de.lmu.ifi.dbs.elki.database

Class HashmapDatabase

java.lang.Object

de.lmu.ifi.dbs.elki.result.AbstractHierarchicalResult

de.lmu.ifi.dbs.elki.database.AbstractDatabase

de.lmu.ifi.dbs.elki.database.HashmapDatabase

All Implemented Interfaces:

Database, UpdatableDatabase, HierarchicalResult, Result, InspectionUtilFrequentlyScanned, Parameterizable

@Description(value="Database using an in-memory hashtable and at least providing linear scans.")
public class HashmapDatabase
extends AbstractDatabase
implements UpdatableDatabase, Parameterizable

Provides a mapping for associations based on a Hashtable and functions to get the next usable ID for insertion, making IDs reusable after deletion of the entry.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	HashmapDatabase.Parameterizer Parameterization class.

Field Summary

Fields

Modifier and Type	Field and Description
protected DatabaseConnection	databaseConnection The data source we get the initial data from.
private DBIDView	idrep The DBID representation we use
private TreeSetModifiableDBIDs	ids IDs of this database
private static Logging	logger Our logger

Fields inherited from class de.lmu.ifi.dbs.elki.database.AbstractDatabase

eventManager, INDEX_ID, indexes, indexFactories, relations

Constructor Summary

Constructors

Constructor and Description
HashmapDatabase() Constructor with no indexes.
HashmapDatabase(DatabaseConnection databaseConnection, Collection<IndexFactory<?,?>> indexFactories) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
private Relation<?>	addNewRelation(SimpleTypeInformation<?> meta) Add a new representation for the given meta.
protected Relation<?>[]	alignColumns(ObjectBundle pack) Find a mapping from package columns to database columns, eventually adding new database columns when needed.
MultipleObjectsBundle	delete(DBIDs ids) Removes the objects from the database (by calling doDelete(DBID) for each object) and indexes and fires a deletion event.
private void	doDelete(DBID id) Removes the object with the specified id from this database.
StaticDBIDs	getDBIDs() Deprecated.
protected Logging	getLogger()
void	initialize() Initialize the database by getting the initial data from the database connection.
DBIDs	insert(ObjectBundle objpackages) Inserts the given object(s) and their associations into the database.
private void	restoreID(DBID id) Makes the given id reusable for new insertion operations.
int	size() Deprecated.

Methods inherited from class de.lmu.ifi.dbs.elki.database.AbstractDatabase

accumulateDataStoreEvents, addDataStoreListener, addIndex, flushDataStoreEvents, getBundle, getDistanceQuery, getIndexes, getKNNQuery, getLongName, getRangeQuery, getRelation, getRelations, getRKNNQuery, getShortName, getSimilarityQuery, removeDataStoreListener, removeIndex

Methods inherited from class de.lmu.ifi.dbs.elki.result.AbstractHierarchicalResult

addChildResult, getHierarchy, setHierarchy

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.lmu.ifi.dbs.elki.database.Database

accumulateDataStoreEvents, addDataStoreListener, addIndex, flushDataStoreEvents, getBundle, getDistanceQuery, getIndexes, getKNNQuery, getRangeQuery, getRelation, getRelations, getRKNNQuery, getSimilarityQuery, removeDataStoreListener, removeIndex

Methods inherited from interface de.lmu.ifi.dbs.elki.result.HierarchicalResult

getHierarchy, setHierarchy

Methods inherited from interface de.lmu.ifi.dbs.elki.result.Result

getLongName, getShortName

Field Detail

logger

private static final Logging logger

Our logger

ids

private TreeSetModifiableDBIDs ids

IDs of this database

idrep

private final DBIDView idrep

The DBID representation we use

databaseConnection

protected DatabaseConnection databaseConnection

The data source we get the initial data from.

Constructor Detail

HashmapDatabase

public HashmapDatabase(DatabaseConnection databaseConnection,
               Collection<IndexFactory<?,?>> indexFactories)

Constructor.

Parameters:

databaseConnection - Database connection to get the initial data from.

indexFactories - Indexes to add

HashmapDatabase

public HashmapDatabase()

Constructor with no indexes.

Method Detail

initialize

public void initialize()

Initialize the database by getting the initial data from the database connection.

Specified by:

initialize in interface Database

insert

public DBIDs insert(ObjectBundle objpackages)

Description copied from interface: UpdatableDatabase

Inserts the given object(s) and their associations into the database.

Specified by:

insert in interface UpdatableDatabase

Parameters:

objpackages - the objects to be inserted

Returns:

the IDs assigned to the inserted objects

alignColumns

protected Relation<?>[] alignColumns(ObjectBundle pack)

Find a mapping from package columns to database columns, eventually adding new database columns when needed.

Parameters:

pack - Package to process

Returns:

Column mapping

addNewRelation

private Relation<?> addNewRelation(SimpleTypeInformation<?> meta)

Add a new representation for the given meta.

Parameters:

meta - meta data

Returns:

new representation

delete

public MultipleObjectsBundle delete(DBIDs ids)

Removes the objects from the database (by calling doDelete(DBID) for each object) and indexes and fires a deletion event.

Specified by:

delete in interface UpdatableDatabase

Parameters:

ids - the ids of the object to be removed from the database

Returns:

the objects that have been removed

doDelete

private void doDelete(DBID id)

Removes the object with the specified id from this database.

Parameters:

id - id the id of the object to be removed

size

@Deprecated
public final int size()

Deprecated.

Description copied from interface: Database

Returns the number of objects contained in this Database.

Specified by:

size in interface Database

Returns:

the number of objects in this Database

getDBIDs

@Deprecated
public StaticDBIDs getDBIDs()

Deprecated.

Description copied from interface: Database

Returns a list comprising all IDs currently in use. The list returned shall not be linked to any actual list possibly hold in the database implementation.

Specified by:

getDBIDs in interface Database

Returns:

a list comprising all IDs currently in use

restoreID

private void restoreID(DBID id)

Makes the given id reusable for new insertion operations.

Parameters:

id - the id to become reusable

getLogger

protected Logging getLogger()

Specified by:

getLogger in class AbstractDatabase