001// Copyright 2004, 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.wml;
016
017import org.apache.hivemind.ApplicationRuntimeException;
018import org.apache.hivemind.HiveMind;
019import org.apache.tapestry.AbstractComponent;
020import org.apache.tapestry.IMarkupWriter;
021import org.apache.tapestry.IRequestCycle;
022import org.apache.tapestry.Tapestry;
023
024/**
025 * A deck contains a collection of cards. There is a variety of card types, each specifying a
026 * different mode of user interaction.
027 * 
028 * @author David Solis
029 * @since 3.0
030 */
031
032public abstract class Card extends AbstractComponent
033{
034    private static final String ATTRIBUTE_NAME = "org.apache.tapestry.wml.Card";
035
036    /**
037     * @see AbstractComponent#renderComponent(IMarkupWriter, IRequestCycle)
038     */
039
040    protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
041    {
042        if (cycle.getAttribute(ATTRIBUTE_NAME) != null)
043            throw new ApplicationRuntimeException(Tapestry.getMessage("Card.cards-may-not-nest"),
044                    this, null, null);
045
046        cycle.setAttribute(ATTRIBUTE_NAME, this);
047
048        writer.begin("card");
049
050        String title = getTitle();
051        if (HiveMind.isNonBlank(title))
052            writer.attribute("title", title);
053
054        renderInformalParameters(writer, cycle);
055
056        IMarkupWriter nestedWriter = writer.getNestedWriter();
057
058        renderBody(nestedWriter, cycle);
059
060        nestedWriter.close();
061
062        writer.end();
063
064        cycle.removeAttribute(ATTRIBUTE_NAME);
065    }
066
067    public abstract String getTitle();
068}