Expression


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46  package org.mr.api.jms.selector.syntax;
47  
48  import javax.jms.Message  ;
49  
50  
51  /**
52   * This class is the base class for all expressions.
53   * 
54   **/
55  public interface Expression {
56  
57      /**
58       * Evaluate the expression
59       *
60       * @param msg the message to use to obtain any header identifier and property values
61       * @return the evaluated result, or null if the value of the expression is unknown
62       * 
63       * @throws TypeMismatchException if the expression tries to evaluate mismatched types.
64       */
65      MantaObject evaluate(Message   msg) throws TypeMismatchException;
66  
67      /**
68       * Return a string representation of this expression. This should be compatible with the selector syntax.
69       *
70       * @return a string representation of this expression
71       */
72      String   toString();
73  }//Expression
74
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