Examples with StopEvaluator org.neo4j.graphdb.StopEvaluator used on opensource projects

Example 6 with StopEvaluator

use of org.neo4j.graphdb.StopEvaluator in project graphdb by neo4j-attic.

the class TestTraversal method testStopOnPreviousNode.

// Verifies that the stop evaluator can stop based on the previous node
@Test
public void testStopOnPreviousNode() throws Exception {
    // Build ise tree
    Node root = this.buildIseTreePopulation();
    // Traverse only ISE relationships
    RelationshipType[] traversableRels = new RelationshipType[] { MyRelTypes.TEST };
    // Construct a stop evaluator that stops on nodes 2, 3, and 4
    // (ie root's children)
    StopEvaluator stopEvaluator = new StopEvaluator() {

        public boolean isStopNode(TraversalPosition position) {
            try {
                Node node = position.previousNode();
                String nodeId = (String) node.getProperty("node.test.id");
                return nodeId.equals("1");
            } catch (Exception e) {
                return false;
            }
        }
    };
    // Create a traverser
    Traverser traverser = root.traverse(BREADTH_FIRST, stopEvaluator, ReturnableEvaluator.ALL, traversableRels[0], Direction.BOTH);
    try {
        this.assertNextNodeId(traverser, "1");
        this.assertNextNodeId(traverser, "2");
        this.assertNextNodeId(traverser, "3");
        this.assertNextNodeId(traverser, "4");
        assertTrue("Too many nodes returned from traversal", traverser.iterator().hasNext() == false);
    } catch (java.util.NoSuchElementException nsee) {
        fail("Too few nodes returned from traversal");
    } finally {
        // Delete ise tree and commmit work
        this.deleteNodeTreeRecursively(root, 0);
    }
}