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## weka.clusterers.forOPTICSAndDBScan.Databases
Class SequentialDatabase

    java.lang.Object
      weka.clusterers.forOPTICSAndDBScan.Databases.SequentialDatabase

All Implemented Interfaces:
  java.io.Serializable, Database, RevisionHandler

    public class SequentialDatabase

extends java.lang.Object
implements Database, java.io.Serializable, RevisionHandler

SequentialDatabase.java
Authors: Rainer Holzmann, Zhanna Melnikova-Albrecht, Matthias Schubert
Date: Aug 20, 2004
Time: 1:23:38 PM
$ Revision 1.4 $

Version:
  $Revision: 1.4 $
Author:
  Matthias Schubert (schubert@dbs.ifi.lmu.de), Zhanna Melnikova-Albrecht (melnikov@cip.ifi.lmu.de), Rainer Holzmann (holzmann@cip.ifi.lmu.de)
See Also:
  Serialized Form

Constructor Summary
`SequentialDatabase(Instances instances)` Constructs a new sequential database and holds the original instances

Method Summary
`boolean` | `contains(DataObject dataObject_Query)` Tests if the database contains the dataObject_Query
`java.util.List` | `coreDistance(int minPoints, double epsilon, DataObject dataObject)` Calculates the coreDistance for the specified DataObject.
`java.util.Iterator` | `dataObjectIterator()` Returns an iterator over all the dataObjects in the database
`java.util.List` | `epsilonRangeQuery(double epsilon, DataObject queryDataObject)` Performs an epsilon range query for this dataObject
`double[]` | `getAttributeMaxValues()` Returns the array of maximum-values for each attribute
`double[]` | `getAttributeMinValues()` Returns the array of minimum-values for each attribute
`DataObject` | `getDataObject(java.lang.String key)` Select a dataObject from the database
`Instances` | `getInstances()` Returns the original instances delivered from WEKA
`java.lang.String` | `getRevision()` Returns the revision string.
`void` | `insert(DataObject dataObject)` Inserts a new dataObject into the database
`java.util.List` | `k_nextNeighbourQuery(int k, double epsilon, DataObject dataObject)` Emits the k next-neighbours and performs an epsilon-range-query at the parallel.
`java.util.Iterator` | `keyIterator()` Returns an iterator over all the keys
`void` | `setMinMaxValues()` Sets the minimum and maximum values for each attribute in different arrays by walking through every DataObject of the database
`int` | `size()` Returns the size of the database (the number of dataObjects in the database)

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

Constructor Detail

### SequentialDatabase

    public SequentialDatabase(Instances instances)

  Constructs a new sequential database and holds the original instances

  Parameters:
    `instances` -

Method Detail

### getDataObject

    public DataObject getDataObject(java.lang.String key)

  Select a dataObject from the database

  Specified by:
    `getDataObject` in interface `Database`
  Parameters:
    `key` - The key that is associated with the dataObject
  Returns:
    dataObject

### setMinMaxValues

    public void setMinMaxValues()

  Sets the minimum and maximum values for each attribute in different arrays by walking through every DataObject of the database

  Specified by:
    `setMinMaxValues` in interface `Database`

### getAttributeMinValues

    public double[] getAttributeMinValues()

  Returns the array of minimum-values for each attribute

  Specified by:
    `getAttributeMinValues` in interface `Database`
  Returns:
    attributeMinValues

### getAttributeMaxValues

    public double[] getAttributeMaxValues()

  Returns the array of maximum-values for each attribute

  Specified by:
    `getAttributeMaxValues` in interface `Database`
  Returns:
    attributeMaxValues

### epsilonRangeQuery

    public java.util.List epsilonRangeQuery(double epsilon,
                                            DataObject queryDataObject)

  Performs an epsilon range query for this dataObject

  Specified by:
    `epsilonRangeQuery` in interface `Database`
  Parameters:
    `epsilon` - Specifies the range for the query
    `queryDataObject` - The dataObject that is used as query-object for epsilon range query
  Returns:
    List with all the DataObjects that are within the specified range

### k_nextNeighbourQuery

    public java.util.List k_nextNeighbourQuery(int k,
                                               double epsilon,
                                               DataObject dataObject)

  Emits the k next-neighbours and performs an epsilon-range-query at the parallel. The returned list contains two elements: At index=0 --> list with all k next-neighbours; At index=1 --> list with all dataObjects within epsilon;

  Specified by:
    `k_nextNeighbourQuery` in interface `Database`
  Parameters:
    `k` - number of next neighbours
    `epsilon` - Specifies the range for the query
    `dataObject` - the start object
  Returns:
    list with the k-next neighbours (PriorityQueueElements) and a list with candidates from the epsilon-range-query (EpsilonRange_ListElements)

### coreDistance

    public java.util.List coreDistance(int minPoints,
                                       double epsilon,
                                       DataObject dataObject)

  Calculates the coreDistance for the specified DataObject. The returned list contains three elements: At index=0 --> list with all k next-neighbours; At index=1 --> list with all dataObjects within epsilon; At index=2 --> coreDistance as Double-value

  Specified by:
    `coreDistance` in interface `Database`
  Parameters:
    `minPoints` - minPoints-many neighbours within epsilon must be found to have a non-undefined coreDistance
    `epsilon` - Specifies the range for the query
    `dataObject` - Calculate coreDistance for this dataObject
  Returns:
    list with the k-next neighbours (PriorityQueueElements) and a list with candidates from the epsilon-range-query (EpsilonRange_ListElements) and the double-value for the calculated coreDistance

### size

    public int size()

  Returns the size of the database (the number of dataObjects in the database)

  Specified by:
    `size` in interface `Database`
  Returns:
    size

### keyIterator

    public java.util.Iterator keyIterator()

  Returns an iterator over all the keys

  Specified by:
    `keyIterator` in interface `Database`
  Returns:
    iterator

### dataObjectIterator

    public java.util.Iterator dataObjectIterator()

  Returns an iterator over all the dataObjects in the database

  Specified by:
    `dataObjectIterator` in interface `Database`
  Returns:
    iterator

### contains

    public boolean contains(DataObject dataObject_Query)

  Tests if the database contains the dataObject_Query

  Specified by:
    `contains` in interface `Database`
  Parameters:
    `dataObject_Query` - The query-object
  Returns:
    true if the database contains dataObject_Query, else false

### insert

    public void insert(DataObject dataObject)

  Inserts a new dataObject into the database

  Specified by:
    `insert` in interface `Database`
  Parameters:
    `dataObject` -

### getInstances

    public Instances getInstances()

  Returns the original instances delivered from WEKA

  Specified by:
    `getInstances` in interface `Database`
  Returns:
    instances

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

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

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