/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.myfaces.custom.selectitems;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.faces.context.FacesContext;
import javax.faces.model.SelectItem;
import javax.faces.model.SelectItemGroup;
/**
* An extended version of the standard UISelectItems. Populates the
* SelectItem collection from the given value automatically using
* the itemLabel and itemValue attributes. By using the component
* there is no need to manually create a SelectItem collection
* because component automatically populates SelectItem objects
* from types like Collection, Map and etc..
*
* @JSFComponent
* name = "t:selectItems"
* class = "org.apache.myfaces.custom.selectitems.UISelectItems"
* tagClass = "org.apache.myfaces.custom.selectitems.SelectItemsTag"
* @since 1.1.7
* @author cagatay (latest modification by $Author: lu4242 $)
* @version $Revision: 691856 $ $Date: 2008-09-03 21:40:30 -0500 (Wed, 03 Sep 2008) $
*/
public abstract class AbstractUISelectItems extends javax.faces.component.UISelectItems {
public static final String COMPONENT_TYPE = "org.apache.myfaces.UISelectItems";
/**
* name of the iterator
*
* @JSFProperty
*/
public abstract String getVar();
/**
* name of the selectitem
*
* @JSFProperty
*/
public abstract Object getItemLabel();
/**
* value of the selectitem
*
* @JSFProperty
*/
public abstract Object getItemValue();
public Object getValue() {
Object value = super.getValue();
return createSelectItems(value);
}
private SelectItem[] createSelectItems(Object value) {
List items = new ArrayList();
if (value instanceof SelectItem[]) {
return (SelectItem[]) value;
}
else if (value instanceof Collection) {
Collection collection = (Collection) value;
for (Iterator iter = collection.iterator(); iter.hasNext();) {
Object currentItem = (Object) iter.next();
if (currentItem instanceof SelectItemGroup) {
SelectItemGroup itemGroup = (SelectItemGroup) currentItem;
SelectItem[] itemsFromGroup = itemGroup.getSelectItems();
for (int i = 0; i < itemsFromGroup.length; i++) {
items.add(itemsFromGroup[i]);
}
}
else {
putIteratorToRequestParam(currentItem);
SelectItem selectItem = createSelectItem();
removeIteratorFromRequestParam();
items.add(selectItem);
}
}
}
else if (value instanceof Map) {
Map map = (Map) value;
for (Iterator iter = map.entrySet().iterator(); iter.hasNext();) {
Entry currentItem = (Entry) iter.next();
putIteratorToRequestParam(currentItem.getValue());
SelectItem selectItem = createSelectItem();
removeIteratorFromRequestParam();
items.add(selectItem);
}
}
return (SelectItem[]) items.toArray(new SelectItem[0]);
}
private SelectItem createSelectItem() {
SelectItem item = null;
Object value = getItemValue();
String label = getItemLabel() != null ? getItemLabel().toString() : null;
if(label != null)
item = new SelectItem(value, label);
else
item = new SelectItem(value);
return item;
}
private void putIteratorToRequestParam(Object object) {
FacesContext.getCurrentInstance().getExternalContext().getRequestMap().put(getVar(), object);
}
private void removeIteratorFromRequestParam() {
FacesContext.getCurrentInstance().getExternalContext().getRequestMap().remove(getVar());
}
}