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Java > Open Source Codes > examples > FooTag


1 /*
2 * Copyright 2004 The Apache Software Foundation
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package examples;
17
18 import javax.servlet.jsp.*;
19 import javax.servlet.jsp.tagext.*;
20 import java.util.Hashtable JavaDoc;
21 import java.io.Writer JavaDoc;
22 import java.io.IOException JavaDoc;
23
24 /**
25  * Example1: the simplest tag
26  * Collect attributes and call into some actions
27  *
28  * <foo att1="..." att2="...." att3="...." />
29  */
30
31 public class FooTag
32     extends ExampleTagBase
33 {
34     private String JavaDoc atts[] = new String JavaDoc[3];
35     int i = 0;
36     
37     private final void setAtt(int index, String JavaDoc value) {
38         atts[index] = value;
39     }
40     
41     public void setAtt1(String JavaDoc value) {
42         setAtt(0, value);
43     }
44     
45     public void setAtt2(String JavaDoc value) {
46         setAtt(1, value);
47     }
48
49     public void setAtt3(String JavaDoc value) {
50         setAtt(2, value);
51     }
52     
53     /**
54      * Process start tag
55      *
56      * @return EVAL_BODY_INCLUDE
57      */
58     public int doStartTag() throws JspException {
59         i = 0;
60     return EVAL_BODY_TAG;
61     }
62
63     public void doInitBody() throws JspException {
64         pageContext.setAttribute("member", atts[i]);
65         i++;
66     }
67     
68     public int doAfterBody() throws JspException {
69         try {
70             if (i == 3) {
71                 bodyOut.writeOut(bodyOut.getEnclosingWriter());
72                 return SKIP_BODY;
73             } else
74                 pageContext.setAttribute("member", atts[i]);
75             i++;
76             return EVAL_BODY_TAG;
77         } catch (IOException JavaDoc ex) {
78             throw new JspTagException(ex.toString());
79         }
80     }
81 }
82
83
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