Coverage report

  %line %branch
org.apache.commons.jelly.tags.core.GetStaticTag
83% 
97% 

 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.core;
 17  
 
 18  
 import org.apache.commons.jelly.JellyContext;
 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.util.ClassLoaderUtils;
 24  
 
 25  
 
 26  
 /**
 27  
  * A tag which can retrieve the value of a static field of a given class.
 28  
  * The following attributes are required:<br />
 29  
  * <ul>
 30  
  *   <li>var - The variable to which to assign the resulting value.</li>
 31  
  *   <li>field - The name of the static field to retrieve.</li>
 32  
  *   <li>className - The name of the class containing the static field.</li>
 33  
  * </ul>
 34  
  *
 35  
  * Example usage:
 36  
  * <pre>
 37  
  * &lt;j:getStatic var="closeOperation" className="javax.swing.JFrame"
 38  
  *              field="EXIT_ON_CLOSE"/&gt;
 39  
  * </pre>
 40  
  *
 41  
  * @version $Revision: 155420 $
 42  
  */
 43  
 
 44  26
 public class GetStaticTag extends TagSupport {
 45  
 
 46  
     /** The variable to which to assign the resulting value. */
 47  
     private String var;
 48  
 
 49  
     /** The name of the static field to retrieve. */
 50  
     private String field;
 51  
 
 52  
     /** The name of the class containing the static field. */
 53  
     private String className;
 54  
 
 55  
 
 56  
     /**
 57  
      * Sets the name of the variable exported by this tag.
 58  
      *
 59  
      * @param var The variable name.
 60  
      */
 61  
 
 62  
     public void setVar(String var) {
 63  26
         this.var = class="keyword">var;
 64  26
     }
 65  
 
 66  
 
 67  
     /**
 68  
      * Sets the name of the field to retrieve.
 69  
      *
 70  
      * @param method The method name
 71  
      */
 72  
 
 73  
     public void setField(String field) {
 74  26
         this.field = field;
 75  26
     }
 76  
 
 77  
 
 78  
     /**
 79  
      * Sets the fully qualified name of the class containing the static field.
 80  
      *
 81  
      * @param className The name of the class.
 82  
      */
 83  
 
 84  
     public void setClassName(String className) {
 85  26
         this.className = className;
 86  26
     }
 87  
 
 88  
 
 89  
     // Tag interface
 90  
     //------------------------------------------------------------------------
 91  
 
 92  
     public void doTag(XMLOutput output) throws JellyTagException {
 93  26
         String message = null;
 94  
 
 95  26
         if(var == null)
 96  0
             message = "var";
 97  26
         else if(field == null)
 98  0
             message = "field";
 99  26
         else if(className == null)
 100  0
             message = "className";
 101  
 
 102  26
         if(message != null)
 103  0
             throw new MissingAttributeException(message);
 104  
 
 105  
         try {
 106  26
             Class type     = ClassLoaderUtils.getClassLoader(getClass()).loadClass(className);
 107  26
             Object result  = type.getField(field).get(null);
 108  13
             JellyContext context = getContext();
 109  
 
 110  13
             context.setVariable(var, result);
 111  
 
 112  13
         } catch(Throwable t) {
 113  13
             throw
 114  
                 new JellyTagException("Could not access " + className + "." +
 115  
                                       var + ".  Original exception message: " +
 116  
                                       t.getMessage(), t);
 117  13
         }
 118  13
     }
 119  
 
 120  
 }
 121  
 
 122  
 
 123  
 /* Emacs configuration
 124  
  * Local variables:        **
 125  
  * mode:             java  **
 126  
  * c-basic-offset:   4     **
 127  
  * indent-tabs-mode: nil   **
 128  
  * End:                    **
 129  
  */

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