/**
* Converts the XML to Tree * is used to represent an empty string # is used for an empty list
* These escape charectors will get removed from the file and will not effect the content of the
* Tree.
*
* @param node
* @return
*/
private static Tree xmlToTree(Node node) {
NodeList nl = node.getChildNodes();
Node firstChild = nl.item(0);
if (nl.getLength() > 0 && firstChild instanceof Text) {
String text = ((Text) firstChild).getWholeText();
if (text.charAt(0) == STRING_ESCAPE) {
return new Tree(text.substring(1));
} else if (text.charAt(0) == TREE_ESCAPE) {
return new Tree();
} else {
return new Tree(text);
}
}
Tree t = new Tree();
for (int i = 0; i < nl.getLength(); i++)
t.add(new Tree.Entry(nl.item(i).getNodeName(), xmlToTree(nl.item(i))));
return t;
}
/**
* Change a tree to a XML document. * is used to represent an empty string # is used for an empty
* list These escape charactors will get added to the XML file and when reading gets taken out.
* They will not have any effects on the contents of the XML file.
*
* @param tree
* @param doc
* @param node
*/
private static void treeToDOC(Tree tree, Document doc, Node node) {
if (tree.isLeaf()) {
String value = tree.value();
if (value.length() == 0
|| value.charAt(0) == STRING_ESCAPE
|| value.charAt(0) == TREE_ESCAPE) {
value = STRING_ESCAPE + value;
}
node.appendChild(doc.createTextNode(value));
} else {
if (tree.size() > 0) {
for (Tree.Entry t : tree.children()) {
Node n = doc.createElement(t.name());
treeToDOC(t.tree(), doc, n);
node.appendChild(n);
}
} else {
node.appendChild(doc.createTextNode("" + TREE_ESCAPE));
}
}
}
/**
* A helper method which calls tree.fromString(str).
*
* @param str
* @return
* @throws ParseException
*/
public Tree treeFromString(String str) throws ParseException {
return Tree.fromString(str);
}
/**
* A helper method which calls tree.toString()
*
* @param tree
* @return tree.toString()
*/
public static String treeToString(Tree tree) {
return tree.toString();
}
