GROUP;
		case TITLE:
		case LAST_PAGE_FOOTER:
		case SUMMARY:
			return Evaluation.REPORT;
		default:
			throw new DRReportException("Subtotal position " + position.name() + " not supported");
		}
	}

	@Override
	public String getName() {
		return getSubtotal().getName();
	}
}