Class ThrowExpression


  • public class ThrowExpression
    extends Expression
    Expression which implements a throw from a rule action but only where the thrown exception is declared by the trigger method or is a runtime exception which does nto need ot be declared
    • Field Detail

      • typeName

        private java.lang.String typeName
      • arguments

        private java.util.List<Expression> arguments
      • argumentTypes

        private java.util.List<Type> argumentTypes
      • paramTypes

        private java.util.List<Type> paramTypes
      • constructor

        private java.lang.reflect.Constructor constructor
    • Constructor Detail

    • Method Detail

      • bind

        public void bind()
                  throws TypeException
        verify that variables mentioned in this expression are actually available in the supplied bindings list and infer/validate the type of this expression or its subexpressions where possible
        Specified by:
        bind in class Expression
        Throws:
        TypeException - if any variable is missing or has the wrong type
      • typeCheck

        public Type typeCheck​(Type expected)
                       throws TypeException
        ensure that all type references in the expression and its component expressions can be resolved, that the type of the expression is well-defined and that it is compatible with the type expected in the context in which it occurs.
        Specified by:
        typeCheck in class Expression
        Parameters:
        expected - the type expected for the expression in the contxt in which it occurs. this may be void but shoudl not be undefined at the point where type checking is performed.
        Returns:
        the expression type
        Throws:
        TypeException - if type checking fails
      • getCandidateArgClass

        public java.lang.Class getCandidateArgClass​(java.util.List<java.lang.reflect.Constructor> candidates,
                                                    int argIdx)
      • pruneCandidates

        public java.util.List<java.lang.reflect.Constructor> pruneCandidates​(java.util.List<java.lang.reflect.Constructor> candidates,
                                                                             int argIdx,
                                                                             java.lang.Class argClazz)
      • interpret

        public java.lang.Object interpret​(HelperAdapter helper)
                                   throws ExecuteException
        evaluate the expression by interpreting the expression tree
        Specified by:
        interpret in class Expression
        Parameters:
        helper - an execution context associated with the rule whcih contains a map of current bindings for rule variables and another map of their declared types both of which are indexed by varoable name. This includes entries for the helper (name "-1"), the recipient if the trigger method is not static (name "0") and the trigger method arguments (names "1", ...)
        Returns:
        the result of evaluation as an Object
        Throws:
        ExecuteException - if an error occurs during execution
      • getDescriptor

        private java.lang.String getDescriptor()
      • writeTo

        public void writeTo​(java.io.StringWriter stringWriter)
        Specified by:
        writeTo in class Expression
      • checkThrownTypeIsValid

        private void checkThrownTypeIsValid()
                                     throws TypeWarningException,
                                            TypeException
        check that it is legitimate to throw an exception of the type computed for this expression from the trtiggering method. if the computed type is a subtype of runtime exception then it is valid whatever the trigger method. if the computed type or one of its super types is declared by the trigger method as a checked exception then it is valid. if no such declaration is found then a typeexception is raised. However, in the case of an overriding rule whose target class includes a version of the method which does declares the exception a type warning exception is raised as this is not strictly an error. See issue BYTEMAN-156 for an explanation.
        Throws:
        TypeWarningException - if it is not legitimate to throw a value of the computed type from the trigger method but it is legitimate to throw a value of this type from the rule target method.
        TypeException - if it is otherwise not legitimate to throw a value of the computed type from the trigger method
      • createParamTypes

        public java.lang.Class<?>[] createParamTypes​(java.lang.String descriptor,
                                                     java.lang.ClassLoader loader)
                                              throws TypeException
        Throws:
        TypeException