Coverage report

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org.apache.commons.jelly.tags.swt.GCTag
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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.swt;
 17  
 
 18  
 import org.apache.commons.jelly.JellyTagException;
 19  
 import org.apache.commons.jelly.TagSupport;
 20  
 import org.apache.commons.jelly.XMLOutput;
 21  
 import org.eclipse.swt.graphics.Drawable;
 22  
 import org.eclipse.swt.graphics.GC;
 23  
 
 24  
 /**
 25  
  * Class to create a {@link GC} instance within Jelly SWT.
 26  
  *
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  * @author <a href="mailto:crafterm@apache.org">Marcus Crafter</a>
 28  
  * @version CVS $Id: GCTag.java 155420 2005-02-26 13:06:03Z dirkv $
 29  
  */
 30  0
 public class GCTag extends TagSupport {
 31  
 
 32  
     /** Drawable name */
 33  
     private Drawable drawable;
 34  
 
 35  
     /** Variable name */
 36  
     private String var;
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 38  
     /**
 39  
      * Obtain the {@link Drawable} name for this {@link GC}.
 40  
      *
 41  
      * @return a {@link GC} {@link Drawable}
 42  
      */
 43  
     public Drawable getDrawable() {
 44  0
         return this.drawable;
 45  
     }
 46  
 
 47  
     /**
 48  
      * Set the {@link Drawable} name for this {@link GC}.
 49  
      *
 50  
      * @param drawable a {@link GC} {@link Drawable}
 51  
      */
 52  
     public void setDrawable(final Drawable drawable) {
 53  0
         this.drawable = drawable;
 54  0
     }
 55  
 
 56  
     /**
 57  
      * Sets the variable name.
 58  
      *
 59  
      * @param var the variable name of this {@link GC} instance
 60  
      */
 61  
     public void setVar(final String var) {
 62  0
         this.var = class="keyword">var;
 63  0
     }
 64  
 
 65  
     /**
 66  
      * Obtain the variable name.
 67  
      *
 68  
      * @return the variable name of this {@link GC} instance
 69  
      */
 70  
     public String getVar() {
 71  0
         return this.var;
 72  
     }
 73  
 
 74  
     // Tag interface
 75  
     //-------------------------------------------------------------------------
 76  
 
 77  
     /**
 78  
      * Creates a {@link GC} instance and stores it in the Context under a
 79  
      * particular variable name. Note, {@link GC} objects can only be created on
 80  
      * {@link Drawable} objects.
 81  
      *
 82  
      * @param output {@link XMLOutput} reference
 83  
      * @throws JellyTagException if an error occurs
 84  
      * @see org.apache.commons.jelly.Tag#doTag(org.apache.commons.jelly.XMLOutput)
 85  
      */
 86  
     public void doTag(final XMLOutput output) throws JellyTagException {
 87  
         // invoke by body just in case some nested tag configures me
 88  0
         invokeBody(output);
 89  
 
 90  0
         final boolean nullDrawable = drawable == null;
 91  0
         final boolean drawableParent = drawable instanceof Drawable;
 92  
 
 93  0
         if (nullDrawable || !drawableParent) {
 94  0
             throw new JellyTagException(
 95  
                 "This tag must specify a Drawable attribute (ie. Image or Control)"
 96  
             );
 97  
         }
 98  
 
 99  0
         if (var == null) {
 100  0
             throw new JellyTagException("This tag requires a context variable name");
 101  
         }
 102  
 
 103  
         // store the GC in the context
 104  0
         context.setVariable(var, new GC(drawable));
 105  0
     }
 106  
 }

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