Class ErrorExpressionCompiler


  • public class ErrorExpressionCompiler
    extends ExpressionCompiler
    Generate bytecode for an error expression (an expression that throws a dynamic error if evaluated)
    • Constructor Detail

      • ErrorExpressionCompiler

        public ErrorExpressionCompiler()
    • Method Detail

      • compileToItem

        public void compileToItem​(CompilerService compiler,
                                  Expression expression)
                           throws CannotCompileException
        Generate bytecode to evaluate the expression as an Item Precondition: none. Postcondition: at execution time, the stack contains either an item (the result of the expression), or null (representing an empty sequence).
        Specified by:
        compileToItem in class ExpressionCompiler
        Parameters:
        compiler - the compiler service
        expression - the expression to be compiled
        Throws:
        CannotCompileException - if the expression cannot be compiled to bytecode
      • compileToBoolean

        public void compileToBoolean​(CompilerService compiler,
                                     Expression expression)
                              throws CannotCompileException
        Generate bytecode to evaluate the expression as a boolean Precondition: none. Postcondition: at execution time, the stack contains an integer (0=false, 1=true) representing the result of the expression
        Specified by:
        compileToBoolean in class ExpressionCompiler
        Parameters:
        compiler - the compiler service
        expression - the expression to be compiled
        Throws:
        CannotCompileException - if the expression cannot be compiled to bytecode
      • compileToPush

        public void compileToPush​(CompilerService compiler,
                                  Expression expression)
                           throws CannotCompileException
        Generate bytecode to evaluate the expression in push mode Precondition: none. Postcondition: at execution time, the stack is unchanged, and the value of the expression has been written to the current receiver
        Specified by:
        compileToPush in class ExpressionCompiler
        Parameters:
        compiler - the compiler service
        expression - the expression to be compiled
        Throws:
        CannotCompileException - if the expression cannot be compiled to bytecode
      • compileToPrimitive

        public void compileToPrimitive​(CompilerService compiler,
                                       Expression expression,
                                       java.lang.Class requiredClass,
                                       OnEmpty onEmpty)
                                throws CannotCompileException
        Generate bytecode to evaluate the expression as a String or other CharSequence. This method must be implemented for all expressions whose static type is xs:string or a type derived from xs:string Precondition: none. Postcondition: the stack contains a CharSequence value
        Overrides:
        compileToPrimitive in class ExpressionCompiler
        Parameters:
        compiler - the compiler service
        expression - the expression to be compiled
        requiredClass - the class of the Java value that is to be left on the stack if the generated code exits normally. This must be one of Integer.TYPE, Double.TYPE, Float.TYPE, BigDecimal.class, String.class, UnicodeString.class.
        onEmpty - defines the action to be taken if the expression evaluates to the empty sequence. May be null if the expression is known statically not to evaluate to an empty sequence. If the return class is a primitive type (double, float, etc) this must be an instance of OnEmpty.UnwindAndJump
        Throws:
        CannotCompileException - if the expression cannot be compiled to bytecode