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## weka.clusterers.forOPTICSAndDBScan.Utils
Class UpdateQueue

    java.lang.Object
      weka.clusterers.forOPTICSAndDBScan.Utils.UpdateQueue

All Implemented Interfaces:
  RevisionHandler

    public class UpdateQueue

extends java.lang.Object
implements RevisionHandler

UpdateQueue.java
Authors: Rainer Holzmann, Zhanna Melnikova-Albrecht, Matthias Schubert
Date: Aug 27, 2004
Time: 5:36:35 PM
$ Revision 1.4 $

Version:
  $Revision: 1.3 $
Author:
  Matthias Schubert (schubert@dbs.ifi.lmu.de), Zhanna Melnikova-Albrecht (melnikov@cip.ifi.lmu.de), Rainer Holzmann (holzmann@cip.ifi.lmu.de)

Constructor Summary
`UpdateQueue()` Creates a new PriorityQueue (backed on a binary heap) with the ability to efficiently update the priority of the stored objects in the heap.

Method Summary
`void` | `add(double priority, java.lang.Object o, java.lang.String objectKey)` Adds a new Object to the queue
`double` | `getPriority(int index)` Returns the priority for the object at the specified index
`java.lang.String` | `getRevision()` Returns the revision string.
`boolean` | `hasNext()` Tests, if the queue has some more elements left
`UpdateQueueElement` | `next()` Returns the element with the lowest priority
`int` | `size()` Returns the queue's size

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

Constructor Detail

### UpdateQueue

    public UpdateQueue()

  Creates a new PriorityQueue (backed on a binary heap) with the ability to efficiently update the priority of the stored objects in the heap. The ascending (!) queue is dynamically growing and shrinking.

Method Detail

### add

    public void add(double priority,
                    java.lang.Object o,
                    java.lang.String objectKey)

  Adds a new Object to the queue

  Parameters:
    `priority` - The priority associated with the object (in this case: the reachability-distance)
    `objectKey` - The key for this object
    `o` -

### getPriority

    public double getPriority(int index)

  Returns the priority for the object at the specified index

  Parameters:
    `index` - the index of the object
  Returns:
    priority

### size

    public int size()

  Returns the queue's size

  Returns:
    size

### hasNext

    public boolean hasNext()

  Tests, if the queue has some more elements left

  Returns:
    true, if there are any elements left, else false

### next

    public UpdateQueueElement next()

  Returns the element with the lowest priority

  Returns:
    next element

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Returns:
    the revision

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