Java Solutions: DynamicReports in java (5)

The subreport function allows multiple reports to be included into one report one after another.

public class SubreportTest {
private StyleBuilder bold;
private StyleBuilder centeredBold;
private StyleBuilder columnTitleStyle;
private StyleBuilder columnStyle;

private JasperReportBuilder reportBuilder;

public SubreportTest() {
bold = Styles.style().bold();
centeredBold = Styles.style(bold)
.setHorizontalAlignment(HorizontalAlignment.CENTER);
columnTitleStyle = Styles.style(centeredBold)
.setBackgroundColor(Color.LIGHT_GRAY)
.setBorder(Styles.pen1Point());
columnStyle = Styles.style()
.setHorizontalAlignment(HorizontalAlignment.LEFT)
.setLeftIndent(4)
.setBottomPadding(5);

build();
}

public void build() {
//Creating the subreport
SubreportExpression subreportExpress = new SubreportExpression();
SubreportBuilder subreport = Components.subreport(subreportExpress);
  subreport.setDataSource(new SubreportDataSourceExpression());
reportBuilder = DynamicReports.report();

//Formatting the subreports
//Using default page break and setting the gap between subreports to 20
reportBuilder.detail(subreport, Components.verticalGap(20));
//Beginning each subreport on a new page
//reportBuilder.detail(subreport, Components.pageBreak());
//Only having a page break at a subreport
//reportBuilder.detail(subreport, Components.pageBreak().setPrintWhenExpression(new PageBreakExpression()));
//No page break
//reportBuilder.ignorePagination();

//Setting the page header (the title to be displayed on top of each page)
reportBuilder.pageHeader(Components.text("Comprehensive Report").setStyle(centeredBold));
reportBuilder.pageHeader(Components.text("Statistics of Market Development").setStyle(centeredBold));
reportBuilder.pageHeader(Components.horizontalList(Components.text("Date: " + new Date().toString()),
Components.filler().setFixedWidth(420),
Components.text("Pay Attention Please")));

//Setting the page footer
reportBuilder.pageFooter(Components.horizontalFlowList().add(Components.text("Page "))
.add(Components.pageNumber())
.setStyle(bold));

//Setting the number of subreports
reportBuilder.setDataSource(new JREmptyDataSource(2));

reportBuilder.show();
reportBuilder.toPdf(new FileOutputStream(new File(<fileName>)));
}

private class SubreportExpression extends AbstractSimpleExpression<JasperReportBuilder> {
public JasperReportBuilder evaluate(ReportParameters reportParameters) {
int masterRowNumber = reportParameters.getReportRowNumber();

JasperReportBuilder report = DynamicReports.report();
//DynamicReports subreport row starts from 1 instead of 0
  if (masterRowNumber == 1){
report.columns(Columns.column("Col 1", "col1Data", DataTypes.stringType()),
Columns.column("Col 2", "col2Data", DataTypes.stringType()));
report.setColumnTitleStyle(columnTitleStyle.setBottomBorder(Styles.penDashed()));
report.setColumnStyle(columnStyle);
report.highlightDetailEvenRows();
} else if (masterRowNumber == 2){
report.columns(Columns.column("Column 1", "col3Data", DataTypes.stringType()),
Columns.column("Column 2", "col4Data", DataTypes.stringType()));
report.setColumnTitleStyle(columnTitleStyle.setBottomBorder(Styles.penDashed()));
report.setColumnStyle(columnStyle);
report.highlightDetailEvenRows();
}
}
return report;
}

private class SubreportDataSourceExpression extends AbstractSimpleExpression<JRDataSource> {
//private ArrayList<DRDataSource> dataSourceArray;

//public SubreportDataSourceExpression(ArrayList<DRDataSource> dataSourceArray){
// super();
// this.dataSourceArray = dataSourceArray;
//}

public JRDataSource evaluate(ReportParameters reportParameters) {
int masterRowNumber = reportParameters.getReportRowNumber();
DRDataSource dataSource;
if (masterRowNumber == 1) {
dataSource = new DRDataSource("col1Data", "col2Data");
dataSource.add("Apple", "Sweet Fruit");
dataSource.add("Lemon", "Sour Fruit");
} else if (masterRowNumber == 2) {
dataSource = new DRDataSource("col3Data", "col4Data");
dataSource.add("Diamond", "Transparent");
dataSource.add("Ruby", "Red");
}
return dataSource;
// return dataSourceArray.get(masterRowNumber-1);
}
}

private class PageBreakExpression extends AbstractSimpleExpression<Boolean> {
public Boolean evaluate(ReportParameters reportParameters) {
//Only having a page break after the first subreport
if (reportParameters.getReportRowNumber() == 1) {
return true;
} else {
return false;
}
}
}
}

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