public String getGroups(@Name("filter") String filter) {
StringWriter resultWriter = new StringWriter();
JsonFactory f = new JsonFactory();
f.setCodec(om);
JsonGenerator g;
try {
g = f.createGenerator(resultWriter);
final Node target = DB.getIndex().get("id", "agents").getSingle();
TraversalDescription td =
Traversal.description()
.relationships(RelTypes.SUBGROUP, Direction.OUTGOING)
.uniqueness(Uniqueness.NODE_PATH);
Traverser results = td.traverse(target);
g.writeStartArray();
Iterator<Path> paths = results.iterator();
while (paths.hasNext()) {
Path path = paths.next();
if (!path.endNode().hasProperty("name")) continue;
g.writeStartObject();
g.writeStringField("name", (String) path.endNode().getProperty("name"));
g.writeArrayFieldStart("path");
for (Node pathStep : path.nodes()) {
if (pathStep.hasProperty("name")) g.writeString((String) pathStep.getProperty("name"));
}
g.writeEndArray();
g.writeEndObject();
}
g.writeEndArray();
g.flush();
} catch (IOException e) {
e.printStackTrace();
}
resultWriter.flush();
return resultWriter.toString();
}
// Generate test data in graph like manner:
private static boolean generateTestData() {
GraphDatabaseService db = DB.get();
System.out.println("GenerateTestData() called!");
Node rootNode = DB.getIndex().get("id", "agents").getSingle();
if (rootNode == null) {
Transaction tx = DB.get().beginTx();
try {
rootNode = db.createNode();
rootNode.setProperty("id", "agents");
ArrayList<Node> groups = new ArrayList<Node>(5);
Node friendsNode = db.createNode();
friendsNode.setProperty("name", "friends");
rootNode.createRelationshipTo(friendsNode, RelTypes.SUBGROUP);
groups.add(friendsNode);
Node schoolDaysNode = db.createNode();
schoolDaysNode.setProperty("name", "schooldays");
friendsNode.createRelationshipTo(schoolDaysNode, RelTypes.SUBGROUP);
groups.add(schoolDaysNode);
Node colleaguesNode = db.createNode();
colleaguesNode.setProperty("name", "colleagues");
rootNode.createRelationshipTo(colleaguesNode, RelTypes.SUBGROUP);
groups.add(colleaguesNode);
Node projectNode = db.createNode();
projectNode.setProperty("name", "project X");
colleaguesNode.createRelationshipTo(projectNode, RelTypes.SUBGROUP);
groups.add(projectNode);
Node familyNode = db.createNode();
familyNode.setProperty("name", "family");
rootNode.createRelationshipTo(familyNode, RelTypes.SUBGROUP);
groups.add(familyNode);
ArrayList<String> names = new ArrayList<String>(20);
names.add("Jan");
names.add("Erika");
names.add("Loes");
names.add("Piet");
names.add("Klaas");
names.add("Joop");
names.add("Jaap");
names.add("Daniel");
names.add("Annelies");
names.add("Esther");
names.add("Noa");
names.add("Lisette");
names.add("Dorien");
names.add("Bert");
names.add("Erik");
names.add("Albert");
names.add("Hielke");
names.add("Ilka");
names.add("Tamara");
names.add("Sietse");
names.add("Gerben");
names.add("George");
names.add("Ida");
names.add("Leonie");
for (String name : names) {
Node node = db.createNode();
node.setProperty("name", name);
Node group = groups.get((int) Math.floor(Math.random() * groups.size()));
group.createRelationshipTo(node, RelTypes.GROUPMEMBER);
if (Math.random() >= 0.5) {
Node secondGroup = groups.get((int) Math.floor(Math.random() * groups.size()));
if (!secondGroup.equals(group))
secondGroup.createRelationshipTo(node, RelTypes.GROUPMEMBER);
}
}
tx.success();
} finally {
tx.finish();
}
}
System.out.println("Found rootnode:" + rootNode.getId() + ":" + rootNode.toString());
return true;
}
public String getContacts(@Name("filter") String filter) {
StringWriter resultWriter = new StringWriter();
JsonFactory f = new JsonFactory();
f.setCodec(om);
JsonGenerator g;
try {
g = f.createGenerator(resultWriter);
final Node target = DB.getIndex().get("id", "agents").getSingle();
TraversalDescription td =
Traversal.description()
.relationships(RelTypes.GROUPMEMBER, Direction.OUTGOING)
.relationships(RelTypes.SUBGROUP, Direction.OUTGOING)
.uniqueness(Uniqueness.NODE_PATH)
.evaluator(
new Evaluator() {
@Override
public Evaluation evaluate(Path path) {
if (path.endNode().hasProperty("name")
&& path.lastRelationship().isType(RelTypes.GROUPMEMBER)) {
return Evaluation.INCLUDE_AND_PRUNE;
}
return Evaluation.EXCLUDE_AND_CONTINUE;
}
});
Traverser results = td.traverse(target);
Multimap<Long, Path> groupByNode = ArrayListMultimap.create();
Iterator<Path> paths = results.iterator();
while (paths.hasNext()) {
Path path = paths.next();
groupByNode.put(path.endNode().getId(), path);
}
g.writeStartArray();
for (Long nodeId : groupByNode.keySet()) {
List<Path> pathList = (List<Path>) groupByNode.get(nodeId);
g.writeStartObject();
Node node = pathList.get(0).endNode();
g.writeStringField("name", (String) node.getProperty("name"));
g.writeArrayFieldStart("groups");
for (Path path : pathList) {
g.writeStartObject();
g.writeStringField(
"name", (String) path.lastRelationship().getStartNode().getProperty("name"));
g.writeArrayFieldStart("path");
for (Node pathStep : path.nodes()) {
if (!pathStep.equals(node) && pathStep.hasProperty("name"))
g.writeString((String) pathStep.getProperty("name"));
}
g.writeEndArray();
g.writeEndObject();
}
g.writeEndArray();
g.writeEndObject();
}
g.writeEndArray();
g.flush();
} catch (IOException e) {
e.printStackTrace();
}
resultWriter.flush();
return resultWriter.toString();
}