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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.Lookup;
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  import org.mule.util.StringUtils;
15  
16  import java.lang.annotation.Annotation;
17  
18  /**
19   * Used to parse Expr parameter annotations
20   *
21   * @see org.mule.expression.StringExpressionEvaluator
22   * @see org.mule.api.annotations.expressions.Expr
23   *
24   * @since 3.0
25   */
26  public class LookupAnnotationParser implements ExpressionAnnotationParser
27  {
28      public ExpressionArgument parse(Annotation annotation, Class<?> parameterType)
29      {
30          Evaluator evaluator = annotation.annotationType().getAnnotation(Evaluator.class);
31          if (evaluator != null)
32          {
33              String expression = ((Lookup) annotation).value();
34              if(StringUtils.isEmpty(expression))
35              {
36                  expression  = "type:" + parameterType.getName();
37              }
38              return new ExpressionArgument(null, new ExpressionConfig(expression,
39                      evaluator.value(), null), ((Lookup) annotation).optional(), parameterType);
40          }
41          else
42          {
43              throw new IllegalArgumentException("The @Evaluator annotation must be set on an Expression Annotation");
44          }
45  
46      }
47  
48      public boolean supports(Annotation annotation)
49      {
50          return annotation instanceof Lookup;
51      }
52  }