private Object convertToCollection()

in plugins/json/src/main/java/org/apache/struts2/json/JSONPopulator.java [182:244]
54 lines of code
16 McCabe index (conditional complexity)

    private Object convertToCollection(Class clazz, Type type, Object value, Method accessor)
            throws JSONException, IllegalArgumentException, IllegalAccessException,
            InvocationTargetException, InstantiationException, NoSuchMethodException, IntrospectionException {
        if (value == null)
            return null;
        else if (value instanceof List) {
            Class itemClass = Object.class;
            Type itemType = null;
            if ((type != null) && (type instanceof ParameterizedType)) {
                ParameterizedType ptype = (ParameterizedType) type;
                itemType = ptype.getActualTypeArguments()[0];
                if (itemType.getClass().equals(Class.class)) {
                    itemClass = (Class) itemType;
                } else {
                    itemClass = (Class) ((ParameterizedType) itemType).getRawType();
                }
            }
            List values = (List) value;

            Collection newCollection = null;
            try {
                newCollection = (Collection) clazz.newInstance();
            } catch (InstantiationException ex) {
                // fallback if clazz represents an interface or abstract class
                if (SortedSet.class.isAssignableFrom(clazz)) {
                    newCollection = new TreeSet();
                } else if (Set.class.isAssignableFrom(clazz)) {
                    newCollection = new HashSet();
                } else if (Queue.class.isAssignableFrom(clazz)) {
                    newCollection = new ArrayDeque();
                } else {
                    newCollection = new ArrayList();
                }
            }

            // create an object for each element
            for (Object listValue : values) {

                if (itemClass.equals(Object.class)) {
                    // Object[]
                    newCollection.add(listValue);
                } else if (isJSONPrimitive(itemClass)) {
                    // primitive array
                    newCollection.add(this.convertPrimitive(itemClass, listValue, accessor));
                } else if (Map.class.isAssignableFrom(itemClass)) {
                    Object newObject = convertToMap(itemClass, itemType, listValue, accessor);
                    newCollection.add(newObject);
                } else if (List.class.isAssignableFrom(itemClass)) {
                    Object newObject = convertToCollection(itemClass, itemType, listValue, accessor);
                    newCollection.add(newObject);
                } else if (listValue instanceof Map) {
                    // array of beans
                    Object newObject = itemClass.newInstance();
                    this.populateObject(newObject, (Map) listValue);
                    newCollection.add(newObject);
                } else
                    throw new JSONException("Incompatible types for property " + accessor.getName());
            }

            return newCollection;
        } else
            throw new JSONException("Incompatible types for property " + accessor.getName());
    }