DynamicReports: Column Subreport - create subreport in a column of the parent report

Following is a sample code of creating a subreport that includes the name and price in the parent column Objects.

import static net.sf.dynamicreports.report.builder.DynamicReports.*;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import net.sf.dynamicreports.examples.Templates;
import net.sf.dynamicreports.jasper.builder.JasperReportBuilder;
import net.sf.dynamicreports.report.base.expression.AbstractSimpleExpression;
import net.sf.dynamicreports.report.builder.DynamicReports;
import net.sf.dynamicreports.report.builder.component.SubreportBuilder;
import net.sf.dynamicreports.report.builder.style.Styles;
import net.sf.dynamicreports.report.constant.HorizontalAlignment;
import net.sf.dynamicreports.report.definition.ReportParameters;
import net.sf.dynamicreports.report.exception.DRException;
import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.data.JRMapCollectionDataSource;

public class ColumnSubreportTest {

    public ColumnSubreportTest() {
        SubreportBuilder subreport = cmp.subreport(new SubreportDesign())
                .setDataSource(new SubreportData());
     
        JasperReportBuilder report = DynamicReports.report();
        try {
            report.fields(field("objects", List.class))
                    .columns(
                            col.column("Category", "category", type.stringType()),
                            col.column("Health Index", "healthIndex", type.integerType()),
                            col.componentColumn("Objects", subreport)
                            .setFixedWidth(240)
                            .setStyle(Styles.style()
                                    .setBottomPadding(15))
                            .setTitleStyle(Styles.style()
                                    .bold().setHorizontalAlignment(HorizontalAlignment.LEFT)));
            report.setColumnTitleStyle(Styles.style().bold()
                    .setHorizontalAlignment(HorizontalAlignment.LEFT));
            report.setColumnStyle(Styles.style()
                    .setHorizontalAlignment(HorizontalAlignment.LEFT));
            report.title(cmp.text("List of real food")
                    .setStyle(Styles.style().bold().setFontSize(14)
                            .setHorizontalAlignment(HorizontalAlignment.CENTER)
                            .setBottomPadding(20)))
                    .pageFooter(Templates.footerComponent);

            report.setDataSource(createDataSource());
            report.show();
        } catch (DRException e) {
            e.printStackTrace();
        }
   }

   private class SubreportDesign extends AbstractSimpleExpression<JasperReportBuilder> {
      private static final long serialVersionUID = 1L;

      @Override
      public JasperReportBuilder evaluate(ReportParameters reportParameters) {
         JasperReportBuilder report = report()
            .columns(col.column("name", type.stringType()),
                    col.column("price", type.stringType()));
         return report;
      }
   }

   private class SubreportData extends AbstractSimpleExpression<JRDataSource> {

      @Override
      public JRDataSource evaluate(ReportParameters reportParameters) {
         Collection<Map<String, ?>> value = reportParameters.getValue("objects");
         return new JRMapCollectionDataSource(value);
      }
   }

  private JRDataSource createDataSource() {
   ArrayList<ReportData> datasource = new ArrayList<ReportData>();

   ReportData data = new ReportData();
   data.setCategory("Fruit");
   data.setHealthIndex(95);
 
   List<Map<String, Object>> objects = new ArrayList<Map<String, Object>>();
   Map<String, Object> values = new HashMap<String, Object>();
   values.put("name", "Apple");
   values.put("price", "$1.65/lb");
   objects.add(values);
   values = new HashMap<String, Object>();
   values.put("name", "Papaya");
   values.put("price", "$1.98/lb");
   objects.add(values);
   data.setObjects(objects);
 
   datasource.add(data);
 
   data = new ReportData();
   data.setCategory("Rice");
   data.setHealthIndex(70);
 
   objects = new ArrayList<Map<String, Object>>();
   values = new HashMap<String, Object>();
   values.put("name", "Brown Rice");
   values.put("price", "$0.35/lb");
   objects.add(values);
   values = new HashMap<String, Object>();
   values.put("name", "White Rice");
   values.put("price", "$0.15/lb");
   objects.add(values);
   data.setObjects(objects);
 
   datasource.add(data);

      return new JRBeanCollectionDataSource(datasource);
   }

   //It is important to let this inner class to be public
   public class ReportData {
      private String category;
      private Integer hi;
      private List<Map<String, Object>> objects;

      public String getCategory() {
         return category;
      }

      public void setCategory(String c) {
         category = c;
      }

      public Integer getHealthIndex() {
         return hi;
      }

      public void setHealthIndex(Integer i) {
         hi = i;
      }

      public List<Map<String, Object>> getObjects() {
         return objects;
      }

      public void setObjects(List<Map<String, Object>> o) {
         objects = o;
      }
   }

   public static void main(String[] args) {
      new ColumnSubreportTest();
   }
}

                             > Next
       
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References:

1. Row Subreport - create subreport in a row of the parent report
2. DynamicReports Page subreport - create subreport in a page of the parent report and set report/subreport/component border