Assigning node labels.

[dwjohnston]

Is it possible to assign node labels in the xml?

From what I can see here and here I should be using the following format to assign labels to nodes:

<node id = "1" labels = ":FOO"> <data key = "labels">:FOO</data></node>

This doesn't work for the neo4j java API.

Here's my full graph xml:

<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns
 http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">

    <key id = "labels" for = "node" attr.name = "labels" attr.type = "string"></key>


    <graph id="G" edgedefault="undirected">

        <node id="1" labels = ":FOO">
            <data key = "labels">:FOO</data>
        </node>

        <node id="2" labels = ":FOO">
            <data key = "labels">:FOO</data>
        </node>

        <node id="3" labels = ":FOO">
            <data key = "labels">:FOO</data>
        </node>

        <node id="4" labels = ":FOO">
            <data key = "labels">:FOO</data>
        </node>



    </graph>
</graphml>

And my test code:

@UsingDataSet(locations = "NoSqlUnitTestTest.xml", loadStrategy = LoadStrategyEnum.CLEAN_INSERT)
public class NoSqlUnitTestTest {

    @ClassRule
    public static EmbeddedNeo4j embeddedNeo4j = newEmbeddedNeo4jRule().build();

    @Rule
    public Neo4jRule neo4jRule = new Neo4jRule(
            newEmbeddedNeoServerConfiguration().build(), this);

    @Inject
    GraphDatabaseService graphDb;


    @Test
    public void TestTest1() {

        Label l = DynamicLabel.label("FOO");

        try (Transaction tx = graphDb.beginTx()) {
            // Test set up sanity tests
            ResourceIterator<Node> createdNodes = graphDb.findNodes(l);
            int i = 0;
            while (createdNodes.hasNext()) {
                i++;
                createdNodes.next();
            }
            assertEquals(3, i);   //FAIL - 3 != 0 

            tx.success();
        }

    }

    @Test
    public void TestTest2() {

        try (Transaction tx = graphDb.beginTx()) {
            Iterable<Node> allNodes = GlobalGraphOperations.at(graphDb)
                    .getAllNodes();

            int i = 0;
            for (Node node : allNodes) {
                i++;
            }
            assertEquals(4, i);    //SUCCESS

            tx.success();
        }
    }

}

Is it possible to configure nosql-unit to assign labels this way?

[dwjohnston]

Apologies, the forth node is meant to have a :BAR label. I can't edit the post because I'm using an out of date browser.

[dwjohnston]

if anyone is interested, here's a work around:

You import the label as a property, and assign it as an actual label in your test setup:

    @Before
    public void setup(){
        try (Transaction tx = graphDb.beginTx()) {
            Iterable<Node> allNodes = GlobalGraphOperations.at(graphDb)
                    .getAllNodes();

            int i = 0;
            for (Node node : allNodes) {
                String labels = (String) node.getProperty("labels"); 
                String[] labelsSplit = labels.split(" ");

                for (String str : labelsSplit){
                    node.addLabel(DynamicLabel.label(str));
                }

            }

            tx.success();
        }
    }

[lordofthejars]

Hi, first of all thank you very much for using NoSQLUnit. The answer, no it is not supported yet, but if you want and can you can provide a PR fixing it. It is about adding <data key="label">PAGE</data> support in the reader and writer of GraphML parser.

It should not be very difficult if you can contribute, the PR would be more than welcomed.