com.jidesoft.grouper
Class ObjectGrouperManager

java.lang.Object
  com.jidesoft.grouper.ObjectGrouperManager

public class ObjectGrouperManager
extends Object

A global object that can register Object Grouper with a type and a GrouperContext.

Constructor Summary

ObjectGrouperManager()

Method Summary

static void	addRegistrationListener(RegistrationListener l) Adds a listener to the list that's notified each time a change to the manager occurs.
static void	clear()
static ObjectGrouper	getGrouper(Class<?> clazz) Gets the grouper associated with the type.
static ObjectGrouper	getGrouper(Class<?> clazz, GrouperContext context) Gets the registered grouper associated with class and context.
static GrouperContext[]	getGrouperContexts(Class<?> clazz) Gets the available GrouperContexts registered with the class.
static Object	getGroupValue(Object object) Converts an object to string using default grouper context.
static Object	getGroupValue(Object object, Class<?> clazz) Converts an object to string using default grouper context.
static Object	getGroupValue(Object object, Class<?> clazz, GrouperContext context) Converts an object to string using grouper context specified.
static RegistrationListener[]	getRegistrationListeners() Returns an array of all the registration listeners registered on this manager.
static void	initDefaultGrouper() Initialize default groupers.
static boolean	isAutoInit() Checks the value of autoInit.
static void	registerGrouper(Class<?> clazz, ObjectGrouper grouper) Registers a grouper with type specified as clazz.
static void	registerGrouper(Class<?> clazz, ObjectGrouper grouper, GrouperContext context) Registers a grouper with the type specified as class and a grouper context specified as context.
static void	removeRegistrationListener(RegistrationListener l) Removes a listener from the list that's notified each time a change to the manager occurs.
static void	resetInit() If initDefaultGrouper() is called once, calling it again will have no effect because an internal flag is set.
static void	setAutoInit(boolean autoInit) Sets autoInit to true or false.
static void	unregisterAllGroupers() Unregisters all the groupers which registered before.
static void	unregisterAllGroupers(Class<?> clazz) Unregisters all groupers associated with clazz.
static void	unregisterGrouper(Class<?> clazz) Unregisters grouper associated with clazz.
static void	unregisterGrouper(Class<?> clazz, GrouperContext context) Unregisters grouper associated with clazz and context.

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectGrouperManager

public ObjectGrouperManager()

Method Detail

registerGrouper

public static void registerGrouper(Class<?> clazz,
                                   ObjectGrouper grouper,
                                   GrouperContext context)

Registers a grouper with the type specified as class and a grouper context specified as context.

Parameters:

clazz - type

grouper - group to be registered

context - the grouper context.

registerGrouper

public static void registerGrouper(Class<?> clazz,
                                   ObjectGrouper grouper)

Registers a grouper with type specified as clazz.

Parameters:

clazz - the data type.

grouper - the grouper to be registered

unregisterGrouper

public static void unregisterGrouper(Class<?> clazz,
                                     GrouperContext context)

Unregisters grouper associated with clazz and context.

Parameters:

clazz - the data type.

context - the grouper context.

unregisterGrouper

public static void unregisterGrouper(Class<?> clazz)

Unregisters grouper associated with clazz.

Parameters:

clazz - the data type.

unregisterAllGroupers

public static void unregisterAllGroupers(Class<?> clazz)

Unregisters all groupers associated with clazz.

Parameters:

clazz - the data type.

unregisterAllGroupers

public static void unregisterAllGroupers()

Unregisters all the groupers which registered before.

getGrouper

public static ObjectGrouper getGrouper(Class<?> clazz,
                                       GrouperContext context)

Gets the registered grouper associated with class and context.

Parameters:

clazz - the data type.

context - the grouper context.

Returns:

the registered grouper. It could return null if there is no grouper for the type and the context.

getGrouper

public static ObjectGrouper getGrouper(Class<?> clazz)

Gets the grouper associated with the type.

Parameters:

clazz - the data type.

Returns:

the grouper. It could return null if there is no grouper for the type.

getGroupValue

public static Object getGroupValue(Object object)

Converts an object to string using default grouper context.

Parameters:

object - object to be converted.

Returns:

the string

getGroupValue

public static Object getGroupValue(Object object,
                                   Class<?> clazz)

Converts an object to string using default grouper context.

Parameters:

object - object to be converted.

clazz - type of the object

Returns:

the string

getGroupValue

public static Object getGroupValue(Object object,
                                   Class<?> clazz,
                                   GrouperContext context)

Converts an object to string using grouper context specified.

Parameters:

object - object to be converted.

clazz - type of the object

context - group context

Returns:

the string converted from object

isAutoInit

public static boolean isAutoInit()

Checks the value of autoInit.

Returns:

true or false.

See Also:

setAutoInit(boolean)

setAutoInit

public static void setAutoInit(boolean autoInit)

Sets autoInit to true or false. If autoInit is true, whenever someone tries to call methods getValue, initDefaultGrouper() will be called if it has never be called. By default, autoInit is true.

This might affect the behavior if users provide their own groupers and want to overwrite default groupers. In this case, instead of depending on autoInit to initialize default groupers, you should call initDefaultGrouper() first, then call registerGrouper to add your own groupers.

Parameters:

autoInit - false if you want to disable autoInit which means you either don't want those default comparators registered or you will call initDefaultGrouper() yourself.

addRegistrationListener

public static void addRegistrationListener(RegistrationListener l)

Adds a listener to the list that's notified each time a change to the manager occurs.

Parameters:

l - the RegistrationListener

removeRegistrationListener

public static void removeRegistrationListener(RegistrationListener l)

Removes a listener from the list that's notified each time a change to the manager occurs.

Parameters:

l - the RegistrationListener

getRegistrationListeners

public static RegistrationListener[] getRegistrationListeners()

Returns an array of all the registration listeners registered on this manager.

Returns:

all of this registration's RegistrationListeners or an empty array if no registration listeners are currently registered

See Also:

addRegistrationListener(com.jidesoft.utils.RegistrationListener), removeRegistrationListener(com.jidesoft.utils.RegistrationListener)

getGrouperContexts

public static GrouperContext[] getGrouperContexts(Class<?> clazz)

Gets the available GrouperContexts registered with the class.

Parameters:

clazz - the class.

Returns:

the available GrouperContexts.

initDefaultGrouper

public static void initDefaultGrouper()

Initialize default groupers. Please make sure you call this method before you use any group related classes. By default we register following groupers.

   DateYearGrouper dateYearGrouper = new DateYearGrouper();
   registerGrouper(Date.class, dateYearGrouper, DateYearGrouper.CONTEXT);
   registerGrouper(Calendar.class, dateYearGrouper, DateYearGrouper.CONTEXT);
   registerGrouper(Long.class, dateYearGrouper, DateYearGrouper.CONTEXT);
   DateMonthGrouper dateMonthGrouper = new DateMonthGrouper();
   registerGrouper(Date.class, dateMonthGrouper, DateMonthGrouper.CONTEXT);
   registerGrouper(Calendar.class, dateMonthGrouper, DateMonthGrouper.CONTEXT);
   registerGrouper(Long.class, dateMonthGrouper, DateMonthGrouper.CONTEXT);
 

resetInit

public static void resetInit()

If initDefaultGrouper() is called once, calling it again will have no effect because an internal flag is set. This method will reset the internal flag so that you can call initDefaultGrouper() in case you unregister all groupers using unregisterAllGroupers().

clear

public static void clear()