Coverage report

  %line %branch
org.apache.commons.jelly.tags.core.WhileTag
78% 
90% 

 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  
 
 17  
 package org.apache.commons.jelly.tags.core;
 18  
 
 19  
 import org.apache.commons.jelly.JellyTagException;
 20  
 import org.apache.commons.jelly.MissingAttributeException;
 21  
 import org.apache.commons.jelly.TagSupport;
 22  
 import org.apache.commons.jelly.XMLOutput;
 23  
 import org.apache.commons.jelly.expression.Expression;
 24  
 import org.apache.commons.jelly.impl.BreakException;
 25  
 import org.apache.commons.logging.Log;
 26  
 import org.apache.commons.logging.LogFactory;
 27  
 
 28  
 /**
 29  
  * A tag which performs an iteration while the result of an expression is true.
 30  
  *
 31  
  * @author <a href="mailto:eric@ericalexander.net">Eric Alexander</a>
 32  
  * @author dIon Gillard
 33  
  * @version $Revision: 155420 $
 34  
  */
 35  
 public class WhileTag extends TagSupport {
 36  
 
 37  
     /** The Log to which logging calls will be made. */
 38  546
     private static final Log log = LogFactory.getLog(WhileTag.class);
 39  
 
 40  
     /** The expression to use to determine if the while should continue */
 41  
     private Expression test;
 42  
 
 43  
     /**
 44  
      * Create a new while tag
 45  
      */
 46  26
     public WhileTag() {
 47  26
     }
 48  
 
 49  
     /**
 50  
      * Tag interface
 51  
      * @param output destination for xml output
 52  
      * @throws MissingAttributeException when the test attribute is missing
 53  
      * @throws Exception for anything else
 54  
      */
 55  
     public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException {
 56  26
         if (test != null) {
 57  
             try {
 58  78
                 while (test.evaluateAsBoolean(getContext())) {
 59  78
                     if (log.isDebugEnabled()) {
 60  0
                         log.debug("evaluated to true! gonna keep on chuggin!");
 61  
                     }
 62  78
                     invokeBody(output);
 63  52
                 }
 64  
             }
 65  26
             catch (BreakException e) {
 66  26
                 if (log.isDebugEnabled()) {
 67  0
                     log.debug("loop terminated by break: " + e, e);
 68  
                 }
 69  0
             }
 70  26
         }
 71  
         else {
 72  0
             throw new MissingAttributeException("test");
 73  
         }
 74  26
     }
 75  
 
 76  
     // Properties
 77  
     //-------------------------------------------------------------------------
 78  
 
 79  
     /**
 80  
      * Setter for the expression
 81  
      * @param e the expression to test
 82  
      */
 83  
     public void setTest(Expression e) {
 84  26
         this.test = e;
 85  26
     }
 86  
 }
 87  
 

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