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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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/*
 * DynamicJasper: 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.core.DJException;
import ar.com.fdvs.dj.domain.DJChart;
import ar.com.fdvs.dj.domain.entities.columns.AbstractColumn;
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;
import net.sf.jasperreports.engine.type.ResetTypeEnum;

import java.util.Iterator;
import java.util.List;

public class DataSetFactory {

	public static JRDesignChartDataset getDataset(DJChart djchart, JRDesignGroup group, JRDesignGroup parentGroup, List vars){

		JRDesignChartDataset dataSet = null;
		
		byte chartType = djchart.getType();
		
		if (chartType == DJChart.PIE_CHART){
			dataSet = createPieDataset(group,parentGroup, vars, djchart);
		}
		else if (chartType == DJChart.BAR_CHART) {
			dataSet = createBarDataset(group,parentGroup, vars, djchart);
		}
//		else if (chartType ==  DJChart.LINE_CHART) {
//			dataSet = createLineDataset(group,parentGroup, vars, djchart);
//		}

		if (dataSet == null){
			throw new DJException("Error creating dataset for chart, no valid dataset type.");
		}

		return dataSet;
	}

	/**
	 * Use vars[0] as value, user vars[1] as series
	 * @param group
	 * @param parentGroup
	 * @param vars
	 * @param djchart
	 * @return
	 */
	protected static JRDesignChartDataset createLineDataset(JRDesignGroup group, JRDesignGroup parentGroup, List vars, DJChart djchart) {
		JRDesignCategoryDataset data = new JRDesignCategoryDataset(null);

//		for (Iterator iterator = vars.iterator(); iterator.hasNext();) {
			JRDesignCategorySeries serie = new JRDesignCategorySeries();
//			JRDesignVariable var = (JRDesignVariable) iterator.next();
			JRDesignVariable var = (JRDesignVariable) vars.get(0);
			JRDesignVariable var1 = (JRDesignVariable) vars.get(0);
			if (vars.size() > 1)
				var1 = (JRDesignVariable) vars.get(1);
			
			//And use it as value for each bar
			JRDesignExpression varExp = getExpressionFromVariable(var);
			JRExpression varExp1 = var1.getExpression();
			serie.setValueExpression(varExp);
	
			//The key for each bar
			JRExpression exp2 = group.getExpression();
	
			JRDesignExpression exp3 = new JRDesignExpression();
			int index = vars.indexOf(var);
			AbstractColumn col = (AbstractColumn) djchart.getColumns().get(index);
			exp3.setText("\"" + col.getTitle() + "\"");
			exp3.setValueClass(String.class);
	
			//Here you can set subgroups of bars
			serie.setCategoryExpression(exp2);
//			serie.setCategoryExpression(varExp1);
	
			serie.setLabelExpression(exp2);
			serie.setSeriesExpression(varExp1);
				
			data.addCategorySeries(serie);
//		}

		setResetStyle(data, group, parentGroup);
		return data;
	}

	protected static JRDesignChartDataset createBarDataset(JRDesignGroup group, JRDesignGroup parentGroup, List vars, DJChart djchart) {
		JRDesignCategoryDataset data = new JRDesignCategoryDataset(null);

		for (Iterator iterator = vars.iterator(); iterator.hasNext();) {
			JRDesignCategorySeries serie = new JRDesignCategorySeries();
			JRDesignVariable var = (JRDesignVariable) iterator.next();
			
			//And use it as value for each bar
			JRDesignExpression varExp = getExpressionFromVariable(var);
			serie.setValueExpression(varExp);
	
			//The key for each bar
			JRExpression exp2 = group.getExpression();
	
			JRDesignExpression exp3 = new JRDesignExpression();
			int index = vars.indexOf(var);
			AbstractColumn col = (AbstractColumn) djchart.getColumns().get(index);
			exp3.setText("\"" + col.getTitle() + "\"");
			exp3.setValueClass(String.class);
	
			//Here you can set subgroups of bars
			if (!djchart.getOptions().isUseColumnsAsCategorie()){
				serie.setCategoryExpression(exp3);
				
				serie.setLabelExpression(exp2);
				serie.setSeriesExpression(exp2);
			} else {
				//FIXED: due to https://sourceforge.net/forum/message.php?msg_id=7396861
				serie.setCategoryExpression(exp2);
				
				serie.setLabelExpression(exp3);
				serie.setSeriesExpression(exp3);
			}

				
			data.addCategorySeries(serie);
		}

		setResetStyle(data, group, parentGroup);

		return data;
	}

	protected static JRDesignChartDataset createPieDataset(JRDesignGroup group, JRDesignGroup parentGroup, List vars, DJChart djchart) {		
		JRDesignPieDataset data = new JRDesignPieDataset(null);

		for (Iterator iterator = vars.iterator(); iterator.hasNext();) {
			JRDesignVariable var = (JRDesignVariable) iterator.next();
			
			//And transform it in the value for each pie slice
			JRDesignExpression expression = getExpressionFromVariable(var);
			data.setValueExpression(expression);

			break; //PIE data set uses only one series
		}
		//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 JRDesignExpression 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( ResetTypeEnum.REPORT );
		else
			dataset.setResetType( ResetTypeEnum.GROUP );
	}
}