Examples with ParcelableTraversalDescription org.neo4j.android.common.ParcelableTraversalDescription used on opensource projects

Example 1 with ParcelableTraversalDescription

use of org.neo4j.android.common.ParcelableTraversalDescription in project neo4j-mobile-android by neo4j-contrib.

the class DbWrapper method traverse.

@Override
public INodeIterator traverse(ParcelableTraversalDescription desc, long startNodeId, ParcelableError err) throws RemoteException {
    try {
        resumeTrxIfExists();
        try {
            Node startNode = mDb.getNodeById(startNodeId);
            if (startNode == null) {
                throw new IllegalArgumentException("Illegal start node for traversal");
            }
            TraversalDescription traversalDesc = Traversal.description();
            // map order
            switch(desc.getOrder()) {
                case BREADTH_FIRST:
                    traversalDesc = traversalDesc.breadthFirst();
                    break;
                case DEPTH_FIRST:
                    traversalDesc = traversalDesc.depthFirst();
                    break;
            }
            // map uniqueness
            switch(desc.getUniqueness()) {
                case NONE:
                    traversalDesc = traversalDesc.uniqueness(Uniqueness.NONE);
                    break;
                case NODE_GLOBAL:
                    traversalDesc = traversalDesc.uniqueness(Uniqueness.NODE_GLOBAL);
                    break;
                case NODE_RECENT:
                    traversalDesc = traversalDesc.uniqueness(Uniqueness.NODE_RECENT);
                    break;
                case NODE_PATH:
                    traversalDesc = traversalDesc.uniqueness(Uniqueness.NODE_PATH);
                    break;
                case RELATIONSHIP_GLOBAL:
                    traversalDesc = traversalDesc.uniqueness(Uniqueness.RELATIONSHIP_GLOBAL);
                    break;
                case RELATIONSHIP_PATH:
                    traversalDesc = traversalDesc.uniqueness(Uniqueness.RELATIONSHIP_PATH);
                    break;
                case RELATIONSHIP_RECENT:
                    traversalDesc = traversalDesc.uniqueness(Uniqueness.RELATIONSHIP_RECENT);
                    break;
            }
            // map relationships
            for (String name : desc.getRelationships().keySet()) {
                RelationshipType type = new SimpleRelationshipType(name);
                Direction direction = Direction.valueOf(desc.getRelationships().get(name).name());
                traversalDesc = traversalDesc.relationships(type, direction);
            }
            // TODO: support paths
            Iterator<Node> nodeIterator = traversalDesc.traverse(startNode).nodes().iterator();
            return new NodeIteratorWrapper(nodeIterator);
        } finally {
            suspendCurrentTrx("traverse");
        }
    } catch (Exception e) {
        err.setError(Errors.TRANSACTION, e.getMessage());
        return null;
    }
}