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https://jira.codehaus.org/browse/DISPL-550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=287921#comment-287921
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Pietro Martinelli commented on DISPL-550:
-----------------------------------------
What about resolving this issue by changing DisplaytagColumnDecorator.decorate
method's signature?
Something like
public Object decorate(Object columnValue, Object currentRowObject, PageContext
pageContext, MediaTypeEnum media) ?
This manner column decorators can access current row object and displaytag
internal data structure's lifecycle can remain unchanged.
But column decorators are used for totals cell formatting, too: it may look
ugly pass currentRowObject == null when decorating header/footer cells. An
alternative solution may consist in adding two methods to
DisplaytagColumnDecorator interface:
public Object decorate(Object columnValue, Object currentRowObject, PageContext
pageContext, MediaTypeEnum media)
public Object decorateTotals/Headers(Object columnValue, PageContext
pageContext, MediaTypeEnum media)
A further alternative would be to pass to decorate method something like
DecorableCell interface:
public interface DecorableCell {
Object getCellValue();
Integer getIterationIndex();
Object getCurrentRowObject();
boolean isBodyCell();
}
I've developed a solution hypotesis following the first proposal and it seems
work fine.
> uid always returns the same object in column decorators
> -------------------------------------------------------
>
> Key: DISPL-550
> URL: https://jira.codehaus.org/browse/DISPL-550
> Project: DisplayTag
> Issue Type: Bug
> Components: Decorators
> Affects Versions: 1.1.1
> Reporter: Thomas Queste
> Priority: Critical
> Fix For: 1.3
>
>
> Using the uid property of the table tag ("<display:table uid="row">") does
> not set the current row object in the page scope. It just put the last table
> row in pageScope.
> Here is an extract of the org.displaytag.tags.TableTag.doIteration() on line
> 784 :
> if (this.tableIterator.hasNext())
> {
> Object iteratedObject = this.tableIterator.next();
> [...]
> this.pageContext.setAttribute(getUid(), iteratedObject);
> So when the JSP is rendered, the iterator is called. For each table line, the
> iteratedObject overwrites the previous row. Then, after all row have been
> read, the column decorators are called. So If a decorator need the current
> row object, accessed using the provided pageContext, it will only find the
> last row object.
> The Javadoc for "uid" is : "The object representing the current row is also
> added to the pageContext under this name and the current row number is added
> using the key uid_rowNum." So in a column decorator, using pageContext, we
> can presume to have access to the current row object. This is not the case :
> the last table row is the only object in pageScope.
> Example of a column decorator which does not have access to its current row
> object :
> public class WorkflowStepColumnDecorator implements DisplaytagColumnDecorator
> {
> public Object decorate(Object columnValue, PageContext pageContext,
> MediaTypeEnum media) throws DecoratorException {
> Object row = pageContext.getAttribute("row");
> // row is not the current row, it is the last table's row
> }
> }
> JSP code :
> <display:table uid="row" name="users">
> <display:column decorator="example.MyColumnDecorator "/>
> </display:table>
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