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Java > Open Source Codes > org > apache > jasper > tagplugins > jstl > core > If


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18
19 package org.apache.jasper.tagplugins.jstl.core;
20
21 import org.apache.jasper.compiler.tagplugin.*;
22
23 public final class If implements TagPlugin {
24     
25     public void doTag(TagPluginContext ctxt) {
26         String JavaDoc condV = ctxt.getTemporaryVariableName();
27         ctxt.generateJavaSource("boolean " + condV + "=");
28         ctxt.generateAttribute("test");
29         ctxt.generateJavaSource(";");
30         if (ctxt.isAttributeSpecified("var")) {
31             String JavaDoc scope = "PageContext.PAGE_SCOPE";
32             if (ctxt.isAttributeSpecified("scope")) {
33                 String JavaDoc scopeStr = ctxt.getConstantAttribute("scope");
34                 if ("request".equals(scopeStr)) {
35                     scope = "PageContext.REQUEST_SCOPE";
36                 } else if ("session".equals(scopeStr)) {
37                     scope = "PageContext.SESSION_SCOPE";
38                 } else if ("application".equals(scopeStr)) {
39                     scope = "PageContext.APPLICATION_SCOPE";
40                 }
41             }
42             ctxt.generateJavaSource("_jspx_page_context.setAttribute(");
43             ctxt.generateAttribute("var");
44             ctxt.generateJavaSource(", new Boolean(" + condV + ")," + scope + ");");
45         }
46         ctxt.generateJavaSource("if (" + condV + "){");
47         ctxt.generateBody();
48         ctxt.generateJavaSource("}");
49     }
50 }
51
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