public void evaluateExtraParams()

in core/src/main/java/org/apache/struts2/components/ListUIBean.java [66:146]
67 lines of code
23 McCabe index (conditional complexity)

    public void evaluateExtraParams() {
        Object value;

        if (list == null) {
            list = attributes.get("list");
        }

        if (list instanceof String) {
            value = findValue((String) list);
            if (value == null) {
                if (throwExceptionOnNullValueAttribute) {
                    // will throw an exception if not found
                    value = findValue(list == null ? null : list.toString(), "list",
                            "The requested list key '" + list + "' could not be resolved as a collection/array/map/enumeration/iterator type. " +
                                    "Example: people or people.{name}");
                } else {
                    // ww-1010, allows value with null value to be compatible with ww
                    // 2.1.7 behaviour
                    value = findValue(list == null ? null : list.toString());
                }
            }
        } else {
            value = list;
        }

        if (value == null || value instanceof Iterable) {
            addParameter("list", value);
        } else if (MakeIterator.isIterable(value)) {
            addParameter("list", MakeIterator.convert(value));
        } else {
            addParameter("list", Collections.singletonList(value));
        }

        if (value instanceof Collection) {
            addParameter("listSize", ((Collection) value).size());
        } else if (value instanceof Map) {
            addParameter("listSize", ((Map) value).size());
        } else if (value != null && value.getClass().isArray()) {
            addParameter("listSize", Array.getLength(value));
        }

        if (listKey != null) {
            listKey = stripExpression(listKey);
            addParameter("listKey", listKey);
        } else if (value instanceof Map) {
            addParameter("listKey", "key");
        } else {
            addParameter("listKey", "top");
        }

        if (listValueKey != null) {
            listValueKey = stripExpression(listValueKey);
            addParameter("listValueKey", listValueKey);
        }

        if (listValue != null) {
            listValue = stripExpression(listValue);
            addParameter("listValue", listValue);
        } else if (value instanceof Map) {
            addParameter("listValue", "value");
        } else {
            addParameter("listValue", "top");
        }

        if (listLabelKey != null) {
            listLabelKey = stripExpression(listLabelKey);
            addParameter("listLabelKey", listLabelKey);
        }

        if (StringUtils.isNotBlank(listCssClass)) {
            addParameter("listCssClass", listCssClass);
        }

        if (StringUtils.isNotBlank(listCssStyle)) {
            addParameter("listCssStyle", listCssStyle);
        }

        if (StringUtils.isNotBlank(listTitle)) {
            addParameter("listTitle", listTitle);
        }
    }