Adding the ability of a TableDecorator to decorate all cells in a row using a
single method
-------------------------------------------------------------------------------------------
Key: DISPL-302
URL: http://jira.codehaus.org/browse/DISPL-302
Project: DisplayTag
Type: Improvement
Components: Decorators
Versions: 1.1
Reporter: Eric Taix
Attachments: Column.java, TableDecorator.java
I wanted my TableDecorator to be able to decorate all cells in a row in a
single method (adding the same link for all cells) - I did'nt want to override
all properties of my bean which is a bad idea because you have to change your
decorator each time your add (or remove) a property whereas
So i added 2 methods in TableDecorator:
public Object startCell(String propertyName)
public Object endCell(String propertyName)
By default these methods return null in abstract TableDecorator class.
And I modified Column model like this :
public Object getValue(boolean decorated) throws ObjectLookupException,
DecoratorException
{
TableDecorator tableDecorator =
this.row.getParentTable().getTableDecorator();
// Patch (Eric Taix): Get the table decorator if exist and get the start
of cell object
Object start = "";
if (tableDecorator != null) {
if (this.header.getBeanPropertyName() != null) {
Object objStart =
tableDecorator.startCell(this.header.getBeanPropertyName());
start = (objStart != null ? objStart : "");
}
}
Object object = null;
// a static value has been set?
if (this.cell.getStaticValue() != null)
{
object = this.cell.getStaticValue();
}
else if (this.header.getBeanPropertyName() != null)
{
// if a decorator has been set, and if decorator has a getter for
the requested property only, check
// decorator
if (decorated
&& this.row.getParentTable().getTableDecorator() != null
&&
this.row.getParentTable().getTableDecorator().hasGetterFor(this.header.getBeanPropertyName()))
{
object = LookupUtil.getBeanProperty(tableDecorator, this.header
.getBeanPropertyName());
}
else
{
// else check underlining object
object = LookupUtil.getBeanProperty(this.row.getObject(),
this.header.getBeanPropertyName());
}
}
DisplaytagColumnDecorator[] decorators =
this.header.getColumnDecorators();
if (decorated)
{
for (int j = 0; j < decorators.length; j++)
{
object = decorators[j].decorate(object,
row.getParentTable().getPageContext(), row
.getParentTable()
.getMedia());
}
}
if (object == null || "null".equals(object)) //$NON-NLS-1$
{
if (!this.header.getShowNulls())
{
object = TagConstants.EMPTY_STRING;
}
}
// Patch (Eric Taix) : Get the table decorator if exist and get the end
of cell object
Object end = "";
if (tableDecorator != null) {
if (this.header.getBeanPropertyName() != null) {
Object objEnd =
tableDecorator.endCell(this.header.getBeanPropertyName());
end = (objEnd != null ? objEnd : "");
}
}
StringBuffer result = new StringBuffer();
result.append(ObjectUtils.toString(start));
result.append(ObjectUtils.toString(object));
result.append(ObjectUtils.toString(end));
return result;
}
I think it's a good improvement, because it give us the ability to decorate
cells without implementing a getter for each properties.
In attached files, you'll find TableDecorator and Colum modified classes.
Hope it help community
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