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