001// Copyright 2005 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
015package org.apache.tapestry.describe;
016
017import org.apache.tapestry.IMarkupWriter;
018import org.apache.tapestry.IRequestCycle;
019
020/**
021 * Renders an object array as an unordered list; each element is recursively rendered.
022 * 
023 * @author Howard M. Lewis Ship
024 * @since 4.0
025 */
026public class ObjectArrayRenderStrategy implements RenderStrategy
027{
028    private RenderStrategy _renderStrategy;
029
030    public void renderObject(Object object, IMarkupWriter writer, IRequestCycle cycle)
031    {
032        Object[] array = (Object[]) object;
033
034        if (array.length == 0)
035        {
036            writer.begin("em");
037            writer.print("empty list");
038            writer.end();
039            return;
040        }
041
042        writer.begin("ul");
043
044        for (int i = 0; i < array.length; i++)
045        {
046            writer.begin("li");
047
048            Object item = array[i];
049
050            if (item == null)
051            {
052                writer.begin("em");
053                writer.print("<NULL>");
054                writer.end();
055            }
056            else
057                _renderStrategy.renderObject(item, writer, cycle);
058
059            writer.end();
060
061        }
062
063        writer.end();
064    }
065
066    public void setRenderStrategy(RenderStrategy renderStrategy)
067    {
068        _renderStrategy = renderStrategy;
069    }
070
071}