/* ListboxSelectedItemsConverter.java
Purpose:
Description:
History:
Aug 17, 2011 6:10:20 PM, Created by henrichen
Copyright (C) 2011 Potix Corporation. All Rights Reserved.
*/
package org.zkoss.bind.converter.sys;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
import org.zkoss.bind.BindContext;
import org.zkoss.bind.Converter;
import org.zkoss.lang.Classes;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.UiException;
import org.zkoss.zul.ListModel;
import org.zkoss.zul.Listbox;
import org.zkoss.zul.Listitem;
import org.zkoss.zul.ext.Selectable;
/**
* Convert listbox selected listitems to bean and vice versa.
* @author dennis
* @since 6.0.0
*/
public class ListboxSelectedItemsConverter implements Converter, java.io.Serializable {
private static final long serialVersionUID = 201108171811L;
@SuppressWarnings("unchecked")
public Object coerceToUi(Object val, Component comp, BindContext ctx) {
Listbox lbx = (Listbox) comp;
final ListModel<?> model = lbx.getModel();
if (model != null && !(model instanceof Selectable)) {
//model has to implement Selectable if binding to selectedItems
throw new UiException("model doesn't implement Selectable");
}
final Set<Listitem> items = new LinkedHashSet<Listitem>();
Set<Object> vals = val == null ? null : (Set<Object>) Classes.coerce(LinkedHashSet.class, val);
if (vals != null && vals.size() > 0) {
if (model != null) {
((Selectable<Object>) model).setSelection(vals);
} else {
//no model case
for (final Iterator<?> it = lbx.getItems().iterator(); it.hasNext();) {
final Listitem li = (Listitem) it.next();
Object bean = li.getValue();
if (vals.contains(bean)) {
items.add(li);
}
}
}
} else if (model != null && !((Selectable<Object>) model).isSelectionEmpty()) { //model !=null and no selection
((Selectable<Object>) model).clearSelection();
}
return model == null ? items : IGNORED_VALUE;
}
@SuppressWarnings("unchecked")
public Object coerceToBean(Object val, Component comp, BindContext ctx) {
Set<Object> vals = new LinkedHashSet<Object>();
if (val != null) {
final Listbox lbx = (Listbox) comp;
final ListModel<?> model = lbx.getModel();
if (model != null && !(model instanceof Selectable)) {
throw new UiException("model doesn't implement Selectable");
}
if (model != null) {
Set<?> selection = ((Selectable<?>) model).getSelection();
if (selection != null && selection.size() > 0) {
for (Object o : selection) {
vals.add(o);
}
}
} else { //no model
final Set<Listitem> items = (Set<Listitem>) Classes.coerce(HashSet.class, val);
for (Listitem item : items) {
vals.add(item.getValue());
}
}
}
return vals;
}
}