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1   /*
2    * Copyright 2002,2004 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  package org.apache.commons.jelly.tags.beanshell;
17  
18  import bsh.EvalError;
19  
20  import org.apache.commons.jelly.JellyContext;
21  import org.apache.commons.jelly.JellyException;
22  import org.apache.commons.jelly.expression.Expression;
23  import org.apache.commons.jelly.expression.ExpressionFactory;
24  
25  /*** Represents a factory of <a href="http://www.beanshell.org" target="alexandria_uri">http://www.beanshell.org">beanshell</a> expressions
26    *
27    * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
28    * @version $Revision: 155420 $
29    */
30  public class BeanShellExpressionFactory implements ExpressionFactory {
31  
32      /***
33       * A helper method to return the JellyInterpreter for the given JellyContext
34       */
35      public static JellyInterpreter getInterpreter(JellyContext context) throws EvalError {
36  
37          /***
38           * @todo when we can unify the BeanShell and Jelly variable scopes we can share a single
39           * BeanShell context for each JellyContext.
40           * For now lets create a new one each time, which is slower.
41           */
42          JellyInterpreter interpreter = new JellyInterpreter();
43          interpreter.setJellyContext(context);
44          return interpreter;
45  /*
46          JellyInterpreter interpreter
47              = (JellyInterpreter) context.getVariable( "org.apache.commons.jelly.beanshell.JellyInterpreter" );
48          if ( interpreter == null ) {
49              interpreter = new JellyInterpreter();
50              interpreter.setJellyContext(context);
51              context.setVariable( "org.apache.commons.jelly.beanshell.JellyInterpreter", interpreter );
52          }
53          return interpreter;
54  */
55      }
56  
57  
58      // ExpressionFactory interface
59      //-------------------------------------------------------------------------
60      public Expression createExpression(String text) throws JellyException {
61          return new BeanShellExpression(text);
62      }
63  }