public static OMNamespace handleNamespace()

in mixins/om-mixins/src/main/java/org/apache/axiom/om/impl/common/NSUtil.java [29:73]
42 lines of code
23 McCabe index (conditional complexity)

    public static OMNamespace handleNamespace(
            AxiomElement context, OMNamespace ns, boolean attr, boolean decl) {
        String namespaceURI = ns == null ? "" : ns.getNamespaceURI();
        String prefix = ns == null ? "" : ns.getPrefix();
        if (namespaceURI.length() == 0) {
            if (prefix != null && prefix.length() != 0) {
                throw new IllegalArgumentException(
                        "Cannot bind a prefix to the empty namespace name");
            }
            if (!attr && decl) {
                // Special case: no namespace; we need to generate a namespace declaration only if
                // there is a conflicting namespace declaration (i.e. a declaration for the default
                // namespace with a non empty URI) is in scope
                if (context.getDefaultNamespace() != null) {
                    context.declareDefaultNamespace("");
                }
            }
            return null;
        } else {
            if (attr && prefix != null && prefix.length() == 0) {
                throw new IllegalArgumentException(
                        "An attribute with a namespace must be prefixed");
            }
            boolean addNSDecl = false;
            if (context != null && (decl || prefix == null)) {
                OMNamespace existingNSDecl = context.findNamespace(namespaceURI, prefix);
                if (existingNSDecl == null
                        || (prefix != null && !existingNSDecl.getPrefix().equals(prefix))
                        || (prefix == null && attr && existingNSDecl.getPrefix().length() == 0)) {
                    addNSDecl = decl;
                } else {
                    prefix = existingNSDecl.getPrefix();
                    ns = existingNSDecl;
                }
            }
            if (prefix == null) {
                prefix = generatePrefix(namespaceURI);
                ns = new OMNamespaceImpl(namespaceURI, prefix);
            }
            if (addNSDecl) {
                context.addNamespaceDeclaration(ns);
            }
            return ns;
        }
    }