Source Code Cross Referenced for If.java in  » J2EE » webwork-2.2.6 » com » opensymphony » webwork » components » Java Source Code / Java DocumentationJava Source Code and Java Documentation

01:        package com.opensymphony.webwork.components;
02:
03:        import com.opensymphony.xwork.util.OgnlValueStack;
04:
05:        import java.io.Writer;
06:
07:        /**
08:         * <!-- START SNIPPET: javadoc -->
09:         *
10:         * <p>Perform basic condition flow. 'If' tag could be used by itself or
11:         * with 'Else If' Tag and/or single/multiple 'Else' Tag.</p>
12:         *
13:         * <!-- END SNIPPET: javadoc -->
14:         *
15:         *
16:         * <!-- START SNIPPET: params -->
17:         *
18:         * <ul>
19:         *
20:         *  <li>test* (Boolean) - Logic to determined if body of tag is to be displayed</li>
21:         *
22:         * </ul>
23:         *
24:         * <!-- END SNIPPET: params -->
25:         *
26:         *
27:         * <pre>
28:         * <!-- START SNIPPET: example -->
29:         *  &lt;ww:if test="%{false}"&gt;
30:         *	    &lt;div&gt;Will Not Be Executed&lt;/div&gt;
31:         *  &lt;/ww:if&gt;
32:         * 	&lt;ww:elseif test="%{true}"&gt;
33:         *	    &lt;div&gt;Will Be Executed&lt;/div&gt;
34:         *  &lt;/ww:elseif&gt;
35:         *  &lt;ww:else&gt;
36:         *	    &lt;div&gt;Will Not Be Executed&lt;/div&gt;
37:         *  &lt;/ww:else&gt;
38:         * <!-- END SNIPPET: example -->
39:         * </pre>
40:         *
41:         * @author tmjee
42:         *
43:         * @see Else
44:         * @see ElseIf
45:         *
46:         * @ww.tag name="if" tld-body-content="JSP" description="If tag" tld-tag-class="com.opensymphony.webwork.views.jsp.IfTag"
47:         */
48:        public class If extends Component {
49:            public static final String ANSWER = "webwork.if.answer";
50:
51:            Boolean answer;
52:            String test;
53:
54:            /**
55:             * Expression to determine if body of tag is to be displayed
56:             * @ww.tagattribute required="true" type="Boolean"
57:             */
58:            public void setTest(String test) {
59:                this .test = test;
60:            }
61:
62:            public If(OgnlValueStack stack) {
63:                super (stack);
64:            }
65:
66:            public boolean start(Writer writer) {
67:                answer = (Boolean) findValue(test, Boolean.class);
68:
69:                if (answer == null) {
70:                    answer = Boolean.FALSE;
71:                }
72:
73:                stack.getContext().put(ANSWER, answer);
74:
75:                return answer.booleanValue();
76:            }
77:
78:            public boolean end(Writer writer, String body) {
79:                stack.getContext().put(ANSWER, answer);
80:                return super.end(writer, body);
81:            }
82:        }