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1   /*
2    * $Id: Expr.java 18452 2010-07-21 19:15:38Z aperepel $
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  
11  package org.mule.api.annotations.expressions;
12  
13  import org.mule.api.annotations.meta.Evaluator;
14  
15  import java.lang.annotation.Documented;
16  import java.lang.annotation.ElementType;
17  import java.lang.annotation.Retention;
18  import java.lang.annotation.RetentionPolicy;
19  import java.lang.annotation.Target;
20  
21  /**
22   * Allows method parameters to be configured with result of one or more Mule expressions
23   *
24   * public Object save(Object foo, @Expr("#[header:X-User]-#[function:UUID]") String id)
25   *
26   * @see org.mule.expression.FunctionExpressionEvaluator
27   */
28  @Target(ElementType.PARAMETER)
29  @Retention(RetentionPolicy.RUNTIME)
30  @Documented
31  @Evaluator("string")
32  public @interface Expr
33  {
34      String value();
35  
36      boolean optional() default false;
37  }