Java 类javax.xml.crypto.dom.DOMURIReference 实例源码

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

        if (uriReference == null) {
            throw new NullPointerException("Parameter 'uriReference' cannot be null.");
        }

        if (context == null) {
            throw new NullPointerException("Parameter 'context' can notbe null.");
        }

        if (!(uriReference instanceof DOMURIReference && context instanceof DOMCryptoContext)) {
            throw new IllegalArgumentException(String.format("This %s implementation supports the DOM XML mechanism only.",
                    URIDereferencer.class.getName()));
        }

        String uriString = uriReference.getURI();

        if (uriString == null) {
            throw new URIReferenceException("Cannot resolve a URI of value 'null'.");
        }

        if (uriString != null && ((uriString.length() != 0 && uriString.charAt(0) == '#') || uriString.isEmpty())) {
            // same document uri
            XMLSignatureFactory fac = XMLSignatureFactory.getInstance("DOM");
            return fac.getURIDereferencer().dereference(uriReference, context);
        }

        throw new URIReferenceException(String.format("URI reference %s not supported", uriString));
    }