/**
* merges content from xmlDocument2 into xmlDocument1 (xmlDocument2 will overwrite nodes from
* xmlDocument1)
*
* @param xmlDocument1
* @param xmlDocument2
* @return
*/
public static Document mergeXmlDocuments(Document xmlDocument1, Document xmlDocument2) {
if (xmlDocument1 == null) {
return xmlDocument2;
} else if (xmlDocument2 == null) {
return xmlDocument1;
}
Element root1 = xmlDocument1.getRootElement();
Element root2 = xmlDocument2.getRootElement();
if (!root1.getName().equals(root2.getName())) {
// we can't merge files with different root nodes
return xmlDocument1;
}
// List<Element> children = root2.getChildren();
List<Element> children = new ArrayList(root2.getChildren());
if (children.size() > 0) {
for (Element child : children) {
// Element childCopy = (Element) child.clone();
mergeXmlElement(child, root1, true);
}
}
return root1.getDocument();
// return new Document(root1); // we need to detach root1 first if we want to return a new
// Document
}
/**
* merge element into parent Simulates the Varien_Simplexml_Element::extendChild method
*
* @param element
* @param parent
* @param overwrite if true it will delete the original "element" from parent and use the new one
* (only if the original has no children)
* @return
*/
public static Element mergeXmlElement(Element element, Element parent, boolean overwrite) {
if (element == null || parent == null) {
return parent;
}
// detach parent
// element = (Element)element.clone();
element.detach();
String sourceName = element.getName();
// List<Element> sourceChildren = element.getChildren();
// we need to create a new static list for avoiding a ConcurrentModificationException in the for
// loop below
List<Element> sourceChildren = new ArrayList(element.getChildren()); // static list
// Iterator itr = (currentElement.getChildren()).iterator();
// while(itr.hasNext()) {
// Element oneLevelDeep = (Element)itr.next();
// List twoLevelsDeep = oneLevelDeep.getChildren();
// // Do something with these children
// }
Element original = parent.getChild(sourceName);
// if element has no children
if (sourceChildren.size() == 0) {
if (original != null) {
// if target already has children return without regard
if (original.getChildren().size() > 0) {
return parent;
}
// new element has no children, original exists without children too, and we are asking for
// an overwrite
if (overwrite) {
// remove it only here (the new one is added later)
parent.removeChild(sourceName);
} else {
return parent;
}
}
parent.addContent(element);
} else {
if (original == null) {
parent.addContent(element);
} else {
// we need to merge children
for (Element child : sourceChildren) {
Element newParent = original;
mergeXmlElement(child, newParent, overwrite);
}
}
}
return parent;
}