@Override
public boolean persistItem(Item item, boolean overwrite) throws PersistenceException {
// Caveat - this method uses the *provided* uuid as an indicator of file location. This
// abstracts the item contents from the target storage indicator which could be an overhead,
// but it allows the system to persist vanilla items (non-qualified items) as well as fully
// qualified.
//
// Also for sake of simplicity the persister just uses String objects from the aspects - the
// non-String
// objects are discarded **BAD UTH**
//
// For fully qualified items simply call the item name utils to get the uuid and use that as
// the provided parameter to the object.
// First check parameters have been setup correctly
if (_uuid == null && _targetDirectory == null) {
throw new PersistenceException("Persister not initialised (missing parameters).");
}
// Prepare the target file
String filename = this.getTargetLocation();
// If overwrite then remove the file if it exists
if (overwrite) {
@SuppressWarnings("unused")
boolean success = this.removeItem(item);
} else {
if (this.itemExists(item)) {
throw new PersistenceException("Overwrite disabled and item is already persisted.");
}
}
// Debatable behaviour model - open file now, write aspects as extracted
try {
PrintWriter out = new PrintWriter(new FileOutputStream(filename));
// Manually map the created date as a separate field
out.print("CREATED:::" + Long.toString(item.getCreationUTC()) + "\n");
// Manually store the comparitors for re-constituting the item
List<String> comparitors = item.getComparitors();
StringBuffer compBuffer = null;
for (String comparitor : comparitors) {
if (compBuffer == null) {
compBuffer = new StringBuffer("COMPARITORS:::" + comparitor);
} else {
compBuffer.append("," + comparitor);
}
}
out.print(compBuffer.toString() + "\n");
// Now split the aspects and discard the non-java.util.String ones (for now, **BAD UTH**)
Map<String, Object> contents = item.getContents();
for (String key : contents.keySet()) {
Object value = contents.get(key);
if (value.getClass().getCanonicalName().equals("java.lang.String")) {
String payload = (String) value;
// Convert the data to store-able
String output = key + ":::" + payload + "\n";
out.print(output);
}
}
out.close();
} catch (Exception exc) {
throw new PersistenceException("File output failure due to " + exc.toString());
}
return false;
}
