Class CastExpressionCompiler


  • public class CastExpressionCompiler
    extends ToItemCompiler
    Generate code for a CastExpression
    • Constructor Detail

      • CastExpressionCompiler

        public CastExpressionCompiler()
    • Method Detail

      • compileToItem

        public void compileToItem​(CompilerService compiler,
                                  Expression expression)
                           throws CannotCompileException
        Generate bytecode to evaluate the CastExpression as an Item Precondition: none. Postcondition: the stack contains an Item representing the result of the expression
        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
      • compileToPrimitive

        public void compileToPrimitive​(CompilerService compiler,
                                       Expression expression,
                                       java.lang.Class requiredClass,
                                       OnEmpty onEmpty)
                                throws CannotCompileException
        Generate bytecode to evaluate the expression leaving a plain Java value on the stack. The static type of the expression must be such that the value is known to be representable by a value of the specified class; the cardinality must be either exactly-one or zero-or-one.
        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, CharSequence.class.
        onEmpty - action to be taken if the result of the expression is an empty sequence
        Throws:
        CannotCompileException - if the expression cannot be compiled to bytecode