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1   /*
2    * $Id: FunctionAnnotationParser.java 19191 2010-08-25 21:05:23Z tcarlson $
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.Function;
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 Function annotations
22   *
23   * @see org.mule.expression.FunctionExpressionEvaluator
24   * @see org.mule.api.annotations.expressions.Function
25   *
26   * @since 3.0
27   */
28  public class FunctionAnnotationParser 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              return new ExpressionArgument(null, new ExpressionConfig(((Function) annotation).value(), evaluator.value(), null), false, parameterType);
36          }
37          else
38          {
39              throw new IllegalArgumentException("The @Evaluator annotation must be set on an Expression Annotation");
40          }
41      }
42  
43      public boolean supports(Annotation annotation)
44      {
45          return annotation instanceof Function;
46      }
47  }