public int doStartTag()

in core/src/main/java/org/apache/struts2/views/jsp/iterator/SubsetIteratorTag.java [205:282]
66 lines of code
21 McCabe index (conditional complexity)

    public int doStartTag() throws JspException {

        // source
        Object source;
        if (sourceAttr == null || sourceAttr.isEmpty()) {
            source = findValue("top");
        } else {
            source = findValue(sourceAttr);
        }

        // count
        int count = -1;
        if (countAttr != null && !countAttr.isEmpty()) {
            Object countObj = findValue(countAttr);
            if (countObj instanceof Number) {
                count = ((Number)countObj).intValue();
            }
            else if (countObj instanceof String) {
                try {
                    count = Integer.parseInt((String)countObj);
                }
                catch(NumberFormatException e) {
                    LOG.warn("unable to convert count attribute [{}] to number, ignore count attribute", countObj, e);
                }
            }
        }

        // start
        int start = 0;
        if (startAttr != null && !startAttr.isEmpty()) {
            Object startObj = findValue(startAttr);
            if (startObj instanceof Integer) {
                start = (Integer) startObj;
            }
            else if (startObj instanceof Float) {
                start = ((Float)startObj).intValue();
            }
            else if (startObj instanceof Long) {
                start = ((Long)startObj).intValue();
            }
            else if (startObj instanceof Double) {
                start = ((Double)startObj).intValue();
            }
            else if (startObj instanceof String) {
                try {
                    start = Integer.parseInt((String)startObj);
                }
                catch(NumberFormatException e) {
                    LOG.warn("unable to convert count attribute [{}] to number, ignore count attribute", startObj, e);
                }
            }
        }

        // decider
        Decider decider = null;
        if (deciderAttr != null && !deciderAttr.isEmpty()) {
            Object deciderObj = findValue(deciderAttr);
            if (! (deciderObj instanceof Decider)) {
                throw new JspException("decider found from stack ["+deciderObj+"] does not implement "+Decider.class);
            }
            decider = (Decider) deciderObj;
        }


        subsetIteratorFilter = new SubsetIteratorFilter();
        subsetIteratorFilter.setCount(count);
        subsetIteratorFilter.setDecider(decider);
        subsetIteratorFilter.setSource(source);
        subsetIteratorFilter.setStart(start);
        subsetIteratorFilter.execute();

        getStack().push(subsetIteratorFilter);
        if (var != null && !var.isEmpty()) {
            pageContext.setAttribute(var, subsetIteratorFilter);
        }

        return EVAL_BODY_INCLUDE;
    }