public void begin()

in rt/databinding/jaxb/src/main/java/org/apache/cxf/jaxb/JAXBContextInitializer.java [86:187]
92 lines of code
35 McCabe index (conditional complexity)

    public void begin(MessagePartInfo part) {
        Class<?> clazz = part.getTypeClass();
        if (clazz == null) {
            return;
        }

        if (Exception.class.isAssignableFrom(clazz)) {
            //exceptions are handled special, make sure we mark it
            part.setProperty(JAXBDataBinding.class.getName() + ".CUSTOM_EXCEPTION",
                             Boolean.TRUE);
        }
        boolean isFromWrapper = part.getMessageInfo().getOperation().isUnwrapped();
        if (isFromWrapper
            && !Boolean.TRUE.equals(part.getProperty("messagepart.isheader"))) {
            UnwrappedOperationInfo uop = (UnwrappedOperationInfo)part.getMessageInfo().getOperation();
            OperationInfo op = uop.getWrappedOperation();
            MessageInfo inf = null;
            if (uop.getInput() == part.getMessageInfo()) {
                inf = op.getInput();
            } else if (uop.getOutput() == part.getMessageInfo()) {
                inf = op.getOutput();
            }
            if (inf != null
                && inf.getFirstMessagePart().getTypeClass() != null) {
                //if the wrapper has a type class, we don't need to do anything
                //as everything would have been discovered when walking the
                //wrapper type (unless it's a header which wouldn't be in the wrapper)
                return;
            }
        }
        if (isFromWrapper
            && clazz.isArray()
            && !Byte.TYPE.equals(clazz.getComponentType())) {
            clazz = clazz.getComponentType();
        }

        Annotation[] a = (Annotation[])part.getProperty("parameter.annotations");
        checkForAdapter(clazz, a);

        Type genericType = (Type) part.getProperty("generic.type");
        if (genericType != null) {
            boolean isList = Collection.class.isAssignableFrom(clazz);
            if (isFromWrapper) {
                if (genericType instanceof Class
                    && ((Class<?>)genericType).isArray()) {
                    Class<?> cl2 = (Class<?>)genericType;
                    if (cl2.isArray()
                        && !Byte.TYPE.equals(cl2.getComponentType())) {
                        genericType = cl2.getComponentType();
                    }
                    addType(genericType);
                } else if (!isList) {
                    addType(genericType);
                }
            } else {
                addType(genericType, true);
            }

            if (isList
                && genericType instanceof ParameterizedType) {
                ParameterizedType pt = (ParameterizedType) genericType;
                if (pt.getActualTypeArguments().length > 0
                    && pt.getActualTypeArguments()[0] instanceof Class) {

                    Class<? extends Object> arrayCls =
                        Array.newInstance((Class<?>) pt.getActualTypeArguments()[0], 0).getClass();
                    clazz = arrayCls;
                    part.setTypeClass(clazz);
                    if (isFromWrapper) {
                        addType(clazz.getComponentType(), true);
                    }
                } else if (pt.getActualTypeArguments().length > 0
                    && pt.getActualTypeArguments()[0] instanceof GenericArrayType) {
                    GenericArrayType gat = (GenericArrayType)pt.getActualTypeArguments()[0];
                    gat.getGenericComponentType();
                    Class<? extends Object> arrayCls =
                        Array.newInstance((Class<?>) gat.getGenericComponentType(), 0).getClass();
                    clazz = Array.newInstance(arrayCls, 0).getClass();
                    part.setTypeClass(clazz);
                    if (isFromWrapper) {
                        addType(clazz.getComponentType(), true);
                    }
                }
            }
            if (isFromWrapper && isList) {
                clazz = null;
            }
        }
        if (clazz != null) {
            if (!isFromWrapper
                && clazz.getAnnotation(XmlRootElement.class) == null
                && clazz.getAnnotation(XmlType.class) != null
                && StringUtils.isEmpty(clazz.getAnnotation(XmlType.class).name())) {
                Object ref = createTypeReference(part.getName(), clazz);
                if (ref != null) {
                    typeReferences.add(ref);
                }
            }

            addClass(clazz);
        }
    }