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


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 setvar element specifies the variable to set in the current browser context as a side effect
24  * of executing a task.
25  *
26  * @author David Solis
27  * @since 3.0
28  */
29
30 public abstract class Setvar extends AbstractComponent
31 {
32     /**
33      * @see AbstractComponent#renderComponent(IMarkupWriter, IRequestCycle)
34      */
35
36     protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
37     {
38         if (cycle.isRewinding())
39             return;
40
41         writer.beginEmpty("setvar");
42
43         writer.attribute("name", getName());
44
45         renderInformalParameters(writer, cycle);
46
47         String JavaDoc value = getValue();
48
49         if (HiveMind.isNonBlank(value))
50             writer.attribute("value", value);
51         else
52             writer.attribute("value", "");
53
54         writer.closeTag();
55     }
56
57     public abstract String JavaDoc getName();
58
59     public abstract String JavaDoc getValue();
60 }
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