/**
* Returns the value of an attribute for an element.
*
* @param element the element to check
* @param definition the definition of the attribute to retrieve from the element
* @return the defined attribute value, or <tt>null</tt> if the attribute was not found on the
* element
*/
public static String getAttribute(Element element, XmlNode definition) {
if (element == null) {
return null;
}
if (definition.isNamespaceAware()) {
if (element.hasAttributeNS(definition.getNamespace(), definition.getLocalName())) {
return element.getAttributeNS(definition.getNamespace(), definition.getLocalName());
}
} else {
if (element.hasAttribute(definition.getLocalName())) {
return element.getAttribute(definition.getLocalName());
}
}
return null;
}
/**
* Returns a sibling element that matches a given definition, or <tt>null</tt> if no match is
* found.
*
* @param sibling the sibling DOM element to begin the search
* @param target the node to search for
* @return the matching element, or <tt>null</tt> if not found
*/
public static Element findSibling(Element sibling, XmlNode target) {
String xmlName = target.getLocalName();
String xmlNamespace = target.getNamespace();
Node node = sibling;
if (node == null) {
return null;
}
while ((node = node.getNextSibling()) != null) {
if (node.getNodeType() != Node.ELEMENT_NODE) {
continue;
}
Element element = (Element) node;
if (!element.getLocalName().equals(xmlName)) {
continue;
}
if (target.isNamespaceAware()) {
String ns = element.getNamespaceURI();
if (ns == null) {
if (xmlNamespace != null) {
continue;
}
} else {
if (!ns.equals(xmlNamespace)) {
continue;
}
}
}
return element;
}
return null;
}
/**
* Finds the Nth matching child of a DOM element.
*
* @param parent the parent DOM node
* @param target the node to search for
* @param offset the occurrence of the matching node
* @return the matching element, or <tt>null</tt> if no match is found
*/
public static Element findChild(Node parent, XmlNode target, int offset) {
Node node = parent;
if (node != null) {
node = node.getFirstChild();
}
if (node == null) {
return null;
}
String xmlName = target.getLocalName();
String xmlNamespace = target.getNamespace();
int count = 0;
do {
if (node.getNodeType() != Node.ELEMENT_NODE) {
continue;
}
Element element = (Element) node;
if (!element.getLocalName().equals(xmlName)) {
continue;
}
if (target.isNamespaceAware()) {
String ns = element.getNamespaceURI();
if (ns == null) {
if (xmlNamespace != null && xmlNamespace.length() != 0) {
continue;
}
} else {
if (!ns.equals(xmlNamespace)) {
continue;
}
}
}
if (count == offset) {
return element;
}
++count;
} while ((node = node.getNextSibling()) != null);
return null;
}