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Java > Open Source Codes > org > apache > tapestry > wml > Timer


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.HiveMind;
18 import org.apache.tapestry.AbstractComponent;
19 import org.apache.tapestry.IMarkupWriter;
20 import org.apache.tapestry.IRequestCycle;
21
22 /**
23  * The Timer element declares a card timer, which exposes a means of processing inactivity or idle
24  * time. The timer is initialised and started at card entry and is stopped when the card is exited.
25  *
26  * @author David Solis
27  * @since 3.0
28  */
29
30 public abstract class Timer extends AbstractComponent
31 {
32     /**
33      * @see AbstractComponent#renderComponent(IMarkupWriter, IRequestCycle)
34      */
35
36     protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
37     {
38         boolean render = !cycle.isRewinding();
39
40         if (render)
41         {
42             writer.beginEmpty("timer");
43
44             writer.attribute("name", getName());
45
46             String JavaDoc value = getValue();
47             if (HiveMind.isNonBlank(value))
48                 writer.attribute("value", value);
49             else
50                 writer.attribute("value", "0");
51
52             renderInformalParameters(writer, cycle);
53
54             writer.closeTag();
55         }
56     }
57
58     public abstract String JavaDoc getName();
59
60     /** @since 4.0 */
61
62     public abstract String JavaDoc getValue();
63 }
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