Interface Database
- All Known Implementing Classes:
SequentialDatabase
public interface Database
Database.java
Authors: Rainer Holzmann, Zhanna Melnikova-Albrecht, Matthias Schubert
Date: Aug 20, 2004
Time: 1:03:43 PM
$ Revision 1.4 $
- Version:
- $Revision: 1.2 $
- Author:
- Matthias Schubert (schubert@dbs.ifi.lmu.de), Zhanna Melnikova-Albrecht (melnikov@cip.ifi.lmu.de), Rainer Holzmann (holzmann@cip.ifi.lmu.de)
-
Method Summary
Modifier and TypeMethodDescriptionboolean
contains
(DataObject dataObject_Query) Tests if the database contains the dataObject_QuerycoreDistance
(int minPoints, double epsilon, DataObject dataObject) Calculates the coreDistance for the specified DataObject.Returns an iterator over all the dataObjects in the databaseepsilonRangeQuery
(double epsilon, DataObject queryDataObject) Performs an epsilon range query for this dataObjectdouble[]
Returns the array of maximum-values for each attributedouble[]
Returns the array of minimum-values for each attributegetDataObject
(String key) Select a dataObject from the databaseReturns the original instances delivered from WEKAvoid
insert
(DataObject dataObject) Inserts a new dataObject into the databasek_nextNeighbourQuery
(int k, double epsilon, DataObject dataObject) Emits the k next-neighbours and performs an epsilon-range-query at the parallel.Returns an iterator over all the keysvoid
Sets the minimum and maximum values for each attribute in different arrays by walking through every DataObject of the databaseint
size()
Returns the size of the database (the number of dataObjects in the database)
-
Method Details
-
getDataObject
Select a dataObject from the database- Parameters:
key
- The key that is associated with the dataObject- Returns:
- dataObject
-
size
int size()Returns the size of the database (the number of dataObjects in the database)- Returns:
- size
-
keyIterator
Iterator keyIterator()Returns an iterator over all the keys- Returns:
- iterator
-
dataObjectIterator
Iterator dataObjectIterator()Returns an iterator over all the dataObjects in the database- Returns:
- iterator
-
contains
Tests if the database contains the dataObject_Query- Parameters:
dataObject_Query
- The query-object- Returns:
- true if the database contains dataObject_Query, else false
-
insert
Inserts a new dataObject into the database- Parameters:
dataObject
-
-
getInstances
Instances getInstances()Returns the original instances delivered from WEKA- Returns:
- instances
-
setMinMaxValues
void setMinMaxValues()Sets the minimum and maximum values for each attribute in different arrays by walking through every DataObject of the database -
getAttributeMinValues
double[] getAttributeMinValues()Returns the array of minimum-values for each attribute- Returns:
- attributeMinValues
-
getAttributeMaxValues
double[] getAttributeMaxValues()Returns the array of maximum-values for each attribute- Returns:
- attributeMaxValues
-
epsilonRangeQuery
Performs an epsilon range query for this dataObject- Parameters:
epsilon
- Specifies the range for the queryqueryDataObject
- 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
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;- Parameters:
k
- number of next neighboursepsilon
- Specifies the range for the querydataObject
- the start object- Returns:
- list with the k-next neighbours (PriorityQueueElements) and a list with candidates from the epsilon-range-query (EpsilonRange_ListElements)
-
coreDistance
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- Parameters:
minPoints
- minPoints-many neighbours within epsilon must be found to have a non-undefined coreDistanceepsilon
- Specifies the range for the querydataObject
- 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
-