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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  import org.apache.struts2.jasper.tagplugins.jstl.Util;
24  
25  public class Remove implements TagPlugin {
26  
27      public void doTag(TagPluginContext ctxt) {
28  
29          //scope flag
30          boolean hasScope = ctxt.isAttributeSpecified("scope");
31  
32          //the value of the "var"
33          String strVar = ctxt.getConstantAttribute("var");
34  
35          //remove attribute from certain scope.
36          //default scope is "page".
37          if (hasScope) {
38              int iScope = Util.getScope(ctxt.getConstantAttribute("scope"));
39              ctxt.generateJavaSource("pageContext.removeAttribute(\"" + strVar + "\"," + iScope + ");");
40          } else {
41              ctxt.generateJavaSource("pageContext.removeAttribute(\"" + strVar + "\");");
42          }
43      }
44  
45  }