Subreport order sorting - sorting

Question

In my report there are currently 2 subreports, let's call them A and B.
The A lists Cash positions, and the B lists Stocks.
I run this report from a web based Java environment, the JasperReports's report reads from a sql database.
I want to pass an argument to the JR report that tells it in what order to arrange the subreports, in this case for e.g. (B first, then A or vice versa).
Is there a way to accomplish this?

Answer 1

You should send a parameter of boolean type. while generating report. on the basis of that parameter you should define the path of subreport.
Here is jrxml code for subrepor path.e.g.
For first subreport:
<subreport>
<reportElement uuid="8dba7f58-0466-4504-9d51-7484786450d2" positionType="Float" x="0" y="16" width="315" height="16"/>
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{listOfObject})]]></dataSourceExpression>
<subreportExpression><![CDATA[$P{swap} == true ? "/path/to/first/subreport" : /path/to/second/subreport]]></subreportExpression>
</subreport>
And for second subreport:
<subreport>
<reportElement uuid="8dba7f58-0466-4504-9d51-7484786450d2" positionType="Float" x="0" y="16" width="315" height="16"/>
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{listOfObject})]]></dataSourceExpression>
<subreportExpression><![CDATA[$P{swap} == true ? "/path/to/second/subreport" : /path/to/first/subreport]]></subreportExpression>
</subreport>
And vice-versa in other case.I have not tested. Please have a look.
Enjoy.

Answer 2

You could use a more complex subreportExpression and "Print When Expression".
In first subreport set print when to something like
$P{NUM_OF_SUBS} <= 1 ? true : false
in second
$P{NUM_OF_SUBS} <= 2 ? true : false
etc...
And for subreportExpression in first subreport something like:
$P{SUBS}.split(",")[1] == "A"
? "repo:subA.jrxml"
: $P{SUBS}.split(",")[1] == "B"
? "repo:subB.jrxml"
: $P{SUBS}.split(",")[1] == "C"
? "repo:subC.jrxml"
: "repo:subD.jrxml"
and in second:
$P{SUBS}.split(",")[2] == "A"
? "repo:subA.jrxml"
: $P{SUBS}.split(",")[2] == "B"
? "repo:subB.jrxml"
: $P{SUBS}.split(",")[2] == "C"
? "repo:subC.jrxml"
: "repo:subD.jrxml"
etc...