org.mmbase.datatypes
Interface SequentialDataType<E extends Comparable>

All Superinterfaces:

Comparable<DataType<E>>, DataType<E>, Descriptor, Serializable

All Known Implementing Classes:

Duration.DataType, IntegerDataType, LongDataType, WeekdaysDataType

public interface SequentialDataType<E extends Comparable>
extends DataType<E>

A sequential datatype is a datatype of which the values are 'sequential', i.e. every value has a well defined previous and next value.

Since:

MMBase-2.0

Version:

$Id: SequentialDataType.java 41983 2010-04-20 15:27:34Z michiel $

Author:

Michiel Meeuwissen

Nested Class Summary

Nested classes/interfaces inherited from interface org.mmbase.datatypes.DataType

DataType.Restriction<D extends Serializable>

Field Summary

Fields inherited from interface org.mmbase.datatypes.DataType

ENFORCE_ABSOLUTE, ENFORCE_ALWAYS, ENFORCE_NEVER, ENFORCE_ONCHANGE, ENFORCE_ONCREATE, ENFORCE_ONVALIDATE, PROCESS_GET, PROCESS_SET, VALID, XMLNS

Method Summary

E	decrease(E pos) Given a certain value, returns the value with is 1 smaller.
E	first() Returns a natural 'first' value.
E	increase(E pos) Given a certain value, returns the value with is 1 bigger.

Methods inherited from interface org.mmbase.datatypes.DataType

cast, castAndValidate, castForSearch, castOrException, checkType, clone, clone, finish, getBaseType, getBaseTypeIdentifier, getCommitProcessor, getDefaultValue, getDefaultValue, getDeleteProcessor, getEnforceStrength, getEnumerationFactory, getEnumerationRestriction, getEnumerationValue, getEnumerationValues, getHandler, getHandlers, getOrigin, getProcessor, getProcessor, getRequiredRestriction, getStyleClasses, getTypeAsClass, getUniqueRestriction, isFinished, isRequired, isUnique, preCast, rewrite, setCommitProcessor, setDefaultValue, setProcessor, setProcessor, setRequired, setUnique, toXml, toXml, validate, validate

Methods inherited from interface org.mmbase.bridge.Descriptor

getDescription, getDescription, getGUIName, getGUIName, getLocalizedDescription, getLocalizedGUIName, getName, setDescription, setDescription, setGUIName, setGUIName

Methods inherited from interface java.lang.Comparable

compareTo

Method Detail

increase

E increase(E pos)

Given a certain value, returns the value with is 1 bigger. It can return null if there is no such value (and the given value is the biggest one possible)

decrease

E decrease(E pos)

Given a certain value, returns the value with is 1 smaller. It can return null if there is no such value (and the given value is the smallest one possible)

first

E first()

Returns a natural 'first' value. This may return some kind of 0

Since:

MMBase-2.0