org.zkoss.zul
Class AbstractGroupsModel<D,H,F,E>

java.lang.Object
  org.zkoss.zul.AbstractGroupsModel<D,H,F,E>

All Implemented Interfaces:

Serializable, Selectable<E>, GroupsModel<D,H,F>

Direct Known Subclasses:

GroupsModelArray, SimpleGroupsModel

public abstract class AbstractGroupsModel<D,H,F,E>
extends Object
implements GroupsModel<D,H,F>, Selectable<E>, Serializable

A skeletal implementation for GroupsModel.

Implements Selectable interface to handle the selection status. (Since 6.0.0)

Generics:

D

The class of each data

H

The class of each group header

F

The class of each group footer

E

The class of each selection. It is the common base class of D, H, F. In other words, D, H and F must extend from E.

Since:

3.5.0

Author:

tomyeh

See Also:

Selectable, Serialized Form

Field Summary

protected Set<E>

_selection The current selection.

Constructor Summary

protected

AbstractGroupsModel()

Method Summary

void	addGroupsDataListener(GroupsDataListener l) Adds a listener to the groups that's notified each time a change to the data model occurs.
boolean	addToSelection(E obj) Add the specified object into selection.
void	clearSelection() Change the selection to the empty set.
Object	clone()
protected void	fireEvent(int type, int groupIndex, int index0, int index1) Fires a GroupsDataEvent for all registered listener (thru addGroupsDataListener(org.zkoss.zul.event.GroupsDataListener).
protected void	fireSelectionEvent(E e) Selectable's implementor use only.
Set<E>	getSelection() Returns the current selection.
boolean	isMultiple() Returns whether the current selection mode is multiple.
boolean	isSelected(Object obj) Returns whether an object is selected.
boolean	isSelectionEmpty() Returns true if the selection is currently empty.
protected Set<E>	newEmptySelection() Instantiation an empty set of the section.
protected void	readSelection(ObjectInputStream s) Reads back _selection.
protected void	removeAllSelection(Collection<?> c) Removes the selection of the given collection.
boolean	removeFromSelection(Object obj) Remove the specified object from selection.
void	removeGroupsDataListener(GroupsDataListener l) Removes a listener from the groups that's notified each time a change to the data model occurs.
protected void	retainAllSelection(Collection<?> c) Removes the selection that doesn't belong to the given collection.
void	setMultiple(boolean multiple) Sets the selection mode to be multiple.
void	setSelection(Collection<? extends E> selection) Replace the current selection with the given set.
protected void	writeSelection(ObjectOutputStream s) Writes _selection.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.zkoss.zul.GroupsModel

addOpenGroup, getChild, getChildCount, getGroup, getGroupCount, getGroupfoot, hasGroupfoot, isGroupOpened, removeOpenGroup

Field Detail

_selection

protected transient Set<E> _selection

The current selection.

Constructor Detail

AbstractGroupsModel

protected AbstractGroupsModel()

Method Detail

fireEvent

protected void fireEvent(int type,
                         int groupIndex,
                         int index0,
                         int index1)

Fires a GroupsDataEvent for all registered listener (thru addGroupsDataListener(org.zkoss.zul.event.GroupsDataListener).

Note: you can invoke this method only in an event listener.

addGroupsDataListener

public void addGroupsDataListener(GroupsDataListener l)

Description copied from interface: GroupsModel

Adds a listener to the groups that's notified each time a change to the data model occurs.

Specified by:

addGroupsDataListener in interface GroupsModel<D,H,F>

removeGroupsDataListener

public void removeGroupsDataListener(GroupsDataListener l)

Description copied from interface: GroupsModel

Removes a listener from the groups that's notified each time a change to the data model occurs.

Specified by:

removeGroupsDataListener in interface GroupsModel<D,H,F>

getSelection

public Set<E> getSelection()

Returns the current selection. It is readonly. Don't modify it directly

Specified by:

getSelection in interface Selectable<E>

Returns:

the current selection.

setSelection

public void setSelection(Collection<? extends E> selection)

Replace the current selection with the given set.

If this represents a change to the current selection then notify each ListDataListener, including UI.

Specified by:

setSelection in interface Selectable<E>

isSelected

public boolean isSelected(Object obj)

Returns whether an object is selected.

Specified by:

isSelected in interface Selectable<E>

isSelectionEmpty

public boolean isSelectionEmpty()

Returns true if the selection is currently empty.

Specified by:

isSelectionEmpty in interface Selectable<E>

addToSelection

public boolean addToSelection(E obj)

Add the specified object into selection.

If this represents a change to the current selection then notify each ListDataListener, including UI.

Specified by:

addToSelection in interface Selectable<E>

Parameters:

obj - the object to be as selection.

Returns:

true if it is added successfully; false if obj is not part of the data, or was already selected.

removeFromSelection

public boolean removeFromSelection(Object obj)

Remove the specified object from selection.

If this represents a change to the current selection then notify each ListDataListener, including UI.

Specified by:

removeFromSelection in interface Selectable<E>

Parameters:

obj - the object to be remove from selection.

Returns:

whether it is removed successfully

clearSelection

public void clearSelection()

Change the selection to the empty set.

If this represents a change to the current selection then notify each ListDataListener, including UI.

Specified by:

clearSelection in interface Selectable<E>

fireSelectionEvent

protected void fireSelectionEvent(E e)

Selectable's implementor use only.

Fires a selection event for component to scroll into view. The override subclass must put the index0 of fireEvent(int, int, int, int) as the view index to scroll. By default, the value -1 is assumed which means no scroll into view.

The method is invoked when both methods are invoked. addToSelection(Object) and setSelection(Collection).

Parameters:

e - selected object.

removeAllSelection

protected void removeAllSelection(Collection<?> c)

Removes the selection of the given collection.

retainAllSelection

protected void retainAllSelection(Collection<?> c)

Removes the selection that doesn't belong to the given collection.

isMultiple

public boolean isMultiple()

Returns whether the current selection mode is multiple.

Specified by:

isMultiple in interface Selectable<E>

See Also:

Selectable.setMultiple(boolean)

setMultiple

public void setMultiple(boolean multiple)

Sets the selection mode to be multiple.

Specified by:

setMultiple in interface Selectable<E>

newEmptySelection

protected Set<E> newEmptySelection()

Instantiation an empty set of the section. It is used to initialize _selection.

By default, it instantiates an instance of LinkedHashMap. The deriving class might override to instantiate a different class.

writeSelection

protected void writeSelection(ObjectOutputStream s)
                       throws IOException

Writes _selection.

Default: write it directly. Override it if E is not serializable.

Throws:

IOException

readSelection

protected void readSelection(ObjectInputStream s)
                      throws IOException,
                             ClassNotFoundException

Reads back _selection.

Default: write it directly. Override it if E is not serializable.

Throws:

IOException

ClassNotFoundException

clone

public Object clone()

Overrides:

clone in class Object