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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.Function;
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 Function annotations
19   *
20   * @see org.mule.expression.FunctionExpressionEvaluator
21   * @see org.mule.api.annotations.expressions.Function
22   *
23   * @since 3.0
24   */
25  public class FunctionAnnotationParser 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              return new ExpressionArgument(null, new ExpressionConfig(((Function) annotation).value(), evaluator.value(), null), false, parameterType);
33          }
34          else
35          {
36              throw new IllegalArgumentException("The @Evaluator annotation must be set on an Expression Annotation");
37          }
38      }
39  
40      public boolean supports(Annotation annotation)
41      {
42          return annotation instanceof Function;
43      }
44  }