Coverage report

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org.apache.commons.jelly.tags.jface.SelectionChangedListenerTag
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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.jface;
 17  
 
 18  
 import org.apache.commons.jelly.JellyTagException;
 19  
 import org.apache.commons.jelly.MissingAttributeException;
 20  
 import org.apache.commons.jelly.TagSupport;
 21  
 import org.apache.commons.jelly.XMLOutput;
 22  
 import org.apache.commons.logging.Log;
 23  
 import org.apache.commons.logging.LogFactory;
 24  
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 25  
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 26  
 import org.eclipse.jface.viewers.Viewer;
 27  
 
 28  
 /**
 29  
  * This tag adds a listener for selection changes in this viewer.
 30  
  *
 31  
  * @author <a href="mailto:ckl@dacelo.nl">Christiaan ten Klooster</a>
 32  
  */
 33  0
 public class SelectionChangedListenerTag
 34  
     extends TagSupport
 35  
     implements ISelectionChangedListener {
 36  
 
 37  
     /** The Log to which logging calls will be made. */
 38  0
     private static final Log log =
 39  
         LogFactory.getLog(SelectionChangedListenerTag.class);
 40  
 
 41  0
     private String var = "event";
 42  
     private XMLOutput output;
 43  
 
 44  
     /*
 45  
      * @see org.apache.commons.jelly.Tag#doTag(org.apache.commons.jelly.XMLOutput)
 46  
      */
 47  
     public void doTag(XMLOutput output)
 48  
         throws MissingAttributeException, JellyTagException {
 49  0
         if (var == null) {
 50  0
             throw new MissingAttributeException("var");
 51  
         }
 52  
 
 53  0
         Viewer viewer = getParentViewer();
 54  0
         if (viewer == null) {
 55  0
             throw new JellyTagException("This tag must be nested within a viewer tag");
 56  
         }
 57  
 
 58  0
         viewer.addSelectionChangedListener(this);
 59  0
         this.output = output;
 60  0
     }
 61  
 
 62  
     public Viewer getParentViewer() {
 63  0
         ViewerTag tag = (ViewerTag) findAncestorWithClass(ViewerTag.class);
 64  0
         if (tag != null) {
 65  0
             return tag.getViewer();
 66  
         }
 67  0
         return null;
 68  
     }
 69  
 
 70  
     /**
 71  
      * @return String
 72  
      */
 73  
     public String getVar() {
 74  0
         return var;
 75  
     }
 76  
 
 77  
     /**
 78  
      * Sets the var.
 79  
      * @param var The var to set
 80  
      */
 81  
     public void setVar(String var) {
 82  0
         this.var = class="keyword">var;
 83  0
     }
 84  
 
 85  
     //  Listener interface
 86  
     //-------------------------------------------------------------------------
 87  
 
 88  
     /*
 89  
      * @see org.eclipse.jface.viewers.ISelectionChangedListener#selectionChanged(org.eclipse.jface.viewers.SelectionChangedEvent)
 90  
      */
 91  
     public void selectionChanged(SelectionChangedEvent event) {
 92  
         try {
 93  0
             context.setVariable(var, event);
 94  0
             invokeBody(output);
 95  0
         } catch (Exception e) {
 96  0
             log.error(
 97  
                 "Caught exception: " + e + " while processing event: " + event,
 98  
                 e);
 99  
         }
 100  0
     }
 101  
 
 102  
 }

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