| /* |
| * Copyright 2002,2004 The Apache Software Foundation. |
| * |
| * 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.apache.commons.jelly.tags.core; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.commons.jelly.JellyTagException; |
| import org.apache.commons.jelly.expression.Expression; |
| import org.apache.commons.jelly.impl.CollectionTag; |
| |
| /** |
| * A tag which creates a List implementation and optionally |
| * adds all of the elements identified by the items attribute. |
| * The exact implementation of List can be specified via the |
| * class attribute |
| * </pre> |
| * |
| * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
| * @version $Revision: 1.3 $ |
| */ |
| public class UseListTag extends UseBeanTag implements CollectionTag { |
| |
| private Expression items; |
| |
| public UseListTag(){ |
| } |
| |
| public List getList() { |
| return (List) getBean(); |
| } |
| |
| |
| // CollectionTag interface |
| //------------------------------------------------------------------------- |
| public void addItem(Object value) { |
| getList().add(value); |
| } |
| |
| // DynaTag interface |
| //------------------------------------------------------------------------- |
| public Class getAttributeType(String name) throws JellyTagException { |
| if (name.equals("items")) { |
| return Expression.class; |
| } |
| return super.getAttributeType(name); |
| } |
| |
| |
| // Implementation methods |
| //------------------------------------------------------------------------- |
| |
| protected void setBeanProperties(Object bean, Map attributes) throws JellyTagException { |
| items = (Expression) attributes.remove("items"); |
| super.setBeanProperties(bean, attributes); |
| } |
| |
| protected void processBean(String var, Object bean) throws JellyTagException { |
| super.processBean(var, bean); |
| |
| List list = getList(); |
| |
| // if the items variable is specified lets append all the items |
| if (items != null) { |
| Iterator iter = items.evaluateAsIterator(context); |
| while (iter.hasNext()) { |
| list.add( iter.next() ); |
| } |
| } |
| } |
| |
| protected Class getDefaultClass() { |
| return ArrayList.class; |
| } |
| } |