/**
* Retuns the subject locators of the topic.
*
* @param topic The topic.
* @return A (maybe empty) array of subject locators.
*/
private String[] _getSubjectLocators(final Topic topic) {
final Locator[] slos = topic.getSubjectLocators().toArray(new Locator[0]);
final String[] sloArray = new String[slos.length];
for (int i = 0; i < slos.length; i++) {
sloArray[i] = slos[i].toExternalForm();
}
return sloArray;
}
/**
* Returns the subject identifiers of the topic.
*
* @param topic The topic.
* @return A (maybe empty) sorted array of IRIs.
*/
private String[] _getSubjectIdentifiers(final Topic topic) {
final Locator[] sids = topic.getSubjectIdentifiers().toArray(new Locator[0]);
final String[] sidArray = new String[sids.length];
for (int i = 0; i < sids.length; i++) {
sidArray[i] = sids[i].toExternalForm();
}
Arrays.sort(sidArray);
return sidArray;
}
/**
* Returns topic references to the types of the topic.
*
* @param topic The topic.
* @return A (maybe empty) sorted array of topic references.
*/
private String[] _getTypes(final Topic topic) {
final Topic[] types = topic.getTypes().toArray(new Topic[0]);
final String[] typeArray = new String[types.length];
for (int i = 0; i < types.length; i++) {
typeArray[i] = _getTopicReference(types[i]);
}
Arrays.sort(typeArray);
return typeArray;
}
/**
* Generates the prefixes for the specified topic (incl. its played roles and occurrences and
* names).
*
* @param topic The topic to generate the prefixes for.
*/
private void _registerPrefixes(final Topic topic) {
_generateTopicReferences(topic.getTypes());
for (Occurrence occ : topic.getOccurrences()) {
_generatePrefixes(occ);
}
for (Name name : topic.getNames()) {
_generatePrefixes(name);
for (Variant variant : name.getVariants()) {
_generatePrefixes(variant);
}
}
for (Role rolePlayed : topic.getRolesPlayed()) {
Association assoc = rolePlayed.getParent();
_generatePrefixes(assoc);
for (Role role : assoc.getRoles()) {
_getTopicReference(role.getType());
}
}
}
/**
* Main entry point for writing TM/XML.
*
* <p>This method generates the prefixes and writes TM/XML.
*
* @param topics The topics to write.
* @param topicMap The topic map to which all topics belong to or <tt>null</tt>.
* @throws IOException In case of an error.
*/
private void _write(final Iterable<Topic> topics, final TopicMap topicMap) throws IOException {
_registerPrefixes(topics);
_startTopicMap(topicMap);
final Iterator<Topic> iter = topics.iterator();
if (iter.hasNext()) {
final Topic topic = iter.next();
final TopicMap tm = topic.getTopicMap();
// Assuming that the locator can be used for all topics even if
// they originate from different topic maps.
_defaultNameTypeLocator = tm.createLocator(TMDM.TOPIC_NAME);
_writeTopic(topic);
while (iter.hasNext()) {
_writeTopic(iter.next());
}
}
_endTopicMap();
_prefix2IRI.clear();
_iri2Prefix.clear();
_topic2Reference.clear();
_exportedAssocIds.clear();
}
/**
* Returns an item identifier fragment from the topic iff the topic has an item identifier which
* starts with the base locator.
*
* @return The topic id or {@code null} if no item identifier was found.
*/
private String _getTopicIdentifier(final Topic topic) {
String id = null;
for (Locator loc : topic.getItemIdentifiers()) {
String reference = loc.getReference();
if (!reference.startsWith(_baseIRI)) {
continue;
}
int fragIdx = reference.indexOf('#');
if (fragIdx < 0) {
continue;
}
id = reference.substring(fragIdx + 1);
if (id != null && isValidNCName(id)) {
break;
}
id = null;
}
return id;
}
/**
* Writes the specified topic.
*
* @param topic The topic to serialize.
* @throws IOException In case of an error.
*/
private void _writeTopic(final Topic topic) throws IOException {
final String[] types = _getTypes(topic);
final String[] sids = _getSubjectIdentifiers(topic);
final String[] slos = _getSubjectLocators(topic);
if (topic.getSubjectIdentifiers().contains(_defaultNameTypeLocator)
&& sids.length == 1
&& slos.length == 0
&& topic.getRolesPlayed().isEmpty()
&& topic.getOccurrences().isEmpty()
&& topic.getNames().isEmpty()
&& types.length == 0) {
return;
}
final String element = types.length > 0 ? types[0] : _UNTYPED_TOPIC;
// Only add id iff no sids and slos are available
if (sids.length == 0 && slos.length == 0) {
_attrs.clear();
super.addAttribute("id", super.getId(topic));
_out.startElement(element, _attrs);
} else {
final String id = _getTopicIdentifier(topic);
if (id != null) {
_attrs.clear();
super.addAttribute("id", id);
_out.startElement(element, _attrs);
} else {
_out.startElement(element);
}
}
for (String sid : sids) {
_out.dataElement(_EL_SID, sid);
}
for (String slo : slos) {
_out.dataElement(_EL_SLO, slo);
}
for (Name name : topic.getNames()) {
_writeName(name);
}
for (Occurrence occ : topic.getOccurrences()) {
_writeOccurrence(occ);
}
// Type-instance relationships
for (int i = 1; i < types.length; i++) {
_attrs.clear();
super.addAttribute("role", _INSTANCE);
super.addAttribute("otherrole", _TYPE);
super.addAttribute("topicref", types[i]);
_out.emptyElement(_TYPE_INSTANCE, _attrs);
}
for (Role playedRole : topic.getRolesPlayed()) {
final Association assoc = playedRole.getParent();
if (_exportedAssocIds.contains(assoc.getId())
|| super.isTypeInstanceAssociation(assoc, assoc.getRoles())) {
continue;
}
_exportedAssocIds.add(assoc.getId());
_attrs.clear();
_addScopeAndReifier(assoc);
_addToAttributes("role", playedRole.getType());
final String assocElement = _type(assoc);
final int arity = assoc.getRoles().size();
if (arity == 1) {
_out.emptyElement(assocElement, _attrs);
} else if (arity == 2) {
for (Role role : assoc.getRoles()) {
if (!role.equals(playedRole)) {
_addToAttributes("topicref", role.getPlayer());
_addToAttributes("otherrole", role.getType());
}
}
_out.emptyElement(assocElement, _attrs);
} else {
// n-ary association
_out.startElement(assocElement, _attrs);
for (Role role : assoc.getRoles()) {
if (role.equals(playedRole)) {
continue;
}
_attrs.clear();
_addToAttributes("topicref", role.getPlayer());
_out.emptyElement(_type(role), _attrs);
}
_out.endElement(assocElement);
}
}
_out.endElement(element);
}