de.jaret.util.ui.table.model
Class AbstractColumn

java.lang.Object
  de.jaret.util.ui.table.model.AbstractColumn

All Implemented Interfaces:

IColumn, java.util.Comparator<IRow>

Direct Known Subclasses:

HierarchyColumn, IndexColumn, PropCol, SimpleColumn

public abstract class AbstractColumn
extends java.lang.Object
implements IColumn

Abstract base implemenation of an IColumn.

Version:

$Id: AbstractColumn.java 180 2007-01-07 18:44:01Z olk $

Author:

Peter Kliem

Field Summary

protected java.util.List<IColumnListener>

_listeners column listeners.

Constructor Summary

AbstractColumn()

Method Summary

void	addColumnListener(IColumnListener cl) Add a listener to listen on changes on the column.
boolean	displayHeader() Header display always defaults to true.
protected void	fireValueChanged(IRow row, IColumn column, java.lang.Object oldValue, java.lang.Object newValue) Inform listeners about a value change.
java.lang.Class<?>	getContentClass(IRow row) Default implementation: no difference to getContentClass().
boolean	isEditable() Deafult: cols are aditable.
boolean	isEditable(IRow row) Default: delegate to isEditable.
void	remColumnListener(IColumnListener cl) Remove a column listener.

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.jaret.util.ui.table.model.IColumn

getContentClass, getHeaderLabel, getId, getValue, setValue, supportsSorting

Methods inherited from interface java.util.Comparator

compare, equals

Field Detail

_listeners

protected java.util.List<IColumnListener> _listeners

column listeners.

Constructor Detail

AbstractColumn

public AbstractColumn()

Method Detail

fireValueChanged

protected void fireValueChanged(IRow row,
                                IColumn column,
                                java.lang.Object oldValue,
                                java.lang.Object newValue)

Inform listeners about a value change.

Parameters:

row - row

column - column

oldValue - old value

newValue - new value

addColumnListener

public void addColumnListener(IColumnListener cl)

Add a listener to listen on changes on the column.

Specified by:

addColumnListener in interface IColumn

Parameters:

cl - listener to add

remColumnListener

public void remColumnListener(IColumnListener cl)

Remove a column listener.

Specified by:

remColumnListener in interface IColumn

Parameters:

cl - listener to remove

getContentClass

public java.lang.Class<?> getContentClass(IRow row)

Default implementation: no difference to getContentClass(). To specify a content class per row this method may be implemented to reflect the appropriate class.

Specified by:

getContentClass in interface IColumn

Parameters:

row - row of which to get the content class

Returns:

contained class or null if the information is not available.

displayHeader

public boolean displayHeader()

Header display always defaults to true. Should return true for a header to be painted. Note that this ia a small violation of the separation between viewstate and data. However this can be tolerated.

Specified by:

displayHeader in interface IColumn

Returns:

true when a header should be painted

isEditable

public boolean isEditable()

Deafult: cols are aditable.

Specified by:

isEditable in interface IColumn

Returns:

true

isEditable

public boolean isEditable(IRow row)

Default: delegate to isEditable. Check whether a a specific cell of the column can be edited.

Specified by:

isEditable in interface IColumn

Parameters:

row - row specifying the cell in the column

Returns:

true if the ell can be changed