question: public void endSubreport ( String subreport ) { if ( subreport . isEmpty ( ) ) { LOG . error ( String . format ( "Tried to end non-existing report \"%s\"" , subreport ) ) ; return ; } String topSubreport = subreports . peek ( ) ; if ( topSubreport . equals ( subreport ) ) { subreports . pop ( ) ; addLogEntry ( new SubreportEndEntry ( subreport ) ) ; return ; } LOG . error ( String . format ( "Tried to end non-existing report \"%s\"" , subreport ) ) ; }
target:  Closes the subreport. Checks if the provided subreport name matches subreport name stored on the stack. If the names match, endSubreport will remove the subreport from stack and close it. Otherwise, endSubreport will log an error in the report.