/**
* Convert the given object into a value appropriate for being defined as the value of a variable
* in an XQuery. This will extract a sequence out of all database objects, convert collections and
* arrays into sequences recursively, convert <code>null</code> into an empty sequence, and pass
* other objects through untouched. Convertible objects that are defined in the JDK will be
* automatically converted by eXist.
*
* @see org.exist.xquery.XPathUtil#javaObjectToXPath(Object, XQueryContext, boolean)
* @param o the object to convert to a database value
* @return the converted value, ready for assignment to an XQuery variable
*/
@SuppressWarnings("unchecked")
private Object convertValue(Object o) {
if (o == null) return Collections.emptyList();
if (o instanceof Resource) {
try {
return ((Resource) o).convertToSequence();
} catch (UnsupportedOperationException e) {
return o;
}
}
List<Object> list = null;
if (o instanceof Collection) list = new ArrayList<Object>((Collection) o);
else if (o instanceof Object[]) list = new ArrayList<Object>(Arrays.asList((Object[]) o));
if (list != null) {
for (ListIterator<Object> it = list.listIterator(); it.hasNext(); ) {
it.set(convertValue(it.next()));
}
return list;
}
return DataUtils.toXMLObject(o);
}
