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1   /*
2    * $Id: StrutsBodyTagSupport.java 726715 2008-12-15 15:39:15Z musachy $
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *  http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  package org.apache.struts2.views.jsp;
23  
24  import java.io.PrintWriter;
25  
26  import javax.servlet.jsp.tagext.BodyTagSupport;
27  
28  import org.apache.struts2.components.Component;
29  import org.apache.struts2.util.FastByteArrayOutputStream;
30  
31  import com.opensymphony.xwork2.util.TextParseUtil;
32  import com.opensymphony.xwork2.util.ValueStack;
33  
34  
35  /***
36   * Contains common functonalities for Struts JSP Tags.
37   *
38   */
39  public class StrutsBodyTagSupport extends BodyTagSupport {
40  
41      private static final long serialVersionUID = -1201668454354226175L;
42  
43      protected ValueStack getStack() {
44          return TagUtils.getStack(pageContext);
45      }
46  
47      protected String findString(String expr) {
48          return (String) findValue(expr, String.class);
49      }
50  
51      protected Object findValue(String expr) {
52      	expr = Component.stripExpressionIfAltSyntax(getStack(), expr);
53  
54          return getStack().findValue(expr);
55      }
56  
57      protected Object findValue(String expr, Class toType) {
58          if (Component.altSyntax(getStack()) && toType == String.class) {
59          	return TextParseUtil.translateVariables('%', expr, getStack());
60              //return translateVariables(expr, getStack());
61          } else {
62          	expr = Component.stripExpressionIfAltSyntax(getStack(), expr);
63  
64              return getStack().findValue(expr, toType);
65          }
66      }
67  
68      protected String toString(Throwable t) {
69          FastByteArrayOutputStream bout = new FastByteArrayOutputStream();
70          PrintWriter wrt = new PrintWriter(bout);
71          t.printStackTrace(wrt);
72          wrt.close();
73  
74          return bout.toString();
75      }
76  
77      protected String getBody() {
78          if (bodyContent == null) {
79              return "";
80          } else {
81              return bodyContent.getString().trim();
82          }
83      }
84  }