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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.chart;

import java.io.Serializable;
import java.util.Comparator;
import java.util.List;

import net.sf.dynamicreports.design.transformation.chartcustomizer.GroupedStackedBarRendererCustomizer;
import net.sf.dynamicreports.report.constant.Constants;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;

/**
 * @author Ricardo Mariaca ([email protected])
 */
public class SeriesOrderByNamesComparator implements Comparator, Serializable {
	private static final long serialVersionUID = Constants.SERIAL_VERSION_UID;

	private List seriesNames;

	public SeriesOrderByNamesComparator(List seriesNames) {
		Validate.notNull(seriesNames, "seriesNames must not be null");
		Validate.noNullElements(seriesNames, "seriesNames must not contains null seriesName");
		this.seriesNames = seriesNames;
	}

	@Override
	public int compare(String o1, String o2) {
		String row1;
		String row2;
		if (StringUtils.countMatches(o1, GroupedStackedBarRendererCustomizer.GROUP_SERIES_KEY) == 1 &&
				StringUtils.countMatches(o2, GroupedStackedBarRendererCustomizer.GROUP_SERIES_KEY) == 1) {
			String group1 = StringUtils.substringBefore(o1, GroupedStackedBarRendererCustomizer.GROUP_SERIES_KEY);
			String group2 = StringUtils.substringBefore(o2, GroupedStackedBarRendererCustomizer.GROUP_SERIES_KEY);
			int compare = group1.compareTo(group2);
			if (compare != 0) {
				return compare;
			}
			row1 = StringUtils.substringAfter(o1, GroupedStackedBarRendererCustomizer.GROUP_SERIES_KEY);
			row2 = StringUtils.substringAfter(o2, GroupedStackedBarRendererCustomizer.GROUP_SERIES_KEY);
		}
		else {
			row1 = o1;
			row2 = o2;
		}
		int index1 = seriesNames.indexOf(row1);
		int index2 = seriesNames.indexOf(row2);
		if (index1 < 0 && index2 < 0) {
			return row1.compareTo(row2);
		}
		if (index1 == index2) {
			return 0;
		}
		if (index1 < 0) {
			return index1 * -1;
		}
		if (index2 < 0) {
			return index2;
		}
		return index1 - index2;
	}
}