org.knime.core.data.def
Class FuzzyIntervalCell

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

All Implemented Interfaces:

Serializable, DataValue, FuzzyIntervalValue

public final class FuzzyIntervalCell
extends DataCell
implements FuzzyIntervalValue

A data cell implementation holding a fuzzy interval as value by storing this value in four private double members, two for the min/max values of the support, and two for the min/max values of the core of the fuzzy interval.

The height of the membership value in the core region 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.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(FuzzyIntervalCell.class).

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

UTILITY

Constructor Summary

FuzzyIntervalCell(double minSupp, double minCore, double maxCore, double maxSupp)
Creates a new fuzzy interval cell based on the min/max of support and of core.

Method Summary

protected boolean	equalsDataCell(DataCell dc) Derived classes implement their specific equals function here.
static org.knime.core.data.def.FuzzyIntervalCell.FuzzyIntervalSerializer	getCellSerializer() Returns the factory to read/write DataCells of this class from/to a DataInput/DataOutput.
double	getCenterOfGravity()
double	getMaxCore()
double	getMaxSupport()
double	getMinCore()
double	getMinSupport()
static Class<? extends DataValue>	getPreferredValueClass() Returns the preferred value class of this cell implementation.
int	hashCode() Computes hash code based on all private members.
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(FuzzyIntervalCell.class).

See Also:

DataType.getType(Class)

Constructor Detail

FuzzyIntervalCell

public FuzzyIntervalCell(double minSupp,
                         double minCore,
                         double maxCore,
                         double maxSupp)

Creates a new fuzzy interval cell based on the min/max of support and of core.

Parameters:

minSupp - Minimum support value.

minCore - Minimum core value.

maxCore - Maximum core value.

maxSupp - Maximum support value.

Throws:

IllegalArgumentException - If not a <= b <= c <= d.

Method Detail

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:

FuzzyIntervalValue.class

getCellSerializer

public static final org.knime.core.data.def.FuzzyIntervalCell.FuzzyIntervalSerializer 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

getMinSupport

public double getMinSupport()

Specified by:

getMinSupport in interface FuzzyIntervalValue

Returns:

Minimum support value.

getMinCore

public double getMinCore()

Specified by:

getMinCore in interface FuzzyIntervalValue

Returns:

Minimum core value.

getMaxCore

public double getMaxCore()

Specified by:

getMaxCore in interface FuzzyIntervalValue

Returns:

Maximum core value.

getMaxSupport

public double getMaxSupport()

Specified by:

getMaxSupport in interface FuzzyIntervalValue

Returns:

Maximum support value.

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 three areas (left triangle, core rectangle, right triangle) whereby the triangles' gravity point is 2/3 and 1/3 resp. is computed by the product of the gravity point and area for each interval. 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()

Computes hash code based on all private members. 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