create Select Items from JSF UIComponent - Java JSF

Java examples for JSF:UIComponent

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Description

create Select Items from JSF UIComponent

Demo Code

/*/*from  w  w  w .  ja  v a  2 s . c o  m*/
 * Copyright 2009 Prime Technology.
 *
 * 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.
 */
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.component.UIForm;
import javax.faces.component.UISelectItem;
import javax.faces.component.UISelectItems;
import javax.faces.component.ValueHolder;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.model.SelectItem;

public class Main{
    public static List<SelectItem> createSelectItems(UIComponent component) {
        List<SelectItem> items = new ArrayList<SelectItem>();
        Iterator<UIComponent> children = component.getChildren().iterator();

        while (children.hasNext()) {
            UIComponent child = children.next();

            if (child instanceof UISelectItem) {
                UISelectItem selectItem = (UISelectItem) child;

                items.add(new SelectItem(selectItem.getItemValue(),
                        selectItem.getItemLabel()));
            } else if (child instanceof UISelectItems) {
                Object selectItems = ((UISelectItems) child).getValue();

                if (selectItems instanceof SelectItem[]) {
                    SelectItem[] itemsArray = (SelectItem[]) selectItems;

                    for (SelectItem item : itemsArray)
                        items.add(new SelectItem(item.getValue(), item
                                .getLabel()));

                } else if (selectItems instanceof Collection) {
                    @SuppressWarnings("unchecked")
                    Collection<SelectItem> collection = (Collection<SelectItem>) selectItems;

                    for (SelectItem item : collection)
                        items.add(new SelectItem(item.getValue(), item
                                .getLabel()));
                }
            }
        }

        return items;
    }
}

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