public DOMReference()

in src/main/java/org/apache/jcp/xml/dsig/internal/dom/DOMReference.java [211:293]
71 lines of code
14 McCabe index (conditional complexity)

    public DOMReference(Element refElem, XMLCryptoContext context,
                        Provider provider)
        throws MarshalException
    {
        boolean secVal = Utils.secureValidation(context);

        // unmarshal Transforms, if specified
        Element nextSibling = DOMUtils.getFirstChildElement(refElem);
        List<Transform> newTransforms = new ArrayList<>(MAXIMUM_TRANSFORM_COUNT);
        if ("Transforms".equals(nextSibling.getLocalName())
            && XMLSignature.XMLNS.equals(nextSibling.getNamespaceURI())) {
            Element transformElem = DOMUtils.getFirstChildElement(nextSibling,
                                                                  "Transform",
                                                                  XMLSignature.XMLNS);
            newTransforms.add(new DOMTransform(transformElem, context, provider));
            transformElem = DOMUtils.getNextSiblingElement(transformElem);
            while (transformElem != null) {
                String localName = transformElem.getLocalName();
                String namespace = transformElem.getNamespaceURI();
                if (!"Transform".equals(localName) || !XMLSignature.XMLNS.equals(namespace)) {
                    throw new MarshalException(
                        "Invalid element name: " + localName +
                        ", expected Transform");
                }
                newTransforms.add
                    (new DOMTransform(transformElem, context, provider));
                if (secVal && newTransforms.size() > MAXIMUM_TRANSFORM_COUNT) {
                    String error = "A maximum of " + MAXIMUM_TRANSFORM_COUNT + " "
                        + "transforms per Reference are allowed with secure validation";
                    throw new MarshalException(error);
                }
                transformElem = DOMUtils.getNextSiblingElement(transformElem);
            }
            nextSibling = DOMUtils.getNextSiblingElement(nextSibling);
        }
        if (!"DigestMethod".equals(nextSibling.getLocalName())
            && XMLSignature.XMLNS.equals(nextSibling.getNamespaceURI())) {
            throw new MarshalException("Invalid element name: " +
                                       nextSibling.getLocalName() +
                                       ", expected DigestMethod");
        }

        // unmarshal DigestMethod
        Element dmElem = nextSibling;
        this.digestMethod = DOMDigestMethod.unmarshal(dmElem);
        String digestMethodAlgorithm = this.digestMethod.getAlgorithm();
        if (secVal
            && MessageDigestAlgorithm.ALGO_ID_DIGEST_NOT_RECOMMENDED_MD5.equals(digestMethodAlgorithm)) {
            throw new MarshalException(
                "It is forbidden to use algorithm " + digestMethod + " when secure validation is enabled"
            );
        }

        // unmarshal DigestValue
        Element dvElem = DOMUtils.getNextSiblingElement(dmElem, "DigestValue", XMLSignature.XMLNS);
        String content = XMLUtils.getFullTextChildrenFromNode(dvElem);
        this.digestValue = XMLUtils.decode(content);

        // check for extra elements
        if (DOMUtils.getNextSiblingElement(dvElem) != null) {
            throw new MarshalException(
                "Unexpected element after DigestValue element");
        }

        // unmarshal attributes
        this.uri = DOMUtils.getAttributeValue(refElem, "URI");

        Attr attr = refElem.getAttributeNodeNS(null, "Id");
        if (attr != null) {
            this.id = attr.getValue();
            refElem.setIdAttributeNode(attr, true);
        } else {
            this.id = null;
        }

        this.type = DOMUtils.getAttributeValue(refElem, "Type");
        this.here = refElem.getAttributeNodeNS(null, "URI");
        this.refElem = refElem;
        this.transforms = newTransforms;
        this.allTransforms = transforms;
        this.appliedTransformData = null;
        this.provider = provider;
    }