public void parseDataFormatXMLfile(URL url) throws MaltChainedException {
if (url == null) {
throw new DataFormatException("The data format specifcation file cannot be found. ");
}
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Element root = db.parse(url.openStream()).getDocumentElement();
if (root.getNodeName().equals("dataformat")) {
dataFormatName = root.getAttribute("name");
if (root.getAttribute("datastructure").length() > 0) {
dataStructure = DataStructure.valueOf(root.getAttribute("datastructure").toUpperCase());
} else {
dataStructure = DataStructure.DEPENDENCY;
}
} else {
throw new DataFormatException(
"Data format specification file must contain one 'dataformat' element. ");
}
NodeList cols = root.getElementsByTagName("column");
Element col;
for (int i = 0, n = cols.getLength(); i < n; i++) {
col = (Element) cols.item(i);
DataFormatEntry entry =
new DataFormatEntry(
col.getAttribute("name"),
col.getAttribute("category"),
col.getAttribute("type"),
col.getAttribute("default"));
entries.put(entry.getDataFormatEntryName(), entry);
}
NodeList deps = root.getElementsByTagName("dependencies");
if (deps.getLength() > 0) {
NodeList dep = ((Element) deps.item(0)).getElementsByTagName("dependency");
for (int i = 0, n = dep.getLength(); i < n; i++) {
Element e = (Element) dep.item(i);
dependencies.add(
new Dependency(
e.getAttribute("name"),
e.getAttribute("url"),
e.getAttribute("map"),
e.getAttribute("urlmap")));
}
}
} catch (java.io.IOException e) {
throw new DataFormatException("Cannot find the file " + url.toString() + ". ", e);
} catch (ParserConfigurationException e) {
throw new DataFormatException("Problem parsing the file " + url.toString() + ". ", e);
} catch (SAXException e) {
throw new DataFormatException("Problem parsing the file " + url.toString() + ". ", e);
}
}
public static void main(String[] args) throws IOException, ClassNotFoundException {
// Create a simple object graph
DataStructure ds = new DataStructure();
ds.message = "hello world";
ds.data = new int[] {1, 2, 3, 4};
ds.other = new DataStructure();
ds.other.message = "nested structure";
ds.other.data = new int[] {9, 8, 7};
// Display the original object graph
System.out.println("Original data structure: " + ds);
// Output it to a file
File f = new File("datastructure.ser");
System.out.println("Storing to a file...");
Serializer.store(ds, f);
// Read it back from the file, and display it again
ds = (DataStructure) Serializer.load(f);
System.out.println("Read from the file: " + ds);
// Create a deep clone and display that. After making the copy
// modify the original to prove that the clone is "deep".
DataStructure ds2 = (DataStructure) Serializer.deepclone(ds);
ds.other.message = null;
ds.other.data = null; // Change original
System.out.println("Deep clone: " + ds2);
}
public String toString() {
String s = message;
for (int i = 0; i < data.length; i++) s += " " + data[i];
if (other != null) s += "\n\t" + other.toString();
return s;
}