jdbm.htree

Class HashDirectory.HDIterator

java.lang.Object

jdbm.helper.FastIterator

jdbm.htree.HashDirectory.HDIterator

Enclosing class:

HashDirectory

public class HashDirectory.HDIterator
extends FastIterator

Utility class to enumerate keys/values in a HTree

Field Summary

Fields

Modifier and Type	Field and Description
private int	_child Current child position
private java.util.ArrayList	_childStack
private HashDirectory	_dir Current HashDirectory in the hierarchy
private java.util.ArrayList	_dirStack Stacks of directories & last enumerated child position
private java.util.Iterator	_iter Current bucket iterator
private boolean	_iterateKeys True if we're iterating on keys, False if enumerating on values.

Constructor Summary

Constructors

Constructor and Description
HDIterator(boolean iterateKeys) Construct an iterator on this directory.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	next() Returns the next object.
private void	prepareNext() Prepare internal state so we can answer hasMoreElements Actually, this code prepares an Enumeration on the next Bucket to enumerate.

Methods inherited from class java.lang.Object

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

Field Detail

_iterateKeys

private boolean _iterateKeys

True if we're iterating on keys, False if enumerating on values.

_dirStack

private java.util.ArrayList _dirStack

Stacks of directories & last enumerated child position

_childStack

private java.util.ArrayList _childStack

_dir

private HashDirectory _dir

Current HashDirectory in the hierarchy

_child

private int _child

Current child position

_iter

private java.util.Iterator _iter

Current bucket iterator

Constructor Detail

HDIterator

HDIterator(boolean iterateKeys)
    throws java.io.IOException

Construct an iterator on this directory.

Parameters:

iterateKeys - True if iteration supplies keys, False if iterateKeys supplies values.

Throws:

java.io.IOException

Method Detail

next

public java.lang.Object next()

Returns the next object.

Specified by:

next in class FastIterator

Returns:

the next element in the iteration, or null if no more element.

prepareNext

private void prepareNext()
                  throws java.io.IOException

Prepare internal state so we can answer hasMoreElements Actually, this code prepares an Enumeration on the next Bucket to enumerate. If no following bucket is found, the next Enumeration is set to null.

Throws:

java.io.IOException