Package elki.database.relation

Class ProxyView<O>

java.lang.Object

elki.database.relation.ProxyView<O>

Type Parameters:

O - Object type

All Implemented Interfaces:

Relation<O>

public class ProxyView<O>
extends java.lang.Object
implements Relation<O>

A virtual partitioning of the database. For the accepted DBIDs, access is passed on to the wrapped representation.

Since:

0.4.0

Author:

Erich Schubert

Field Summary

Fields

Modifier and Type	Field	Description
private DBIDs	idview	The DBIDs we contain
private Relation<O>	inner	The wrapped representation where we get the IDs from.

Constructor Summary

Constructors

Constructor	Description
ProxyView(DBIDs idview, Relation<O> inner)	Constructor.

Method Summary

Modifier and Type	Method	Description
O	get(DBIDRef id)	Get the representation of an object.
SimpleTypeInformation<O>	getDataTypeInformation()	Get the data type of this representation
DBIDs	getDBIDs()	Get the IDs the query is defined for.
java.lang.String	getLongName()	Get a long (human readable) name for the relation.
DBIDIter	iterDBIDs()	Get an iterator access to the DBIDs.
void	setDBIDs(DBIDs ids)	Set the DBIDs to use.
int	size()	Get the number of DBIDs.

Methods inherited from class java.lang.Object

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

Methods inherited from interface elki.database.relation.Relation

forEach

Field Detail

idview

private DBIDs idview

The DBIDs we contain

inner

private final Relation<O> inner

The wrapped representation where we get the IDs from.

Constructor Detail

ProxyView

public ProxyView(DBIDs idview,
                 Relation<O> inner)

Constructor.

Parameters:

idview - Ids to expose

inner - Inner representation

Method Detail

get

public O get(DBIDRef id)

Description copied from interface: Relation

Get the representation of an object.

Specified by:

get in interface Relation<O>

Parameters:

id - Object ID

Returns:

object instance

getDBIDs

public DBIDs getDBIDs()

Description copied from interface: Relation

Get the IDs the query is defined for.

If possible, prefer Relation.iterDBIDs().

Specified by:

getDBIDs in interface Relation<O>

Returns:

IDs this is defined for

iterDBIDs

public DBIDIter iterDBIDs()

Description copied from interface: Relation

Get an iterator access to the DBIDs.

To iterate over all IDs, use the following code fragment:

 
 for(DBIDIter iter = relation.iterDBIDs(); iter.valid(); iter.advance()) {
    relation.get(iter); // Get the current element
 }
 
 

Specified by:

iterDBIDs in interface Relation<O>

Returns:

iterator for the DBIDs.

size

public int size()

Description copied from interface: Relation

Get the number of DBIDs.

Specified by:

size in interface Relation<O>

Returns:

Size

getDataTypeInformation

public SimpleTypeInformation<O> getDataTypeInformation()

Description copied from interface: Relation

Get the data type of this representation

Specified by:

getDataTypeInformation in interface Relation<O>

Returns:

Data type

getLongName

public java.lang.String getLongName()

Description copied from interface: Relation

Get a long (human readable) name for the relation.

Specified by:

getLongName in interface Relation<O>

Returns:

Relation name

setDBIDs

public void setDBIDs(DBIDs ids)

Set the DBIDs to use.

Parameters:

ids - DBIDs