expression


1   /*
2    * Copyright 1999,2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.taglibs.bsf ;
18  
19  import javax.servlet.jsp.* ;
20  import javax.servlet.jsp.tagext.* ;
21  import java.io.IOException   ;
22  
23  import org.apache.bsf.* ;
24  
25  public class expression implements BodyTag
26  {
27      protected Tag          parent ;
28      protected BodyContent  bodyOut ;
29      protected PageContext  pageContext ;
30      protected String         language ;
31  
32      public void setLanguage(String   value)           { language = value ; };
33      public void setParent(Tag parent)               { this.parent = parent ; };
34      public Tag  getParent()                         { return( this.parent ); };
35      public void doInitBody()  throws JspException   { };
36      public int  doAfterBody() throws JspException   { return 0; };
37      public void release()                           { };
38      public void setBodyContent(BodyContent bodyOut) { this.bodyOut = bodyOut;};
39      public int  doStartTag() throws JspException    { return(EVAL_BODY_TAG);};
40  
41      public void setPageContext(PageContext pageContext) { 
42          this.pageContext = pageContext ;
43      };
44  
45      private void register( BSFManager mgr, String   name, Object   bean ) 
46                       throws Exception   {
47      if ( bean == null ) return ;
48          try {
49          mgr.declareBean( name, bean, bean.getClass() );
50      }
51      catch( Exception   e ) {
52          throw e ;
53      }
54      };
55  
56      public int doEndTag() throws JspException {
57          try {
58              JspWriter out = pageContext.getOut();
59          if ( bodyOut == null ) return( EVAL_PAGE );
60  
61              BSFManager mgr  = new BSFManager ();
62              BSFEngine  BSFengine = mgr.loadScriptingEngine (language);
63  
64              try {
65              register( mgr, "request"    , pageContext.getRequest() );
66          register( mgr, "response"   , pageContext.getResponse() );
67          register( mgr, "pageContext", pageContext );
68          register( mgr, "application", pageContext.getServletContext() );
69          register( mgr, "out"        , out );
70          register( mgr, "config"     , pageContext.getServletConfig() );
71          register( mgr, "page"       , pageContext.getPage() );
72          register( mgr, "exception"  , pageContext.getException() );
73          register( mgr, "session"    , pageContext.getSession() );
74          } catch( Exception   e ) {
75              out.println( e.toString() );
76              e.printStackTrace();
77          }
78  
79          Object   result ;
80          result = BSFengine.eval ("<unknown>", 0, 0, bodyOut.getString() );
81          if ( result != null )
82              out.println( result.toString() );
83      } catch( Exception   e ) {
84          System.out.println( e.toString() );
85          e.printStackTrace();
86          // throw new JspException( e.toString() );
87      }
88          return( EVAL_PAGE );
89      };
90  }
91
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