com.mckoi.database

Class TNullType

java.lang.Object

com.mckoi.database.TType

com.mckoi.database.TNullType

All Implemented Interfaces:

Serializable

public class TNullType
extends TType

An implementation of TType that represents a NULL type. A Null type is an object that can't be anything else except null.

Author:

Tobias Downer

See Also:

Serialized Form

Field Summary

Fields inherited from class com.mckoi.database.TType

ARRAY_TYPE, BINARY_TYPE, BOOLEAN_TYPE, DATE_TYPE, NULL_TYPE, NUMERIC_TYPE, QUERY_PLAN_TYPE, STRING_TYPE

Constructor Summary

Constructors

Constructor and Description
TNullType() Constructs the type.

Method Summary

Modifier and Type	Method and Description
int	calculateApproximateMemoryUse(Object ob) Calculates the approximate memory usage of an object of this type in bytes.
boolean	comparableTypes(TType type) Returns true if the type of this object is logically comparable to the type of the given object.
int	compareObs(Object ob1, Object ob2) Compares two objects that are logically comparable under this type.
Class	javaClass() Returns the Java Class that is used to represent this type of object.

Methods inherited from class com.mckoi.database.TType

asEncodedString, asEncodedString, asSQLString, binaryType, booleanType, castObjectToTType, dateType, decodeString, decodeTypes, fromClass, getSQLType, getWidestType, javaObjectType, numericType, stringType

Methods inherited from class java.lang.Object

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

Constructor Detail

TNullType

public TNullType()

Constructs the type.

Method Detail

comparableTypes

public boolean comparableTypes(TType type)

Description copied from class: TType

Returns true if the type of this object is logically comparable to the type of the given object. For example, VARCHAR and LONGVARCHAR are comparable types. DOUBLE and FLOAT are comparable types. DOUBLE and VARCHAR are not comparable types.

Specified by:

comparableTypes in class TType

compareObs

public int compareObs(Object ob1,
                      Object ob2)

Description copied from class: TType

Compares two objects that are logically comparable under this type. Returns 0 if the values are equal, >1 if ob1 is greater than ob2, and <1 if ob1 is less than ob2. It is illegal to pass NULL values for ob1 or ob2 into this method.

Specified by:

compareObs in class TType

calculateApproximateMemoryUse

public int calculateApproximateMemoryUse(Object ob)

Description copied from class: TType

Calculates the approximate memory usage of an object of this type in bytes.

Specified by:

calculateApproximateMemoryUse in class TType

javaClass

public Class javaClass()

Description copied from class: TType

Returns the Java Class that is used to represent this type of object. For example, string types would return String.class.

Specified by:

javaClass in class TType