/**
* Builds a suffix net based on the given root node and writes it into a Neo4j-database (via given
* client).
*
* @param token Token of strings (will be nodes within the resulting net)
* @param rootnode Node/URI to start from
* @param graph Neo4J-REST-client
* @param createdNodes Map used to keep track of created nodes. If null, each call will create a
* different individual branch.
* @throws Exception
*/
private void buildSuffixNet(
String[] token,
KnotenUriTupel rootnode,
Neo4jRestKlient graph,
Map<String, KnotenUriTupel> createdNodes)
throws Exception {
// Keep track of created nodes
if (createdNodes == null) createdNodes = new HashMap<String, KnotenUriTupel>();
// Set parent node
Knoten parentNode = rootnode.getKnoten();
URI parentURI = rootnode.getUri();
// Check whether the root node exists within the graph or needs to be created
if (parentURI == null && graph != null) {
parentURI = graph.erstelleKnoten(parentNode.getName());
graph.etikettHinzufuegen(parentURI, "wurzel");
}
// Variable for child node
KnotenUriTupel child;
// Loop over the token array's elements
for (int i = 0; i < token.length; i++) {
// Check whether a node with the current token's name already exists
if (createdNodes.containsKey(token[i])) {
// If so, retrieve the node
child = createdNodes.get(token[i]);
// Check whether that node is already connected to the current parent node
if (!parentNode.getKinder().containsKey(token[i])) {
// If not, make the connection
parentNode.getKinder().put(token[i], child.getKnoten());
// Write new pairing to Neo4J DB
if (graph != null) {
graph.addRelationship(parentURI, child.getUri(), "child", "{ }");
graph.eigenschaftHinzufuegen(
child.getUri(), BERUEHRUNGSZAEHLER_SCHLUESSEL, child.getKnoten().getZaehler() + 1);
}
}
} else {
// Instantiate new node
child = new KnotenUriTupel();
child.setKnoten(new Knoten(token[i]));
// Connect it to parent
parentNode.getKinder().put(token[i], child.getKnoten());
// Put newly created token into DB
if (graph != null) {
child.setUri(graph.erstelleKnoten(child.getKnoten().getName()));
graph.addRelationship(parentURI, child.getUri(), "child", "{ }");
graph.eigenschaftHinzufuegen(child.getUri(), BERUEHRUNGSZAEHLER_SCHLUESSEL, 1);
}
// Remember it as having been created
createdNodes.put(token[i], child);
}
// Increment the counter of the child node
child.getKnoten().inkZaehler();
// Set new parent
parentNode = child.getKnoten();
parentURI = child.getUri();
}
}
