public Data transform()

in src/main/java/org/apache/jcp/xml/dsig/internal/dom/ApacheCanonicalizer.java [196:259]
59 lines of code
12 McCabe index (conditional complexity)

    public Data transform(Data data, XMLCryptoContext xc, OutputStream os)
        throws TransformException
    {
        if (data == null) {
            throw new NullPointerException("data must not be null");
        }
        if (os == null) {
            throw new NullPointerException("output stream must not be null");
        }

        if (ownerDoc == null) {
            throw new TransformException("transform must be marshalled");
        }

        if (apacheTransform == null) {
            try {
                apacheTransform =
                    new Transform(ownerDoc, getAlgorithm(), transformElem.getChildNodes());
                apacheTransform.setElement(transformElem, xc.getBaseURI());
                LOG.log(Level.DEBUG, "Created transform for algorithm: {0}", getAlgorithm());
            } catch (Exception ex) {
                throw new TransformException
                    ("Couldn't find Transform for: " + getAlgorithm(), ex);
            }
        }

        XMLSignatureInput in;
        if (data instanceof ApacheData) {
            LOG.log(Level.DEBUG, "ApacheData = true");
            in = ((ApacheData)data).getXMLSignatureInput();
        } else if (data instanceof NodeSetData) {
            LOG.log(Level.DEBUG, "isNodeSet() = true");
            if (data instanceof DOMSubTreeData) {
                DOMSubTreeData subTree = (DOMSubTreeData)data;
                in = new XMLSignatureNodeInput(subTree.getRoot());
                in.setExcludeComments(subTree.excludeComments());
            } else {
                @SuppressWarnings({"unchecked", "rawtypes"})
                Set<Node> nodeSet = Utils.toNodeSet(((NodeSetData) data).iterator());
                in = new XMLSignatureNodeSetInput(nodeSet);
            }
        } else {
            LOG.log(Level.DEBUG, "isNodeSet() = false");
            try {
                in = new XMLSignatureStreamInput(((OctetStreamData) data).getOctetStream());
            } catch (Exception ex) {
                throw new TransformException(ex);
            }
        }

        boolean secVal = Utils.secureValidation(xc);
        in.setSecureValidation(secVal);

        try {
            in = apacheTransform.performTransform(in, os, secVal);
            if (in.hasUnprocessedInput()) {
                return new ApacheOctetStreamData(in);
            } else {
                return new ApacheNodeSetData(in);
            }
        } catch (Exception ex) {
            throw new TransformException(ex);
        }
    }