Card


1   // Copyright 2004, 2005 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.tapestry.wml;
16  
17  import org.apache.hivemind.ApplicationRuntimeException;
18  import org.apache.hivemind.HiveMind;
19  import org.apache.tapestry.AbstractComponent;
20  import org.apache.tapestry.IMarkupWriter;
21  import org.apache.tapestry.IRequestCycle;
22  import org.apache.tapestry.Tapestry;
23  
24  /**
25   * A deck contains a collection of cards. There is a variety of card types, each specifying a
26   * different mode of user interaction.
27   * 
28   * @author David Solis
29   * @since 3.0
30   */
31  
32  public abstract class Card extends AbstractComponent
33  {
34      private static final String   ATTRIBUTE_NAME = "org.apache.tapestry.wml.Card";
35  
36      /**
37       * @see AbstractComponent#renderComponent(IMarkupWriter, IRequestCycle)
38       */
39  
40      protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
41      {
42          if (cycle.getAttribute(ATTRIBUTE_NAME) != null)
43              throw new ApplicationRuntimeException(Tapestry.getMessage("Card.cards-may-not-nest"),
44                      this, null, null);
45  
46          cycle.setAttribute(ATTRIBUTE_NAME, this);
47  
48          writer.begin("card");
49  
50          String   title = getTitle();
51          if (HiveMind.isNonBlank(title))
52              writer.attribute("title", title);
53  
54          renderInformalParameters(writer, cycle);
55  
56          IMarkupWriter nestedWriter = writer.getNestedWriter();
57  
58          renderBody(nestedWriter, cycle);
59  
60          nestedWriter.close();
61  
62          writer.end();
63  
64          cycle.removeAttribute(ATTRIBUTE_NAME);
65      }
66  
67      public abstract String   getTitle();
68  }
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