node == null
*/
public static Element getFirstChildElement(Node node) {
Node child = node.getFirstChild();
while (child != null && child.getNodeType() != Node.ELEMENT_NODE) {
child = child.getNextSibling();
}
return (Element) child;
}
/**
* Returns the last child element of the specified node, or null if there
* is no such element.
*
* @param node the node
* @return the last child element of the specified node, or null if there
* is no such element
* @throws NullPointerException if node == null
*/
public static Element getLastChildElement(Node node) {
Node child = node.getLastChild();
while (child != null && child.getNodeType() != Node.ELEMENT_NODE) {
child = child.getPreviousSibling();
}
return (Element) child;
}
/**
* Returns the next sibling element of the specified node, or null if there
* is no such element.
*
* @param node the node
* @return the next sibling element of the specified node, or null if there
* is no such element
* @throws NullPointerException if node == null
*/
public static Element getNextSiblingElement(Node node) {
Node sibling = node.getNextSibling();
while (sibling != null && sibling.getNodeType() != Node.ELEMENT_NODE) {
sibling = sibling.getNextSibling();
}
return (Element) sibling;
}
/**
* Returns the attribute value for the attribute with the specified name.
* Returns null if there is no such attribute, or
* the empty string if the attribute value is empty.
*
* This works around a limitation of the DOM
* Element.getAttributeNode method, which does not distinguish
* between an unspecified attribute and an attribute with a value of
* "" (it returns "" for both cases).
*
* @param elem the element containing the attribute
* @param name the name of the attribute
* @return the attribute value (may be null if unspecified)
*/
public static String getAttributeValue(Element elem, String name) {
Attr attr = elem.getAttributeNodeNS(null, name);
return (attr == null) ? null : attr.getValue();
}
/**
* Returns a Set of Nodes, backed by the specified
* NodeList.
*
* @param nl the NodeList
* @return a Set of Nodes
*/
public static Set nodeSet(NodeList nl) {
return new NodeSet(nl);
}
static class NodeSet extends AbstractSet {
private NodeList nl;
public NodeSet(NodeList nl) {
this.nl = nl;
}
public int size() { return nl.getLength(); }
public Iterator iterator() {
return new Iterator() {
int index = 0;
public void remove() {
throw new UnsupportedOperationException();
}
public Object next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
return nl.item(index++);
}
public boolean hasNext() {
return index < nl.getLength() ? true : false;
}
};
}
}
/**
* Returns the prefix associated with the specified namespace URI
*
* @param context contains the namespace map
* @param nsURI the namespace URI
* @return the prefix associated with the specified namespace URI, or
* null if not set
*/
public static String getNSPrefix(XMLCryptoContext context, String nsURI) {
if (context != null) {
return context.getNamespacePrefix
(nsURI, context.getDefaultNamespacePrefix());
} else {
return null;
}
}
/**
* Returns the prefix associated with the XML Signature namespace URI
*
* @param context contains the namespace map
* @return the prefix associated with the specified namespace URI, or
* null if not set
*/
public static String getSignaturePrefix(XMLCryptoContext context) {
return getNSPrefix(context, XMLSignature.XMLNS);
}
/**
* Removes all children nodes from the specified node.
*
* @param node the parent node whose children are to be removed
*/
public static void removeAllChildren(Node node) {
NodeList children = node.getChildNodes();
for (int i = 0, length = children.getLength(); i < length; i++) {
node.removeChild(children.item(i));
}
}
/**
* Compares 2 nodes for equality. Implementation is not complete.
*/
public static boolean nodesEqual(Node thisNode, Node otherNode) {
if (thisNode == otherNode) {
return true;
}
if (thisNode.getNodeType() != otherNode.getNodeType()) {
return false;
}
// FIXME - test content, etc
return true;
}
/**
* Checks if child element has same owner document before
* appending to the parent, and imports it to the parent's document
* if necessary.
*/
public static void appendChild(Node parent, Node child) {
Document ownerDoc = getOwnerDocument(parent);
if (child.getOwnerDocument() != ownerDoc) {
parent.appendChild(ownerDoc.importNode(child, true));
} else {
parent.appendChild(child);
}
}
public static boolean paramsEqual(AlgorithmParameterSpec spec1,
AlgorithmParameterSpec spec2) {
if (spec1 == spec2) {
return true;
}
if (spec1 instanceof XPathFilter2ParameterSpec &&
spec2 instanceof XPathFilter2ParameterSpec) {
return paramsEqual((XPathFilter2ParameterSpec) spec1,
(XPathFilter2ParameterSpec) spec2);
}
if (spec1 instanceof ExcC14NParameterSpec &&
spec2 instanceof ExcC14NParameterSpec) {
return paramsEqual((ExcC14NParameterSpec) spec1,
(ExcC14NParameterSpec) spec2);
}
if (spec1 instanceof XPathFilterParameterSpec &&
spec2 instanceof XPathFilterParameterSpec) {
return paramsEqual((XPathFilterParameterSpec) spec1,
(XPathFilterParameterSpec) spec2);
}
if (spec1 instanceof XSLTTransformParameterSpec &&
spec2 instanceof XSLTTransformParameterSpec) {
return paramsEqual((XSLTTransformParameterSpec) spec1,
(XSLTTransformParameterSpec) spec2);
}
return false;
}
private static boolean paramsEqual(XPathFilter2ParameterSpec spec1,
XPathFilter2ParameterSpec spec2) {
List types = spec1.getXPathList();
List otypes = spec2.getXPathList();
int size = types.size();
if (size != otypes.size()) {
return false;
}
for (int i = 0; i < size; i++) {
XPathType type = (XPathType) types.get(i);
XPathType otype = (XPathType) otypes.get(i);
if (!type.getExpression().equals(otype.getExpression()) ||
!type.getNamespaceMap().equals(otype.getNamespaceMap()) ||
type.getFilter() != otype.getFilter()) {
return false;
}
}
return true;
}
private static boolean paramsEqual(ExcC14NParameterSpec spec1,
ExcC14NParameterSpec spec2) {
return spec1.getPrefixList().equals(spec2.getPrefixList());
}
private static boolean paramsEqual(XPathFilterParameterSpec spec1,
XPathFilterParameterSpec spec2) {
return (spec1.getXPath().equals(spec2.getXPath()) &&
spec1.getNamespaceMap().equals(spec2.getNamespaceMap()));
}
private static boolean paramsEqual(XSLTTransformParameterSpec spec1,
XSLTTransformParameterSpec spec2) {
XMLStructure ostylesheet = spec2.getStylesheet();
if (!(ostylesheet instanceof javax.xml.crypto.dom.DOMStructure)) {
return false;
}
Node ostylesheetElem =
((javax.xml.crypto.dom.DOMStructure) ostylesheet).getNode();
XMLStructure stylesheet = spec1.getStylesheet();
Node stylesheetElem =
((javax.xml.crypto.dom.DOMStructure) stylesheet).getNode();
return nodesEqual(stylesheetElem, ostylesheetElem);
}
}