protected static String choosePrefix()

in src/main/java/org/apache/servicemix/jbi/jaxp/XMLStreamHelper.java [234:280]
36 lines of code
13 McCabe index (conditional complexity)

    protected static String choosePrefix(XMLStreamWriter out, QName name, boolean declare) throws XMLStreamException {
        String uri = name.getNamespaceURI();
        // If no namespace
        if (uri == null || XMLConstants.NULL_NS_URI.equals(uri)) {
            if (!XMLConstants.NULL_NS_URI.equals(out.getNamespaceContext().getNamespaceURI(XMLConstants.DEFAULT_NS_PREFIX))) {
                out.setPrefix(XMLConstants.DEFAULT_NS_PREFIX, XMLConstants.NULL_NS_URI);
            }
            return XMLConstants.DEFAULT_NS_PREFIX;
            // Need to write a prefix
        } else {
            String defPrefix = name.getPrefix();
            // A prefix is specified
            if (defPrefix != null && !XMLConstants.DEFAULT_NS_PREFIX.equals(defPrefix)) {
                // if the uri is bound to the specified prefix, good, else
                if (!uri.equals(out.getNamespaceContext().getNamespaceURI(defPrefix))) {
                    // if there is a prefix bound to the uri, use it
                    if (out.getNamespaceContext().getPrefix(uri) != null) {
                        defPrefix = out.getNamespaceContext().getPrefix(uri);
                        // get prefix from the writer
                    } else if (out.getPrefix(uri) != null) {
                        defPrefix = out.getPrefix(uri);
                        // we need to bind the prefix
                    } else if (declare) {
                        out.setPrefix(defPrefix, uri);
                        out.writeNamespace(defPrefix, uri);
                    }
                }
                // No prefix specified
            } else {
                // if there is a prefix bound to the uri, use it
                if (out.getNamespaceContext().getPrefix(uri) != null) {
                    defPrefix = out.getNamespaceContext().getPrefix(uri);
                    // get prefix from the writer
                } else if (out.getPrefix(uri) != null) {
                    defPrefix = out.getPrefix(uri);
                    // we need to generate a prefix
                } else {
                    defPrefix = getUniquePrefix(out);
                    if (declare) {
                        out.setPrefix(defPrefix, uri);
                        out.writeNamespace(defPrefix, uri);
                    }
                }
            }
            return defPrefix;
        }
    }