001    // Copyright 2008 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.internal.renderers;
016    
017    import org.apache.tapestry5.MarkupWriter;
018    import org.apache.tapestry5.ioc.annotations.Primary;
019    import org.apache.tapestry5.services.ObjectRenderer;
020    
021    import java.util.List;
022    
023    /**
024     * Renders a List, but rendering an unordered list.
025     */
026    public class ListRenderer implements ObjectRenderer<List>
027    {
028        private final ObjectRenderer masterRenderer;
029    
030        public ListRenderer(@Primary ObjectRenderer masterRenderer)
031        {
032            this.masterRenderer = masterRenderer;
033        }
034    
035        public void render(List list, MarkupWriter writer)
036        {
037            if (list.isEmpty())
038            {
039                writer.element("em");
040                writer.write("empty list");
041                writer.end();
042                return;
043            }
044    
045            writer.element("ul", "class", "t-data-list");
046    
047            for (Object element : list)
048            {
049                writer.element("li");
050    
051                masterRenderer.render(element, writer);
052    
053                writer.end();
054            }
055    
056            writer.end();
057        }
058    }