View Javadoc

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.struts2.jasper.tagplugins.jstl.core;
20  
21  import org.apache.struts2.jasper.compiler.tagplugin.TagPlugin;
22  import org.apache.struts2.jasper.compiler.tagplugin.TagPluginContext;
23  
24  public final class If implements TagPlugin {
25  
26      public void doTag(TagPluginContext ctxt) {
27          String condV = ctxt.getTemporaryVariableName();
28          ctxt.generateJavaSource("boolean " + condV + "=");
29          ctxt.generateAttribute("test");
30          ctxt.generateJavaSource(";");
31          if (ctxt.isAttributeSpecified("var")) {
32              String scope = "PageContext.PAGE_SCOPE";
33              if (ctxt.isAttributeSpecified("scope")) {
34                  String scopeStr = ctxt.getConstantAttribute("scope");
35                  if ("request".equals(scopeStr)) {
36                      scope = "PageContext.REQUEST_SCOPE";
37                  } else if ("session".equals(scopeStr)) {
38                      scope = "PageContext.SESSION_SCOPE";
39                  } else if ("application".equals(scopeStr)) {
40                      scope = "PageContext.APPLICATION_SCOPE";
41                  }
42              }
43              ctxt.generateJavaSource("_jspx_page_context.setAttribute(");
44              ctxt.generateAttribute("var");
45              ctxt.generateJavaSource(", new Boolean(" + condV + ")," + scope + ");");
46          }
47          ctxt.generateJavaSource("if (" + condV + "){");
48          ctxt.generateBody();
49          ctxt.generateJavaSource("}");
50      }
51  }