Package mondrian.olap

Class Walker

  • All Implemented Interfaces:
    Enumeration
    public class Walker
extends Object
implements Enumeration
    Walks over a tree, returning nodes in prefix order. Objects which are an instance of Walkable supply their children using getChildren(); other objects are assumed to have no children.

    If the tree is modified during the enumeration, strange things may happen.

    Example use:

        Tree t;
    Walker w = new Walker(t);
    while (w.hasMoreElements()) {
      Tree node = (Tree) w.nextNode();
      System.out.println(node.toString());
    }

    • Constructor Detail

      • Walker

        public Walker​(mondrian.olap.Walkable root)

    • Method Detail

      • prune

        public void prune()
        Tell walker that we don't want to visit any (more) children of this node. The next node visited will be (a return visit to) the node's parent. Not valid until nextElement() has been called.

      • pruneSiblings

        public void pruneSiblings()

      • currentElement

        public Object currentElement()
        returns the current object. Not valid until nextElement() has been called.

      • level

        public int level()
        returns level in the tree of the current element (that is, last element returned from nextElement()). The level of the root element is 0.

      • getParent

        public final Object getParent()

      • getAncestor

        public final Object getAncestor​(int iDepth)

      • getOrdinal

        public int getOrdinal()
        get the ordinal within its parent node of the current node. Returns 0 for the root element. Equivalent to getAncestorOrdinal(0).

      • getAncestorOrdinal

        public int getAncestorOrdinal​(int iDepth)
        get the ordinal within its parent node of the iDepthth ancestor.

      • getChildren

        public Object[] getChildren​(Object node)
        Override this function to prune the tree, or to allow objects which are not Walkable to have children.

      • main

        public static void main​(String[] args)