package org.jboss.seam.excel.ui;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.faces.context.FacesContext;
import org.jboss.seam.excel.ExcelWorkbook;
import org.jboss.seam.excel.ExcelWorkbookException;
import org.jboss.seam.excel.WorksheetItem;
import org.jboss.seam.excel.ui.command.Command;
public class UIColumn extends ExcelComponent
{
public static final String COMPONENT_TYPE = "org.jboss.seam.excel.ui.UIColumn";
public static final String HEADER_FACET_NAME = "header";
private static final String FOOTER_FACET_NAME = "footer";
@Override
public String getFamily()
{
return COMPONENT_TYPE;
}
@SuppressWarnings("unchecked")
@Override
public void encodeBegin(FacesContext facesContext) throws IOException
{
// Get workbook and worksheet
ExcelWorkbook excelWorkbook = getWorkbook(getParent());
if (excelWorkbook == null)
{
throw new ExcelWorkbookException("Could not find excel workbook");
}
// Column width etc.
excelWorkbook.applyColumnSettings(this);
UIWorksheet sheet = (UIWorksheet) getParentByClass(getParent(), UIWorksheet.class);
if (sheet == null)
{
throw new ExcelWorkbookException("Could not find worksheet");
}
// Add header items (if any)
WorksheetItem headerItem = (WorksheetItem) getFacet(HEADER_FACET_NAME);
if (headerItem != null)
{
excelWorkbook.addItem(headerItem);
}
// Execute commands (if any)
List<Command> commands = getCommands(getChildren());
for (Command command : commands)
{
excelWorkbook.executeCommand(command);
}
// Get UiCell template this column's data cells and iterate over sheet data
for (WorksheetItem item : getItems(getChildren()))
{
Object oldValue = null;
Iterator iterator = null;
// Store away the old value for the sheet binding var (if there is one)
if (sheet.getVar() != null) {
oldValue = FacesContext.getCurrentInstance().getExternalContext().getRequestMap().get(sheet.getVar());
iterator = sheet.getDataIterator();
} else {
// No var, no iteration...
iterator = new ArrayList().iterator();
}
while (iterator.hasNext())
{
// Store the bound data in the request map and add the cell
FacesContext.getCurrentInstance().getExternalContext().getRequestMap().put(sheet.getVar(), iterator.next());
excelWorkbook.addItem(item);
}
// No iteration, nothing to restore
if (sheet.getVar() == null) {
continue;
}
// Restore the previously modified request map (if there was a var)
if (oldValue == null)
{
FacesContext.getCurrentInstance().getExternalContext().getRequestMap().remove(sheet.getVar());
}
else
{
FacesContext.getCurrentInstance().getExternalContext().getRequestMap().put(sheet.getVar(), oldValue);
}
}
// Add footer items (if any)
WorksheetItem footerItem = (WorksheetItem) getFacet(FOOTER_FACET_NAME);
if (footerItem != null)
{
excelWorkbook.addItem(footerItem);
}
// Move column pointer to next column
excelWorkbook.nextColumn();
}
}