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DynamicJasper (DJ) is an API that hides the complexity of Jasper Reports, it helps developers to save time when designing simple/medium complexity reports generating the layout of the report elements automatically. It creates reports dynamically, defining at runtime the columns, column width (auto width), groups, variables, fonts, charts, crosstabs, sub reports (that can also be dynamic), page size and everything else that you can define at design time. DJ keeps full compatibility with Jasper Reports since it's a tool that helps create reports programmatically in a easy way (it only interferes with the creation of the report design doing the layout of the elements). You can use the classic .jrxml files as templates while the content and layout of the report elements are handled by the DJ API. http://dynamicjasper.com

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/*
 * Dynamic Jasper: A library for creating reports dynamically by specifying
 * columns, groups, styles, etc. at runtime. It also saves a lot of development
 * time in many cases! (http://sourceforge.net/projects/dynamicjasper)
 *
 * Copyright (C) 2008  FDV Solutions (http://www.fdvsolutions.com)
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 *
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *
 */

package ar.com.fdvs.dj.domain.builders;

import ar.com.fdvs.dj.domain.DJChart;
import net.sf.jasperreports.charts.design.JRDesignCategoryDataset;
import net.sf.jasperreports.charts.design.JRDesignCategorySeries;
import net.sf.jasperreports.charts.design.JRDesignPieDataset;
import net.sf.jasperreports.engine.JRExpression;
import net.sf.jasperreports.engine.design.JRDesignChartDataset;
import net.sf.jasperreports.engine.design.JRDesignExpression;
import net.sf.jasperreports.engine.design.JRDesignGroup;
import net.sf.jasperreports.engine.design.JRDesignVariable;

public class DataSetFactory {

	public static JRDesignChartDataset getDataset(byte chartType, JRDesignGroup group, JRDesignGroup parentGroup, JRDesignVariable var){

		JRDesignChartDataset dataSet = null;

		if (chartType == DJChart.PIE_CHART){
			dataSet = createPieDataset(group,parentGroup, var);
		}
		else if (chartType == DJChart.BAR_CHART) {
			dataSet = createBarDataset(group,parentGroup, var);
		}

		//if (dataSet == null); //TODO: exception "Unknown chart type"

		return dataSet;
	}

	private static JRDesignChartDataset createBarDataset(JRDesignGroup group, JRDesignGroup parentGroup, JRDesignVariable var) {
		JRDesignCategoryDataset data = new JRDesignCategoryDataset(null);
		JRDesignCategorySeries serie = new JRDesignCategorySeries();

		//And use it as value for each bar
		serie.setValueExpression(getExpressionFromVariable(var));

		//The key for each bar
		JRExpression exp2 = group.getExpression();

		/*JRDesignExpression exp3 = new JRDesignExpression();
		exp3.setText("$F{productLine}");
		exp3.setValueClass(String.class);*/

		//Here you can set subgroups of bars
		//serie.setCategoryExpression(exp3);
		serie.setCategoryExpression(exp2);

		serie.setLabelExpression(exp2);
		serie.setSeriesExpression(exp2);

		data.addCategorySeries(serie);

		setResetStyle(data, group, parentGroup);

		return data;
	}

	private static JRDesignChartDataset createPieDataset(JRDesignGroup group, JRDesignGroup parentGroup, JRDesignVariable var) {
		JRDesignPieDataset data = new JRDesignPieDataset(null);

		//And transform it in the value for each pie slice
		data.setValueExpression(getExpressionFromVariable(var));

		//The key for each pie slice
		data.setKeyExpression(group.getExpression());

		setResetStyle(data, group, parentGroup);

		return data;
	}

	/**
	 * Generates an expression from a variable
	 * @param var The variable from which to generate the expression
	 * @return A expression that represents the given variable
	 */
	private static JRExpression getExpressionFromVariable(JRDesignVariable var){
		JRDesignExpression exp = new JRDesignExpression();
		exp.setText("$V{" + var.getName() + "}");
		exp.setValueClass(var.getValueClass());
		return exp;
	}

	private static void setResetStyle(JRDesignChartDataset dataset, JRDesignGroup group, JRDesignGroup parentGroup){
		//When to start a new chart? When the group's parent changes
		dataset.setResetGroup(parentGroup);
		if (dataset.getResetGroup().equals(group))
			dataset.setResetType(JRDesignVariable.RESET_TYPE_REPORT);
		else
			dataset.setResetType(JRDesignVariable.RESET_TYPE_GROUP);
	}
}