Class TraversalDFS

java.lang.Object
com.sparsity.sparksee.algorithms.Traversal
com.sparsity.sparksee.algorithms.TraversalDFS
All Implemented Interfaces:
Closeable, AutoCloseable
public class TraversalDFS extends Traversal
Depth-First Search (DFS) implementation of Traversal.

Starting from a source or root node, it visits as far as possible along each branch before backtracking.

Check out the 'Algorithms' section in the SPARKSEE User Manual for more details on this.

Author:
Sparsity Technologies http://www.sparsity-technologies.com

  • Constructor Details

    • TraversalDFS

      public TraversalDFS(Session session, long node)
      Creates a new instance.

      Parameters:
      session - [in] Session to get the graph from and perform traversal.
      node - [in] Node to start traversal from.

  • Method Details

    • addEdgeType

      public void addEdgeType(int type, EdgesDirection dir)
      Allows for traversing edges of the given type.

      Overrides:
      addEdgeType in class Traversal
      Parameters:
      type - [in] Edge type.
      dir - [in] Edge direction.

    • excludeNodes

      public void excludeNodes(Objects nodes)
      Set which nodes can't be used.

      This will replace any previously specified set of excluded nodes. Should only be used to exclude the usage of specific nodes from allowed node types because it's less efficient than not allowing a node type.

      Overrides:
      excludeNodes in class Traversal
      Parameters:
      nodes - [in] A set of node identifiers that must be kept intact until the destruction of the class.

    • addAllEdgeTypes

      public void addAllEdgeTypes(EdgesDirection dir)
      Allows for traversing all edge types of the graph.

      Overrides:
      addAllEdgeTypes in class Traversal
      Parameters:
      dir - [in] Edge direction.

    • addNodeType

      public void addNodeType(int type)
      Allows for traversing nodes of the given type.

      Overrides:
      addNodeType in class Traversal
      Parameters:
      type - The node type to add

    • excludeEdges

      public void excludeEdges(Objects edges)
      Set which edges can't be used.

      This will replace any previously specified set of excluded edges. Should only be used to exclude the usage of specific edges from allowed edge types because it's less efficient than not allowing an edge type.

      Overrides:
      excludeEdges in class Traversal
      Parameters:
      edges - [in] A set of edge identifiers that must be kept intact until the destruction of the class.

    • next

      public long next()
      Gets the next object of the traversal.

      Overrides:
      next in class Traversal
      Returns:
      A node or edge identifier.

    • hasNext

      public boolean hasNext()
      Gets if there are more objects to be traversed.

      Overrides:
      hasNext in class Traversal
      Returns:
      TRUE if there are more objects, FALSE otherwise.

    • getCurrentDepth

      public int getCurrentDepth()
      Returns the depth of the current node.

      That is, it returns the depth of the node returned in the last call to Next().

      Overrides:
      getCurrentDepth in class Traversal
      Returns:
      The depth of the current node.

    • addAllNodeTypes

      public void addAllNodeTypes()
      Allows for traversing all node types of the graph.

      Overrides:
      addAllNodeTypes in class Traversal

    • setMaximumHops

      public void setMaximumHops(int maxhops)
      Sets the maximum hops restriction.

      All paths longer than the maximum hops restriction will be ignored.

      Overrides:
      setMaximumHops in class Traversal
      Parameters:
      maxhops - [in] The maximum hops restriction. It must be positive or zero. Zero, the default value, means unlimited.