public Data dereference()

in src/main/java/org/apache/jcp/xml/dsig/internal/dom/DOMURIDereferencer.java [57:126]
60 lines of code
19 McCabe index (conditional complexity)

    public Data dereference(URIReference uriRef, XMLCryptoContext context)
        throws URIReferenceException {

        if (uriRef == null) {
            throw new NullPointerException("uriRef cannot be null");
        }
        if (context == null) {
            throw new NullPointerException("context cannot be null");
        }

        DOMURIReference domRef = (DOMURIReference) uriRef;
        Attr uriAttr = (Attr) domRef.getHere();
        String uri = uriRef.getURI();
        DOMCryptoContext dcc = (DOMCryptoContext) context;
        String baseURI = context.getBaseURI();

        boolean secVal = Utils.secureValidation(context);

        // Check if same-document URI and already registered on the context
        if (uri != null && uri.length() != 0 && uri.charAt(0) == '#') {
            String id = uri.substring(1);

            if (id.startsWith("xpointer(id(")) {
                int i1 = id.indexOf('\'');
                int i2 = id.indexOf('\'', i1+1);
                if (i1 >= 0 && i2 >= 0) {
                    id = id.substring(i1 + 1, i2);
                }
            }

            Node referencedElem = dcc.getElementById(id);
            if (referencedElem != null) {
                if (secVal) {
                    Element start = referencedElem.getOwnerDocument().getDocumentElement();
                    if (!XMLUtils.protectAgainstWrappingAttack(start, (Element)referencedElem, id)) {
                        String error = "Multiple Elements with the same ID " + id + " were detected";
                        throw new URIReferenceException(error);
                    }
                }

                XMLSignatureInput result = new XMLSignatureNodeInput(referencedElem);
                result.setSecureValidation(secVal);
                if (!uri.substring(1).startsWith("xpointer(id(")) {
                    result.setExcludeComments(true);
                }

                result.setMIMEType("text/xml");
                if (baseURI != null && baseURI.length() > 0) {
                    result.setSourceURI(baseURI.concat(uriAttr.getNodeValue()));
                } else {
                    result.setSourceURI(uriAttr.getNodeValue());
                }
                return new ApacheNodeSetData(result);
            }
        }

        ResourceResolverContext resContext = new ResourceResolverContext(uriAttr, baseURI, secVal);
        if ((uriRef instanceof javax.xml.crypto.dsig.Reference) || resContext.isURISafeToResolve()) {
            try {
                XMLSignatureInput in = ResourceResolver.resolve(resContext);
                if (in.hasUnprocessedInput()) {
                    return new ApacheOctetStreamData(in);
                }
                return new ApacheNodeSetData(in);
            } catch (Exception e) {
                throw new URIReferenceException(e);
            }
        }
        throw new URIReferenceException("URI " + uri + " is forbidden");
    }