Coverage report

  %line %branch
org.apache.commons.jelly.tags.util.AvailableTag
87% 
100% 

 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.util;
 18  
 
 19  
 import java.io.File;
 20  
 import java.io.IOException;
 21  
 import java.io.InputStream;
 22  
 import java.net.MalformedURLException;
 23  
 import java.net.URL;
 24  
 
 25  
 import org.apache.commons.jelly.JellyTagException;
 26  
 import org.apache.commons.jelly.TagSupport;
 27  
 import org.apache.commons.jelly.XMLOutput;
 28  
 
 29  
 /**
 30  
  * A tag which evaluates its body if the given file is available.
 31  
  * The file can be specified via a File object or via a relative or absolute
 32  
  * URI from the current Jelly script.
 33  
  *
 34  
  * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
 35  
  * @version $Revision: 1.5 $
 36  
  */
 37  
 public class AvailableTag extends TagSupport {
 38  
 
 39  
     private File file;
 40  
     private String uri;
 41  
 
 42  4
     public AvailableTag() {
 43  4
     }
 44  
 
 45  
     // Tag interface
 46  
     //-------------------------------------------------------------------------
 47  
     public void doTag(final XMLOutput output) throws JellyTagException {
 48  4
         boolean available = false;
 49  
 
 50  4
         if (file != null) {
 51  2
             available = file.exists();
 52  
         }
 53  2
         else if (uri != null) {
 54  
             try {
 55  2
                 URL url = context.getResource(uri);
 56  2
                 String fileName = url.getFile();
 57  2
                 InputStream is = url.openStream();
 58  1
                 available = (is != null);
 59  1
                 is.close();
 60  1
             } catch (MalformedURLException e) {
 61  0
                 throw new JellyTagException(e);
 62  
             } catch (IOException ioe) {
 63  1
                 available = false;
 64  
             }
 65  
         }
 66  
 
 67  4
         if (available) {
 68  2
             invokeBody(output);
 69  
         }
 70  4
     }
 71  
 
 72  
     // Properties
 73  
     //-------------------------------------------------------------------------
 74  
 
 75  
 
 76  
     /**
 77  
      * Returns the file.
 78  
      * @return File
 79  
      */
 80  
     public File getFile() {
 81  0
         return file;
 82  
     }
 83  
 
 84  
     /**
 85  
      * Returns the uri.
 86  
      * @return String
 87  
      */
 88  
     public String getUri() {
 89  0
         return uri;
 90  
     }
 91  
 
 92  
     /**
 93  
      * Sets the file to use to test whether it exists or not.
 94  
      * @param file the file to test for
 95  
      */
 96  
     public void setFile(File file) {
 97  2
         this.file = file;
 98  2
     }
 99  
 
 100  
     /**
 101  
      * Sets the URI to use to test for availability.
 102  
      * The URI can be a full file based URL or a relative URI
 103  
      * or an absolute URI from the root context.
 104  
      *
 105  
      * @param uri the URI of the file to test
 106  
      */
 107  
     public void setUri(String uri) {
 108  2
         this.uri = uri;
 109  2
     }
 110  
 
 111  
 }

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