org.mmbase.storage.util
Class TypeMapping

java.lang.Object
  org.mmbase.storage.util.TypeMapping

All Implemented Interfaces:

Comparable

public class TypeMapping

extends Object

implements Comparable

The TypeMapping class helps translating MMBase types to storage-specific type descriptions. Examples of type mappings are mappings that convert to database field types. I.e., a STRING with size 0-255 could be configured to translate to 'varchar({0})', '{0}, in this case,. being the size of the actual field.
TypeMapping is a comparable class, which allows it to be used in a sorted map, set or list. However, Typemapping needs fuzzy matching so it is easy to locate the appropriate type-mapping for a field. As such, it's natural ordering is NOT consistent with equals. A typemapping may be considered 'equal' while still having a different ordering position in the class. This allows for an easy search on a sorted list of TypeMappings: By using 'IndexOf' you can quickly find a TypeMapping in a list, even if the min or max sizes for the type do not completely match. You typically use this if you searxh for a TypeMapping whose size you set with 'getSize()', rather than setting a specific range (using the minSize/maxSize properties).

Since:

MMBase-1.7

Version:

$Id: TypeMapping.java,v 1.5 2005/01/30 16:46:35 nico Exp $

Author:

Pierre van Rooden

Field Summary

int	maxSize The maximum size of the MMBase type to map.
int	minSize The minimum size of the MMBase type to map.
String	name The name of the MMBase type to map
String	type The expression this type should translate to.

Constructor Summary

TypeMapping()

Method Summary

int	compareTo(Object o)
boolean	equals(Object o)
String	getType(int size) Returns the mappings type.
int	hashCode()
void	setFixedSize(int size) Sets a fixed size for this TypeMapping.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

type

public String type

The expression this type should translate to. You can access this property directly, but you can use getType(int) to obtain an expanded expression.

name

public String name

The name of the MMBase type to map

minSize

public int minSize

The minimum size of the MMBase type to map. A value of -1 indicates no mimimum.

maxSize

public int maxSize

The maximum size of the MMBase type to map. A value of -1 indicates no maximum.

Constructor Detail

TypeMapping

public TypeMapping()

Method Detail

setFixedSize

public void setFixedSize(int size)

Sets a fixed size for this TypeMapping. Effectively, this sets the minimimum and maximum size of the type mapping to the specified value, ensuring this TypeMapping object is equal to all TypeMappings whos minimum size is equal to or smaller than the size, and teh maximum size is equal to or greater that this size.

Parameters:

size - the size to set

compareTo

public int compareTo(Object o)

Specified by:

compareTo in interface Comparable

equals

public boolean equals(Object o)

hashCode

public int hashCode()

getType

public String getType(int size)

Returns the mappings type.

toString

public String toString()