de.lmu.ifi.dbs.elki.index.tree.metrical.mtreevariants.mktrees.mktab

Class MkTabDirectoryEntry

java.lang.Object

de.lmu.ifi.dbs.elki.index.tree.AbstractDirectoryEntry

de.lmu.ifi.dbs.elki.index.tree.metrical.mtreevariants.MTreeDirectoryEntry

de.lmu.ifi.dbs.elki.index.tree.metrical.mtreevariants.mktrees.mktab.MkTabDirectoryEntry

All Implemented Interfaces:

DirectoryEntry, Entry, MkTabEntry, MTreeEntry, Externalizable, Serializable

 class MkTabDirectoryEntry
extends MTreeDirectoryEntry
implements MkTabEntry

Represents an entry in a directory node of a MkTab-Tree. Additionally to a MTreeLeafEntry a MkTabDirectoryEntry holds a list of its knn distances for parameters k <= k_max.

Since:

0.2

Author:

Elke Achtert

Field Summary

Fields

Modifier and Type	Field and Description
private double[]	knnDistances The aggregated knn distances of the underlying node.
private static long	serialVersionUID

Constructor Summary

Constructors

Constructor and Description
MkTabDirectoryEntry() Empty constructor for serialization purposes.
MkTabDirectoryEntry(DBID objectID, double parentDistance, Integer nodeID, double coveringRadius, double[] knnDistances) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o) Indicates whether some other object is "equal to" this one.
double	getKnnDistance(int k) Returns the knn distance of the entry for the specified parameter k.
double[]	getKnnDistances() Returns the list of knn distances of the entry.
void	readExternal(ObjectInput in) Calls the super method and reads the parameter k_max and knn distance of this entry from the specified input stream.
void	setKnnDistances(double[] knnDistances) Sets the knn distances of the entry.
void	writeExternal(ObjectOutput out) Calls the super method and writes the parameter k_max and the knn distances of this entry to the specified stream.

Methods inherited from class de.lmu.ifi.dbs.elki.index.tree.metrical.mtreevariants.MTreeDirectoryEntry

getCoveringRadius, getParentDistance, getRoutingObjectID, setCoveringRadius, setParentDistance, setRoutingObjectID, toString

Methods inherited from class de.lmu.ifi.dbs.elki.index.tree.AbstractDirectoryEntry

getEntryID, getPageID, hashCode, isLeafEntry

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface de.lmu.ifi.dbs.elki.index.tree.metrical.mtreevariants.MTreeEntry

getCoveringRadius, getParentDistance, getRoutingObjectID, setCoveringRadius, setParentDistance, setRoutingObjectID

Methods inherited from interface de.lmu.ifi.dbs.elki.index.tree.Entry

isLeafEntry

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

knnDistances

private double[] knnDistances

The aggregated knn distances of the underlying node.

Constructor Detail

MkTabDirectoryEntry

public MkTabDirectoryEntry()

Empty constructor for serialization purposes.

MkTabDirectoryEntry

public MkTabDirectoryEntry(DBID objectID,
                   double parentDistance,
                   Integer nodeID,
                   double coveringRadius,
                   double[] knnDistances)

Constructor.

Parameters:

objectID - the id of the routing object

parentDistance - the distance from the routing object of this entry to its parent's routing object

nodeID - the id of the underlying node

coveringRadius - the covering radius of the entry

knnDistances - the aggregated knn distances of the underlying node

Method Detail

getKnnDistances

public double[] getKnnDistances()

Description copied from interface: MkTabEntry

Returns the list of knn distances of the entry.

Specified by:

getKnnDistances in interface MkTabEntry

Returns:

the list of knn distances of the entry

setKnnDistances

public void setKnnDistances(double[] knnDistances)

Description copied from interface: MkTabEntry

Sets the knn distances of the entry.

Specified by:

setKnnDistances in interface MkTabEntry

Parameters:

knnDistances - the knn distances to be set

getKnnDistance

public double getKnnDistance(int k)

Description copied from interface: MkTabEntry

Returns the knn distance of the entry for the specified parameter k.

Specified by:

getKnnDistance in interface MkTabEntry

Parameters:

k - the parameter k of the knn distance

Returns:

the knn distance of the entry

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Calls the super method and writes the parameter k_max and the knn distances of this entry to the specified stream.

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class MTreeDirectoryEntry

Parameters:

out - the stream to write the object to

Throws:

IOException - Includes any I/O exceptions that may occur

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Calls the super method and reads the parameter k_max and knn distance of this entry from the specified input stream.

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class MTreeDirectoryEntry

Parameters:

in - the stream to read data from in order to restore the object

Throws:

IOException - if I/O errors occur

ClassNotFoundException - If the class for an object being restored cannot be found.

equals

public boolean equals(Object o)

Indicates whether some other object is "equal to" this one.

Overrides:

equals in class MTreeDirectoryEntry

Parameters:

o - the object to be tested

Returns:

true, if the super method returns true and o is an MkTabDirectoryEntry and has the same parameter k_max and knnDistances as this entry.