p:Column composite element wont export in p:DataExporter - jsf-2

Question

I am facing a problem when trying to export a DataTable with some columns, both the DataTable and the Column components are composite elements, like this:
Custom dataTable XHTML (v:dataTable):
<cc:interface>
<cc:attribute name="value" required="true" />
<cc:attribute name="selectionMode" default="multiple" />
<cc:attribute name="selectionBean" />
<cc:attribute name="selectionProperty" />
<cc:facet name="header" />
</cc:interface>
<cc:implementation>
<p:dataTable id="teste" var="tableItem" value="#{cc.attrs.value}"
selection="#{cc.attrs.selectionBean[cc.attrs.selectionProperty]}"
rowKey="#{tableItem.id}" rowsPerPageTemplate="15, 30, 45"
paginator="true" rows="15"
emptyMessage="#{messages['dataTable.emptyMessage']}">
<cc:insertChildren />
<f:facet name="footer">
<p:commandButton value="#{messages['dataTable.exportExcel']}"
ajax="false">
<p:dataExporter type="xls" target="teste" fileName="export" />
</p:commandButton>`enter code here`
</f:facet>
</p:dataTable>
</cc:implementation>
Custom column XHTML (v:dataColumn):
<cc:interface
componentType="com.example.VDataColumn">
<cc:attribute name="value" />
</cc:interface>
<cc:implementation>
<c:choose>
<c:when test="#{cc.childCount gt 0}">
<cc:insertChildren />
</c:when>
<c:otherwise>
<h:outputText value="#{cc.attrs.value}" />
</c:otherwise>
</c:choose>
</cc:implementation>
The Column component is an extension of the org.primefaces.component.column.Column class:
package com.example.component;
import javax.faces.component.FacesComponent;
import javax.faces.component.NamingContainer;
import javax.faces.component.UINamingContainer;
import org.primefaces.component.column.Column;
#FacesComponent("com.example.VDataColumn")
public class VDataColumn extends Column implements NamingContainer {
#Override
public String getFamily() {
return UINamingContainer.COMPONENT_FAMILY;
}
}
The DataTable and Column are used as it follows:
<v:dataTable
value="#{testController.resultList}"
selectionBean="#{testController}"
selectionProperty="selectedList" selectionMode="multiple">
<p:column value="#{tableItem.id}" headerText="ID" />
<v:dataColumn value="#{tableItem.code}" headerText="Code" />
<v:dataColumn value="#{tableItem.nome}" headerText="Name" />
<v:dataColumn value="#{tableItem.desc}" headerText="Desc" />
</v:dataTable>
When I try to export the dataTable with the dataExporter that is inside the component, I get just one column in the XLS file, and it is only the p:column.
Debugging the primefaces DataExporter class, i noticed that the DataTable object contains 4 objects in the getChildren() method, one Column and 3 VDataColumn's, and only the Column object contains children itself.
Did anybody have the same issue? I am using Primefaces 4.0

Answer 1

I had same problem with a custom component. We resolve by extending the exporter and using custom validation for the component.
if (component instanceof UINamingContainer) {
UINamingContainer uiNamingContainer = (UINamingContainer) component;
UIComponent panel = uiNamingContainer.getFacet(UIComponent.COMPOSITE_FACET_NAME);
Collection<UIComponent> children = panel.getChildren();
for (UIComponent uiComponent : children) {
if (uiComponent instanceof javax.faces.component.html.HtmlOutputText) {
try {
uiNamingContainer.encodeBegin(context);
return super.exportValue(context, uiComponent);
} catch (IOException e) {
LOGGER.error(e);
} finally {
try {
uiNamingContainer.encodeEnd(context);
} catch (IOException e) {
LOGGER.error(e);
}
}
}
}
}