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1   /*
2    * $Id: MuleAnnotationParser.java 20321 2010-11-24 15:21:24Z dfeist $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  package org.mule.config.expression;
11  
12  import org.mule.api.annotations.expressions.Mule;
13  import org.mule.api.annotations.meta.Evaluator;
14  import org.mule.api.expression.ExpressionAnnotationParser;
15  import org.mule.expression.ExpressionConfig;
16  import org.mule.expression.transformers.ExpressionArgument;
17  
18  import java.lang.annotation.Annotation;
19  
20  /**
21   * Used to parse Mule parameter annotations
22   *
23   * @see org.mule.expression.MuleExpressionEvaluator
24   * @see org.mule.api.annotations.expressions.Mule
25   *
26   * @since 3.0
27   */
28  public class MuleAnnotationParser implements ExpressionAnnotationParser
29  {
30      public ExpressionArgument parse(Annotation annotation, Class parameterType)
31      {
32          Evaluator evaluator = annotation.annotationType().getAnnotation(Evaluator.class);
33          if (evaluator != null)
34          {
35              Mule muleAnnotation = (Mule)annotation;
36              String val = muleAnnotation.value();
37  
38              if ("message.payload".equals(val))
39              {
40                  //Match the param type and attempt to auto convert
41                  val += "(" + parameterType.getName() + ")";
42              }
43  
44              return new ExpressionArgument(null, new ExpressionConfig(val, evaluator.value(), null),
45                      muleAnnotation.optional(), parameterType);
46          }
47          else
48          {
49              throw new IllegalArgumentException("The @Evaluator annotation must be set on an Expression Annotation");
50          }
51  
52      }
53  
54      public boolean supports(Annotation annotation)
55      {
56          return annotation instanceof Mule;
57      }
58  }