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PrimeFaces is one of the most popular UI libraries in Java EE Ecosystem and widely used by software companies, world renowned brands, banks, financial institutions, insurance companies, universities and more.
/**
* Copyright 2009-2018 PrimeTek.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.primefaces.component.datatable.feature;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.logging.Logger;
import javax.el.MethodExpression;
import javax.faces.context.FacesContext;
import org.primefaces.component.datatable.DataTable;
import org.primefaces.component.datatable.DataTableRenderer;
public class DraggableRowsFeature implements DataTableFeature {
private static final Logger LOGGER = Logger.getLogger(DraggableRowsFeature.class.getName());
@Override
public boolean shouldDecode(FacesContext context, DataTable table) {
return context.getExternalContext().getRequestParameterMap().containsKey(table.getClientId(context) + "_rowreorder");
}
@Override
public boolean shouldEncode(FacesContext context, DataTable table) {
return false;
}
@Override
public void decode(FacesContext context, DataTable table) {
MethodExpression me = table.getDraggableRowsFunction();
if (me != null) {
me.invoke(context.getELContext(), new Object[]{table});
}
else {
Map params = context.getExternalContext().getRequestParameterMap();
String clientId = table.getClientId(context);
int fromIndex = Integer.parseInt(params.get(clientId + "_fromIndex"));
int toIndex = Integer.parseInt(params.get(clientId + "_toIndex"));
table.setRowIndex(fromIndex);
Object rowData = table.getRowData();
Object value = table.getValue();
if (value instanceof List) {
List list = (List) value;
if (toIndex >= fromIndex) {
Collections.rotate(list.subList(fromIndex, toIndex + 1), -1);
}
else {
Collections.rotate(list.subList(toIndex, fromIndex + 1), 1);
}
}
else {
LOGGER.info("Row reordering is only available for list backed datatables, "
+ "use rowReorder ajax behavior with listener for manual handling of model update.");
}
}
}
@Override
public void encode(FacesContext context, DataTableRenderer renderer, DataTable table) throws IOException {
throw new RuntimeException("DraggableRows Feature should not encode.");
}
}