Coverage report

  %line %branch
org.apache.commons.jelly.tags.bsf.BSFExpression
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 1  
 /*
 2  
  * Copyright 2002,2004 The Apache Software Foundation.
 3  
  *
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  * Licensed under the Apache License, Version 2.0 (the "License");
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  * 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.bsf;
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 18  
 import org.apache.bsf.BSFEngine;
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 import org.apache.bsf.BSFManager;
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 21  
 import java.util.Iterator;
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 23  
 import org.apache.commons.jelly.JellyContext;
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 import org.apache.commons.jelly.expression.ExpressionSupport;
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 26  
 import org.apache.commons.logging.Log;
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 import org.apache.commons.logging.LogFactory;
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 30  
 /** Represents a BSF expression
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   *
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   * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
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   * @version $Revision: 1.5 $
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   */
 35  0
 public class BSFExpression extends ExpressionSupport {
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     /** The Log to which logging calls will be made. */
 38  0
     private static final Log log = LogFactory.getLog( BSFExpression.class );
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     /** The expression */
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     private String text;
 42  
 
 43  
     /** The BSF Engine to evaluate expressions */
 44  
     private BSFEngine engine;
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     /** The BSF Manager to evaluate expressions */
 46  
     private BSFManager manager;
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 48  
     /** The adapter to BSF's ObjectRegistry that uses the JellyContext */
 49  
     private JellyContextRegistry registry;
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 51  0
     public BSFExpression(String text, BSFEngine engine, BSFManager manager, JellyContextRegistry registry) {
 52  0
         this.text = text;
 53  0
         this.engine = engine;
 54  0
         this.manager = manager;
 55  0
         this.registry = registry;
 56  0
     }
 57  
 
 58  
     // Expression interface
 59  
     //-------------------------------------------------------------------------
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     public String getExpressionText() {
 61  0
         return "${" + text + "}";
 62  
     }
 63  
 
 64  
     public Object evaluate(JellyContext context) {
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         // XXXX: unfortunately we must sychronize evaluations
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         // so that we can swizzle in the context.
 67  
         // maybe we could create an expression from a context
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         // (and so create a BSFManager for a context)
 69  0
         synchronized (registry) {
 70  0
             registry.setJellyContext(context);
 71  
 
 72  
             try {
 73  
                 // XXXX: hack - there must be a better way!!!
 74  0
                 for ( Iterator iter = context.getVariableNames(); iter.hasNext(); ) {
 75  0
                     String name = (String) iter.next();
 76  0
                     Object value = context.getVariable( name );
 77  0
                     manager.declareBean( name, value, value.getClass() );
 78  
                 }
 79  0
                 return engine.eval( text, -1, -1, text );
 80  
             }
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             catch (Exception e) {
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                 log.warn( "Caught exception evaluating: " + text + ". Reason: " + e, e );
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                 return null;
 84  
             }
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         }
 86  
     }
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 }

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