org.knime.core.data.def
Class FuzzyNumberCell

java.lang.Object
  org.knime.core.data.DataCell
      org.knime.core.data.def.FuzzyNumberCell

All Implemented Interfaces:

Serializable, DataValue, FuzzyIntervalValue, FuzzyNumberValue

public final class FuzzyNumberCell
extends DataCell
implements FuzzyNumberValue, FuzzyIntervalValue

A data cell implementation holding a Fuzzy number by storing this value in three private double members, that is one for the core and two for the min/max of the support. It also provides a fuzzy interval value.

The height of the membership value at the core value is assumed to be 1.

Author:

Michael Berthold, University of Konstanz

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.knime.core.data.FuzzyNumberValue

FuzzyNumberValue.FuzzyNumberUtilityFactory

Nested classes/interfaces inherited from interface org.knime.core.data.FuzzyIntervalValue

FuzzyIntervalValue.FuzzyIntervalUtilityFactory

Nested classes/interfaces inherited from interface org.knime.core.data.DataValue

DataValue.UtilityFactory

Field Summary

static DataType

TYPE Convenience access member for DataType.getType(FuzzyNumberCell.class).

Fields inherited from interface org.knime.core.data.FuzzyNumberValue

UTILITY

Fields inherited from interface org.knime.core.data.FuzzyIntervalValue

UTILITY

Constructor Summary

FuzzyNumberCell(double minSupp, double core, double maxSupp)
Creates a new fuzzy number cell based on min, max support, and core.

Method Summary

protected boolean	equalsDataCell(DataCell dc) Derived classes implement their specific equals function here.
static org.knime.core.data.def.FuzzyNumberCell.FuzzyNumberSerializer	getCellSerializer() Returns the factory to read/write DataCells of this class from/to a DataInput/DataOutput.
double	getCenterOfGravity()
double	getCore()
double	getMaxCore()
double	getMaxSupport()
double	getMinCore()
double	getMinSupport()
static Class<? extends DataValue>	getPreferredValueClass() Returns the preferred value class of this cell implementation.
int	hashCode() This method must be implemented in order to ensure that two equal DataCell objects return the same hash code.
String	toString() Returns the String representation of this cell's value.

Methods inherited from class org.knime.core.data.DataCell

equals, getType, isMissing

Methods inherited from class java.lang.Object

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

Field Detail

TYPE

public static final DataType TYPE

Convenience access member for DataType.getType(FuzzyNumberCell.class).

See Also:

DataType.getType(Class)

Constructor Detail

FuzzyNumberCell

public FuzzyNumberCell(double minSupp,
                       double core,
                       double maxSupp)

Creates a new fuzzy number cell based on min, max support, and core.

Parameters:

minSupp - Minimum support value.

core - Core value.

maxSupp - Maximum support value.

Throws:

IllegalArgumentException - If not minSupp <= core <= maxSupp.

Method Detail

getCellSerializer

public static final org.knime.core.data.def.FuzzyNumberCell.FuzzyNumberSerializer getCellSerializer()

Returns the factory to read/write DataCells of this class from/to a DataInput/DataOutput. This method is called via reflection.

Returns:

A serializer for reading/writing cells of this kind.

See Also:

DataCell

getPreferredValueClass

public static final Class<? extends DataValue> getPreferredValueClass()

Returns the preferred value class of this cell implementation. This method is called per reflection to determine which is the preferred renderer, comparator, etc.

Returns:

FuzzyNumberValue.class;

getMinSupport

public double getMinSupport()

Specified by:

getMinSupport in interface FuzzyIntervalValue

Specified by:

getMinSupport in interface FuzzyNumberValue

Returns:

Minimum support value.

getCore

public double getCore()

Specified by:

getCore in interface FuzzyNumberValue

Returns:

Core value.

getMaxSupport

public double getMaxSupport()

Specified by:

getMaxSupport in interface FuzzyIntervalValue

Specified by:

getMaxSupport in interface FuzzyNumberValue

Returns:

Maximum support value.

getMinCore

public double getMinCore()

Specified by:

getMinCore in interface FuzzyIntervalValue

Returns:

#getCore()

getMaxCore

public double getMaxCore()

Specified by:

getMaxCore in interface FuzzyIntervalValue

Returns:

#getCore()

getCenterOfGravity

public double getCenterOfGravity()

Specified by:

getCenterOfGravity in interface FuzzyIntervalValue

Returns:

The center of gravity of this trapezoid membership function which are the weighted (by the area) gravities of each of the two areas (left triangle, right triangle). This value is divided by the overall membership function volume.

equalsDataCell

protected boolean equalsDataCell(DataCell dc)

Derived classes implement their specific equals function here. The argument is guaranteed to be not null or a missing value, to be of the same class like this.

Specified by:

equalsDataCell in class DataCell

Parameters:

dc - the cell to compare this to

Returns:

true if this is equal to the argument, false if not

hashCode

public int hashCode()

This method must be implemented in order to ensure that two equal DataCell objects return the same hash code.

Specified by:

hashCode in class DataCell

Returns:

the hash code of your specific DataCell

See Also:

Object.hashCode(), DataCell.equals(java.lang.Object)

toString

public String toString()

Returns the String representation of this cell's value.

Specified by:

toString in class DataCell

Returns:

a String representation of this cell's value