Creating reports and dashboards | Stimulsoft community forum

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public StiReport render(StiReport report) throws IOException, StiException {
           report.getCustomFunctions().add(new StiCustomFunction() {
            public Object invoke(List<Object> args) {
                return ((String) args.get(0)).substring(((Long) args.get(1)).intValue(), ((Long) args.get(2)).intValue());
            }

            @SuppressWarnings({ "rawtypes", "unchecked" })
            public List<Class> getParametersList() {
                return new ArrayList<Class>(Arrays.asList(String.class, Long.class, Long.class));
            }

            public String getFunctionName() {
                return "subStr";
            }
        });
        return super.render(report);
    }