Examples of TraversalDescription

org.neo4j.graphdb.traversal.TraversalDescription

Represents a description of a traversal. This interface describes the rules and behavior of a traversal. A traversal description is immutable and each method which adds or modifies the behavior returns a new instances that includes the new modification, leaving the instance which returns the new instance intact. For instance,

 TraversalDescription td = new TraversalDescriptionImpl(); td.depthFirst();

is not going to modify td. you will need to reassign td, like

 td = td.depthFirst();

When all the rules and behaviors have been described the traversal is started by using {@link #traverse(Node)} where a starting node is supplied. The{@link Traverser} that is returned is then used to step through the graph,and return the positions that matches the rules.


    private static TraversalDescription traversal( TraverserImpl traverser,
            Order order, StopEvaluator stopEvaluator,
            ReturnableEvaluator returnableEvaluator )
    {
        TraversalDescription description = BASE_DESCRIPTION;
        switch ( order )
        {
        case BREADTH_FIRST:
            description = description.breadthFirst();
            break;
        case DEPTH_FIRST:
            description = description.depthFirst();
            break;


        default:
            throw new IllegalArgumentException( "Onsupported traversal order: "
                                                + order );
        }


        description = description.prune( new Pruner( traverser, stopEvaluator ) );
        description = description.filter( new Filter( traverser,
                returnableEvaluator ) );


        return description;
    }

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.

Examples of TraversalDescription

Examples of org.neo4j.graphdb.traversal.TraversalDescription