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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.DRGroup;
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.builder.expression.PercentageExpression;
import net.sf.dynamicreports.report.builder.group.GroupBuilder;
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.PercentageTotalType;
import net.sf.dynamicreports.report.definition.expression.DRIExpression;
import net.sf.dynamicreports.report.exception.DRReportException;

/**
 * @author Ricardo Mariaca ([email protected])
 */
public class PercentageSubtotalBuilder extends BaseSubtotalBuilder {
	private static final long serialVersionUID = Constants.SERIAL_VERSION_UID;

	private DRIExpression expression;
	private PercentageTotalType totalType;
	private DRGroup totalGroup;

	//column
	protected PercentageSubtotalBuilder(ValueColumnBuilder column) {
		this(column.build(), column);
	}

	//field
	protected PercentageSubtotalBuilder(FieldBuilder field, ColumnBuilder showInColumn) {
		this(field.getField(), showInColumn);
	}

	//expression
	protected PercentageSubtotalBuilder(DRIExpression expression, ColumnBuilder showInColumn) {
		super(showInColumn);
		this.expression = expression;
	}

	public PercentageSubtotalBuilder setTotalType(PercentageTotalType totalType) {
		this.totalType = totalType;
		return this;
	}

	public PercentageSubtotalBuilder setTotalGroup(GroupBuilder totalGroup) {
		if (totalGroup != null) {
			this.totalGroup = totalGroup.getGroup();
			setTotalType(PercentageTotalType.GROUP);
		}
		else {
			this.totalGroup = null;
		}
		return this;
	}

	@Override
	protected void configure() {
		if (getObject().getValueField().getDataType() == null) {
			getObject().getValueField().setDataType(DataTypes.percentageType());
		}

		DRVariable actualExpression = new DRVariable(expression, Calculation.SUM);
		actualExpression.setResetType(Evaluation.GROUP);
		actualExpression.setResetGroup(getObject().getGroup());

		DRVariable totalExpression = new DRVariable(expression, Calculation.SUM);
		if (totalType != null) {
			switch (totalType) {
			case REPORT:
				totalExpression.setResetType(Evaluation.REPORT);
				break;
			case GROUP:
				totalExpression.setResetType(Evaluation.GROUP);
				break;
			case FIRST_GROUP:
				totalExpression.setResetType(Evaluation.FIRST_GROUP);
				break;
			case LAST_GROUP:
				totalExpression.setResetType(Evaluation.LAST_GROUP);
				break;
			default:
				throw new DRReportException("Percentage total type " + totalType.name() + " not supported.");
			}
		}
		else {
			totalExpression.setResetType(Evaluation.BEFORE_GROUP);
			totalGroup = getObject().getGroup();
		}
		totalExpression.setResetGroup(totalGroup);

		setValueExpression(new PercentageExpression(actualExpression, totalExpression));

		super.configure();
	}
}