org.exolab.jms.selector
Interface Expression

public interface Expression

This class is the base class for all expressions.

Version:

$Revision: 1.3 $ $Date: 2003/08/09 15:49:50 $

Author:

Tim Anderson

See Also:

Message, SObject, TypeMismatchException

Method Summary

org.exolab.jms.selector.SObject	evaluate(javax.jms.Message msg) Evaluate the expression
java.lang.String	toString() Return a string representation of this expression.

Method Detail

evaluate

public org.exolab.jms.selector.SObject evaluate(javax.jms.Message msg)
                                         throws TypeMismatchException

Evaluate the expression

Parameters:

msg - the message to use to obtain any header identifier and property values

Returns:

the evaluated result, or null if the value of the expression is unknown

Throws:

TypeMismatchException - if the expression tries to evaluate mismatched types.

toString

public java.lang.String toString()

Return a string representation of this expression. This should be compatible with the selector syntax.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of this expression