/**
* This method is called when the start of an XML element is encountered. Instantiates new objects
* when necessary and lets the characters method know what kind of action to take.
*
* @param name Name of the element that is encountered.
* @param atts The attributes encountered.
* @throws SAXException Exception thrown if is wrong type of XML file.
*/
public void startElement(String namespace, String name, String qName, Attributes atts)
throws SAXException {
// Make sure is correct file type
if (count == 0)
if (!name.equals("feature_vector_file") && !qName.equals("feature_vector_file"))
throw new SAXException("\n\nIt is in reality of the type " + name + ".");
count++;
// Identify the type of tag
tag_identifier = 0;
if (name.equals("data_set") || qName.equals("data_set")) {
// Create a new Dataset and add it to root_datasets.
current_root_dataset = new DataSet();
root_datasets.add(current_root_dataset);
} else if (name.equals("section") || qName.equals("section")) {
// Create a new set of sub-sets of a data set if subset_datasets is null
if (subset_datasets == null) subset_datasets = new LinkedList<DataSet>();
// Create a new sub-set DataSet. Place this DataSet in the list of
// sub-set DataSets and gives it a reference to it's parent root
// DataSet.
current_subset_dataset = new DataSet();
current_subset_dataset.parent = current_root_dataset;
subset_datasets.add(current_subset_dataset);
// Extract the name of the DataSet from the id attribute
current_subset_dataset.start = Double.parseDouble(atts.getValue(0));
current_subset_dataset.stop = Double.parseDouble(atts.getValue(1));
} else if (name.equals("feature") || qName.equals("feature")) {
// Prepare the linked lists to store feature values
if (feature_name_list == null) {
feature_name_list = new LinkedList<String>();
feature_values_list = new LinkedList<double[]>();
}
feature_indidual_values_list = new LinkedList<String>();
} else if (name.equals("data_set_id") || qName.equals("data_set_id")) tag_identifier = 1;
else if (name.equals("name") || qName.equals("name")) tag_identifier = 2;
else if (name.equals("v") || qName.equals("v")) tag_identifier = 3;
}
/**
* This method is called when the end tag of an XML element is encountered.
*
* @param name Name of the element that is encountered.
*/
public void endElement(String namespace, String name, String qName) {
if (name.equals("data_set") || qName.equals("data_set")) {
// Store feature_name_list and feature_values_list in
// current_root_dataset
if (feature_name_list != null) {
Object[] fnl_obj = (Object[]) feature_name_list.toArray();
String[] fnl_string = new String[fnl_obj.length];
for (int i = 0; i < fnl_string.length; i++) fnl_string[i] = (String) fnl_obj[i];
current_root_dataset.feature_names = fnl_string;
Object[] fvl_obj = (Object[]) feature_values_list.toArray();
double[][] fvl_doub = new double[fvl_obj.length][];
for (int i = 0; i < fvl_doub.length; i++) fvl_doub[i] = (double[]) fvl_obj[i];
current_root_dataset.feature_values = fvl_doub;
}
// Store the sub-sets of the data set (null if none)
if (subset_datasets != null) {
Object[] dsl_obj = (Object[]) subset_datasets.toArray();
DataSet[] dsl_ds = new DataSet[dsl_obj.length];
for (int i = 0; i < dsl_ds.length; i++) dsl_ds[i] = (DataSet) dsl_obj[i];
current_root_dataset.sub_sets = dsl_ds;
}
// Reset variables
feature_name_list = null;
feature_values_list = null;
subset_datasets = null;
current_root_dataset = null;
} else if (name.equals("section") || qName.equals("section")) {
// Store feature_name_list and feature_values_list in
// current_subset_dataset
if (feature_name_list != null) {
Object[] fnl_obj = (Object[]) feature_name_list.toArray();
String[] fnl_string = new String[fnl_obj.length];
for (int i = 0; i < fnl_string.length; i++) fnl_string[i] = (String) fnl_obj[i];
current_subset_dataset.feature_names = fnl_string;
Object[] fvl_obj = (Object[]) feature_values_list.toArray();
double[][] fvl_doub = new double[fvl_obj.length][];
for (int i = 0; i < fvl_doub.length; i++) fvl_doub[i] = (double[]) fvl_obj[i];
current_subset_dataset.feature_values = fvl_doub;
}
// Reset variables
feature_name_list = null;
feature_values_list = null;
current_subset_dataset = null;
} else if (name.equals("feature") || qName.equals("feature")) {
// Convert the feature_indidual_values_list into doubles
// and store it in feature_values_list
Object[] fvs_obj = (Object[]) feature_indidual_values_list.toArray();
double[] fvs_double = new double[fvs_obj.length];
for (int i = 0; i < fvs_double.length; i++)
fvs_double[i] = Double.parseDouble((String) fvs_obj[i]);
// Reset variables
feature_values_list.add(fvs_double);
feature_indidual_values_list = null;
}
}
/**
* This method responds to the contents of tags in a way determined by the name of the tag (as
* determined by the startElement method).
*/
public void characters(char[] ch, int start, int length) {
String contents = new String(ch, start, length);
if (tag_identifier == 1) current_root_dataset.identifier = contents;
else if (tag_identifier == 2) feature_name_list.add(contents);
else if (tag_identifier == 3) feature_indidual_values_list.add(contents);
}