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## javafe.filespace
Class HashTree

    java.lang.Object
      javafe.filespace.Tree
          javafe.filespace.HashTree

Direct Known Subclasses:
  ExtTree, PreloadedTree

abstract class HashTree
extends Tree

A HashTree is a Tree that uses a Hashtable to store the map between labels and its direct children.

This abstract class leaves how the Hashtable should be filled up to its subclasses.

Field Summary
`protected java.util.Hashtable` | `edges` The mapping between our outgoing edge's labels and the subTrees they point to.

Fields inherited from class javafe.filespace.Tree
`data`

Constructor Summary
`` | `HashTree(java.lang.Object data)` Create a root node:
`protected` | `HashTree(Tree parent, java.lang.String label, java.lang.Object data)` Create a non-root node:

Method Summary
`java.util.Enumeration` | `children()` An enumeration of this node's direct children.
`Tree` | `getChild(java.lang.String label)` Fetch our direct child along the edge labelled label.

Methods inherited from class javafe.filespace.Tree
`getChildrenCount, getLabel, getParent, getQualifiedChild, getQualifiedName, getRootNode, getSimpleName, isLeaf, print, printDetails`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### edges

    protected java.util.Hashtable edges

  The mapping between our outgoing edge's labels and the subTrees they point to. No entry for a label means no edge with that label exists.

  Invariant: all elements of edges are Trees and all keys are Strings.

Constructor Detail

### HashTree

    public HashTree(java.lang.Object data)

  Create a root node:

### HashTree

    protected HashTree(Tree parent,
                       java.lang.String label,
                       java.lang.Object data)

  Create a non-root node:

Method Detail

### children

    public java.util.Enumeration children()

  An enumeration of this node's direct children. Each child occurs exactly once in the enumeration. The order is unspecified and may differ from call to call.

  Note: The Objects returned by the resulting enumeration's nextElement method are guaranteed to be of type Tree and non-null.

  Specified by:
    `children` in class `Tree`

### getChild

    public Tree getChild(java.lang.String label)

  Fetch our direct child along the edge labelled label. Iff there is no such child, return null.

  Overrides:
    `getChild` in class `Tree`

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| ESC/Java2 © 2003,2004,2005 David Cok and Joseph Kiniry © 2005 UCD Dublin © 2003,2004 Radboud University Nijmegen © 1999,2000 Compaq Computer Corporation © 1997,1998,1999 Digital Equipment Corporation All Rights Reserved
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