Package com.googlecode.concurrenttrees.radix.node.util

Class NodeUtil

  • public class NodeUtil
extends java.lang.Object
    Static utility methods useful when implementing Nodes.

    • Constructor Summary

      Constructors 
      Constructor Description
      NodeUtil()
      Private constructor, not used.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static int binarySearchForEdge​(java.util.concurrent.atomic.AtomicReferenceArray<Node> childNodes, java.lang.Character edgeFirstCharacter)
      Returns the index of the node in the given AtomicReferenceArray whose edge starts with the given first character.
      static void ensureNoDuplicateEdges​(java.util.List<Node> nodes)
      Throws an exception if any nodes in the given list represent edges having the same first character.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • NodeUtil

        NodeUtil()
        Private constructor, not used.

    • Method Detail

      • binarySearchForEdge

        public static int binarySearchForEdge​(java.util.concurrent.atomic.AtomicReferenceArray<Node> childNodes,
                                      java.lang.Character edgeFirstCharacter)
        Returns the index of the node in the given AtomicReferenceArray whose edge starts with the given first character.

        This method expects that some constraints are enforced on the AtomicReferenceArray:

        • The array must already be in ascending sorted order of the first character of the edge for each node
        • No entries in the array can be null
        • Any existing node in the array cannot be swapped concurrently for another unless the edge associated with the other node also starts with the same first character
        If these constraints are enforced as expected, then this method will have deterministic behaviour even in the face of concurrent modification.
        Parameters:
        childNodes - An AtomicReferenceArray of Node objects, which is used in accordance with the constraints documented in this method
        edgeFirstCharacter - The first character of the edge for which the associated node is required
        Returns:
        The index of the node representing the indicated edge, or a value < 0 if no such node exists in the array

      • ensureNoDuplicateEdges

        public static void ensureNoDuplicateEdges​(java.util.List<Node> nodes)
        Throws an exception if any nodes in the given list represent edges having the same first character.
        Parameters:
        nodes - The list of nodes to validate
        Throws:
        java.lang.IllegalStateException - If a duplicate edge is detected