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 Details

  • Constructor Details

  • Method Details

    • 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 Class getCandidateArgClass(List<Constructor> candidates, int argIdx)
    • pruneCandidates

      public List<Constructor> pruneCandidates(List<Constructor> candidates, int argIdx, Class argClazz)
    • interpret

      public 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
    • compile

      public void compile(org.objectweb.asm.MethodVisitor mv, CompileContext compileContext) throws CompileException
      Specified by:
      compile in class RuleElement
      Throws:
      CompileException
    • getDescriptor

      private String getDescriptor()
    • writeTo

      public void writeTo(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 Class<?>[] createParamTypes(String descriptor, ClassLoader loader) throws TypeException
      Throws:
      TypeException