SelectorFalseException

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com.presumo.jms.selector
Class SelectorFalseException

java.lang.Object
  java.lang.Throwable
      java.lang.Exception
          com.presumo.jms.selector.SelectorFalseException

All Implemented Interfaces:: java.io.Serializable

public final class SelectorFalseException
extends java.lang.Exception

JMS defines some conditions that will always render a selector false. One example is trying to add two strings. While the parser can detect errors in literals at parse time, it can not tell what type an identifier is until evaluation time. If an identifier type is incorrectly used JMS says that the selector is invalid. Another example would be referencing an object property from anywhere in the sql expression. The evaluate methods will throw this exception if they encounter a situation like the ones above. This will effectively short-circuit the evaluation. If you call evaluate on the node in the expression tree you must catch this exception. If it occurs you can assume the selector is false. If the selector does not throw an exception you still have to check the return type to see if the evaluation was true or false or unknown. (unknown == false).

Nested Class Summary

Nested classes inherited from class java.lang.Throwable

Field Summary

private static SelectorFalseException onlyInstance


Fields inherited from class java.lang.Exception

Fields inherited from class java.lang.Throwable

Constructor Summary

private SelectorFalseException()


Method Summary

(package private) static SelectorFalseException getInstance()


Methods inherited from class java.lang.Throwable

fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

onlyInstance

private static SelectorFalseException onlyInstance

Constructor Detail